Popular Circuits Page 28
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Using this simple Christmas LED lights decoration circuit, you can make an 18 LED flasher to decorate the Christmas Tree. The White, Blue and Red LEDs flas....
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The charger is build around a LM317 (click to download datasheet) adjustable regulator.
The charge starts when a battery is connected between pins JP1-JP4 or JP2-JP4 or JP3-JP4. For example, if a battery is connected to JP1-JP4 pins then the current that....
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Mixed Analog/Digital Design Using Split Power, Ground Planes The next example shows how to design a circuit with a mixture of analog and digital parts with multiple power planes and with a single ground plane split into analog and digital sections that have....
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In many oscilloscopes, the most sensitive range is 2 to 5 mV, although it is often possible to improve this to 1 to 2 m..
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Schematics circuits for guitar effects with vacuum tubes and solid state electronics. DOD R825 Compressor. DOD 908 Digital Delay. MXR Dynacomp Compressor. Fuzzface Free Electronic Circuits, Diagrams, Schematics and Projects. BBE Opto Stomp Optical Compressor....
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An Autodyne circuit combines three functions normally found in different stages in an RF Receiver into a single circuit. However the three stages which are the RF amplifier, the Mixer and the Local Oscillator are normally found concatenated together.....
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The music equalizer display schematic is not a very difficult one to build. I managed to fit it all on a nice little breadboard. You will need all the parts listed out on the previous page to put it together. It is quite wire-intensive so make sure you have....
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This is one of mine projects which can be helpful for controlling water level in water tank. I made it on one of Atarado SMART prototyping PCB for which I can tell all the best. Controller for water tank managing water pump and take care of water level. This....
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The following circuit shows about A Simple and Cheap Dark-Detecting LED Circuit. Features: Photoresistors are reliable, photocell or LDR, LED ....
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This is a battery charger circuit, this circuit has advantages, which can cut off electrical charging of the battery automatically. Voltage sensor used in this circuit is the LM301 IC2. This sensor serves to disconnect the battery if the charging voltage has....
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This video demonstrates how to bring up multiple instances of QsoNet`s Dahdidah Cw Software Keyer using FABULATECH`s VIRTUAL SERIAL PORT SPLITTER. Four separa....
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This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good. All general....
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HA-5190 is rated for ±5 V output swing, and saturates at ±7 V. As with most op amps, recovery from output saturation is slow compared to the amplifier"s normal response time. Some form of limiting, either of the input signal or in the feedback path,....
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I first tried a lot of different circuit combinations with alligator clips and different interactions with code. For example, I could have them turn on individually and sequentially (A, B, C) or have them turn on sequentially but stay lit (A, AB, ABC). I....
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I have put all the components on the PCB, now i dont know anything about relays, so i`m having trouble connecting the power and the load?....
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This Wien bridge oscillator uses incandescent lamp to stabilize its amplitude. This amplitude stabilization gives a low distortion output. Multiple frequency....
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The alarm circuit has a single 555 oscillator/timer (Ul) performing double duty; serving both in the alarm-trigger circuit arid the entry- delay circuit. In this application, the trigger input of IJ1 at pin 2 is held high via Rl. A normally-closed sensor....
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This transmitter is very stable and will deliver up to seven watts of power with the components and tubes shown. Do not be put-off by valves as they are VERY easy to work with and it seems that there are quite a few valves around. Because no-one wants these....
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Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self stabilizing and will set its....
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A 8051 microcontroller based electronics project. This demo project explains how to make a car parking system automated. Here, there is a multi floor parking system, and a lift will take your car to the appropriate parking area depending on the cars that are....
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The goal of this project was to build a circuit that would monitor a person`s sleep activity and, eventually, give feedback on that activity to the user. The purpose of this was to induce lucid dreaming in the subject. When sleeping, people generally....
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Today`s electronic systems are in a continuing, evolving design cycle where more smaller, and hotter components are being crammed into tight enclosures. These expensive systems need to remain dependable and reliable. A fan failure may result in other....
