This single trigger circuit has been indicated for photography applications. The circuit is from a 1964 Electronics World. The transistor is general-purpose and the SCR can be of any type.
This useful power supply was found in an 1985 Italian publication, but can still be assembled...
This dimmer for 12 V incandescent lamps was found in a 1966 General Electric documentation. The circuit has...
With this circuit any number of 4017 integrated circuits can be connected in series. The circuit is...