Doepfer A-130-8 Octal Linear VCA / Voltage Controlled Mixers

The A-130-8 contains eight linear voltage controlled amplifiers (VCAs) and three Sum/Mix Outputs. Lots of VCAs in a small space!

Each VCA features a control voltage input (CV), a signal input (In) and a signal output (Out). The signal inputs are able to process levels up to 20Vpp without clipping. Each CV input is equipped with a trimming potentiometer that is used to adjust the sensitivity of the CV input in question. In the factory the module is adjusted for the CV range 0...+5V but can be re-adjusted by the user for other control voltage ranges (e.g. 0...+10V).

In addition three mixers are included:

• the socket labelled "1-4" outputs the sum of the VCAs 1-4,
• the socket labelled "5-8" outputs the sum of the VCAs 5-8,
• the socket labelled "1-8" outputs the sum of all eight VCAs.

The amplification range for each single VCA is 0...1. The signals of the sum outputs have a lower amplification to avoid distortion.

The VCAs and mixers are fully DC coupled, i.e. the module can be used for the processing of both audio and control voltage signals. The control voltage and signal inputs can be normalled by means of small solder pads.