Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the FET can be equivalent and the operational is general-purpose.
This circuit is from a publication from the 50's. Inductive components are critical, and...
This simple two-transistor circuit used transistors from the 60s, having been found in a...
This circuit uses an oscillator that generates a signal of approximately 1450 kHz to test...