This mixer with 20 dB gain per channel uses RCA's CA3048 integrated circuits. We found it in the July 1971 Radio Electronics magazine. The power supply does not need to be symmetrical.
This circuit was found in a 90s Popular Electronics. It uses a varicap that admits equivalents. The...
This two-microphone amplifier was found in a April 1961 Radio Electronics Magazine. The circuit is...
This circuit is tuned to produce pulses of 1.5 ms and 5.5 ms of separation for various settings with...