Unijunction rectangular generator (CB9248E)

Found in an Electronic Design of 1964, this circuit operates with control voltages from 0 to 12 V determining the duration of the pulses.

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Photoelectric Relay (CB18048E)
The circuit presented is from a 2006 documentation. It can turn a set of lamps on or off when...
Phototransistor TTL Trigger (CB15631E)
In the figure there is a configuration that uses a 4-input trigger NAND port, such as 7413, 7414,...
CMOS Crystal Oscillator (CB5113E)
This circuit appears in other articles in this section and even in other sections of the site....