Position: Index > Unclassified >
  • Downbeat-emphasized-electronic-metronome

    2017-09-09 23:51:5260

    ICla and IClb form an astable multivibrator. The astable`s signal is fed to IC1c, also to the clock input of IC2, a 4017B decade counter. That IC`s QO ...

  • Tone-burst-generator

    2017-09-09 23:50:3661

    Most European repeaters must be brought up with a 1750-Hz tone. The SK3733 (also known as an ECG1197) IC contains a crystal oscillator and is divided b...

  • Short Wave Receiver

    2017-09-09 23:48:5260

    Using a Signetics NE602 in a varactor-tuned front end, the circuit of a shortwave receiver can be very simple and yet g ive high performance. This circ...

  • Ultrasonic-receiver

    2017-09-09 23:15:2661

    The piezo speaker, MICl, picks up the incoming ultrasonic signal and feeds it to the base of Ql. The two-transistor booster amplifier, Ql and Q2, raise...

  • Attenuator circuit

    2017-09-09 22:44:2860

    A op amp and transistors Q1 and Q2 exponential converter to generate an exponential gain control current, which is introduced into the rectifier. A ref...

  • Fuzz-box

    2017-09-09 21:58:0761

    The 741`s maximum gain of 20,000 is pushed to nearly 3 million dB, and therefore distorts the output. That distortion provides the fuzz sound. The leve...

  • Crystal Radio Dave's Easy Tuner

    2017-09-09 20:24:3860

    Introduction It was two days before the hamfest, and I had nothing to show off there! I know this would have disappointed a couple of people. I was thi...

  • Sound-Level Meter

    2017-09-09 20:01:5960

    The NE604`s signal-strength indicator section is used, based on an internal logarithmic converter. This enables a linear decibel scale so that the movi...

  • 10Mhz coaxial line driver

    2017-09-09 18:28:5962

    The circuit will find excellent usage in high frequency line driving systems that require wide-power bandwidths at high output current levels. (IC=HA25...

  • MJE340 Connection Diagram

    2017-09-09 18:06:2861

    Developed for receiving RTTY transmitted from satellite as space-only keying. Receiver can be operated in CW or narrow-filter mode, to increase signal-...

  • Ultrasonic Sound Source

    2017-09-09 17:54:5660

    Using two NE555 timer IC devices, this circuit generates either pulsed or continuous ultrasonic signals. The value s of CT for both pulse rate and ultr...

  • Electronic Bagpipe

    2017-09-09 17:41:4861

    The electronic bagpipe mimics the sound of real instruments. This circuit uses two UJT oscillators and an amplifier (Q3, Q4, and Q5). R7 through R22 ar...

  • Tremolo

    2017-09-09 16:52:3164

    The VCO of Ul, a phased-locked loop. produces a low-frequency square-wave signal from 5 Hz to 2500Hz, which is controlled by varying the voltage to pin...

  • TL431C Adjustable precision shunt regulators

    2017-09-09 16:46:2061

    The TL431C is 3-terminal adjustable shunt regulator with specified thermal stability over applicable automotive and commercial temperature ranges. The ...

  • Unijunction metronome

    2017-09-09 16:36:0760

    The UJT-oscillator frequency is determined by the 100 ?μ?¥ capacitor and the effective resistance of the 22 and 470 resistors and the potentiometer....

  • Oscilloscope Preamp

    2017-09-09 16:17:1860

    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 V by a variable gain control. T...

  • Train chuffer

    2017-09-09 16:12:4261

    The circuit consists of a white noise generator which only switches on with the high part of the square wave output from the clock circuit. The frequen...

  • Radio Commercial Zapper Circuit

    2017-09-09 15:59:5360

    The LR inputs are summed, dated and drive a comparator. The comparator senses level and generates a transition when audio inputs go above or below pres...

  • Noise Generator Circuit

    2017-09-09 15:46:2860

    This circuit generates noise pulses that are suitable for test purposes, etc. A zener diode is used as a noise source. IC1 is a relaxation oscillator. ...

  • Metronome Circuit

    2017-09-09 14:44:1960

    Description: A metronome circuit based on a simple astable. The output sound is distorted to emphasize the pulses. Circuit diagram: Circuit Notes This ...

  • General-Purpose Jfet Preamp Circuit

    2017-09-09 14:34:5060

    This JFET preamplifier has a gain of about 20 dB and a bandwidth of over 100 kHz. It is useful as a low-level audio amplifier for high- impedance sourc...

  • Bull horn

    2017-09-09 14:14:3260

    The input audio signal is fed to pin 3 of Ul, an LM386 low-voltage amplifier, via C3 and Rl. Potentiometer Rl sets the drive or volume level. Ul, which...

  • 10 Note Sound Synthesizer Circuit

    2017-09-09 13:12:2062

    As shown, three ICs are used to produce the sounds. ICl is a 555 timer that generates clock pulses. It is configured as an astable multivibrator. The f...

  • Fm-mpx-sca-receiver

    2017-09-09 12:38:4060

    This receiver is capable of better than 1.5 p, VIHF sensitivity and uses MOSFET front-end circuitry with varactors to eliminate conventional bulky tuni...

  • Pink noise generator

    2017-09-09 11:44:0460

    A reverse-biased pn junction of a 2N2712 transistor is used as a noise generator. The second 2N2712 is an audio amplifier. The 005 ?μf capacitor acros...

  • Space Age Sound Machine Circuit

    2017-09-09 11:40:1160

    The space-age sound device uses a 556 dual-times IC to produce a phasor sound. That IC is actually two 555 timer ICs in one 14-pin package, as shown in...

  • CS4344 Pin Functions And Circuit Diagrams

    2017-09-09 11:34:1260

    The CS4344 : 10 - pin 24 - bit , 192 kHz Stereo D / A converter Many Delta - modulator 24-bit conversion Automatic detection of up to 192 kHz sampling ...

  • The Triangle Redone Crystal Radio

    2017-09-09 11:17:3860

    Another triangle radio! The last time I bought boxes, I received two triangular boxes. I used the smaller one to build my #34 set. I was very impressed...

  • Low-cost-line-receiver

    2017-09-09 11:01:2863

    This timer makes an excellent line receiver for control applications involving relatively slow electromechanical devices. It can work without special d...

  • Full Detection Crystal Radio

    2017-09-09 10:29:3760

    Introduction Hello fellow radio builders! Instead of watching my tomato plants grow, I thought I would take my mind off that and make another radio. It...

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