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  • Sound operated flip flop.

    2018-02-26 09:45:2161

    Description. Here given is a circuit in which the status of the output pins of a Flip Flop IC can be toggled by using sound. A condenser microphone is ...

  • LC meter, Coil Capacitor meter

    2018-02-26 09:38:5260

    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 decre...

  • Electronic dog repellent, dog chaser schematic

    2018-02-26 09:33:5562

    The electronic dog repeller circuit produces a discomforting but not harmful, high frequency sound, audible to dogs but not to humans. Help stop the ap...

  • Noise reduction circuit

    2018-02-26 09:16:3860

    The noise reduction circuit is based on the observation that noise is always disturbing in intervals when music stops. It will attenuate the signal out...

  • Electronic Dice circuit

    2018-02-26 09:04:5360

    With this electronic dice the result is displayed with LEDs that are placed so every dice face is shown. In the circuit diagram, IC 4022 is used to cou...

  • Do It Yourself Solid State Relay

    2018-02-26 08:40:4160

    One advantage of solid-state relay (SSR) over conventional electro-magnetic relay (EMR) is its tear and wear free operation. S201S01 from Sharp is a go...

  • Nicad Charger by IC CA3140E

    2018-02-26 07:59:4560

    This is easy circuit charger batt Nicad. For batt 1.2V. When you have NiCad Battery should want to have Battery Charger Circuit. I begs for to advise N...

  • Signal meter circuit

    2018-02-26 07:56:2260

    The CA3189 IC integrates a symmetrical limiter, a phase demodulator, an audio amplifier, and a logarithmic detector-amplifier. The logarithmic detector...

  • Smart Cooling Fan Circuit

    2018-02-26 07:35:0160

    A continuously running cooling fan is a big nuisance and is not very crucial in most instruments. The 12V smart fan control presented here allows the f...

  • Photo relay circuit

    2018-02-26 07:27:2860

    Description. A photo relay or light activated relay is a circuit which opens and closes the relay contacts according to the light.Here a photo diode is...

  • Nokia 6100 Manual

    2018-02-26 07:21:5960

    Nokia 6100 Service Manual Overall Manual Contents: Simple yet sophisticated, compact yet comfortable. Dont let its size deceive you the Nokia 6100 phon...

  • Photodiode Design Note

    2018-02-26 07:09:3560

    Photodiode is a type of light detector capable of converting light energy into either current or voltage, depending upon the mode of operation. Photodi...

  • QRP antenna tuner circuit

    2018-02-26 06:49:3060

    ?Description. Low power ( 3 to 30 MHz)? transmitters constructed by hams are generally called QRPs. For such transmitters a well tuned antenna is a mus...

  • Fabrication techniques of a P-N junction diode

    2018-02-26 06:24:1160

    General Introduction to?Fabrication techniques of a P-N junction diode: pn-junction-fabrication In practice, the P-N junction is formed from a single m...

  • Time delay relay circuit

    2018-02-26 06:16:4360

    This time delay relay circuit is built with IC NE/SE555, produced by Intersil which contains a precision timer. Stability to temperature variations is ...

  • Blinker circuit

    2018-02-26 05:46:5061

    The blinker circuit design is made using the LM395 IC. This IC is a short-circuit proof power transistor with special characteristics. This is sometime...

  • Nokia N73 schematics

    2018-02-26 05:32:0360

    Service schematics for Nokia N73 the purpose of this document is to provide futher repair information for NOKIA mobile phones on Level 3/4 service acti...

  • 1 Hz Pulse Frequency Generator

    2018-02-26 05:07:3962

    Here is a 1Hz pulse/frequency generator using the popular timer IC 555 which is wired as an Astable Multivibrator. The output pulses can be indicated v...

  • Infrared Receiver circuit with BPW41N

    2018-02-26 03:56:2160

    This infrared receiver is used with this infrared transmitter. The output signal of D1 IR diode is amplified by IC1. The diode is BPW41N works great wi...

  • REPLACING A 556 WITH TWO 555's

    2018-02-26 02:56:3162

    REPLACING A 556 WITH TWO 555's Here is a handy reference to replace a 556 dual timer with two 555's: The table shows the pin numbering for each timer: ...

  • Voice, sound recorder circuit schematic

    2018-02-26 02:29:5260

    This voice or sound recorder built with ISD1012, ISD1016 and ISD1020 which are produced by ISD and allow sound voice recording and play-back. The last ...

  • Triangle Wave Generator circuit

    2018-02-26 02:20:5961

    This triangle wave generator is made with a trigger Schmitt that converts a triangle wave into a rectangular one used to charge and discharge a capacit...

  • 27MHz CB receiver circuit

    2018-02-26 02:13:0260

    This is a simple 27MHz FM-CB receiver circuit built with TCA440 for listening CB ( citizens band ) transmissions with FM (frequency modulation). The se...

  • Signal generator with thyristor

    2018-02-26 01:54:0961

    A very simple thyristor signal generator circuit which uses a single thyristor, two resistors, a capacitor and a mini-loudspeaker. Once the circuit is ...

  • LASER diode

    2018-02-26 01:34:5162

    Laser is of prime importance in Optical memories, Fiber optic communications, Military applications, Surgical procedures, CD players, Printers etc. Var...

  • Improved Infrared Detector circuit

    2018-02-26 01:22:3860

    This improved infrared detector is specifically intended for use with commercial IR remote control handsets. This little circuit is useful for quick go...

  • Nokia 6230 service manual

    2018-02-26 00:58:3660

    Nokia 6230 service manual contains: - general info - parts lists and components layout - service software instructions - service tools - 6230 disassemb...

  • MOSQUITO REPELLER Circuit

    2018-02-26 00:17:4863

    MOSQUITO REPELLER Circuit This circuit produces a tone above the human audible range and this is supposed to keep the mosquitoes away. You need a piezo...

  • Sound Level Meter Circuit

    2018-02-26 00:02:3960

    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...

  • Infrared motion detector circuit

    2018-02-25 23:59:4260

    Description. Here is the circuit diagram of an infrared motion detector that can be used to sense intrusions. Infra red rays reflected from a static ob...

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