This circuit was found in Philips documentation from 1967. The components are of the time, being transistors like BCY38 for TR1, BC108 for TR3, and others depending on currents.
Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors...
This circuit was found in an Electronics World of 1968. The transistor can be any general purpose and...
This power source was found in a 1968 Electronics World. The transistors are from that time. The...