New Circuits Page 186
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This is a circuit for generating a sine wave from a single operational amplifier. The feedback loop of the op amp in this circuit (741) consists of a twin-T filter connected between its output and its inverting input. Positive feedback for oscillation is....
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The ISL6323 dual PWM controller delivers high efficiency and tight regulation from two synchronous buck DC/DC converters. The ISL6323 supports hybrid power control of AMD processors which operate from either a 6-bit parallel VID interface (PVI) or a serial....
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While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for cer....
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This simple circuit amplitude-modulates a single tone in such a manner to approximate the echo effect one might obtain, for instance, with sonar apparatus. Any reader who has been on a sonar-equipped vessel will realize that some imagination is required to....
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The Glolab ED4GP microprocessor based Encoder / Decoder is designed for use with wireless modules, infrared remote controls and other devices that operate with serial input and output data. It can be used as either an encoder or a decoder by simply....
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The circuit design employs a VHF amplifier adjusted in such a way that it will operate in the frequency range of 88 to 108 MHz, as part of the Band 2 Radi....
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Device such as burglar alarms and sirens, whose basic purpose is to monitor tested circuit diagram with description of burglar alarm alarm using dual operational amplifier...
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This astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet. Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply are....
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The reference chosen is an LM329 sub-surface (or buried) zener (ZD1). Whilst the circuit symbol is that of a zener, it`s actually an active device, which results in much lower dynamic impedance than a normal zener, of around 1ohm. It also has low noise....
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Turns on mobile transceiver or other mobile equipmentwhen powerisapplied, if external circuit is broken when equipment is stolen. Transmitter will then put unmodulated carrier on air even with PTT switch disconnected or off, for tracing with radio direction....
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This 3 band equalizer circuit is an active filter network for bass, mid and high audio ranges. It is designed around the LM833 opamp from National Semiconductors. The output of this 3 way graphic equalizer is designed to be DC coupled, however due to slight....
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Create a robotic team mascot for my team at work. My first, humble part of that project was to create a charger for the robot`s batteries. I wanted a battery charger that could charge the various NiMH battery packs that I have, ranging from 700 mAh to 2200....
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A 5V power supply using IC 7805 is designed and explained with a neat circuit diagram....
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It`s built on a breadboard and it sounds exactly how it should sound (damped sine wave, big 808/909-kind of kicks). However it`s noisy. I`ve tried adding a big electrolytic cap between V+ and GND. It makes difference yet it`s still very noisy. Also, the....
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Using LEDs as light sensors. A DDR pad. We designed our pad to have no moving parts. Instead, we chose to measure light reflectance off the user`s feet to determine if one of the arrows was being stepped on or not. Since a design with no moving parts offers....
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The job of this timer is to disconnect thecompressor circuit and connect a resistive heatingelement located near the evaporator atregular time intervals. The defrost heater is thermostaticallycontrolled and is used to melt any frostformation on the....
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Inverter of what this text produces see Fig. 1 Mainly by the MOS field effect tube, the ordinary power transformer forms. Its output power depends on the power of MOS field effect tube and power transformer, avoid the convoluted voltage transformer to wind,....
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I will share about the series used in the usb to charge battery. Issued voltage 4. 7 Volt to 5 Volt DC suitable for battery charge the phone, as well as other batteries. Below is a circuit where the voltage is removed the usb on the computer will be....
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Drive a four line LCD panel from an Arduino. The project started out as a way to drive the LCD to display arbitrary information, but then evolved into a way to tell the time, read and write the EEPROM from the Atmel 328p, and measure voltage. I`m using many....
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This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. Enter the four-digit code of your choice - and the relay will energize for the period of time set by C4 & R4. Use the relay contacts to power the....
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Operation of the circuit. Circuit is divided into three parts: low frequency production. The manufacturing high frequency and extension of production low...
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Aseries combination of 16 LEDs Gives a luminance (lux) equivalent of a 12W bulb. But if you have two series combinations of 23 LEDs in parallel (Total 46 LEDs), it Gives equal to a 35W light bulb. Diode D1 (1N4007) and capacitor C1 act as rectifying and....
