[sdiy] cv scaler

[PRCamann at aol.com]

>opamps are good
 for addition & subtraction of voltages (even many operands at once), and
 division/multiplication by fixed values<

They are called "operational amplifiers" because they were the heart of analog computers, doing summation, integration, and other mathematical operations.

For instance, the typical state variable filter is nothing more than an analog computer circuit for solving a second-order linear differential equation with damping and a forcing function.

Paul Camann