Making a super-simple NiMh charger.
Added 2017-05-03 20:47:46 +0000 UTCI cobbled this very simple charger up to charge 5 small NiMh cells at once. The circuit is not really suitable for lithium cells as it will constantly trickle current.
Comments
I would have calculated the resistor value using the minimum voltage of the cells instead of the maximum voltage. Then you'd get the calculated charging current with the cells fully discharged, tapering off as they charge. Using the max voltage, you get the calculated current with fully charged cells, and even more when they're discharged.
John Rehwinkel
2017-05-18 16:13:06 +0000 UTCThanks
2017-05-04 21:58:45 +0000 UTCThe two sizes i tend to use are 0.7mm and 1.2mm, but some tasks like surface mount components benefit from the very thin solder.
Big Clive
2017-05-04 21:51:41 +0000 UTCAlways like watching you soldering and hopefully improve mine. What size solder do you use? Dave Jones advocates about .4mm but you seem to use thicker stuff. Can you comment on that please.
2017-05-04 21:05:41 +0000 UTCA trick I was shown for when spaghetti is not sliding easily is a squirt/few drops of isopropanol. Magic.
L. Brait
2017-05-04 13:45:47 +0000 UTCThis style of trickle charger is only suited to NiMh or NiCd cells. It would charge the lithium cells but would potentially overcharge them if they weren't removed when they reached their maximum voltage. You should be able to buy some LiFePO4 cells on eBay. They rely on the higher cell voltage to drive the LEDs directly.
Big Clive
2017-05-04 13:32:17 +0000 UTC
