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4 Feb 2013

555CCLAB

Kennith needed a 1A constant current lead-acid battery charger for his HAM radios so he writes:

Since the SLAs are relatively small, and I only need them charged between radio outings, I opted to build a 1A constant current charger, based on the 555 Battery Charger which won first place in the 555 Design Contest Utility category. Using a 555 is a rather clever way to get two comparators and a Set-Reset latch in a single 8DIP package, which is needed for the high and low trip points. The major difference between my design and Mike’s is that instead of using a relay like him, I use an LM317 as a constant current source to limit my batteries charge rate.

555 based constant current lead-acid battery charger - [Link]

One Response to “555 based constant current lead-acid battery charger”

  1. aercys Says:

    Thanks, its very usefull. Does it include overcharge protection?

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