To operate, switch S1 to position A. Adjust R2 of the transmitter to its mid-point. When light from the led is striking the solar cell, adjust R4 of the receiver until the receiver's led switches on. The led should switch off when the transmitter led is pointed away from the solar cell or its light is blocked. Switch S1 to B to select relay.

Page last modified on August 30, 2019, at 01:13 AM
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