This timer for long time intervals is from the 1990 Motorola Linear Databook. The setting applies to other operational ones and component values are given below the diagram.
A touch in this circuit turns-on the lamp or the relay. Power supply is according the lamp or...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This circuit is from the 1977 GE semiconductor manual. The components used are uncommon today....