This circuit was found in old American documentation. Transistor is general purpose and coil rated is for 1.5 MHz. Wind 50 + 50 turns of wire 28 onto ferrite rod for 1 MHz.
Suggested by a Popular Electronics from the 90s, this circuit triggers an external load, relay or...
This circuit was found in a 1980s American documentation. Operational amplifiers are from that...
The SN76477 integrated circuit of the 1980s was a great success as a sound effects generator. Many...