DOEPFER A-178 Podręcznik - Strona 8

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A-178

Theremin

8. Appendix

On the board a trimming inductor resp. trimming

potentiometer is available with which the offset can

be adjusted internally. Use it if, for instance, you

connect a different antenna, and find that the front-

panel control 1 can't adjust the offset sufficiently to

reach the null point, or if you want to reverse the

standard polarity of the theremin module, and change

its response so that it works on the falling edge of the

internal resonanct hf circuit (and thus produces a

lower CV the closer your hand gets to the antenna).

Version 1:

The diagram on the right side shows the layout of the

A-178's printed circuit board version 1. The trimming

inductor is encircled.

Versions 2 and 3:

For the versions 2 and 3 the circuit has been modified

and the inductor is replaced by a trimming potentio-

meter. For version 2 it is labelled "Frequency Offset"/

P5 and located behind the offset front panel control.

For version 3 the potentiometer is labelled P3 and

located between the antenna socket and the offset

front panel control (close to the capacitor labelled "C1

150p").

System A - 100

The different pcb versions can be distinguished by the

pcb printings:

V1: no version imprint

V2: imprint "Theremin Controller Version 2 / 1998"

V3: imprint "Theremin A-178

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