This circuit uses a power component that is not common today, being recommended by Motorola in the 90's. Note the need for symmetrical power supply.
This 80's circuit uses a germanium transistor like the AC121. The circuit has an output...
This circuit is from the Motorola Linear Databook of 1990. The circuit controls a Triac from a...
I found this circuit in a Popular Electronics from 1992. The circuit shows how we can receive...