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Just like my previous circuit using LM358 this is also very cheap, also under 100 rupees. This is a circuit for controlling the street lights, garden lights, automatically. You don`t need to turn it on and turn it off again and again, just turn on the....
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Today, simplicity and minimum controls is required for design of a handheld device. It will be very useful if a circuit allow us to turn the power on or of....
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3-wire door locks can be either positive (diagram below), or negative. There is either a constant ground or positive wire that makes contact with either the lock or unlock wire when the switch is pushed. The idea here is to add relays that will make the....
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The schematic is very simple and includes, in addition to Nutchip, with its three driving transistor and LED, the radio receiver. The data come from the OUT pin of the receiver and enter the pin REMOTE remote control. The RESET pin connected to an external....
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I have received countless emails asking for a circuit to tell the user which car won in a pine car (also called Pinewood Derby, Cub Car, Scout Car, etc.) race. This simple circuit takes care of the guesswork, lighting the appropriate LED to indicate the....
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This entry is a 4 step sequencer controlling an `Atari Punk` synth with a greyscale NTSC video visualization of the output audio, built using two 558 quad-timers and two 556 dual-timers. Sorry in advance for the poor video quality, I will try to get a direct....
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This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation from the mains so that low-voltage (12V) cabling could be run to the alarm circuit which is....
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I have looked in all the usual places and can`t seem to find one? Pilot 505. It has a 5AR 4,-4-,EL84`s-and 2, 12AX7`s. Thanks for any help you may....
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This circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Q3, VC1,....
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Sometimes called the JFET µ-amp, this circuit provides a very low power, high gain amplifying function. Since µ of a JFET increases as drain current decreases, the lower drain current is, the more gain you get..
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This LED flasher circuit is a classic two transistor flip flop. This flasher circuit is very popular and it`s usually the first circuit to build when starting electronic circuit building hobby. Here is the schematic diagram of the famous LED flasher circuit:....
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I am using the UCD90124/A, among other things, to monitor multiple voltages. Several of these are > 2. 5v so I have scaling circuits so as not to violate the 2. 5v max on the Mon inputs. My question is, do I enter the raw voltage values in Fusion for such....
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Charging time relay circuit 2 It is a long delay circuit. When the capacitor C is 5000yF, the delay can be up to 1. 3h. By transistors VTi and regulator VS2, VS3 group as a con..
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Connect the components. Take note of the connections for the transistor. Connect the 22 ohm load resistor and thermistor in a way that they make good thermal contact. Note: If you are using the Light Application Adaptor, REFIN- is already connected to AGND.....
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Using BA1404 can be designed a very simple and useful fm stereo modulator electronic project. This BA1404 fm stereo modulator device works in FM broadcast band ( 75- 108MHz) and require few external common components. The BA1404 fm stereo modulator Ic....
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Circuit Fear not, dear reader - I haven`t given up the sauce. I am not in withdrawal, suffering severe autonomic instability. I refer not to Delirium Tremens, but to time differences, dt. Specifically to the "DT" data column in the WSPR GUI. Everything was....
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This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown here will event....
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The following diagram is the schematic of simple easily tuned / adjustable sine and square wave oscillator. This circuit provides sine and square wave at frequency of below 20Hz up to above 20KHz. The benefit of this circuit diagram is that....
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This circuit illustrates some possible buffer combinations. Tbese include a differential input stage, a voltage follower as well as both noninverting and inverting stages. The allowable resistor ratios and recommended device types are also included. One....
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Some 20 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. These devices contained a special purpose IC and therefore were not suited to home construction. The present circuit is....
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Here is a very simple wind meter (anemometer) circuit. I can`t guarantee much on the accuracy of this circuit but it circuit works quite fine. You can measure wind speeds up to 75m/s using this circuit. The transistors Q1 and Q2 are used for sensing the....
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The supply voltage should be about +/- 35 Volts at full load, which will let this little guy provide a maximum of 56 Watts (rated minimum output at 25 degrees C). To enable maximum power, it is important to get the lowest possible case to heatsink thermal....
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This application note describes a low-cost circuit that can detect when a chassis fan filter has become clogged
with dust. It does this by using a temperature sensor to determine the rate of cooling of a transistor in the air
path of the cooling fan,....
