Linear photometer (CB7366E)

This circuit was found in a 1967 Philips publication. Transistors support equivalents and modern equivalents can be used.

Twin-T Oscillator 741 (CB16264E)
This circuit can be used as a source of signals for generators of different types, sirens, or...
Light-driven LED flasher (CB24663E)
This circuit is based on a 5 V LED flasher. We found it in October 1980 Radio Electronics...
Digital clock without digits (CB24514E)
This interesting circuit in which the LED display is circular imitating a common clock appeared in the...