Created: Nov 25, 2014
No description available.
The door opener derives its power from a 9-V battery. A momentary-contact switch, S2, is provided in the event that manual opening and closing is required. Relay RY1 is a 9-V type and relay RY2 is a 117-Vac latching type, which automatically latches with the first bust 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. That, in turn, causes RY1's contacts to close, thereby energizing RY2 (closing it s contacts), and operating the garage door motor.