Elektor Team
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Daylight-resistant opto-isolator

Based on a Labs project | October 2011 | Find it here
Daylight-resistant opto-isolator
Many X- Y plotters, particularly the DlY type, have, for all sorts of reason, no protection against incident light, so that the phototransistor in the opto-isolator can not differentiate between the light from the associated LED and daylight. The circuit shown here offers a solution to this problem.
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