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.
This time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The...
Found in a 1970s documentation, this circuit has a flat response from 15 Hz to 130 kHz. Modern...
This circuit can provide both positive and negative voltage outputs from 2 to 12 V with current up to...