On 31/01/13 10:54, Chris Green wrote:
There are chips (can't remember the manufacturer, there is one major specialist) specifically for NiMh and NiCd chargers which detect the delta-V fully charged voltage step from the battery. There are also chips specially designed for charging LiIon of course.
'Intelligent' chargers (i.e. ones which detect delta-V) for NiMh and NiCD are so cheap nowadays that it's almost certainly not worth DIY except for one's own satisfaction.
Thanks - I had in the back of my mind something larger and more comprehensive than the usual 4-cell charger - something like 16 bays.
Ideally each one would be switchable to take all single cell types.
Somewhere, I have the circuit diagram for a dry cell depolariser too, hence the 'all', so each bay could be switched to three modes.
But in the meantime, my enquiry was just so I could know how to set the timer for say, 4 NiMH cells - I have 2,000 maH, 1,3000 maH, 1000 maH in AA NiMH cells alone, and I have AAA, C and D cells as well.
As an aside, I remember the days when some people still took their wireless accumulator in to the local garage, electrician or in my memory, cycle shop, to get it recharged. I wish I still had my old (mains supplied) walnut veneered wireless, which ended its days upside-down (sagging filament in one of the valves) in my workshop.