This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit can use the 2N2646 for the UJT and the phototransistor can be of any type.
This stage is intended to receive modulated optical signals, using as a receiver a photodiode....
This circuit doubles the pulse rate produced by a digital TTL circuit. The circuit is from a 1976...
This voltage follower or amplifier with unit gain uses an unusual operational amplifier nowadays. The...