Standard 1 MHz Oscillator (CB9653E)

We found this circuit in an old American documentation. Transistors can be modern equivalents.

Basic Monostable with the 555 I (CB1295E)
This basic configuration can be found in a lot of articles on this site. In this case, the relay...
Light operated switch (CB6856E)
This circuit is from American documentation from the 1980s. The transistors are general purpose...
Bipolar Transistor Photo Relay (CB16105E)
The circuit is simple, as it uses only one transistor and a relay that can be MC2RC1 or MC2RC2,...