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Synthesizer PCBs |
Synthesizer Printed Circuit BoardsTH-102 “El Cerrito” 2206-based Voltage-Controlled OscillatorAnother project from Thomas Henry’s circuit-packed book, An Analog Synthesizer for the 21st Century, the TH-102 is a very versatile VCO based on the Exar XR2206 VCO chip. One unusual feature is the “Skew” waveform modulation that allows you to morph the triangle wave to a +1 octave ramp wave under voltage control. If the Sine wave output is selected, the Skew feature will morph the waveform from a Sine to a +1 octave Ramp-like wave (with s-shaped segments). Check out the graphic below for a better idea of the unusual waveforms available from the El Cerrito.
The LFO range goes from 0.05Hz (20 sec/cycle) to 1.63KHz, and the audio range goes from 0.5Hz (2 sec) to 16.2KHz. Great range and a buncha waveforms. While working with our prototypes, we've figured that it is possible to get three octaves of tones from the TH-102 — simultaneously! If you turn the Skew control all the way up, the Tri/Sine output will sound one octave up from the “fundamental” note. Since the Pulse wave is derived from the Tri/Sine, it will also be one octave up. The Rampoid and Square waves will be at the “fundamental” tone, and so will the Pulse suboctave. And finally, the Square suboctave will be one octave below the “fundamental” tone. The Tri/Sine and the Pulse will change octaves depending on the setting of the Skew control, as will the Pulse suboctave. All sorts of fun! The PCB is available for do-it-yourselfers. It is not difficult to build compared to other synthesizer modules, but Magic Smoke does not recommend this for your “first bulid”.
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Specifications and prices are subject to change. |
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© 2006-2009 Magic Smoke Electronics |
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