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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Mar 25 2014 :  5:20:57 PM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Honestly, what's wrong with following the instructions on the circuit page? That's what all those notes are for. They tell you how to adjust the circuit. While a capacitor will do the job, it can't simulate the weird inverse resistive load of a lead acid battery. Stick a battery on the circuit, connect up a voltmeter, and adjust the pot until the LED lights solid at the voltage you want the battery to charge to. The LED will begin to blink as you approach that voltage.
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Mar 25 2014 :  7:16:38 PM  Show Profile  Reply with Quote
It looks like he has faults with the circuit he has built, and it might be far safer to ensure it's working properly first, before he connects a battery!

Can you explain the 'weird inverse resistive load of a lead acid battery'? I was taught that its equivalent circuit is a voltage source equal to its EMF, in series with its source resistance. Nothing inverse about that.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 25 2014 :  7:21:38 PM  Show Profile  Reply with Quote
Is it okay that the only output of the original circuit is 9V without battery yet?

When the charger reaches the right amount of voltage, i will turn R2 to min or max? Thank you.
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Mar 25 2014 :  7:30:15 PM  Show Profile  Reply with Quote
I have explained it all before. Go back and re-read it.
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