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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.
 

daviddoria

New Member
i'm not sure what the max timing is....

somone let him know if you can use a 555 setup in monostable mode?
 

bogdanfirst

New Member
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
 

Gene

New Member
Would it be better to stop the charger based on the condition of the battery being charged rather than on time?
 

jriofrio

New Member
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.
 

gunny

New Member
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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