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>> No.798392 [View]
File: 7 KB, 479x283, sensor2.gif [View same] [iqdb] [saucenao] [google]
798392

>>798387
Wouldn't the 2222 be wasting energy until the current though the collector reaches the switching current of the relay? I guess comparator would be more efficient.

Pic related must be a very similar circuit to this >>798328

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