This circuit was found in a 1970s General Electric documentation. This circuit already used an emitting LED. The circuit operates at frequencies from 50 Hz to 50 kHz with short pulses
This oscillator appeared in the September 1950 Radio Electronics magazine. The frequency is...
The SCR used in this 80's circuit depends on the load. The control is half wave and instead of the neon...
This relay shield was found in the October 1993 Electronics Now magazine. The circuit is powered by...