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  • Universal Compander

    2017-09-13 23:03:11108

    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

    2017-09-13 22:26:1889

    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

    2017-09-13 22:02:5982

    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

    2017-09-13 21:11:5588

    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

    2017-09-13 20:46:3469

    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!

    2017-09-13 19:18:3976

    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

    2017-09-13 19:04:3474

    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

    2017-09-13 18:05:19126

    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

    2017-09-13 17:46:4892

    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

    2017-09-13 17:10:2293

    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

    2017-09-13 16:58:2876

    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

    2017-09-13 16:48:2097

    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

    2017-09-13 15:38:3677

    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

    2017-09-13 15:07:2979

    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

    2017-09-13 14:05:1184

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

  • Cmos Piezo Driver Using 4049 Circuit

    2017-09-13 14:03:1564

    This circuit uses a 4049 IC to drive a 2N2222 switching transistor. The transistor drives crystal 1 a piezo transducer. Reprinted Url Of This Article: ...

  • Transformerless-annunciator

    2017-09-13 13:59:5862

    This circuit does not require an output transformer or an output coupling capacitor; the annunciator can easily be turned on or off by a control input ...

  • Voice Scrambler/Descrambler

    2017-09-13 13:26:5066

    This circuit uses an NE602 as an inversion mixer. U2 is set to run at about 2.5 to 3.5 kHz. U3 drives a loudspe aker. Because speech inversion scrambli...

  • The WAYSALOT Crystal Radio

    2017-09-13 12:43:4763

    Introduction Dont drop this on your toe! It will hurt! This radio sure weighs a lot (a total of nearly 12 pounds (5,5 kg). Now that I got all the legal...

  • DX Receiver

    2017-09-13 12:29:5169

    It finally had to come to this. A 660/46 litz wire crystal set. The litz wars have started. This is kind of a litzkrieg. I imagine that we will need a ...

  • Crystal Radio - Elgrande

    2017-09-13 11:38:3762

    I call my #6 set the El Grande . This is an update of my fifth receiver. I found the knobs, the tap switch points and arm at Play Things Of Past. Gary ...

  • Single Tuned Crystal Set Crystal Radio

    2017-09-13 11:36:0463

    Hi there. Here is a pretty simple crystal set project that you and the kids can build before any of you lose your concentration. The tuned circuit is b...

  • Fm Generator

    2017-09-13 11:13:4363

    The internal zener on pin 15 of the 4046B supplies a stable voltage to the 3140IC op amp. This amplifier modulates the 4046B V CO. The amplifier gain i...

  • Micrometronome

    2017-09-13 10:57:1062

    This compact metronome will run for years on a single nine-volt transistor battery. Has both tone and pulse rate controls, and uses touch plates to sta...

  • Mixer Diplexer

    2017-09-13 09:54:3062

    By inserting a high-pass filter section in the IF lead, this mixer is terminated at all frequencies, besides the IF, for oth er mixer products, which r...

  • Accentuated beat metronome

    2017-09-13 08:44:1563

    IC3 acts as an oscillator which operates if the output of ICl is high. With the values used the two frequencies produced are about 800 Hz and 2500 Hz. ...

  • Ultrasonic-transceiver

    2017-09-13 08:41:1962

    This ultrasonic transmit/receive circuit operates at 40 kHz. Control resistor R5 adjusts the frequency for best performance with the transducers used. ...

  • Funk box

    2017-09-13 08:01:2163

    Adjusting potentiometer R7 adds extra twang from way down low to way up high. To set the unit, adjust potentiometer R4 until you hear a whistle (oscill...

  • Variable-slope-compressor-expander

    2017-09-13 06:56:1262

    Compression and expansion ratios other than 2: 1 can be achieved by the circuit shown. Rotation of the dual potentiometer causes the circuit hook-up to...

  • The Hellenedyne Regenerator

    2017-09-13 06:52:3564

    Introduction Hello friends, neighbors and all the ships at sea. dit-dit-dit-dah. I bring forth news ofa new tube radio design. It isn't my design, but ...

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