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Automatic 9 Volt NiCd Battery Charger - BR1 can be a bridge
rectifier or four diodes (10A) with a 100 PIV rating. A 10,000uF/50V
electrolytic capacitor completes the filtering of the 28.8V. Yep, C1
is a real clunker. You can use larger if you like, just watch it when
you power up. Without a 'power-up' delay circuit of sorts it will
probably blow-up the 723 if the capacitor (C1) is too-large…. [Tony
van Roon's circuit]
Automatic AA Charger - Rechargeable batteries are very popular
for use in all sorts of devices, especially those requiring a high
current. The most common type of cell is the AA or penlight and
although thousands have been sold, there are very few low-cost
chargers to keep them in tip-top condition. Most of them simply charge
them at the slow rate and never turn off, you have to
remember....(schematic diagram added 2/07)
Battery (NiCad) Rejuvenator - Don't throw away those seemingly
un-chargeable, rechargeable batteries; they could very well be brought
back to life with the aid of this simple circuit ….(Tony van Roon's
Tony van Roon) [Tony van Roon's circuit]
Battery Charger Takes on Two Roles - 01/01/98 EDN-Design Ideas The NiCd and
NiMH battery charger in Figure 1 applies a battery fast-charge controller IC in a
way that not only provides peak-voltage fast-charge termination--as IC was
designed to do--but also precisely regulates charge current. The design also
features maximum-temperature backup shutdown. Efficiency exceeds 90% at a VIN of
14V.... [Design Idea by Thomas A Somerville, Motorola SPS, Tempe, AZ]
Battery Charger with LM317 - LM317 regulator is used to regulate the voltage
and current for this circuit. This battery charger should be used only for Ni-Cad
cells. Other type of batteries (li-ion, NiMh, Lead and Li-ion polymer) needs
special care so it cannot be used. …(electronic design added 07/07/07)
Battery Chargers Indicates Rate of Charge - 05/25/95 EDN-Design Ideas A
single LED indicates wher battery Chargers s delivering a trickle charge or a
fast charge, Circuit designed to charge2-14 cells.… [Design Idea by Larry Suppan,
Maxim Integrated Products, Sunnyvale, CA]
