This circuit was found in the June 1995 Electroics Now magazine. The relay should be a sensitive type with up to 100 mA trigger current.
This circuit uses a 555 (according to the diagram) to generate 50 ms tone bursts at a frequency of 1.5...
This circuit was found in a 1967 RCA documentation. The components are of the time. The circuit...
Found in US documentation, this circuit changes the waveform and phase of a sine signal. The...