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Because these transistors are a complementary pair, the circuit using them is very symmetrical. The upper right and upper left corners of the H-bridge are called "sources. " This name originates from their function which is to be a source of current for the....
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This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the necessity of coming back to switch-off the lights. Pushing on P1 allows C1 charging to full 12V....
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This opamp is available for only a few pounds. The AD8099 is a very fast opamp (1600 V/ms) and has high-impedance inputs with low input capacitance. The bandwidth of the opamp is so largethat at 100 MHz it still has a gain of nearly 40. This means that this....
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When the reverse voltage is applied that is say 10V to Source and the drain is grounded. So now the Vgs is -10V which is well above the threshold and is good enough to keep the MOS in saturation region. So it is conducting in the opposite direction also now.....
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This sound level meter circuit can be used to control the intensity of a sound recording or in a disco. It has 5 measurement domains between 70 and 120 dB;....
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the following circuit shows about Windspeed Indicator Circuit. Features: down to a constant 5 VDC by the LM7805 voltage regulator, 9 VDC supply ....
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The range of frequencies for the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second). Because the FM microphone has a variable tuned circuit, it can be tuned to a quiet spot on your local FM broadcast band for the best reception.....
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Description:The following circuit shows about Basic Monostable Multivibrator. This circuit based on the 555 Timer IC. Features: Pin 4 is the RESET, t=R1xC1, ....
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This circuit is an inverting amplifier with an output voltage swing from essentially 0 to +300 V. Any transistor can be used for Q1, provided that the breakdown voltage is greater than 300 V (because the full high voltage will be applied across Q1). Biasing....
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This circuit lets you control any line powered electrical device (a lamp, television, fan, etc. ) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With....
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This is a circuit for accelerometer amplifier. This is a simple circuit. Precision accelerometer needs inverting mode amplifier since they are usually charge-output devices. This amplifier is convert charges into voltage output. The circuit below is an....
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if your AC fan have 3 button (like i have), button 1 (for low speed), button 2 (half speed), and button 3 (high speed), you can use Relay for switch the speed changing that button. But if your AC fan have 3 button (like i have), button 1 (for low speed),....
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The output of this circuit is a current proportional to temperature, which can be used to drive a meter for a direct readout. Alternatively, a resistor or op amp can be used to get a voltage output. The circuit is pulsed at a low duty cycle to reduce power....
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Sound mixer circuit of Service This mixer is easy to implement and Expensive as it consists of 2 transistors And some simple resistors and capacito...
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The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the Mark 1 circuit and has increased range and sensitivity. It is also immune to the effects ofambient light, daylight and other forms of....
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The mobile robot should run under the unknown and uncertain environment, must possess autopilot and avoid hindering the function. The ultrasonic static is used as the range finding sensor of the mobile robot extensively with its characteristic simple, fast....
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Most all work off of some flip-flop like principle. And while I could have suggested a true flip-flop chip, I thought it would be cooler if you could use a 555 timer chip (which contains a single flip-flop and a couple of comparators). After scouring my....
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It is possible to apply switch-mode approaches to a silicon CMOS semiconductor process to fabricate a current-mode power amplifier with high gain and efficiency for use in 2. 4-GHz wireless applications. Amplification at 2. 4 GHz is necessary for a number of....
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Assume one of the transistor, say TR1 become conducting at first. Now, since TR1 is conducting, it`s collector emiter voltage should be ideally zero, but any way, it will be around 0. 1 volt and it`s base emiter voltage is +0. 6v. Now the capacitor c1 will....
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This is low voltage high-current ouput, switching dc power supplly wiht input 220 Volts AC, In this circuit, an St2 diac relaxation oscilator, Q3, C1, and the diac, initiates conduction of the output switching transistor Q1, the on time of which is....
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The LED Metronome is a modern interpretation of a classic device which is a staple of music teachers, students and composers everywhere. This circuit uses 12 LEDs to simulate the sweeping motion of the pendulum and a speaker with a simple amplifier to....
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This temperature controlled relay circuit is a simple yet highly accurate thermal control circuit which can be used in applications where automatic tempera...
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A few weeks ago, it came to my attention that IKEA do a set of colour-changeable LED strips. I ve been looking for a decent way of providing ....
