We found this circuit in the February 1989 issue of Radio Electronics magazine. The selectors are BCD programming switches. The circuit is CMOS.
This VCA was found in the July 1988 issue of Radio Electronics magazine. It uses an OTA op amp and...
Found in US documentation, this circuit changes the waveform and phase of a sine signal. The...
Found in an American amateur radio documentation by the name of “antennascope” this circuit is...