This circuit was suggested by the Texas Instruments optoelectronics manual. The same configuration can be used with other phototransistors and the transistor can be the BC548. The supply voltage can be between 9 and 30 V.

This circuit was suggested by the Texas Instruments optoelectronics manual. The same configuration can be used with other phototransistors and the transistor can be the BC548. The supply voltage can be between 9 and 30 V.