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System A - 100

Theremin

A-178

1. Introduction

Module A-178 (Theremin Voltage Source) produces

variable control voltage

which gets bigger the

closer your hand gets to its antenna.

You can use this control voltage in any modulation or

control process, and thus have access to an extra

system of real-time control in the synthesis process.

You use the Offset control to set the null point (zero)

of the control voltage output. Two LEDs give a visual

indication of the voltages produced.

The module also produces a gate signal at the

gate

output: the signal goes "high" as soon as a voltage is

sensed which is above the threshold set with the

Threshold control

. An LED gives a visual indication

of the presence of a gate signal.

This gives you the ability to produce a gate signal

simply by moving your hand.

A-178

Theremin Volt. Source

Antenna

Threshold

CV Out

Gate Out

Offset

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer Theremin A-178 1. Introduction A-178 Theremin Volt. Source Antenna Module A-178 (Theremin Voltage Source) produces a variable control voltage which gets bigger the closer your hand gets to its antenna. You can use this control voltage in any modulation or control process, and thus have access to an extra system of real-time control in the synthesis process. You use the Offset control to set the null point (zero) of the control voltage output.
PAGE 2
A-178 Theremin System A - 100 doepfer Controls: 2. Overview A-178 THER Theremin Volt.
PAGE 3
doepfer System A - 100 Theremin A-178 3. Basic principles 4. Controls The theremin acts as one plate of a capacitor and a human body as the other plate. Moving the hand towards and away from the antenna produces tiny changes in capacitance (so tiny that they’re measured in the picoFarad range).
PAGE 4
A-178 Theremin System A - 100 2 LEDs doepfer 5. In / Outputs The LEDs 2 indicate the state of the voltage at CV outputs " and §. ! Antenna 3 LED H LED 3 shows the presence of a gate signal at gate output $. 4 Threshold Using control 4 you set a threshold voltage for the CV output, above which a gate signal will be produced at output $. Use socket ! to connect the antenna.
PAGE 5
doepfer System A - 100 Theremin A-178 6. User examples Theremin module A-178 provides a further source of control for real-time sound manipulation and creation (so see also the suggestions in the manual for the Foot Controller, module A-177).
PAGE 6
A-178 Theremin A-178 THER Theremin Volt. Source Antenna A-178 THER Theremin Volt. Source Antenna Offset CV Out 0 0 0 + 10 Gate Out In the patch in fig. 3, just a quick movement of one hand can control both the frequency of the VCO, and a rapid repeat of the envelope controlling the VCA, and thus produce tremolo. 10 - Threshold doepfer Offset CV Out 10 - Gate Out System A - 100 0 + 10 Threshold VCO VCA CV A-178 fig.
PAGE 7
doepfer 7. System A - 100 Theremin A-178 Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. A-178 THER Theremin Volt. Source Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system.
PAGE 8
A-178 Theremin System A - 100 8. Appendix On the board a trimming inductor resp. trimming potentiometer is available with which the offset can be adjusted internally.