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November 11, 2013 AT 8:51 am

Battery Pack Load – simple circuit to keep USB battery packs from going into ‘sleep mode’

Battery Load Pulser6

Battery Pack Load.

I purchased a cheap USB power pack, thinking it would be ideal for powering small projects.  But it automatically shuts off if the device isn’t drawing a lot of power, since it’s meant for charging cell phones. Here’s a 2 transistor circuit I built this morning that keeps it on with very little battery drain by using brief pulses.


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