This circuit was found in the July 1986 issue of Radio Electronics magazine. The circuit has a loudspeaker warning system. The sensor is the ceramic capacitor C1 which acts as a transmission line.
This circuit is from a Fairchild digital clock module shown in the March 1977 issue of Radio...
Found in an Electronic Design from the 90s, this circuit modifies the phase of a signal in 8...
Any TTL inverter can be used in this circuit. We found it in documentation from the 80s, but it...