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 Power Supply
 Car Battery Charger		  New Topic  Reply to Topic
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RobinM
New Member

2 Posts
Posted - Nov 22 2011 :  11:44:36 AM  Show Profile  Reply with Quote
Dear electronic-friends,

I'm trying to charge a 12V, 90amp / hour battery with the "Car battery charger project", I've builded and tested the circuit but, have some problems:

1) the output voltage is immediately 14.5V (Charging voltage) without pushing on the button
2) My LED lights contineous up
==> so my push button has no effect

and it has to because later I want to replace the button with a transistor circuit to start the loading proces with a µController

could someone help me?

Thanks already for a reply

grtz Robin
(excuses for my language I'm a student from the Netherlands)

Aaron Cake
Administrator

Canada
6718 Posts
Posted - Nov 26 2011 :  10:22:15 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Op amp pins 2 and 3 reversed? D1 backwards? Have you checked all your connections?
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RobinM
New Member

2 Posts
Posted - Dec 17 2011 :  03:33:15 AM  Show Profile  Reply with Quote
Hi, i made the schematic work, but i've got another question, what's the reason for te resistor, 500E, above the voltage regulator (LM350)??

thqs for reply
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