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I m trying to build a charger circuit for a 12V 7Ah Sealed Lead Acid Battery. I found this circuit online and it uses 15V-0-15V 1A Transformer as AC input.

Circuit Source

I have a 15V-0-15V 2A Transformer and can I use it with this circuit without any modification?

enter image description here

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  • \$\begingroup\$ The author of this schematic must have been drunk when he made it - there is a 100 ohm resistor in series with the battery (1/2W ie max 70mA before it hits max power!). \$\endgroup\$ – user1890202 Mar 3 '17 at 16:08
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A transformer that rated to supply more current is not usually going to be a problem. The one recommended is 1A and you have a 2A transformer - 2A means it is capable of supplying 2A if the load demands 2A.

As an extra bit of advice, are you aware that the charge current is probably limited to a few tens of mA. Also, the circuit diagram and parts list in the link do not totally match - this always makes me nervous and I would sueest some form of simulation first.

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  • \$\begingroup\$ i saw it now looks like zener diode value listed and in diagram are different. can you suggest any reliable and tested charger circuit please? \$\endgroup\$ – lasita Sep 28 '15 at 11:28
  • \$\begingroup\$ Sorry, I've never had a need to charge a battery with a home made circuit. \$\endgroup\$ – Andy aka Sep 28 '15 at 13:37
  • \$\begingroup\$ If it's a car battery they usually charge to 14.4V trough the alternator, since this is a home made charger I would suggest a safe 12.6V for charge. \$\endgroup\$ – Marcelo Espinoza Vargas Mar 3 '17 at 19:25

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