Found in Popular Electronics from the 90s, this circuit turns off an appliance at the end of the programmed time. The 12 V relay must have contacts according to the controlled current.
The integrated circuit used in this 1987 project is not very common these days. However, if found...
This circuit applies to other operational ones, other than the one indicated. The formulas next to the...
This amplifying stage is found in several circuits on our website. The coils depend on the...