This filter was found in an old publication from 1977. The circuit must use a simple two-voltage source and the components can be changed for operation at other frequencies.
This circuit (2009) has driver control through the RTS signal or in automatic mode through the...
This circuit is from a June 1953 Radio Electronics. It includes the modulation oscillator with a...
This TTL circuit has a well-known configuration, having been found in a Radio Electronics magazine...