This circuit is from Motorola documentation, but can be implemented with virtually any phototransistor and any general-purpose transistor. The supply voltage can also be changed.
Found in a 90s Popular Electronics this circuit has its gain given by R2. This component can be...
This circuit was obtained in an English publication of the 80's, finding applications in...
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...