The configuration shown is from a Texas Instruments optoelectronics manual. The circuit can be implemented with any phototransistor and the BC548 can be used for the bipolar. The supply voltage depends on the application.

The configuration shown is from a Texas Instruments optoelectronics manual. The circuit can be implemented with any phototransistor and the BC548 can be used for the bipolar. The supply voltage depends on the application.