This circuit was found in a 1966’s American publication. What it does is to receive a pulse and keep it for intervals of up to 1 minute at the output.
We found this circuit in an old documentation. The operational can be of any type and the...
Found in a 1990s Motorola documentation, this circuit aims to protect a triac that drives an...
This very simple continuity tester uses a small 1.5 V lamp (type used in flashlights). Can be...