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Here is a Hobby Circuit for electronics hobbyists that can switch on & off a light, Fan, Radio etc. by the sound of clap. The sound of clap is received by a small microphone that is shown biased by resistor R1 in the circuit. The microphone changes sound....
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The ISL6291 provides a low-cost integrated charger solution for single-cell Li-ion and Li Polymer rechargeable batteries. No external pass element, current sensing resistor, or reverse blocking diode is required with this solution. The ISL6291 is a....
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In some electronic projects you will need an unusual regulated voltage, unusual, because the voltage required is very small and you can not use zenner diodes or some other tricks due of a compact design. In that case you can use this voltage regulator....
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Amplifier circuit with MOSFET output stage, as a substitute for the output stage based on bipolar transistors. Advantages MOSFET Amplifier : simplicity of operation, hundreds of watts with a simple parallel, negative temperature coefficient and fast....
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This is a 22 Watt car stereo audio amplifier. The circuit is based by a single IC TDA1553 with a few peripheral components, this IC hope against hope code name your stereo car audio classification. The IC TDA1553CQ contains 2G—22 W amplifiers with....
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Have a water tank you want to measure or a dam or a gate Want to detect a car coming down the drive but don`t want to string wires through the garden This instructable shows how to send data 500 metres with 100% reliability using picaxe microcontroller chips....
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Most timer circuits. Often used with electrical transformers containing low as 9V and 12V, and use of electrical control relays.but the 1-15 minute timer....
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In industrial PLC applications, one of the old, but simpler methods of displaying numeric information is to use one or more 7-Segment numeric displays connected to an output card of a PLC. Although it is possible to build such a display yourself, it is far....
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One of the principal choices in phono preamplifier design is between active (feedback) and passive equalization. The ideal feedforward preamplifier for a moving magnet cartridge would have about 40dB gain prior to the equalizer (more for low-output moving....
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Many integrated circuits have undocumented features or abilities. This is one of them. The TLC555 output (pin 3) can sink a 100mA load to 1. 28V. The open drain transistor reset (pin 7) can sink 100mA to 1V. Tying both lines together is permissible because....
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This topic continues the coverage of audio tone controls. The first entry started with a Passive Tone Control circuit using different RC filter configurations and introduced an active filter. The second entry showed a fully designed 2-Band Active Tone....
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The minimum number of supporting components required to build a circuit using AT91SAM7S microcontrollers. This example uses the AT91SAM7S256 ARM7 microcontroller....
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Below is a Courtesy Light Extender for cars. When a door is closed in a car, it extends the ON time, so the passenger can see where he/she is sitting. Here is....
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Interfacing high power load can be done in many ways, such as using voltage divider resistors, transformer, or optocoupler. In the circuit shown below, an optocoupler method is presented. This optocoupler serve the logic level translation with flexible....
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Stepper motors, due to their unique design, can be controlled to a high degree of accuracy without any feedback mechanisms. The shaft of a stepper, mounted with a series of magnets, is controlled by a series of electromagnetic coils that are charged....
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Fires can occur for several reasons, for example, forgot to turn off equipment that could cause such as irons, fire alarm circuit with a temperature sensor may be one option in an effort to secure our homes from fire hazards. Actually there is also a fire....
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This is a new gear for Radio Direction Finding (RDF) known as FOX HUNT or called Transmitter Hunting (T-Hunting) or Treassure Hunting. HAM clubs, all over the world, are conducting this SCIENTIFIC GAME occasionally, being which is the only one interesting....
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ESP - The Audio Pages. Tips and techniques for passive crossover network design, including a design spreadsheet. Much more information than you are used to on this topic....
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This door minder electronic project is based on a 555 timer circuit and uses an IR beam to monitor door and passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic....
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The intersection of industry and data collecting system, hydrometeorologicalcontrol system, robot control system, digital image transmission system, etc. , it is due to the electron transport of the data information. We can say, the data information....
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Invert a signal to drive fets with hard/fast rise and fall times. I was told in another thread to use an inverter (NOT chip). This makes perfect sense to me since logic chips are always hard ON or OFF by design. But I`ve never worked with logic chips before.....
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The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated....
