Solenoid trip circuit works at battery`s end of life


Posted on Sep 11, 2012

This Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the solenoid in the original design worked fine as long as the battery was fresh but failed as the battery got into the middle of its life, even though sufficient energy remained in the battery to operate the solenoid.






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