This bistable with two SCRs was found in the Radio Electronics magazine of June 1969. The circuit has a supply voltage according to the controlled load.
This timer with an externally triggered neon lamp was found in Radio Electronics magazine from...
This circuit can be powered by a solar cell. The circuit is from a 1991 documentation having a...
This circuit can use 20 to 100 mA relays with a general-purpose transistor such as the BC538. The...