This circuit for incandescent lamps was found in the February 1972 Radio Electronics magazine. The triac is rated according to the lamp power and the sensitivity adjustment is made in R1.
The purpose of this circuit is to excite a TTL input with lz pulses. The phototransistor can be of...
This circuit was found in the RCA Power Transistor manual from the 70's. The circuit uses power...
We found this circuit in a technical documentation for the National Semiconductor LM3909. The...