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Auto Shutoff circuit

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Queball

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:?: I have a battery that I need to charge for 7-8 hours. I would like to build a circuit that cuts the power after 8 hours. I would also be nice to be able to move between 5-10 hours of charge time. Does any one have a design for this? The input would be a standard US 110v outlet, the load is a 8.4v 600mAh Nicad battery pack.

thanks for you help,
Queball.
 
i'm not sure what the max timing is....

somone let him know if you can use a 555 setup in monostable mode?
 
what he means that you can generate a 60Hz frequency with the 555 and count the pulses with a 4040 counter and get the timing
 
Would it be better to stop the charger based on the condition of the battery being charged rather than on time?
 
auto shutoff

I guess a circuit that check when the batteries are full charged and then with a relay shut the power will be more efficent, rather that meassuring time....

use google.com to find the circuit, i have seen it, but i can not remember the site.
 
you might be able to use a comparator and a relay to turn on the input of your charging signal ..thay way when the potentional is met it will automaticly turn it off and visa-versa...
 
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