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.

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

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