Found in the July 1994 Electronics Now magazine, this circuit drives a relay up to 12 V depending on the power supply. The transistor can be general purpose.
For triggering high-powered loads connected to the power grid, nothing better than using TRIACs. For...
This tube circuit is from an 80's documentation. The filter is of the selective type and the...
This circuit was obtained in a 90s EDN. The components used are from that time. The voltage...