(1) CONTROL SECTION: Operation and principles ^
1-14 VOLTAGE PROCESSORS
Figure 26 - Voltage Processors
1-14 VOLTAGE PROCESSORS (VP)
When using the output of the control wheel (or some other device) to control a specific circuit, the voltage processors are used to establish the control voltage which will be applied (within the range of the control wheel's output voltage).
Turn on the VCA2 switch and leave other controls at the normal setting.
Set Limiter (1) A to "5" and (1) B to "0" and then turn the Control Wheel back and forth. When a note is played, the volume of the sound will be determined by the position of the Control Wheel. In order to set the lowest volume level to be produced, turn the Control Wheel all the way towards yourself and then turn knob A counterclockwise until the desired level is obtained. These controls allow you to freely establish what sort of control voltages will be produced with an external -5V - +5V input signal. As you may have noticed, you can actually reverse the effect of the Control Wheel on volume changes merely by reversing the A and B knob settings.
Figure 27 - Voltage Processors voltages
As shown in fig. 27, when an external input voltage is applied to the VP, the VP output voltage will change linearly from the setting of Limiter B to the setting of Limiter A. When external control voltages are not applied to the VP (when no external inputs are connected), the VP acts as a regulated voltage generator. In this case, coarse adjustments of VP output voltage may be made with Limiter B, while fine adjustments may be made with Limiter A. The range of uses for the VP is very wide. Depending upon the settings of the two knobs, the VP may be used as a buffer amp, a phase inverter, or a power supply.