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Pseudorandom-Sequential Ring-Modulated Tone Generator – Circuit Schematic
Pseudorandom-Sequential Ring-Modulated Tone Generator
The circuit illustrated produces a short duration of rapidly-sequencing tones, invoking the stereotypical sonic imagery of a sophisticated computer, such as wou...
The 203 Theremin – Circuit Schematic
The 203 Theremin
The 203 Theremin utilizes Wien-bridge oscillators in a heterodyne configuration to produce an audible tone that corresponds to hand position. The instrument pro...
The Wien Bridge theremin – Circuit Schematic
The Wien Bridge theremin
This circuit is a basic theremin with only a pitch control. It uses the "heterodyne" technique, as did Theremin`s original instrument. Heterodyning is advantage...
The 145 Theremin – Circuit Schematic
The 145 Theremin
Since the publication of the type 144 theremin project article in September, 1998, many of them have been successfully constructed. As in the 144, and its forer...
Pro Co Rat Input & Output Buffers Guitar – Circuit Schematic
Pro Co Rat Input & Output Buffers Guitar
In some versions you don`t have the input buffer at all, and in some versions the buffer transistors have different biasing or different transistors. Some have ...
tube overdrive pedal – Circuit Schematic
tube overdrive pedal
That circuit is similar in concept to the BK Butler/Tubeworks Tube Driver. Since there is only a 9v supply, the tubes operate in "starved plate" mode. Preamp tu...
The Sound Square – Circuit Schematic
The Sound Square
On the face of it the design of a Sound Square is simple, all you need are several Infra red beams across an opening and when ever you place your hand in it you...
The Sea Song Project – Circuit Schematic
The Sea Song Project
An idea came to me while watching the waves coming in from Malaspina Strait during a storm a couple of weeks ago. What if a person could hear the sounds of ocea...
sound generator – Circuit Schematic
sound generator
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VU-meter – Circuit Schematic
VU-meter
Quad comparators, type LM339. A flyback DC converter Done. Buck converter Step-up converter Done. that would consume several comparators and maybe there would b...
Audio Schematics – Circuit Schematic
Audio Schematics
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DIY Test Equipment for Audio and Ham Radio Enthusiasts – Circuit Schematic
DIY Test Equipment for Audio and Ham Radio Enthusiasts
This neat device replaces the input transistors and associated circuitry on one TO-220 style device. I had some driver boards made by my printed circuit house a...
Phantom powered FET preamp cable with output buffer – Circuit Schematic
Phantom powered FET preamp cable with output buffer
This is a phantom-powered FET preamplifier built into a 1/4" guitar cable, similar to the one on the Tillman site. There are only a couple of parts to the ampli...
69 SFPR Schematic Telecaster Guitar – Circuit Schematic
69 SFPR Schematic Telecaster Guitar
I have a 69 Princeton Reverb which is labled as having an AA764 circuit. When perusing various web resources for Fender Amplifier Schematics.....
Ghost Effects and the proverbial Fuzz Face enigma – Circuit Schematic
Ghost Effects and the proverbial Fuzz Face enigma
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SWR Aural Enhancer Bypass – Circuit Schematic
SWR Aural Enhancer Bypass
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Dynamic Bass Boost – Circuit Schematic
Dynamic Bass Boost
A while ago I was doing some fairly trivial repairs on a Philips portable radio/CD/cassette player. It had a sticker on it claiming that this particular product...
Constant Voltage Speaker Measurement Circuit – Circuit Schematic
Constant Voltage Speaker Measurement Circuit
If there are more than some 5mV, reduce this offset value by experimenting with resistors (220K a good starting point) from testpoint Z (junction of R22/R23) to...
Guitar Hero – Circuit Schematic
Guitar Hero
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Bleep Labs Pico Paso – Circuit Schematic
Bleep Labs Pico Paso
It`s similar to the Atari Punk synth, aka Forrest Mims` stepped tone generator, but uses two triangle wave oscillators that can be combined or used separately. ...