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Rejuvenating Dry SLA batteries

I had some dead 12v 12Ah batteries from an APC smart ups 1000 that were quite old (md 2009) and very dry. I have replaced them with a set of new 18Ah batteries. I thought I would try my hand at getting these old batteries going again. One battery was showing ~12 volts...

KiCAD Footprints and Symbols

Decided to learn how to build some footprints, symbols and 3D models in Kicad so I used a HC-05 Bluetooth module and it’s chips as a template that was not in the default list using the chips datasheets, the TFBGA96 8x8x0,65mm main chip and TFBGA48 6x8x0.80mm...

EC1204 – AT89S52 and DS1302 based LED Clock

I built the 1204 Kit and it not working, so lets figure it out Physical all the joints seem to be good and test out fine at89s52clockDownload Diagnosis Circuit schmatics EC1204BDownload Checking the AT89S52 Verifying the program I the AT89S52 in an EEPROM programmer...