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augustin87r
Apprentece
Romania
9 Posts |
 Posted - Jun 05 2006 : 6:39:11 PM
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Dear Mr.Aaron,
I built the car battery charger following the schematic on your site.Instead of the LM301 Op Amp i used LM741 Op Amp.With the LM301 the red led would not function properly,it wouldn;t light at all. It is said there : " When the battery is fully charged, the circuit switches off and lights a LED" . When i connect the battery,my red led is off at the beginning,but after a few mins it begins to light very fadely,as the battery charges,the led shines brighter.I guess this is a sign of the progressive charge of the battery,right? I'm asking you this because i expected the led to light suddently when the cycle has finished. Why am i asking this? Because i want to know if the following statement remains valid in the conditions described above:" The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging."
Please enlight me.
Best wishes,
Augustin
thank you for your patience to read my topic |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Jun 06 2006 : 10:04:57 AM
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I don't think the 741 is a replacement for the 308.
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augustin87r
Apprentece
Romania
9 Posts |
Posted - Jun 13 2006 : 11:38:10 AM
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Ok, so i'll try the 308 again.But how can the current from the charger stop if the schematic doesn't have a thyristor?
thank you for your patience to read my topic |
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augustin87r
Apprentece
Romania
9 Posts |
Posted - Jun 14 2006 : 03:22:51 AM
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Now i figured out how the circuit works without a thyristor.LM308 analyses the voltage of the battery and the output of LM308,pin 6, sends the information to LM350 and commands the voltage sent to the battery
thank you for your patience to read my topic |
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Questions about the car battery charger
