Hi Vinod,
>
> The red LED should not glow all the time and turning the pot should change
> the output voltage, without the battery connected.
>
> You can do the following things:
>
> Remove the 1K resistor in series with the 10K pot and connect the pot's
> relevant terminal directly to ground.
>
> Connect a 1K pot across the base of the transistor and ground (use center
> and any one of the other terminals of the pot).
>
> Remove everything that's presented at the right side of the battery in the
> diagram, I mean the relay and all.....
>
> Hopefully with the above changes, you should be able to adjust the voltage
> and also adjust the base transistor pot for making the LED glow only after
> the battery is fully charged, at around 14V.
>
> I don't trust and use simulators, I believe in practical tests, which is the
> best method of verifying.
>
> For 12v 7.5 ah battery, use a 0-24V 2amp transformer, adjust the output
> voltage of the above circuit to 14.2 vollts. Adjust the base transistor pot
> such that the LED just starts to glow at 14V. Do these adjustents without
> the battery connected at the output.
>
> The second circuit is also good but is not automatic....is current
> controlled, though.
>
> Let me know your thoughts.
>
> Thanks,
> Swagatam
Hi Vinod,
>
> The red LED should not glow all the time and turning the pot should change
> the output voltage, without the battery connected.
>
> You can do the following things:
>
> Remove the 1K resistor in series with the 10K pot and connect the pot's
> relevant terminal directly to ground.
>
> Connect a 1K pot across the base of the transistor and ground (use center
> and any one of the other terminals of the pot).
>
> Remove everything that's presented at the right side of the battery in the
> diagram, I mean the relay and all.....
>
> Hopefully with the above changes, you should be able to adjust the voltage
> and also adjust the base transistor pot for making the LED glow only after
> the battery is fully charged, at around 14V.
>
> I don't trust and use simulators, I believe in practical tests, which is the
> best method of verifying.
>
> For 12v 7.5 ah battery, use a 0-24V 2amp transformer, adjust the output
> voltage of the above circuit to 14.2 vollts. Adjust the base transistor pot
> such that the LED just starts to glow at 14V. Do these adjustents without
> the battery connected at the output.
>
> The second circuit is also good but is not automatic....is current
> controlled, though.
>
> Let me know your thoughts.
>
> Thanks,
> Swagatam
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