This circuit, to control air conditioning systems, was found in July 1984 Radio Electronics magazine. The circuit is for old types of the time that did not have microcontroller control.
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...