This 4-waveband converter circuit was found in Radio Craft September 1948. The power supply is not given, but the supply voltages are indicated.
This circuit can control the power from 0 to 70% of the maximum power on a load. The circuit was...
This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that...
This tone control was obtained from the CA3140 datasheet, originally created by RCA. The CA3140...