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  • Doppler Ultrasound Receiver Circuit

    2017-09-13 06:45:0261

    XTAL1 drives amplifier Q3/Q4, which is tuned to 2.25 MHz. The detected signal is fed to audio amplifier ICl. A 9-V supply is used. The circuit operates...

  • KA431 Programmable Shunt Regulator

    2017-09-13 06:12:2660

    The KA431 is three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set ...

  • Voice Scrambler/Disguiser Circuit

    2017-09-13 02:41:5560

    This circuit uses two balanced modulators to produce a DSB signal and then reinsert the carrier, except t he carrier now has a different frequency. Thi...

  • It's Miller Time!

    2017-09-13 01:11:4760

    Looking down Hello again crystal set fans. This is my rendition of the J.W. Miller crystal radio that was made in the fifties. I was fortunate to find ...

  • Wideband Active Rod Antenna

    2017-09-13 01:07:5062

    A J309 Siliconix FET feeds a 2N5109 in a wideband RF amplifier configuration. A relay is used to bypass the amp lifier in the transmit mode (if desired...

  • Low-distortion 1.6-30mhz ssb driver

    2017-09-13 01:00:1565

    The amplifier provides a total power gain of about 25 dB, and the construction technique allows the use of inexpensive components throughout. The MRF47...

  • Input-buffered-mixer

    2017-09-12 23:18:1660

    A high signal-to-noise ratio is important in signal construction and combination. The HA-5147 aids in lowering overall system noise and thereby raises ...

  • 2N4401-2N4403 Connection Diagram

    2017-09-12 23:06:5561

    This project uses a microcontroller programmed with software that is posted on the Gerns-back BBS at 516-293-2283 as part of RUNABOUT.ZIP. The robot ca...

  • Electronic bongos

    2017-09-12 22:12:0760

    This circuit consists of twin-T sine-wave oscillators. Each oscillator has a filter in the feedback loop. If the loop gain is greater than unity, the c...

  • Fuzz box 5

    2017-09-12 22:10:0260

    Transistors Q1 and Q2 amplify the incoming signal, and the gain is such that the input will overload when used with an electric guitar. RVl adjusts the...

  • Novel loudspeaker coupling circuit

    2017-09-12 21:41:0061

    The ground side of the speaker is connected to the junction of two equal high value capacitors (1000 ?μf is typical) across the supply. The amplifier ...

  • Electronic-bird-chirper

    2017-09-12 21:26:5062

    Transistors Ql and Q2 form the two halves of a free-running multivibrator whose frequency is determined by the voltage across C8. That capacitor is cha...

  • Noise-limiter

    2017-09-12 20:30:1761

    This circuit is fed from the earphone jack of your receiver and goes to limiter control R6 and is then amplified by Ql: a common-emitter stage that has...

  • Noise limiter

    2017-09-12 20:30:0060

    This limiter improves signal-to-noise ratio. It is connected between the detector output and the audio input (if high impedance) or at some relatively ...

  • Homemade 4 Tube Radio

    2017-09-12 20:13:4364

    Whew! This one was a big job. I wouldn't recommendthis one for the beginner. Welcome to my 4 tube radio page. I suspectthat I won't be building a 5 tub...

  • Four channel synthesizer

    2017-09-12 19:48:3660

    This circuit will synthesize two rear channels for quadraphonic sound when fed with a stereo signal. The rear output for the left channel, is a combina...

  • Dave Schmarder'Crystal Set

    2017-09-12 19:27:0260

    Im glad I am numbering these sets, or I would be lost! #51 takes a step back from the ultra-litz wire that I used on my #50 set. Number 51 is a single ...

  • Active Antenna With Gain

    2017-09-12 19:23:4663

    The signal booster, built around a few transistors and support components, offers an RF gain of about 12 to 18 dB (from about 100 kHz to over 30 MHz). ...

  • Crystal Radio David's DX Driller

    2017-09-12 17:19:2561

    Hola Amigos, and welcome to another one of my crystal radio project pages. The name The DX Driller Thriller was suggested to my by a member of the Radi...

  • Fuzz circuit

    2017-09-12 17:16:1060

    It seems that guitar fuzz boxes have been around since the beginning of rock, and have seen little improvement over the years. This one is somewhat dif...

  • SW Regenereative Receiver

    2017-09-12 17:13:1761

    Circuit Notes Sensitivity and selectivity are the major concerns of ashort wave enthusiast when he looks up for a receiver. Commercialcommunications mo...

  • Active Antenna I

    2017-09-12 17:00:2765

    This circuit is designed to make a short pull-up antenna perform like a long wire antenna, while offering no voltage gain. The circuit boosts the recei...

  • Narrow band FM demodulator

    2017-09-12 16:27:1162

    For FM demodulation applications where the bandwidth is less than 10% of the carrier frequency, an XR-J567 can be used to detect the presence of the ca...

  • Accurate-variable-gain-circuit

    2017-09-12 16:23:3960

    The circuit can use any general-purpose, low-offset, low-drift op amp, such as the OP-07. The differential signal from the bridge feeds an amplifier th...

  • Low Level Sounder Circuit

    2017-09-12 16:14:5560

    This is a simple low-level noise maker that`s ideally suited to certain alarm applications. When the sounder is located in another part of the building...

  • A Bipolar Regenerative Receiver

    2017-09-12 16:01:2262

    Contrary to what someradio experimenters think, a bipolar regenerative design can be madeto work efficiently. The major concern is the low input impeda...

  • Fuzz box 3

    2017-09-12 13:22:1960

    Q1 and Q2 form a voltage amplifier which has sufficient gain to be overdriven by a rela-tively low input, such as an electric guitar. The result is tha...

  • Top Octave Generator Circuit

    2017-09-12 13:12:5260

    Using an MK50240, this circuit produces 12 top octave tones. The input and output lines can be divided using a binary divider IC to obtain the lower no...

  • Chug-chug

    2017-09-12 11:49:4160

    A CA3240 dual MOSFET-input device is used as a white-noise source. Op amp IC2 is used as a driver stage for the push-pull output stage formed by Q5 and...

  • Programmable-attenuator

    2017-09-12 10:52:4960

    This circuit performs the function of dividing the input signal by a selected constant (1, 2, 4, 8, etc.). While T, Z, or L sections could be used in t...

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