With this circuit it is possible to select transistors and their compliant test. Or circuit consists of an oscillator. Or transformer of the type found in old transistor radios.
This simple transistorized radio was found in a Japanese magazine from 1960. The phone must be...
This circuit counts from 1 to 10 or 0 to 9 using as indicators common LEDs. The circuit can be...
Found on Popular Electronics from 1969, this circuit can be implemented with components that are...