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12W Amplifier Circuit Using 741 Op Amp A 12 watt audio amplifier operating on a dual symmetrical supply of ± 12 volts. The 741 provides the....
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Please note that it is illegal to make a physical permanent connection to your telephone linein some countries (this includes the UK and Ireland). If building this circuit it is advisable touse a plugin cord so that the unit can be unplugged should a fault....
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This is true subwoofer circuit. This circuit is used for 15- to 18-inch woofers and will not work with 8- or 6- inch subwoofers. It has bass-reflex, a....
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The Lifetime Drive, later renamed the Universal Drive after issues regarding implied warranties, was produced by Miles Gordon Technology (MGT) in April 1989 as a floppy drive capable of connecting to most popular machines at the time. MGT was run by Alan....
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The moss-tiles belong to a series of RAD experiments in planting the ceiling for healthier and richer interiors. RAD recognizes the ceiling as an untapped site for interior landscapes. It is an undisturbed zone that can be reclaimed by nature and linked to....
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This LC meter circuit can measure coils and capacitors. When Lx or Cx is connected in the circuit the oscillator frequency will decrease and this decrease is measured by a frequency-voltage converter build with T3 and T4. To adjust this lc meter circuit with....
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This project describes an easy and inexpensive way of adding a digital thermometer and data logging feature to a PC. It involves a PIC microcontroller that gets the surrounding temperature information from the Microchip MCP9701 sensor, and sends it to a PC....
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The MICRF112 is a high performance, easy to use, single chip ASK / FSK Transmitter IC for remote Wireless applications in the 300 to 450MHz frequency band. This transmitter IC is a true daa-in, antenna-out onolithic device. MICRF112 is high performance in....
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The circuit protects a solid-state relay from overloads. The circuit limits current, automatically discon-nects the load after detecting a short circuit, and develops a fault-condition output signal. In normal operation, the controlling ptP sets the....
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The on thing every spy needs is a small and well concealed listening device. The FM Listening Bug Kit gives you all you need to build a small, single....
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How to create dual power supply unit using single battery for your lab prupose Dual voltage power supplies are required particularly for op amp experiments and some of the instrumentation amplifiers. Some low power audio pre amplifiers also uses dual voltage....
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Interactive voice response (IVR) system is a communication system which provides automated telephone call access to specified computer database information. Interactive Voice Response is a technology that allows computer to detect DTMF (Dual-tone....
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My Machtech tester is capable of metering the capacitors, but is very complicated to measure short lead capacitors, not speaking about SMD ones. Also, I needed to measure the coils. In I found some LC meter schematics. It was quite interesting and capable to....
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This simple amplifier does sound good quality Power output about 10 - 14 Watts with Supply voltage about 34 - 36 Volt DC. It requires a preamp in the function of it hasn`t got much advance. It requires cumbersome heat up sinks and a great transformer and a....
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The word "pentester" actually stands for penetration tester, people who tests security vulnerabi. Most of the high-end hotels around the world rely on keycard locks for the security of hotel rooms. However, these locks may not be so secure after all as a....
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4QD manufacture motor speed controllers so all our H bridges are PWM. Here`s a simple switch circuit for reversing and stopping a motor without any control of speed. Two inputs, A and B, control the bridge. With both high (or open circuit) both ends of the....
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Hi Dragon thank`s very much for your great info. I have rewatched all your video (or at least Lenz or Znel video) And i made a shematic how i see the....
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An interesting circuit of a true-portable and cute solid-state bright light built with LT1932. The light can be operated from two AA size dry/rechargeable pen-light cells. There is no housing included so that you can use your own imagination as to what you....
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Long range, very stable, harmonic free, FM transmitter circuit which can be used for FM frequencies between 88 and 108 MHz. With good antenna transmitter can cover 5km range. It has a very stable oscillator because it uses LM7809 voltage regulator which is a....
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Hi lads, I thought I`d start a thread on the diagrams I`m making. This first set is for DOSD. After a potential problem was discovered recently these new diagrams will enable you to wire up the DOSD perfectly safely avoiding the potential problem. Click on....
