Popular Circuits Page 90
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This circuit is IC controlled emergency light. This series of automatic switching-on of the light on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery supply to the....
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To quickly determine the remote control transmitter is good or bad, you can use the remote control detector as shown. If the detected remote control transmitter is good, it will instantly audible alarm signal. The detector can be used to detect various types....
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Output 12V-10A power circuit +12 V is the use of high-current switching power supply circuit consisting of L296, the output current up to 10 A. The entire circuit is small, seldom-used components...
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The battery low-voltage detector uses a CD4093 Schmitt trigger and a capacitor that acts as a 1-bit dynamic RAM. The c..
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This electronic circuit is a simple version of an electronic roulette game and is based on the 4017 IC which is a 10 stage decade counter/divider. It is driven by another versatile IC 555 configured as a voltage controlled oscillator (VCO). The 555 timer is....
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This circuit SP6691 has been designed to provide a high output voltage with a lower voltage boost Regulator by adding a charge pump circuit. This circuit CAN take a standard 30V boost Regulator and make it a 60V boost Regulator if needed. All of the testing....
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A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in Electronics Now. When the circuit detects that a phone line has been cut, it activates a MOSFET which can be used to....
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An LED is sure to fail if the current through it is too high. You will soon discover this after you have blown a few up. A simple resistor in series suffices to solve the problem and a better solution is almost inconceivable, because in this case you need....
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This stereo encoder is the perfect solution for those looking for a high quality stereo sound transmission at a low cost. This stereo encoder produces an excellent crystal clear stereo sound and very good channel separation that can match with many more....
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Diode VD2 ~ VD5, SCR vs consisting touch switch main circuit, R5 and VDI constitute a power supply circuit, the output of about 12V DC voltage of about, for manifold A electric..
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This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It`s certainly not the first wireless microphone we`ve ever published but this one is a little different. It`s stereo, providing....
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The circuit is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified fence generator. The p. r. f. (pulse repetition frequency) is determined by the time constant of network R1-C3 in the....
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This is a circuit of Closed-Loop Automatic Power Control for RF Applications. The circuit uses a log detector (AD8318) and a VGA (ADL5330). This circuit has a...
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The above circuit is fm receiver. when i used pin supply 9V, this circuit had quite nice performence. But when i used AC/DC rectifier or switch supply ....
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This 300W RF power amplifier for your fm transmitter has 2 x TP9383 transistors. 300W radio power amplifier for 88 - 108 MHz band. 300W RF power amplifier....
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This is a circuit that will go off if the circuit detects any sound above a certain threshold. Once the circuit detects sound, the alarm goes off alerting us to this sound. This circuit has extreme use when an area ordinarily should be very quiet and should....
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I2C are widely use for to communicate with external peripheral such as port expender, EEPROM, Real Time Clock etc. The Master Synchronous Serial Port (MSSP) module in PIC18 can be used to communicated with I2C peripheral. MSSP module can be configure to work....
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To be used with PC connected to video projectors, where the lighting controller may require control of a presentation on the video screen but the PC for the presentation is located in a different location to lighting control. The Hardware required for this....
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Not much can be said about how the LM382 works as most of the circuitry is contained within the IC. Most of the frequency-determining components are on the chip—only the capacitors are mounted externally..
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555 IC using a delay circuit of the four b They are a jump from high to low transition of the delay circuit. That button is pressed SB snow, the output is high, after some dela..
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Built quickly from the parts found on my home lab, seemed to work on short test with telephone line simulator and line connected to PBX, I have received a report that this circuit works well in Australia This circuit is a simple circuit which prevents....
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When this thermometer is used in the room, it can work in the intermittent way, and this working state can be kept in the temperature test circuit, because internal temperature doesn`t change sharply. The astable multi-resonance oscillator consists of VT1....
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The goal was to make a compass sensor compatible with the RCX and have it only take one sensor input port to take a compass reading. We decided to use a Dinsmore analog compass part that has two outputs that need to be combined to determine the direction the....
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The base of Ql is connected to the car"s ignition circuit. One side of the piezoelectric buzzer is connected to the instrument-panellight fuse. When the headlights are off,. no current reaches the buzzer, and therefore nothing happens. What happens when....
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The antenna coupling capacitor is a critical component in a regenerative receiver without an RF stage, like the Twinplex. In such a receiver, the antenna is an integral part of the regenerative detector, and for proper operation the coupling to the antenna....
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With Switch S1 you can change direction (Up/Down), Pot1 is for the clock speed and the Led D1 is only an indicator for the clock speed. ....
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This is a low voltage microphone preamplifier circuit with a 1. 5V power supply. The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100. Its output is fed through a gain-control potentiometer to the op amp, which is....
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A positive-going trigger pulse can be used to start the timing cycle with the circuit shown. In this design, trigger input pin 2 is biased to 6V (1/z Vvv) by divider Rl and R2. Control input pin 5 is biased to 8 V (213 Vvvl by the internal divider circuit.....
