The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2 should have close resistances in operation.
The ZN414 integrated circuit consists of a complete radio from the 1980s. This single receiver...
We find this circuit in an old documentation, but it can be implemented with modern equivalent...
Using this circuit a low current switch can be used in the control of heavy duty loads, powered...