This VCA was found in the July 1988 issue of Radio Electronics magazine. It uses an OTA op amp and has its gain adjusted by the voltage at the gain input.
Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz....
Schmitt Triggers convert a signal of any waveshape in square signals or pulses. The circuit shown...
This amplifier is from a 1990s Linear Technology component manual. The circuit requires...