This circuit with the NE602 was found in the February 1997 Electronics Now magazine. The NE602 integrated circuit is not very common these days.
This is a circuit with a period component that consisted of a voltage reference. The circuit is...
The critical components of this 1978 circuit are transformers, which, hopefully, can be obtained from...
We found this circuit in the March 1991 issue of Radio Electronics magazine. The integrated...