Doepfer A-179 Light Controlled CV Source (no longer available) - Manual

doepfer System A - 100 Light Ctr. Volt. Source A-179
1
1. Introduction
Module A-179 (Light-Controlled Voltage Source)
produces a variable control voltage which depends
upon the illumination intensity of a light sensor
(photo resistor). One can use ”active” illumination (e.g.
flashlight, mini laser) or ”passive” illumination
(darkening by making a shadow, e.g. with your hand).
The resulting control voltage is available in normal
and inverted form. You can use these control voltages
in any modulation or control process, and thus have
access to an extra system of real-time synthesis con-
trol.
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.
Instead of the internal sensor an external remote
light sensor may be used.
A-179
Light Ctr. Volt. Source
ext.
Sensor
Threshold
+
-
CV
Out
Gate Out
Offset
Light
Sensor
+
-
Inv. CV
Out