These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.
This circuit triggers a load that depends on the characteristics of the transistor when we touch...
This circuit was obtained from Popular Electronics of the 1990s. It makes use of a mercury switch that...
This circuit was obtained from Linear Technology documentation from the 90s. The circuit uses...