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This circuit will let you know when something that should be kept closed - has in fact been left open. Attach it to a Fire-Door. It will allow you to pass through the door as usual. However, if it`s left open for more than 30-seconds or so - the buzzer will....
This is a circuit for generating a sine wave from a single operational amplifier. The feedback loop of the op amp in this circuit (741) consists of a twin-T filter connected between its output and its inverting input. Positive feedback for oscillation is....
The ISL6323 dual PWM controller delivers high efficiency and tight regulation from two synchronous buck DC/DC converters. The ISL6323 supports hybrid power control of AMD processors which operate from either a 6-bit parallel VID interface (PVI) or a serial....
While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for cer....
This simple circuit amplitude-modulates a single tone in such a manner to approximate the echo effect one might obtain, for instance, with sonar apparatus. Any reader who has been on a sonar-equipped vessel will realize that some imagination is required to....
The Glolab ED4GP microprocessor based Encoder / Decoder is designed for use with wireless modules, infrared remote controls and other devices that operate with serial input and output data. It can be used as either an encoder or a decoder by simply....
The circuit design employs a VHF amplifier adjusted in such a way that it will operate in the frequency range of 88 to 108 MHz, as part of the Band 2 Radi....
Device such as burglar alarms and sirens, whose basic purpose is to monitor tested circuit diagram with description of burglar alarm alarm using dual operational amplifier...
This astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet. Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply are....
The reference chosen is an LM329 sub-surface (or buried) zener (ZD1). Whilst the circuit symbol is that of a zener, it`s actually an active device, which results in much lower dynamic impedance than a normal zener, of around 1ohm. It also has low noise....
Turns on mobile transceiver or other mobile equipmentwhen powerisapplied, if external circuit is broken when equipment is stolen. Transmitter will then put unmodulated carrier on air even with PTT switch disconnected or off, for tracing with radio direction....
This 3 band equalizer circuit is an active filter network for bass, mid and high audio ranges. It is designed around the LM833 opamp from National Semiconductors. The output of this 3 way graphic equalizer is designed to be DC coupled, however due to slight....
Create a robotic team mascot for my team at work. My first, humble part of that project was to create a charger for the robot`s batteries. I wanted a battery charger that could charge the various NiMH battery packs that I have, ranging from 700 mAh to 2200....
A 5V power supply using IC 7805 is designed and explained with a neat circuit diagram....
It`s built on a breadboard and it sounds exactly how it should sound (damped sine wave, big 808/909-kind of kicks). However it`s noisy. I`ve tried adding a big electrolytic cap between V+ and GND. It makes difference yet it`s still very noisy. Also, the....
Using LEDs as light sensors. A DDR pad. We designed our pad to have no moving parts. Instead, we chose to measure light reflectance off the user`s feet to determine if one of the arrows was being stepped on or not. Since a design with no moving parts offers....
The job of this timer is to disconnect thecompressor circuit and connect a resistive heatingelement located near the evaporator atregular time intervals. The defrost heater is thermostaticallycontrolled and is used to melt any frostformation on the....
Inverter of what this text produces see Fig. 1 Mainly by the MOS field effect tube, the ordinary power transformer forms. Its output power depends on the power of MOS field effect tube and power transformer, avoid the convoluted voltage transformer to wind,....
I will share about the series used in the usb to charge battery. Issued voltage 4. 7 Volt to 5 Volt DC suitable for battery charge the phone, as well as other batteries. Below is a circuit where the voltage is removed the usb on the computer will be....
Drive a four line LCD panel from an Arduino. The project started out as a way to drive the LCD to display arbitrary information, but then evolved into a way to tell the time, read and write the EEPROM from the Atmel 328p, and measure voltage. I`m using many....
This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. Enter the four-digit code of your choice - and the relay will energize for the period of time set by C4 & R4. Use the relay contacts to power the....
Operation of the circuit. Circuit is divided into three parts: low frequency production. The manufacturing high frequency and extension of production low...
Aseries combination of 16 LEDs Gives a luminance (lux) equivalent of a 12W bulb. But if you have two series combinations of 23 LEDs in parallel (Total 46 LEDs), it Gives equal to a 35W light bulb. Diode D1 (1N4007) and capacitor C1 act as rectifying and....
