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Circuit Project Electronic

Circuit Project Electronic
power supply, power amp, Circuit TV, electronic control, battery chart, lighting, basic electronic
Articles: 1, 2, 3, 4, 5, 6, 7


Easy power supply 0-15V , 0-1A
2007-09-12 16:39:00
TR1 provides a constant current to a bank of three zener diodes, thus maintaining a constant voltage independant of supply voltage variations. The resistor Rx is used to sense the PSU output current and to switches off the current to the zener diodes should the output current become excessive. The 1M0 (logarithmic ...
More About: Power , Easy
PWM DC motor control with SG3525
2007-09-12 16:26:00
This control circuit is ideal for the accurate control of DC motors as well as other applications like lighting levels and small heaters etc. The circuit converts a DC voltage into series of pulses, such that the pulse duration is directly proportion to the value of the DC voltage. The great advantage of such a ...
More About: Motor , Control
Stepper Motor Driver using L298 and L297
2007-09-12 16:20:00
This Step motor controller uses the L297 and L298N driver combination; it can be used as stand alone or controlled by microcontroller. It is designed to accept step pulses at up to 25,000 per second. An on-board step pulse generator can be used if desired (40-650 pps range). Single supply operation is standard All eight inputs ...
More About: Motor , Driver
PWM motor controller with IC LM339,LM324 (PDF)
2007-09-12 16:06:00
PWM motor controller Image circuit pdf file, LM339,LM324 part. Electronic Control, LM324, lm339, Motor Control, Pulse Generator, PWM Speed MotorShare This
More About: Controller , Troll , Roller
300ma DC-to-AC Converter
2007-09-11 19:28:00
300ma DC-to-AC Converter : This circuit was used to provide battery backup to a device that had an AC (output) wall transformer. Due to quasi-sine-wave output and imprecise 60Hz output frequency, some devices might not work properly. Peak output is DC input voltage minus about 20 ohms drop. Use bigger output MOSFETS for ...
More About: Vert
LM379 Dual 6 Watt Amplifier
2007-09-11 19:12:00
This is circuit LM379 Dual 6 Watt Amplifier . OTL AMP, Power AmplifierShare This
220 Volts Flashing Lamps with Diode Bridge
2007-09-11 19:01:00
Especially designed for Christmas tree lamps Replaces old thermally-activated switches Parts: R1___________100K 1/4W Resistor R2,R5__________1K 1/4W Resistors R3,R6________470R 1/4W Resistors R4____________12K 1/4W Resistor C1__________1000F 25V Electrolytic Capacitor D1-D4_______1N4007 1000V 1A Diodes D5__________P0102D 400V 800mA SCR Q1___________BC327 45V 800mA PNP Transistor Q2___________BC337 45V 800mA NPN Transistor PL1__________Male Mains plug SK1__________Female Mains socket Read more Source: Thank you. Lamp Flasher, ...
More About: Lighting , Bridge , Flashing
Dual-rail Variable DC Power Supply with LM358
2007-09-11 18:52:00
Simple add-on for a single-rail supply 2.5V to 15V output Parts: R1,R2____________4K7 1/2W 1% or 2% Metal Oxide Resistors C1,C4,C5_______100nF 63V Polyester Capacitors C2,C3__________220F 25V Electrolytic Capacitors Q1____________BD437 45V 4A NPN Transistor Q2____________BD438 45V 4A PNP Transistor IC1___________LM358 Low Power Dual Op-amp Input and output connecting terminals etc. This simple unit provides a dual-rail variable output ranging ...
More About: Rail
Electronic Motocycle ignition CDI Honda C-90
2007-09-11 17:26:00
This Circuit is for 4 cylinder motor, Electronic Motocycle ignition for CDI Honda C-90. Use small circuit but good work. SCR 1 TIC106 Switching Component for drive ignition Coil to Sparkplug. Detail to see circuit. Automotive , Electronic Motocycle ignitionShare This
More About: Onda
6V backup battery power supply regulator with IC 7805
2007-09-10 18:19:00
This is circuit power supply, 6V backup battery power supply regulator with IC 7805 For inportant circuit, Because this circuit with backup system by Baterry 6V. Detail read in circuit. 7805, battery, Battery Backup Supply, Power supply circuit, power supply regulator, power supplyShare This
Mini 12VDC to 110V/220V Inverter
2007-09-10 18:04:00
This inverter will sufficiently power any of your 115VAC (or 220VAC)small appliances. T1 choice of amperage is yours to make, but if you can salvage a heavy-duty unit from somewhere, use it. The least expensive method to get a larger transformer would be to remove the old 2000v primary and then ...
