This is a lithium-ion charger for lipo batteries. circuit schematic shows configuration for charging single 3.7v lipo battery but voltage can be set to charge several batteries in series.. Here's what you need: an arduino board ; or a atmega168 or 328p chip and associated parts for the standalone version - see the schematic for details.. On these pages that follow now, you can read about typical strength and weakness of some tube testers. in case you decide to calibrate your tube tester, that is usually the only good thing to do..
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