This triac circuit was taken from an article in the July 1970 Radio Electronics magazine. Note the snubber formed by R5 and C3 for controlling inductive loads.
This circuit activates a relay after a time given by C1 and R1. The circuit is from a Radio...
This circuit can be used as a control shield for microcontrollers of all types. The supply is made...
In this circuit, D.A. which is actually O. A. of an operational amplifier, which can be any type...