More About: Mini , Vert , I 12
FM Transmitter with 2N2222
2007-09-10 17:46:00
The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. Parts C1 1 0.001uf Disc Capacitor C2 1 5.6pf Disc Capacitor C3,C4 2 10uf Electrolytic Capacitor C5 1 3-18pf Adjustable Cap R1 1 270 Ohm 1/8W Resistor 270 Ohm 1/4W Resistor R2,R5,R6 3 4.7k 1/8W Resistor 4.7K 1/4W Resistor R3 1 10k 1/8W Resistor 10K 1/4W Resistor R4 1 100k 1/8W Resistor 100K 1/4W Resistor Q1, Q2 2 2N2222A NPN Tran sistor 2N3904, NTE123A L1, L2 2 5 ...
More About: Radio Frequency , Mitt , Mitte , Transmitter
1.5 Volt Tracking FM Transmitter
2007-09-10 17:40:00
Operates from 87-109MHz. The current draw for this tracker is 3.7mA, so the 1.5V button cell will last a while. My experimental version was tuned to 87.6MHz and worked as expected on only 1.5 volts. When your circuit is working you should see the LED flash quite fast. Take your FM radio and search for the ...
More About: Radio Frequency , Tracking , Mitt , Mitte , Tran
Sequential Brake/Turn Lights with IC 4094,7555
2007-09-10 17:32:00
Bar-mode LED-cluster sequencer Can drive up to 16 clusters Parts: R1,R5____________1K 1/4W Resistors R2______________33K 1/4W Resistor R3_____________100K 1/2W Trimmer Cermet R4_______________1M 1/4W Resistor R6,R7,R8________10K 1/4W Resistors R9_______________4K7 1/4W Resistor R10_____________33R 1/4W Resistor (See Notes) C1_______________1F 63V Polyester Capacitor C2_____________100nF 63V Polyester Capacitor C3_____________470F 25V Electrolytic Capacitor D1______________LED (Any dimension, shape or color) D2,D3________1N4002 100V 1A Diodes D4–D15________LEDs High ...
More About: Lighting , Automotive , Sequential , Lights , Turn
Pulse-Generator & Signal-Tracer with BC547,BC557
2007-09-10 17:25:00
Dual-purpose test-instrument Very simple circuitry, 1.5V Battery-operated Parts: R1__________________1M 1/4W Resistor R2,R4_______________2K7 1/4W Resistors R3________________150K 1/4W Resistor C1__________________2n2 630V Ceramic or Polyester Capacitor (See Notes) C2,C3_______________4n7 63V Ceramic or Polyester Capacitors D1_______________1N4148 75V 150mA Diode Q1________________BC547 45V 100mA NPN Transistor Q2________________BC557 45V 100mA PNP Transistor SW1________________SPST miniature Slider Switch (See Notes) J1_________________Stereo ...
More About: Generator , Circuit , Signal , Racer , Puls
PWM DC Motor Speed Control with NE556,LM311
2007-09-09 17:03:00
The left half of the 556 dual timer IC is used as a fixed frequency square wave oscillator. The oscillator signal is fed into the right half of the 556 which is configured as a variable pulse width one-shot monostable multivibrator (pulse stretcher). The output of the one-shot is a variable width square wave ...
More About: Motor , Speed , Control
Stereo Test Tone Generator with LM324 and LM1458
2007-09-09 16:43:00
The purpose of this circuit is to create a pair of sine waves for testing stereo equipment. While it is useful for many types of audio test tone generation, the circuit is specialized for the purpose of aligning an FM Stere o Modulator, like the type used in low power FM stereo transmitters. Two tone outputs ...
More About: Generator , Test , Tone
50 Watt Amplifier with ICL8063 and 2N3055
2007-09-09 12:37:00
This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it ...
