This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
The TTL 74123 integrated circuit consists of a monostable that can be configured to generate...
This constant current source from a 1980 publication can be used on a battery charger. Transistor Q1 may...
This circuit uses one of two D-type flip-flops available on an integrated circuit 4013. The...