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Led Low Battery Indicator?

al heeley

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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)

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A common one uses the LTC1440 comparator http://www.discovercircuits.com/H-Corner/9v-batmon.htm

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