Because these transistors are a complementary pair, the circuit using them is very symmetrical. The upper right and upper left corners of the H-bridge are called "sources. " This name originates from their function which is to be a source of current for the....
This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the necessity of coming back to switch-off the lights. Pushing on P1 allows C1 charging to full 12V....
This opamp is available for only a few pounds. The AD8099 is a very fast opamp (1600 V/ms) and has high-impedance inputs with low input capacitance. The bandwidth of the opamp is so largethat at 100 MHz it still has a gain of nearly 40. This means that this....
When the reverse voltage is applied that is say 10V to Source and the drain is grounded. So now the Vgs is -10V which is well above the threshold and is good enough to keep the MOS in saturation region. So it is conducting in the opposite direction also now.....
This sound level meter circuit can be used to control the intensity of a sound recording or in a disco. It has 5 measurement domains between 70 and 120 dB;....
the following circuit shows about Windspeed Indicator Circuit. Features: down to a constant 5 VDC by the LM7805 voltage regulator, 9 VDC supply ....
The range of frequencies for the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second). Because the FM microphone has a variable tuned circuit, it can be tuned to a quiet spot on your local FM broadcast band for the best reception.....
Description:The following circuit shows about Basic Monostable Multivibrator. This circuit based on the 555 Timer IC. Features: Pin 4 is the RESET, t=R1xC1, ....
This circuit is an inverting amplifier with an output voltage swing from essentially 0 to +300 V. Any transistor can be used for Q1, provided that the breakdown voltage is greater than 300 V (because the full high voltage will be applied across Q1). Biasing....
This circuit lets you control any line powered electrical device (a lamp, television, fan, etc. ) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With....
This is a circuit for accelerometer amplifier. This is a simple circuit. Precision accelerometer needs inverting mode amplifier since they are usually charge-output devices. This amplifier is convert charges into voltage output. The circuit below is an....
if your AC fan have 3 button (like i have), button 1 (for low speed), button 2 (half speed), and button 3 (high speed), you can use Relay for switch the speed changing that button. But if your AC fan have 3 button (like i have), button 1 (for low speed),....
The output of this circuit is a current proportional to temperature, which can be used to drive a meter for a direct readout. Alternatively, a resistor or op amp can be used to get a voltage output. The circuit is pulsed at a low duty cycle to reduce power....
Sound mixer circuit of Service This mixer is easy to implement and Expensive as it consists of 2 transistors And some simple resistors and capacito...
The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the Mark 1 circuit and has increased range and sensitivity. It is also immune to the effects ofambient light, daylight and other forms of....
The mobile robot should run under the unknown and uncertain environment, must possess autopilot and avoid hindering the function. The ultrasonic static is used as the range finding sensor of the mobile robot extensively with its characteristic simple, fast....
Most all work off of some flip-flop like principle. And while I could have suggested a true flip-flop chip, I thought it would be cooler if you could use a 555 timer chip (which contains a single flip-flop and a couple of comparators). After scouring my....
It is possible to apply switch-mode approaches to a silicon CMOS semiconductor process to fabricate a current-mode power amplifier with high gain and efficiency for use in 2. 4-GHz wireless applications. Amplification at 2. 4 GHz is necessary for a number of....
Assume one of the transistor, say TR1 become conducting at first. Now, since TR1 is conducting, it`s collector emiter voltage should be ideally zero, but any way, it will be around 0. 1 volt and it`s base emiter voltage is +0. 6v. Now the capacitor c1 will....
This is low voltage high-current ouput, switching dc power supplly wiht input 220 Volts AC, In this circuit, an St2 diac relaxation oscilator, Q3, C1, and the diac, initiates conduction of the output switching transistor Q1, the on time of which is....
The LED Metronome is a modern interpretation of a classic device which is a staple of music teachers, students and composers everywhere. This circuit uses 12 LEDs to simulate the sweeping motion of the pendulum and a speaker with a simple amplifier to....
This temperature controlled relay circuit is a simple yet highly accurate thermal control circuit which can be used in applications where automatic tempera...
A few weeks ago, it came to my attention that IKEA do a set of colour-changeable LED strips. I ve been looking for a decent way of providing ....
