Found in documentation from the 1970s, this circuit uses an oscillator and a display to warn of speeding. The circuit applies to cars with contact breaker.
We found this crystal AM radio using a germanium diode in a Japanese magazine in 1967. The circuit...
The figure shows a white noise generator circuit that uses a transistor junction to generate the...
This circuit was obtained in an American documentation of 1964. The transistors are of the time....