Theremin moduleA module for generating a variable control voltage by approaching the hand to an antenna. The range is approx. 30 cm. In addition, a gate output is available which responds from an adjustable output voltage (threshold) to trigger an envelope generator or to control a VCA (on / off) for example. To replicate the original theremin, two A-178s, one VCO (eg A-110) and a linear VCA (eg A-130 or A-132) are required. One A-178 controls the pitch (VCO), the second the volume (VCA). However, the A-178 can also be used to control other functions in the A-100 (For example: filter frequencies, modulations, tempo, settling time, etc.).
Offset (rotary control)
2 x CV output
2 x LED (for CV display positive / negative and zero adjustment)
Threshold (gate threshold)
Voltage range of the CV output - depending on the setting of the offset controller from a maximum of -10 V to 10 V.
Gate output switches between 0V and about 10V
Power requirements: 60mA (12V) / -20mA (-12V)
Width: 8 HP / 40.3 mm
Depth: 40 mm (measured from the back of the front panel)
This is a fun yet practical module to add to any A100 modular setup. As well as building classic Theremin style pitch control patches, it's great for modulating other things too. For instance I found it great fun to run the antenna horizontally along the width of the keyboard, and then while playing basslines on the keys you could modulate the filter frequency by changing the angle of your hand! There's a lot of fun to be had with this surprisingly cheap module.
The A-178 Theremin is a really good little unit - you can control the pitch of your modules with the CV control, PLUS a gate output which you can control using the threshold. I've had a LOT of fun with it in conjunction with a Doepfer A-151 sequential switch + Pressure Points. EPIC!!!
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