This circuit is from a 1978 magazine Radio & Electronics Constructor, but it can be assembled with 1N4004 diodes and TIC106 SCRs for motors up to 1A. The transformer has a secondary 12 V x 1 A.
This is a very simple motor drive circuit with an LDR. The circuit simply powers a small motor. We...
This plug-in control was found in General Electric documentation from the 1970s. The SCR can be...
This circuit from an old 1978 publication uses germanium transistors but can be implemented with...