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  • Four channel mixer

    2017-09-12 10:30:1561

    High gain op amp combines up to four individually controlled input signals The dc power source should be well filtered (battery is ideal), and the circ...

  • Sound effect generator

    2017-09-12 10:23:4860

    This waveshape generator is basically a slow running oscillator with variable attack and decay. A variable amplitude (high impedance) output is availab...

  • Electret Mike Preamp Circuit

    2017-09-12 08:54:4261

    This circuit is suitable for using an electret microphone for many applications. A 1.5-V battery is used. CI and R3provide treble boost/bass cut; they ...

  • The Big One

    2017-09-12 08:34:0060

    The nearly 12x 14 inch (30 x 35 cm) oak base this radio is mounted on gives you an idea of why this is named The Big One. This radio is not my design. ...

  • The Dual Triode Shortwave Regenerator

    2017-09-12 06:30:2060

    Introduction What? Another radio? So soon? When the stock market goes south, I build more radios.Keeps my mind occupied. This radio started differently...

  • Fuzz box 4

    2017-09-12 06:11:2263

    None of the components are particularly critical in value or quality, as distortion is the sole object The transistor could be BC107-8-9, 2N2926, etc. ...

  • Crystal Set By Dave Schmarder

    2017-09-12 06:04:1161

    Perhaps you are starting to see a trend here. I am getting to know those nice folks at Bed Bath and Beyond. I might try squeezing two variable capacito...

  • 40M-cw-transceiver

    2017-09-12 05:38:2260

    The unit consists of a direct conversion receiver and 1-W transmitter. The direct conversion receiver VFO is tuned just off frequency from the incoming...

  • 120Khz-500w-induction-heater

    2017-09-12 02:02:2360

    Variable width pulses with fast rise times are provided by Ul, and MC34060 operating at 120kHz, the optimum frequency for heating aluminum alloy contai...

  • Isolation between antenna network and TV/radio equipment

    2017-09-12 01:59:2560

    Isolation between antenna network and TV/radio equipment A ground loop in your AV system caused by antenna connection orTV cable is very common if you ...

  • Sunday Morning Special Crystal Radio

    2017-09-11 22:48:5361

    Here is a little project that I built in a few hours. A customer wanted a set that would be simple, have a detector stand and was cheap. When people th...

  • Dual Tone Sounder Circuit

    2017-09-11 22:36:5860

    An outside horn-type speaker works best with the circuit. However, such devices require a great deal of power, so this sounder should only be used in a...

  • Vox box

    2017-09-11 22:12:3860

    The electronic circuit in the VOX Box consists of three parts: a microphone preamplifier, a Schmitt trigger, and a relay driver. Input signals (MIC INP...

  • Passive mixer

    2017-09-11 21:49:1275

    This simple circuit can be used to combine stereo signals to produce a monaural output K1 and R2 isolate both circuits and R3 controls the level of the...

  • Backup Beeper

    2017-09-11 21:03:0460

    When the vehicle`s backup lights kick on, or when the manual switch (SI) is closed, a small current is fed to the base of Ql. Transistor Ql allows curr...

  • Portable-rf-burst-generator

    2017-09-11 20:51:5560

    The circuit generates low-level rf bursts having frequencies as high as 10 MHz, thus permitting field testing of high frequency receivers. A jumper-sel...

  • Signal-combiner

    2017-09-11 20:50:3660

    This circuit uses buffer stages to prevent channel crosstalk back through the mixer resistor network. The potentiometers used for each stage allow for ...

  • One Tube Wonder - Tube Crystal Radio

    2017-09-11 20:29:0160

    Are you afraid that when the big one is dropped, the electromagnetic pulse will wipe out your diode? Well, this crystal set may be the answer. Tubes do...

  • Schmarder's Super Spider Sizzlitzer Set

    2017-09-11 20:24:4560

    Hi crystal radio fans. This is my #49 set. This set is a modified Australian Mystery Set (a.k.a. Telefunken). There is an important twist in this desig...

  • Wideband-signal-splitter

    2017-09-11 20:24:3561

    With one HA-2539 or HA-2540 and two low-capacitance switching diodes, signals exceeding 10 MHz can be separated. This circuit is most useful for full-w...

  • Receiver Af Noise Limiter For Low-Level Signals Circuit

    2017-09-11 19:53:4661

    A preamplifier in the audio frequency range amplifies a noisy audio signal to drive a diode clipper. Suitable audio input levels would be in the 10-mV ...

  • LF353N Connection Diagram

    2017-09-11 17:57:1662

    This circuit senses the video from the VCR. When the VCR is turned on, video signal is amplified by U3A and B to drive Q1, actibating K1. In this manne...

  • Hi-fi-expander-with-de-emphasis

    2017-09-11 17:38:2960

    The expander to complement the compressor is shown. An external op amp is used for high slew rate. Both the compressor and expander have unity gain lev...

  • Fm-snooper

    2017-09-11 17:24:4461

    The FM Snooper is an FM transmitter that radiates a continuous wave whose frequency is altered according to the sound waves striking the microphone. An...

  • crystal receiver

    2017-09-11 14:13:0560

    Hi friends. Well, this one is kind of a repeat of my last set. But I had this box that I bought at a hamfest fleamarket and I now found the right momen...

  • Loop Antenna For 3.5 Mhz

    2017-09-11 14:01:4261

    C1 = 3 750 pF 500 V silver-mica capacitor. C2= 100 pF preset capacitor (Jackson C803). C3 = 75 pF variable capacit or (Jackson C809), plus knob. C4 = 1...

  • IR2125 Current Limiting Single Channel Driver

    2017-09-11 13:46:3960

    The IR2125 is a high voltage, high speed power MOSFET and IGBT driver with over-current limiting protection circuitry. Proprietary HVIC and latch immun...

  • Crystal Set

    2017-09-11 13:17:2160

    Hello again crystal radio fans. Just cant get enough of these crystal sets, huh? Ha ha, me too. The solder had barely cooled from my first crystal set,...

  • Suppress Jitter With Hysteresis Circuit

    2017-09-11 12:45:1160

    When the comparator`s output changes its state from low to high, the rising edge of the output pulse, differentiated by the Cl/Rl chain, opens Ql. This...

  • 1N5401 Connection Diagram

    2017-09-11 12:28:4560

    The circuit in Fig. 56-11a lights the signal lamp upon detecting a line current consumption of more than 5 mA, and handles currents of several amperes ...

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