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Author Mazi Hosseini describes a simple, low-cost, voltage-controlled current source using two op amps that provides a good range of current and maximum load..
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This paper is a tutorial discussion of IF VCO design considerations. A Colpitts topology is analyzed and used to explore performance impacts....
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Simple FM transmitter with a single transistor. Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan`s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM....
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The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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The circuit is okay (not ideal for quality but it will work), but there`s one small issue if you want to feed the output to your Arduino. As shown, the output will swing below ground (i. e. it will be biased at 0V) and your Arduinos analog input will only....
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When ONLY VR will supply power to circuit, then MCU again will get power from +5V bus, but FTDI will ONLY get VCCIO. On middle of voltage divider R10/R11 I expect there will be 0 and MCU will not detect USB connection on (B). The question is - would it work....
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This classic tube amplifier used to be the best value on the block. Fifteen years ago you could buy one of these for $25. This amp was designed to be inexpensive and to get maximum performance for dollar paid. At the end of it`s sale it sold for about $100....
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This remote controller can be fitted to any preamplifier for distance volume control. Basicly, Its a motor controller circuit with IR that turn the potentiometer left or right...
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A microprocessor based project Microprocessor-Based Home Security System . This advance security system not only let you know but also alert police immediately. In the project 8085 microprocessor based home security system we can control siren, telephone....
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The schematic of the power supply is shown below. It runs off standard household power of 120VAC 50/60Hz, and the output is adjustable up to 25kV or more. For....
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How a cutt of a fader is differnet form a transform What does skratch tricks have to do with the fader function The cut on a fader is completely different from a transform. It isn`t an instant on/off but a sloped cut in perhaps anywhere from a few hundred....
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The internal zener on pin 15 of the 4046B supplies a stable voltage to the 3140IC op amp. This amplifier modulates the 4046B V..
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This is the door bell circuit with flashing LEDs to make the circuit more attractive. IC1 (NE555) is applied right here as being a clock generator. It is actually set up as an astable multivibrator whose frequency could be altered using the support of....
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It is based on the Miller solar engine and has no digital electronics involved. But before we get started, it must be said that a robot is defined as "a mechanical intelligent agent which can perform tasks on its own". Note that the definition does not state....
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The circuit in the diagram enables a negative voltage to be derived without the use of integrated circuits. Instead, it uses five n-p-n transistors that are driven by a 1 kHz (approx) TTL clock. When the clock input is high, transistors T1 and T2 link....
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This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set to any desired value....
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The input capacitor is for the low frequency cut-off and the standard value for the input capacitors is 0. 1uF ( the cut-off for this value is amount to 16Hz). ..
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Most of the strobocopes designed for commercial use (light effects, theatrical lighting, DJ-lights) have a external trigger connectors on the back of the strobocope. Those connectors trigger input are typically 6. 3 mm jacks or XLR connectors. Sometimes....
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Hardware design for USB is actually quite minimal, which is a big plus for us. However, what you quickly find out with USB is that the easy hardware design means the communication and control software is very complex, we`ll see more about that in the theory....
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This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver. An ICL8069 CCZR 1.2-V band-gap reference diode is used for a voltage reference. S2a-b-c select one of four ranges up to 200 V (maximum). The meter also has a....
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The IN914 (little glassy diode) and the zener diodes all have bands on the body which must be put in the direction shown on the drawing. The bands ar ` e at the K end of the diodes. A magnifying glass will help to locate the bands and also to check the....
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This metal detector using CS209A made by Cherry Semiconductor. The CS209A is a bipolar monolithic integrated circuit for use in metal detection / proximity sensing applications. The CS209A metal detector IC has two on-chip regulators current, the oscillator....
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18W Audio Amplifier made of transistors..
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Digital Command Control, for those who don`t know, offers many advantages over conventional DC analogue control systems. The main one being the simplicity of wiring. DCC allows one to control many locomotives individually on the layout without having to....
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A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by electric charging of....
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A solar charger circuit is used to charge lead acid batteries or Ni-Cd with solar power. Circuit harvests solar energy to charge a 6 volt battery 4. 5 Ah battery for various applications. The charger has voltage and current regulation and voltage cut-off....
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Electronics Tutorial about Mesh Current Analysis and Mesh Analysis Examples used to Analyse Complex Electrical Circuits in DC Theory....
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This circuit ensures that you will never again forget to switch on the lights of your car. As soon as the engine is running, the dipped beams and the sidelights are automatically switched on. The circuit also causes the dipped beams to be extinguished as....
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Circuit AD1865 is considered like best 18bit stereo audio DAC ever. I already built another DAC, that I will not say everything again. However I found, that current output is too weak and instead of using external I/V converter I used this, what is included....
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Two identical integrated circuits, U1 and U2, known as "hex inverters" are used for the theremin's primary functions. They are CMOS (Complimentary Symmetry Metal Oxide Semiconductor) devices, typically used in digital circuits to perform a logic function....
