This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a company 567 which is still a common component.
This continuous wave transmitter (CW) can send signals in the 30 to 100 MHz band, depending on the...
This is one of many twin-T oscillator configurations that can be found in this section and on this...
Found in a 1980s American documentation, this circuit inhibits ignition. The circuit is valid for...