Here is a Hobby Circuit for electronics hobbyists that can switch on & off a light, Fan, Radio etc. by the sound of clap. The sound of clap is received by a small microphone that is shown biased by resistor R1 in the circuit. The microphone changes sound....
The ISL6291 provides a low-cost integrated charger solution for single-cell Li-ion and Li Polymer rechargeable batteries. No external pass element, current sensing resistor, or reverse blocking diode is required with this solution. The ISL6291 is a....
In some electronic projects you will need an unusual regulated voltage, unusual, because the voltage required is very small and you can not use zenner diodes or some other tricks due of a compact design. In that case you can use this voltage regulator....
Amplifier circuit with MOSFET output stage, as a substitute for the output stage based on bipolar transistors. Advantages MOSFET Amplifier : simplicity of operation, hundreds of watts with a simple parallel, negative temperature coefficient and fast....
This is a 22 Watt car stereo audio amplifier. The circuit is based by a single IC TDA1553 with a few peripheral components, this IC hope against hope code name your stereo car audio classification. The IC TDA1553CQ contains 2G—22 W amplifiers with....
Have a water tank you want to measure or a dam or a gate Want to detect a car coming down the drive but don`t want to string wires through the garden This instructable shows how to send data 500 metres with 100% reliability using picaxe microcontroller chips....
Most timer circuits. Often used with electrical transformers containing low as 9V and 12V, and use of electrical control relays.but the 1-15 minute timer....
In industrial PLC applications, one of the old, but simpler methods of displaying numeric information is to use one or more 7-Segment numeric displays connected to an output card of a PLC. Although it is possible to build such a display yourself, it is far....
One of the principal choices in phono preamplifier design is between active (feedback) and passive equalization. The ideal feedforward preamplifier for a moving magnet cartridge would have about 40dB gain prior to the equalizer (more for low-output moving....
Many integrated circuits have undocumented features or abilities. This is one of them. The TLC555 output (pin 3) can sink a 100mA load to 1. 28V. The open drain transistor reset (pin 7) can sink 100mA to 1V. Tying both lines together is permissible because....
This topic continues the coverage of audio tone controls. The first entry started with a Passive Tone Control circuit using different RC filter configurations and introduced an active filter. The second entry showed a fully designed 2-Band Active Tone....
The minimum number of supporting components required to build a circuit using AT91SAM7S microcontrollers. This example uses the AT91SAM7S256 ARM7 microcontroller....
Below is a Courtesy Light Extender for cars. When a door is closed in a car, it extends the ON time, so the passenger can see where he/she is sitting. Here is....
Interfacing high power load can be done in many ways, such as using voltage divider resistors, transformer, or optocoupler. In the circuit shown below, an optocoupler method is presented. This optocoupler serve the logic level translation with flexible....
Stepper motors, due to their unique design, can be controlled to a high degree of accuracy without any feedback mechanisms. The shaft of a stepper, mounted with a series of magnets, is controlled by a series of electromagnetic coils that are charged....
Fires can occur for several reasons, for example, forgot to turn off equipment that could cause such as irons, fire alarm circuit with a temperature sensor may be one option in an effort to secure our homes from fire hazards. Actually there is also a fire....
This is a new gear for Radio Direction Finding (RDF) known as FOX HUNT or called Transmitter Hunting (T-Hunting) or Treassure Hunting. HAM clubs, all over the world, are conducting this SCIENTIFIC GAME occasionally, being which is the only one interesting....
ESP - The Audio Pages. Tips and techniques for passive crossover network design, including a design spreadsheet. Much more information than you are used to on this topic....
This door minder electronic project is based on a 555 timer circuit and uses an IR beam to monitor door and passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic....
The intersection of industry and data collecting system, hydrometeorologicalcontrol system, robot control system, digital image transmission system, etc. , it is due to the electron transport of the data information. We can say, the data information....
Invert a signal to drive fets with hard/fast rise and fall times. I was told in another thread to use an inverter (NOT chip). This makes perfect sense to me since logic chips are always hard ON or OFF by design. But I`ve never worked with logic chips before.....
The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated....