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Protect your LCD or Plasma TV with this tiny delay on circuit. The SMPS based power supply of these modern electronic devices is vulnerable to spikes in t...
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Can someone please help explain to me how this circuit works? I am pretty sure I understand how the voltage divider network works. I am pretty sure I....
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A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts....
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A Wien-Bridge oscillator circuit can be built from HA2541 and some basic components. This circuit can generate good-quality sine wave of 40 MHz with an upper limit of 50 MHz. The R3 through R7 and D2 and D1 provide the diode limiting for this circuit. Here....
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This project describes how to build a simple programmer for the Atmel ATmega8 single-chip microcontrollers. This should be considered a "hobby grade" programmer as it does not use a variable Vcc and uses the "Serial Programming Algorithm. " The ATmega8 can....
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In addition to providing an accurate input current limit, the LT1618 can also be used to provide a regulated output current for current-source applications. ..
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This nonisolated, unregulated, minimum component converter fills the void between low-power zener regulation and the higher power use of a 60-Hz input transformer. It is intended for use where)"er a nonisolated supply can be used safely. The circuit....
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A differential current sensing that is inserted inside a H bridge circuit. is shown in the schematic diagram below. This circuit is one example of AD8205 application. The AD8205 measures current in both directions as the motor changes direction and H-bridge....
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Stand-alone, 9V battery powered unit, Three-level input selector, three-band tone control This preamplifier was designed as a stand-alone portable unit, u....
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Instead of focusing on the mathematical and raw theoretical side of this simple pyro RF transmitter, we`ll be focusing on the elements in each of the stages. The math of how/why this circuit actually works is horridly ugly and way too complicated. so it`s....
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The back EMF voltage spikes produced by stepper motors (particularly higher voltage motors) can damage your PC`s printer port if connections are made incorrectly, flyback diodes are absent or connected in reverse, etc. The safest options are opto-isolated or....
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The three-tone electronic doorbell circuit consists of buttons Sl-S3, transistors Vl, V2, speaker BL, resistors Rl-R3, capacitors Cl, C2, diode VD and battery GB, and it is shown in Figure 3-109. Rl-R3 use the 1/4W carbon film resistors or metal film....
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Electronic temperature control circuit on an imported car air conditioners. Operational amplifier Ai, A2 using LM393. Adjustment potentiometer RP. Temperature range can be chan..
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Because of the high voltages found in a Charge & Primary sections it seems natural to look for cable with high voltage ratings, such as neon sign cable, medical X-ray equipment cable & car engine spark plug leads. The first two would be fine for connecting....
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The second half of the circuit is an inverting integrator. The first op-amp starts with its two inputs in an unknown state; let`s say it starts with + slightly higher than (which is at ground). The op-amp greatly amplifies this difference, bringing its....
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The lighting system of a motor vehicle consists of lighting and signalling devices mounted or integrated to the front, sides, rear, and in some cases the top of the vehicle. The purpose of this system is to provideilluminationfor the driver to operate the....
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An Oscillator circuit which can produce a good sine wave with a frequency of at least 500 Mhz. This is for RFID applications. I have tried to use an class E oscillator, but i cant seem to get the design right. Can anyone help me out..
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The Analog Interface Unit (AIU) is a simple circuit that connects to a PC parallel port, and allows you to sample and output 8-bit analog signals under software control...
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The objective of this project is to make a controller based model to count number of persons visiting particular room and accordingly light up the room. Here we can use sensor and can know present number of persons. In today`s world, there is a continuous....
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This page is browser friendly, by the way. Make your browser`s window less wide than your whole screen and you will find the narrower columns much easier to read. The page is in two parts. At the top, there`s a very basic program, showing you the RFID reader....
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This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
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The FET input amplifier has fixed bias with source feedback. This provides a very high input impedance with very low capacitance. The FET amplifier drives an emitter follower which, in spite of the fact that it has a low output impedance, feeds a transformer....
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Here is 3 band equalizer circuit other. A tone control circuit made with a single op-amp and having three ranges, bass, middle and treble controls. Using a...
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for the time in which it gets charged to 0. 6V, the other capacitor has already charged a whole lot(a value which I can`t figure out because the setup does not work until i reach one of the two states-Q1 is on or Q2 is on) The only reason the equation Tl=0.....
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The happy-birthday singer is a two bit wide by n words deep programable sequencer with 4 commands: reset to start vector (00), decrease frequency (01),increase frequency (10), and pause (11). The device starts out with a 2 word vector jump at the start of....
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This circuit is based around the PIC 16C84 (or PIC 16F84) microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on....
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Assuming I can get 5V in example after adjusting the pot in real use, will the 240 ohm resistor limit the current, or do I have to add something else on top of that afterwards If it does (I can have var. voltage + current limit) I assume I will need to up....