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 Help: Why is R2 3K on the battery charger?
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Joe1211
New Member

3 Posts

Posted - Jun 01 2006 :  07:26:54 AM  Show Profile  Reply with Quote
i have been doing a project on battery charger, so happen to saw http://www.aaroncake.net/circuits/charger1.htm , may i know why R2 resistor is 3k? and why must is be 3k?
Dear aaron, reply me soon
THX



Edited by - Aaron Cake on Jun 01 2006 09:04:13 AM

Aaron Cake
Administrator

Canada
6718 Posts

Posted - Jun 01 2006 :  09:10:34 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
I edited the title of your post to better describe the content. Just posting "help" doesn't work very well since it does not describe what the post is actually about.

R2 sets the output of the voltage regulator. It is 3K to provide the approximately 14V needed to charge a battery.

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Joe1211
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3 Posts

Posted - Jun 01 2006 :  09:21:10 AM  Show Profile  Reply with Quote
thx for replying, then what is the use of C1, C3 ?


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Aaron Cake
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Canada
6718 Posts

Posted - Jun 04 2006 :  10:33:29 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Both are filters to prevent the circuit from oscillating. I don't know the exact purpose of C3 since I don't have the datasheet for the 741 op-amp handy.

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