12W Amplifier Circuit Using 741 Op Amp A 12 watt audio amplifier operating on a dual symmetrical supply of ± 12 volts. The 741 provides the....
Please note that it is illegal to make a physical permanent connection to your telephone linein some countries (this includes the UK and Ireland). If building this circuit it is advisable touse a plugin cord so that the unit can be unplugged should a fault....
This is true subwoofer circuit. This circuit is used for 15- to 18-inch woofers and will not work with 8- or 6- inch subwoofers. It has bass-reflex, a....
The Lifetime Drive, later renamed the Universal Drive after issues regarding implied warranties, was produced by Miles Gordon Technology (MGT) in April 1989 as a floppy drive capable of connecting to most popular machines at the time. MGT was run by Alan....
The moss-tiles belong to a series of RAD experiments in planting the ceiling for healthier and richer interiors. RAD recognizes the ceiling as an untapped site for interior landscapes. It is an undisturbed zone that can be reclaimed by nature and linked to....
This LC meter circuit can measure coils and capacitors. When Lx or Cx is connected in the circuit the oscillator frequency will decrease and this decrease is measured by a frequency-voltage converter build with T3 and T4. To adjust this lc meter circuit with....
This project describes an easy and inexpensive way of adding a digital thermometer and data logging feature to a PC. It involves a PIC microcontroller that gets the surrounding temperature information from the Microchip MCP9701 sensor, and sends it to a PC....
The MICRF112 is a high performance, easy to use, single chip ASK / FSK Transmitter IC for remote Wireless applications in the 300 to 450MHz frequency band. This transmitter IC is a true daa-in, antenna-out onolithic device. MICRF112 is high performance in....
The circuit protects a solid-state relay from overloads. The circuit limits current, automatically discon-nects the load after detecting a short circuit, and develops a fault-condition output signal. In normal operation, the controlling ptP sets the....
The on thing every spy needs is a small and well concealed listening device. The FM Listening Bug Kit gives you all you need to build a small, single....
How to create dual power supply unit using single battery for your lab prupose Dual voltage power supplies are required particularly for op amp experiments and some of the instrumentation amplifiers. Some low power audio pre amplifiers also uses dual voltage....
Interactive voice response (IVR) system is a communication system which provides automated telephone call access to specified computer database information. Interactive Voice Response is a technology that allows computer to detect DTMF (Dual-tone....
My Machtech tester is capable of metering the capacitors, but is very complicated to measure short lead capacitors, not speaking about SMD ones. Also, I needed to measure the coils. In I found some LC meter schematics. It was quite interesting and capable to....
This simple amplifier does sound good quality Power output about 10 - 14 Watts with Supply voltage about 34 - 36 Volt DC. It requires a preamp in the function of it hasn`t got much advance. It requires cumbersome heat up sinks and a great transformer and a....
The word "pentester" actually stands for penetration tester, people who tests security vulnerabi. Most of the high-end hotels around the world rely on keycard locks for the security of hotel rooms. However, these locks may not be so secure after all as a....
4QD manufacture motor speed controllers so all our H bridges are PWM. Here`s a simple switch circuit for reversing and stopping a motor without any control of speed. Two inputs, A and B, control the bridge. With both high (or open circuit) both ends of the....
Hi Dragon thank`s very much for your great info. I have rewatched all your video (or at least Lenz or Znel video) And i made a shematic how i see the....
An interesting circuit of a true-portable and cute solid-state bright light built with LT1932. The light can be operated from two AA size dry/rechargeable pen-light cells. There is no housing included so that you can use your own imagination as to what you....
Long range, very stable, harmonic free, FM transmitter circuit which can be used for FM frequencies between 88 and 108 MHz. With good antenna transmitter can cover 5km range. It has a very stable oscillator because it uses LM7809 voltage regulator which is a....
Hi lads, I thought I`d start a thread on the diagrams I`m making. This first set is for DOSD. After a potential problem was discovered recently these new diagrams will enable you to wire up the DOSD perfectly safely avoiding the potential problem. Click on....
This circuit will let you know when something that should be kept closed - has in fact been left open. Attach it to a Fire-Door. It will allow you to pass through the door as usual. However, if it`s left open for more than 30-seconds or so - the buzzer will....
