Found in a 1969 British publication, this circuit uses a regenerative switch with two transistors to produce pulses that depend on C1. The relay must be in accordance with the supply voltage.
This circuit can be applied to several logics. The circuit is from an Electronics Now from the...
This circuit was found in a Popular Electronics of the 1990s. The sensor is a rotating mechanical...
The transistor in this circuit can be the BC558 and the capacitors must be ceramic. Crystals from...