This circuit was found in Motorola documentation from 1969. The transistors are from that time. The pulses are 200 ns with 500 mA. Observe the high supply voltage.
The presented circuit produces the sound of a fireman's siren. In place of the output transformer with...
This is a commercial circuit for an AM radio with 4 transistors, published in a Japanese magazine in...
This circuit is from an October 1980 Radio Electronics magazine. The circuit indicates when the...