This well-designed bistable circuit was found in a 1970s documentation. Transistors can be current types and germanium diodes. The voltage depends on the logic used and can be made with 5 V.
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In the figure we have a very sensitive touch switch circuit. A touch of the sensor causes the...
This timer counts down the times until, at the end, it activates a relay. The programming time is...
This filter is from a 1977 publication. The circuit employs three 741 or other operational...