Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

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Photosensor for robot follows the line (CB26018E)
This simple robot or motor control circuit using a photocell as a sensor was found in the magazine...
Light Modulator 741 (CB16810E)
This circuit uses an operational amplifier to modulate the light emitted by an LED with audio...
Transistor Monostable (CB19361E)
Equivalent transistors, such as the BC548, can be used in this circuit that we find in...