• Universal Compander

    Unclassified  2017-09-13 23:03:1159

    Signetics` type NE575 compander IC is intended primarily for use with battery power supplies of 3 to 7 V (max. 8 V). It draws a current of 3.5 mA at 3 ...

  • Jane Russell Radio Crystal Radio

    Unclassified  2017-09-13 22:26:1859

    I have never built a radio with more shape than this. This is not some mickey mouse radio. This radio is a high performance set suitable as an entry in...

  • Auto-zeroing-scale

    Unclassified  2017-09-13 22:02:5959

    Electronic scales have come into wide use and the HA-510X, as a very low noise device, can improve such designs. This circuit uses a staingauge sensing...

  • Out Stage By 2SC4793 and 2SA1837

    Unclassified  2017-09-13 21:11:5559

    Those 4 transistors in the diamond should be together 2 and 2. First the two 2SC4793+2SA1837 and also the two 2N5551+2N5401. It is also good if those t...

  • Amplified Noise Limiter For Sw Receivers Circuit

    Unclassified  2017-09-13 20:46:3459

    The noise limiter circuit has a preamplifier clipper, and a switchable audio bandpass filter. Audio levels in the 5- to 50-mV range are amplified in a ...

  • Goes Postal With Crystal Set!

    Unclassified  2017-09-13 19:18:3959

    My apologies to our fine workers in the post office, but I couldnt help myself. Give Dave a day off from work and you see what happens. Well, this is m...

  • The Arachniodyne Crystal Set

    Unclassified  2017-09-13 19:04:3459

    Welcome to my #20 page. This radio is a dual spider coil radio. The antenna input coil is wound with 70 turns of 40/44 litz for an inductance of 350 H....

  • Op-Amp Mic Preamp

    Unclassified  2017-09-13 18:05:1959

    Description: A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The opamp used can be an...

  • Octave Equalizer Circuit

    Unclassified  2017-09-13 17:46:4859

    This circuit is one section of an octave equalizer used in audio systems. The table shows the values of CI and C2 that are needed to achieve the given ...

  • Ultrasonic Pest Repeller Circuit

    Unclassified  2017-09-13 17:10:2259

    This circuit uses two transistors and one IC (555 timer IC) to produce a pulsating ultrasonic frequency. Transistors Ql and Q2 are connected in a direc...

  • Guitar and bass tuner

    Unclassified  2017-09-13 16:58:2859

    The heart of the circuit is IC2, a 50240 top-octave generator. That device uses a single input-frequency to generate all twelve notes of the musical sc...

  • The Contra Coil Radio

    Unclassified  2017-09-13 16:48:2059

    Hi Gang! Yes, I know its been a while since my last crystal set. But you know how us artists are - undependable. I hope you feel it was worth the wait ...

  • Canary Sound Simulator Circuit

    Unclassified  2017-09-13 15:38:3659

    This circuit generates the sound of two canaries singing in a cage. Two LM324 quad amps make up seven oscillators. One oscillator is an on/off control,...

  • Broadband frequency doubler

    Unclassified  2017-09-13 15:07:2959

    This circuit will double low-level signals with low distortion. The value of C should be chosen for low reactance at the operating frequency. Signal le...

  • LP2950 100mA Low Dropout Voltage Regulators Application Cir

    Unclassified  2017-09-13 14:05:1159

    To fulfill the project specification of the Helm having sufficient battery capacity for 8 hours of continuous operation, we measured the current throug...

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