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Surely for an external regulator type alternator as used here, it would be a matter of just regulating the output to 6V instead of 12V without any modifications to the alternator? It would simply be a lower excitation voltage on the armature.
I am all for a programmable regulator too, as already mentioned, but based on my extensive experience, I will say that you will have a fairly long road ahead with this project.
I am not sure about that for all cases since that extra charging power is being removed from the power to drive the car.
An old VW does not have a lot of power, so it is vital to be frugal with charging the battery.
There is no question that I would use a CPU if I were to build a regulator like this.
The main problem here is to get the charge cycle started so the regulator can have power.
The second issue I see with a CPU is to protect and filter everything so that the 'dirty' feedback will actually make...
If you get it right, it will be a lot better than a Zener.
Zeners are pretty bad, when there is not enough current through them (~60% of the rated current)
I am not too sure how robust the TL491s are for such a rugged envorinment.
The only question is where you need that sort of accuracy here.
Have you seen pictures of a L3500?
It is 12V. Not converted.
The generator is a Bosch 160W unit 10A.
The regulator is also an original one but I think it is broken. The cover is missing and everything is covered in grime and corrosion.
I have just finished fabricating vital coolant system piping...
Still thinking about this... If you pursue this powering of the armature, then I think the better way will be to have a transistor that saturates. The transistor will then only have ~0.2V on Vce and the power dissipation will be minimal.
That is will not be possible with the NPN emitter...
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