This simple digital circuit tester can work with TTL technology when powered by 5 V and with CMOS when powered by voltages from 3 to 15 V. The circuit provides LED indications and uses current ICs.
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....