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For systems with only one power supply, two op amps act as instrumentation and buffer amps. The OPA111..
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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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The Hex switches are connected to J2 as follows: pin 1=common of both switches (+5V) 2=LSB up to 5=MSB of first switch. Then 6=LSB of second switch up to 9 which is MSB. I modified the oscillator slightly to get my cheap Farnell crystal to start reliably....
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This unit is designed to interface: TV sound, videotape sound, and 5.1 dvd sound to a 4 channel home theater system. It provides the following functions/options. Mix DVD center into front left/right for Phantom Center effect with optional boost on center....
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The diagram below shows video line driver typical operating circuit for the IC4030/4031 schematic. It uses the MAX4030E/MAX4031E with such unity-gain stable op amps combine high-speed performance, rail-to-rail outputs, and 15kV ESD protection, according to....
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This page describes a modification that you plug in to your radio and computer. Do this at your own risk! It`s your choice to do this. I`m not forcing it on you. If you don`t, hey, no hard feelings, but if you do and mess something up, don`t blame me. This....
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The Flip-Flop Robot drives forward until it hits an obstacle, and then reverses until it hits another obstacle. This back-and-forth process continues indefinitely. By limiting the functionality to this very rudimentary behavior, it can be generated from an....
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This infrared detector circuit is designed using the PID20 integrated circuit manufactured by Siemens (which converts thermal radiation into electrical impulses), an operational amplifier and a few electronic components. The output signal at pin 3 is....
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The following method allows the timer to be triggered by a normally closed switch. This would be useful in applications such as intrusion alarms where the protection circuit is broken if a window or door is opened Trigger Input Control Of 555 Timers ..
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The SCHAER+ programmer is a programmer for PIC18 family from a PC parallel port (LPT). It is derivated from the SCHAER programmer I used to download my projects in PIC1684. The SCHAER+ programmer should be improved to use a USB connection, without any....
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As you see in the circuit above the four pins "Controller pin 1", 2, 3 and 4 will control the motion and direction of the stepper motor according to the step sequece programmed in the controller. As already discussed in case of L293D, Here in this circuit....
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This is a square wave generator circuit. The main component of this circuit is the 741, a general-purpose operational amplifier. This circuit employs a single power supply Vs that can range from +5V to +15V. The square wave output of this circuit is easy to....
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This circuit responds to RF signals from below the standard broadcast band to well over 500 MHz, and provides a visual and audible indication when a signal is received. The circuit is designed to receive low-powered signals as well as strong sources of....
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Usually keyboard is connected by using matrix type of connection a‚ rows and columns. For instance for 12 button keyboard wee need 3 4 digital inputs of microcontroller. There is a way to build keyboard and connect to microcontroller using only one wire. For....
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In this article, I`ll show you how to build a coil gun. A coil gun is a device that fires magnetic projectiles at high velocities, using electricity. Coil guns require no explosive propellant, therefor can be fired an infinite amount of time, providing that....
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This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 presents a high resistance (>200K) thus clamping IC1 by holding....
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Since I implemented a D type flip flop using the PIC Logic Elements I thought I might go the other way and implement an entire D type flip flop in a single PIC. This uses the edge triggered and port change status interrupts and was an opportunity to have a....
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Gates U1a and U1b are configured as a low-frequency oscillator. The output waveform at pin 11 is nonsymmetrical with the positive portion of the signal, making up only 20% of the time period. Diode D1, a 1N914 general-purpose unit, together with C1, R1,....
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NE555 tour allows just as vibration. } E input pin 3 River) pulse frequency ult / 5 ~ 20Hz Fan Cave weeks bamboo. Barrel section to ridicule steep scheduled for R and C. Value. m transistor 1j and T} Hungary throw success rate system level power output fl1....
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Optoreflector sensors contain a matched infrared transmitter (LED) and infrared receiver (usually a phototransistor ) pair. These devices work by measuring the amount of light that is reflected into the receiver. Because the receiver also responds to ambient....
