XTyna

Vactrol Double VCA

This is a double VCA made with vactrols. It's the same as XDYNA without the distortion section. The signal in is usually audio or cv, INs are DC-coupled. "Offset" potentiometer is used as the initial gain of the VCA stage. Polarity led is really useful to check for CV in wave.

VCA1's IN is normalled to VCA2's IN, VCA1's CV is normalled to VCA2's CV, so a different response curve creates, more exponential.

VCA stage is made with a high quality vactrol to obtain a different "flavour" respect to the VCAs on the market.

You can feed a envelope in CV in between 0 and +5V, in this case the result is between 0 and unity, or if you prefer a bipolar signal between -10V and +10V, the "Offset" potentiometer can manage also this, the center position means it adds 0V.

Built with high quality components (1% metal film resistors, bicolor led, aluminium panel with silver finish, ...) this double VCA is ideal in any setup.

http://www.qosmomodular.com/xtyna/