This simple continuity tester consists of an oscillator found in the 1983 Electronics Experimenter Special projects magazine. The circuit is powered by a single battery.
This is a commercial radio circuit for 1967 AM. It was found in Japanese documentation. The...
Using a dual 555 CMOS this very useful circuit on the bench was found in the July 1998 Electronics Now...
We found this circuit in a 70's factory documentation. The circuit formed L1 / L2 and C1 must be...