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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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3rd July 2003, 05:35 AM
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| New Member  |  Very simple NiMH Charger.. Hi! So I wan't to create a simple 1/10 C charger for one of my power tools (a drill) and it is rated at 14.4V and 2200mAH so I should charge it at 220mAH then right? Is it as simple as just using a 24V powersupply with 1 resistor to get the correct current? And the resistor shuld be around 43 ohms (24-14.4/0.220) AND I guess it must be able to handle >2Watts.. Are my calculations correct? |
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3rd July 2003, 08:27 AM
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| Experienced Member  | This is the very simplest form of charger, however, as the battery charges, the current will decrease. I think there is a better solution on this datasheet: http://www1.jaycar.com.au/images_uploaded/LM117.PDF (I refer to the "50mA Constant Current Battery Charger" on page 17). Subsitute the 24 ohm resistor for 5.6 ohm (0.5W minimum). This should give you 223mA. |
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3rd July 2003, 09:28 AM
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| New Member | Thank you! I'll give it a try.... |
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