More About: Amplifier
100W RMS Amplifier with LF351
2007-09-09 12:31:00
The design is pretty much a standard one, and I’m sure there are commercial units out there that are similar. To my knowlwdge, it is not an exact copy of any commercial unit, nor am I aware of any patents on the topology. To experienced builders: I realize that many improvements and refinements can be ...
More About: Amplifier
VHF Video Transmitter
2007-09-09 12:22:00
This circuit is a powerful video sender in VHF band. The modulator section is designed to operate on either channels 7 to 13 or 14 to 29. For channels 7 to 13, L1 and L2 are 3 turns of #22 wire wound on a 3/16 inch form. For channels 14 to 29, L1 and L2 ...
More About: Video , Radio Frequency , Mitt , Mitte , Tran
Video to RF Modulator 189 MHZ
2007-09-09 12:16:00
This circuit is a RF modulator which can be used for modulating of video signals. The P1 controls the Light and the P2 controls the contrast of video signal. The RF modulated output signal can be received on the VHF band ( about 189 MHz ). Note that the circuit don’t modulate ...
More About: Video , Radio Frequency
Transformerless Power Supply
2007-09-09 10:43:00
I have received a few emails asking for a transformerless power supply. Here is such a supply. This supply uses no heavy step down transformer and has an extremely low parts count. The circuit can be built very small and can supply small currents for small projects. The major downfall of this supply is that ...
More About: Power , Tran
LM2002 power Amp CAR audio 5.2W
2007-09-08 17:52:00
LM2002 power Amp CAR audio 5.2W Car Cassette, car power amplifierShare This
More About: Power , Audio
Bicycle back Safety Light with IC 555 or 7555
2007-09-08 17:43:00
Flashing 13 LED unit, 3V supply Also suitable for jogger/walkers IC1 is a CMos version of the 555 IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 4Hz frequency. At 3V supply, 555 output (pin 3) sinking current operation is far better than sourcing, then LEDs D1-D6 are connected to the positive ...
More About: Safety , Lighting , Back , Light , Bicycle
One-IC two-tones Siren with IC 4093
2007-09-08 17:38:00
Double-tone Police sound Single-tone old ambulance sound This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the circuit diagram, the typical dual-tone sound of Police or Fire-brigade cars is generated, by the oscillation ...
More About: Tones , Siren , Tone
LM723 Regulated Power Supply for 13.8V 8A
2007-09-08 17:31:00
LM723 Regulated Power Supply for 13.8V 8A Link LM723, Power supply circuit, power supply regulatorShare This
PWM Pulse width modulation using 555
2007-09-08 14:41:00
IC1 astable gives a fixed square wave at pin 3, C1 and R1 derive uS trigger pulses from IC1 and this will trigger IC2 monostable or single shot, the voltage at pin 5 of IC2 will change the pulse width output of IC2, to get it working all the three RC combinations have to be ...
More About: Puls , Pulse
Battery Backup Supply with IC 7812 and 7805
2007-09-08 14:35:00
This is a 9V power supply which will work even on power failure. It uses a rechargeable battery and regulators. A transformer with 15-0-15 AC volts output is required. In the first regulator U1 the output is lifted up by 1.4V and in the second regulator U2 by a resistor divider. In the second regulator ...
More About: Backup , Battery
Soft Start Power Supply with IC LM317 and L200
2007-09-08 14:18:00
The output voltage rises slowly and reaches 15 V in 5 seconds. In order to perform this soft-start function, the LM317 voltage regulator IC requires an external universal PNP transistor and the L200 uses its internal comparator (pin 2). After switch-on, the rising voltage on the positive side of the charging electrolytic capacitor slowly turns the (initially ...
More About: Power , Start , Soft
5V Supply Derives Power From 3-Wire RS-232 Port
2007-09-07 18:47:00
The circuit of Figure 1 produces a semi-regulated 5V output from an RS-232 port. Unlike a PC-mouse supply or comparable circuits that rely on the modem-control signals DTR and RTS, this one operates with a 3-wire port (GND, Rx, and Tx), and obtains power only from the Tx line. (Except at high duty cycles, the ...
More About: Power , Port , Switching regulator , Wire
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