My name is vinod chandran. Proffessionaly i am a dubbing artist in
malayalam film industry but i am an electronic enthusiast too.
I am a regular visitor of your blog. Now i need your help. I just
built an automatic SLA battery charger
but there is some problems with that. I am attaching the circuit with
this mail. The red LED in circuit is supposed to glow when battery
is full but it glows all the time .(my battery shows only 12.6v).
Another problem is with 10k pot. there is no
difference when i turn the pot left and right. . So i request you to
either correct these problems or help me to find an automatic charger
circuit
which gives me a visual or audio alert when battery is full and low .
As a hobbyist i used to make things from old electronic appliances.
For the battery charger i have some components.
1. Transformer from an old vcd player. out put of 22v, 12v,3.3v. And i
don't know how to measure ampere.
My DMM has only the ability to check 200mA. It has a 10A port but
i can't measure any ampere with that.(meter shows "1")
So i assumed that the transformer is above 1A and below 2A with
the size and requirments of the vcd player.
2. Another transformer -12-0-12 5A
3. Another transformer - 12v 1A
4. Transformer from my old ups(Numeric 600exv). Is this tranformer's
input is regulated AC ?
5. couple of LM 317's
6. SLA battery from old ups- 12v 7Ah. (Now it has a 12.8v charge)
7. SLA battery from old 40w inverter - 12v 7Ah. ( the charge is 3.1v)
One thing i forgot to tell you. After the first charger circuit, i
made another one (i'll attach this too). This is not an automatic one
but it is working.
And i need to measure the ampere of this charger. For that purpose i
googled for an animated circuit simulation software but didn't get one
yet.
Atlast i found one in this link
(http://www.cs.technion.ac.il/~wagner/index_files/ckt_anim/). But i
can't draw my circuit in that tool. there is no parts like LM317
and LM431(variable shunt regulator). not even a potetiometer or led.
So i request you to help me to find a visual circuit simulation tool.
I hope you will help me.
regards