The Takaab 2VCA is an affordable dual linear voltage controlled amplifier in 3HP, based on the LM31700 chip. In contrast to our existing VCA-2180, the 2VCA has a near linear response, is pre-offset to be normally closed, and best of all there are two of them!
A positive voltage applied to the CV input will amplify any signal put through the 2VCA at more-or-less unity gain. So a +/-5V audio signal will be amplified to 5V if there is a +5V applied to the CV input. The 2VCA is DC coupled so it can be used to amplify voltages as well as audio signals.
We've compromised a little to allow for differences in power supplies while avoiding the need for the user to trim the zero-point on installation. This means with CVs under 0.5-1V it may not be too responsive, and conversely a 10V CV may amplify a 5V signal signal to slightly over 10 volts. This still makes for a nice responsive VCA with little setup time, at a great price.