The purpose of this circuit is to power a lamp or other appliance for a given time (30 minutes in this case), and then to turn it off. The purpose of this circuit is to power a lamp or other appliance ...
This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec., e.g. when accessing some dark place, without the necessity of coming back to switch-off ...