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  • Automatic Repeater

    2017-09-10 18:00:1761

    Description This circuit will be of interest to the radio amateur and anyone posessing two radios, (one of whichmust be able to transmit i.e. a transce...

  • Analog Delay Line (Echo And Reverb)

    2017-09-10 17:48:4061

    This circuit uses an SAD 512D (Reticon) chip, which is a 512-stage analog shift register. By varying th e clock frequency between 5 and 50 kHz, delay t...

  • Four-channel-mixer

    2017-09-10 16:23:4660

    No description available. No description available. Reprinted Url Of This Article: http://www.next.gr/audio/mixers/four-channel-mixer-l13490.html Decla...

  • Old-Time Radio

    2017-09-10 15:00:5360

    This circuit was used in the early days of radio to receive signals. Almost any battery-operated triode, such as a type 30, can be used. `A` battery is...

  • AMC7135 350mA Advanced Current Regulator

    2017-09-10 14:54:2860

    The AMC7135 is a low dropout current regulator rated for 350mA constant sink current. The low quiescent current and low dropout voltage is achieved by ...

  • Homemade 3 Tube All Wave Radio

    2017-09-10 14:26:1464

    Homemade 3 Tube Radio Well folks, I am up to a 3 tuber. I have revisedthe circuit since I built this is 2002. The first tube is a type 32 used as an un...

  • A Tube Radio

    2017-09-10 12:48:4260

    Have you been wondering what could be a new use for that old oscillation transformer you had left over from your spark days? Well, look what I have coo...

  • Crystal Clear!

    2017-09-10 12:25:5562

    Here is a simple one, gang! My Crystal Clear radio is built around a coil that was made for me by Master Woodworker Tom Kipgen. Most of my designer rad...

  • Crystal Radio with a Contra-Coil

    2017-09-10 11:22:4260

    Preamble This radio has been previous published in the December 2010 and January 2011 issues of Monitoring Times Magazine. This page will show only the...

  • Q- Multiplying Loop Antenna

    2017-09-10 10:18:1460

    Circuit diagram: Circuit Notes This circuit is designed to be used in conjunction with the standard 4 footsquare loop used in MW for long distance rece...

  • Pulse-Frequency Modulated Receiver

    2017-09-10 10:09:4260

    This receiver uses an IR-sensitive phototransistor (Clairex, HP, etc.) mounted in a light-tight enclosur e with an aperture for the incoming IR beam. A...

  • TDA8177 VERTICAL DEFLECTION BOOSTER Applications Circuits

    2017-09-10 10:02:5284

    Designed for monitors and high performance TVs, the TDA8177 vertical deflection booster delivers flyback voltages up to 70V. The TDA8177 operates with ...

  • SN74LS164 8-BIT Parllel-Out Serial Shift Registers

    2017-09-10 09:48:5860

    The SN74LS164 is a high speed 8-Bit Serial-In Parallel-Out Shift Register. Serial data is entered through a 2-Input AND gate synchronous with the LOW t...

  • 5W 80M Cw Transceiver

    2017-09-10 09:36:4361

    This transceiver has a 3-stage transmitter and a direct-conversion receiver. Ql is the transmitter`s oscillator, an d the frequency is controlled by XI...

  • 12V stroboscope

    2017-09-10 08:00:2460

    12V stroboscope Summary of circuit features Brief description of operation: Flashing light at adjustable speed, needs external trigger signalCircuit pr...

  • MOC3020 6pin DIP photocoupler, triac driver output

    2017-09-10 07:56:3160

    The MOC3020 is optically coupled isolators consisting of a Gallium Arsenide infrared emitting diode coupled with a light activated silicon bilateral sw...

  • Musical Envelope Generator And Modulator

    2017-09-10 06:58:0261

    A gate voltage is applied to initiate the proceedings. When the gate voltage is in the ON state, Q l is turned on, and capacitor C is charged up via th...

  • Piezo Micropositioner Driver Circuit

    2017-09-10 06:56:1460

    The PA41 from Apex Microtechnology is used here to drive a piezoelectric micropositioner. The drive voltage is less than 20 V p-p at input. Reprinted U...

  • Sight n sound metronome

    2017-09-10 06:47:0561

    Precise, adjustable control of beats per minute from a largo of 18 to a frenzied, high presto of 500, These beats are produced acoustically through a s...

  • Am demodulator

    2017-09-10 06:01:5662

    Amplifying and limiting of the AM carrier is accomplished by the if gain block providing 55 dB of gain or higher with a limiting of 40 ?μ\. The limite...

  • Double Litz!

    2017-09-10 05:03:5560

    After 20 comes 21. It is too bad I am all out of those Remler capacitors. Ok, on to 21. This crystal radio features two coils. One tunes the top half o...

  • TV and FM jammer schematic

    2017-09-10 04:32:4960

    The Jammer is a very small circuit and can fit inside a small plastic box with 9V battery inside. It can be very illegal if you attach an external ante...

  • The Seductive Sexy Sizzler Set

    2017-09-10 04:30:4360

    This is my coolest crystal set yet! Too bad you wont be able to reproduce this one as the capacitors arent made anymore. However, they can be found. Ai...

  • The Track-Tuned-Beauty Crystal Radio

    2017-09-10 04:02:0961

    Introduction Hi Gang. Remember me? Its been a long time since I built my last radio. I have been gathering ideas with my associates at the Secret Radio...

  • Central-image-canceller

    2017-09-10 01:47:3760

    The circuit allows you to eliminate the vocal portion of an audio signal, while leaving the instru mental portion. The circuit mixes two channels that ...

  • Am Envelope Detector

    2017-09-10 01:37:2361

    This general-purpose detector for AM envelope detection can be used in many receiver applications. T1 matches the IF a mplifier impedance (typically 1 ...

  • Musical chime generator

    2017-09-10 01:08:0060

    The circuit is that of a multiple feedback bandpass filter. A short click (pulse), makes it ring with a frequency which is its natural resonance freque...

  • Extended On Time Timer Circuit

    2017-09-10 00:43:0260

    Half of a Motorola MG14538B dual, precision, retriggerable mono stable multivibrator is used to form an extended on-time timer circuit. That type of ci...

  • Cmos mixer

    2017-09-10 00:33:0462

    Four inputs can be mixed by duplicating the circuit to the left of C3 and using the fourth gate of ICI. Two gates are used in a touch-operated switchin...

  • Stroboscope trigger circuits

    2017-09-10 00:18:2661

    Stroboscope trigger circuits This page contains some information on circuits which can be usedfor triggering stroboscopes from external circuits.The ci...

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