Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per second. The transistor can be replaced by a modern equivalent.
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...