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 Automatic 12V Lead Battery Charger		  New Topic  Reply to Topic
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ravens1970
New Member

4 Posts
Posted - Nov 30 2015 :  1:39:22 PM  Show Profile  Reply with Quote
I've got 12.6V 3A transformer that I'm now using. I set the pot to half way turn on the charger and connect the battery. The LED is on and when I turn the pot the LED turns off and the voltage rises to around 13.6V and the LED flickers. I'll keep it connected for 20 to 30 minutes and the voltage drops down to 13.5V.

R1 and R3 are 330 ohm and R2 is a 100 ohm pot. D3 is a 1N4734A 5.6V 1 watt zener diode and it's connected the same way as in the schematic.

Thanks for the help.
Edited by - ravens1970 on Nov 30 2015 5:42:11 PM
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Aaron Cake
Administrator

Canada
6717 Posts
Posted - Dec 06 2015 :  10:36:44 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
It sounds as though the charger is operating as it should. The voltage rises to the cut point when the LED begins to flicker. Left alone it will eventually turn solid. The difference of 0.1V is negligible.

If you can't get a voltage higher than 13.6V, then try another 12V transformer.
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ravens1970
New Member

4 Posts
Posted - Dec 06 2015 :  9:56:07 PM  Show Profile  Reply with Quote
I've got another circuit that the SCR is a BT169D and the voltage on this one will go past 15v and the LED never comes on. The other circuit uses a X0402MF 0AA2 for the scr and this one never goes above 13.6V.

Thanks for the help.
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Tharanga
Apprentece

Sri Lanka
6 Posts
Posted - Oct 22 2018 :  11:13:34 AM  Show Profile  Reply with Quote
I have made two 12V chargers of this circuit & they work great.

Now I want make a 24V charger from this circuit & change only following components

1. Two 1k / 1W Resistors for the Voltage divider
2. 24.1V / 1W Zener

Will it work with the rest of components.
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Tharanga
Apprentece

Sri Lanka
6 Posts
Posted - Apr 11 2019 :  10:59:30 AM  Show Profile  Reply with Quote
For a 24 volt version of the charger, the following changes found to be effective.

28 Volt, 4 or 5 Ampere Transformer

R1 & R3 - 1k/1W Resistors

R2 - about 750 Ohm Preset (I used a 250 Ohm preset with a 560
Ohm Resistor in series with center pin)

13.1 volt/1W Zener Diode

I used a 28v/5A Transformer with above changes & a Voltage of 28.5 was obtained.
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Tharanga
Apprentece

Sri Lanka
6 Posts
Posted - Apr 12 2019 :  12:29:51 PM  Show Profile  Reply with Quote
In fact I set the charger at 28.5 volts.

Even a higher voltage around 30 volts is possible with this configuration.
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