Door-opener


Posted on Oct 27, 2012

The door opener derives its power from a 9-V battery. A momentary-contact switch, 52, is provided in the event that manual opening and closing is required. Relay Kl is a 9-V type and relay K2 is a 117`Vac latching-type, which automatically latches with the first burst of current and opens on the second burst. The gate lead of the LASCR is not used; a light source triggers the LASCR unit into conduction, causing current to flow in the coil of the relay.


Door-opener
Click here to download the full size of the above Circuit.

That, in turn, causes Kl"s contacts to close, thereby energizing K2 (closing its contacts), and operating the garage door motor.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Multi Rocket Launcher
AM reciever with MK484
Shutter-speed tester
Led bar-dot level meter
Pulse-train-to-sinusoid-converter
Automatic timer switch with ua741
Simple Photoresistor Circuit
Joule Ringer 3
Bicycle Radio easy and cheap to build (April 1940)



Top