This circuit is from 1999 documentation. The integrated circuit used is not very common today. Both transistors are used if the motor current is greater than 500 mA.
This is one of the possible triac power control configurations using as a trigger element a...
This circuit is from a 1976 Motorola power semiconductor manual. In it we have the optical...
This circuit for generating precise reference signals was found in the April 1973 issue of Radio...