Found in a 1970 EEE, this circuit uses general-purpose transistors of the time. Transistors support equivalents and the ramp time ranges from 0.1 seconds to a few seconds, depending on C1.
This sensitive AM radio doesn’t need external antenna, picking easily local stations. The output...
This small FM transmitter circuit, using only common transistors, includes a mixer that allows it to be...
This circuit is from an old RCA MOSFET manual from the 70s. The circuit can be implemented with...