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This is a project I did during my B. E course. I always wanted to control my lights and other appliances in my room remotely while I`m somewhere else. Many a times I forget to switch off the fan or AC in my room and then I have to go back and switch it off.....
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The entire circuit consists of two parts - Lisheng power amplifier and the rectifier filter crossing. As shown in Figure 5-85 is a stereo audio power..
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The timer can be used wherever time periods of up to seven minutes duration are needed. To turn on just touch the turn-on plate, and after the selected time has elapsed, an alarm will sound for a short period, then automatically turn off. The turn-on touch....
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Using the A3952S stepper motor controller designed by Allegro MicroSystems can be designed a very simple and useful motor driver circuit that can be used in many electronic applications. A3952S stepper motor controller is capable of continuous output....
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The 10A H-Bridge Motor Controller circuit looks simple but there are some key points that you don`t want to miss. The main devices used in the circuit are the TIP147, TIP142 and 2n2222. The power circuit is the +12v coming in from the terminal block....
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Apart from the obvious usage as a headphone amplifier, the circuit can be used for a range of applications where a wide bandwidth low power amplifier is needed. The circuit is based on an opamp, with its output current boosted by a pair of transistors..
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This digital frequency meter of circuit is succinct, software potentiality is fully excavated, the survey accuracy of the low frequency band is high, have prevented the invasion of the interference effectively. The distinctive quality has embodied in and....
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The output of this circuit should be fed into a high-impedance load, say >100K, remembering that the impedance of C4 is around 3K. A PNP transistor can also be used, with the necessary changes to the supply voltage. An op-amp can also be used, connected as....
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A 6 V battery can provide 100-150 Vdc center-tapped at a high internal impedance (not dangerous though it can inflict an unpleasant jolt). A 6.3 V transformer is connected ' 'in reverse'' with a transistor used in a Hartley oscillator configuration. The....
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DR-650 wiring diagram. Suzuki DR-650 is a single cylinder, dual-sport motorcycle. This off-road bike wiring diagram is has wire colors code included. This DR-650 schematic diagram has complete parts wires connection to show, like speedometer, lights, CDI....
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This circuit is which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit described here can be used to....
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How does one measure small inductances with a precision of at least two, and possibly three, significant digits A search of the literature produced scanty results. One interesting circuit was described in The 2001 ARRL Handbook on p 26. 22. I built a....
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A DC-to-DC step-up converter is traditionally implemented using transformer, working by converting the DC voltage to AC Voltage, step-up it using transformer, then rectify and filter the transformer`s output to get a higher DC voltage. Using a switching....
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By mixing an audio signal with ultrasound, you can hear the audio as if it's inside your head... even if the 'headphones' are nowhere near your ears. Patrick Flanagan invented the "Neurophone" over 40 years ago. His original patent (US3393279) was basically....
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The PICAXE basic code is easy: the main loop keeps looking for a signal from the IR receiver via the irin command. When it gets a code, it places in....
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FGDF-3 three-phase low-temperature iron plating power commutation control switch and electronic circuit KGDF-3 low-temperature iron plating power supply device having a single-..
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The circuit consists of a frequency modulated oscillator, an audio preamplifier with pre emphasis to supply the frequency modulating signal, and a buffer amplifier to drive the antenna connector. Oscillator's frequency is determined by L1 resonating with the....
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Circuit consists VTl. ~ VT7 and other components. Since receiving the signal emitted by the transmitter is very weak emblem, the circuit uses multi -stage amplifier, the output..
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The first thing I need to know how C1 is related to resonance frequency f of the circuit. It seems like I can choose a frequency and I automatically get a needed value for C1. I have a lot of doubts I don`t know if the circuit constitutes a Colpitts or....
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The The reciprocating detector was designed by R. S. Badessa at M. I. T. The RD features a carrier-synthesized reference signal and requires no external bfo. The circuit offers advantages over conventional detectors in that it adjusts its bfo level....
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When change the value of R2 Intensity of Lamp change to this circuit shows the usability of Mosfet be Variable Resistor. By Q1 use N-Channel Power Mosfet. but what is the number all right follow the size of Load or Lamp there. When change the value of R2....