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T O P I C    R E V I E W
thunder Posted - Apr 01 2011 : 07:27:50 AM
i have a battery charger of 12V SLA which have AC plugpack 12V and i want to replace it with a transformer, but i dont know which transformer is suitable, can someone help me please immediately?

ANOTHER QUESTION

I want to improve 12V SLA battery charger by adding Alarm which will ring when LED indicator lights when the battery is fully charged at the same time, so where can i connect it?

Download Attachment: BatteryCharger12vSLA.gif
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Aaron Cake Posted - Apr 02 2011 : 10:25:41 AM
Instead of titling your posts with words like "emergency", try something a bit more descriptive like "Looking for a 12V transformer for SLA battery charger". Your question is most certainly not an emergency.

To replace the 12V AC wall transformer, you can use any 12VAC transformer with appropriate current ratings. That means at least 500mA as specified in the circuit. So any standard 12V 1A transformer will do the job. These are very common.

If you would like a buzzer to sound, connect the base of any standard NPN signal transistor (2N3904) through a low value resistor (1-5K) to the junction of the zener and 1K pot. Connect you buzzer between the collector and +, and then ground the emitter.

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