al heeley Posted January 30, 2009 Report Share Posted January 30, 2009 Anyone know where I can find a schematic to add a low-battery LED warning light into a guitar or a stompbox? Either a separate warning light coming on when battery falls below a certain voltage, or ideally getting an existing LED indicator in the circuit to start flashing when critical voltage is reached? (9V in this case) Quote Link to comment Share on other sites More sharing options...
mammoth guitars Posted January 30, 2009 Report Share Posted January 30, 2009 A common one uses the LTC1440 comparator http://www.discovercircuits.com/H-Corner/9v-batmon.htm Quote Link to comment Share on other sites More sharing options...
al heeley Posted January 30, 2009 Author Report Share Posted January 30, 2009 That's perfect - many thanks! Quote Link to comment Share on other sites More sharing options...
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