This is the old name given to flip-flops or biestable multivibrators. In fact, this is a 1967 Ferranti circuit, triggered by a light sensor.
This is the basic configuration of an operational amplifier as a current regulator. We found it in...
This traditional dimmer configuration with SCRs, but with full wave control was found in a 1988...
In this circuit from a 1991 publication, we can use the 2N2646 unijunction transistor and the...