Doepfer A-178 Handleiding

Doepfer Niet gecategoriseerd A-178

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doepfer System A - 100 Theremin A-178

1. Introduction

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. 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

A-178 Theremin System A - 100 doepfer

2. Overview Controls:

1 Offset : control for setting the null (zero) point

2 LEDs : LEDs to give a visual indication of the

voltage present at output "

3 LED : LED to give a visual indication of the

presence of a gate signal at output $

4 Threshold : control for setting the gate threshold

In / Outputs:

! Antenna : antenna input

", § CV Out : CV outputs (internally linked)

$ Gate Out : gate output

A-178

THER

CV Out

Gate Out

Antenna









➀

➁

➃

010

0 10

Offset

Threshold

Theremin Volt. Source

➂

doepfer System A - 100 Theremin A-178

3. Basic principles

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). The electronics within the

theremin measure this change in the following way:-

The signal from an oscillator (whose frequency can be

subtly adjusted with the offset control 1) is compared

with the signal in another oscillating circuit, whose

capacitor is made up of the antenna and an external

object like the human body. If the capacitance is

changed (by, e.g., moving your hand) the circuit’s

resonant frequency changes. This is measured, and

converted into a control voltage.

Depending on the oscillator frequency, we may hit

either the rising or the falling edge of the oscillating

circuit’s resonance - and thus produce respectively

either rising or falling voltage as the hand gets closer

to the antenna. The module is factory adjusted so that

as the hand gets closer to the antenna, the voltage

rises. This can be reversed if required, though.

4. Controls

1 Offset

Control 1 is used to adjust the null point, so that the

control voltage at output " is at 0 V, when the hand is

some distance away from the antenna (more than

about 30 cm).

H Because this module, like all theremins, is

very sensitive to fluctuations in humidity,

temperature changes, etc., it’s necessary to

check adjustment each time you use it.

In addition to the offset control on the front

panel, there’s also an internal trim inductor

for coarse adjustment of this offset fre-

quency - see appendix on p. 8.

Using this trim pot for coarse adjustment may

be necessary if, for instance, you install

another antenna, and it’s then no longer

possible to set the null point with the front

panel offset control; or you want to use the

falling edge of the circuit resonance, so that

the control voltage generated gets lower as

you approach the antenna.

Product specificaties

Merk:	Doepfer
Categorie:	Niet gecategoriseerd
Model:	A-178

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