My name is Andrei and I'm looking for someone who can guide me to modify my alternator regulator for ages. I'm not an electronic guru but I'm confident I can do it. I've been reading many threads and different opinions about how to do it but nothing helped. Recently I have found Gary's web page that looks promising but no circuit diagram (by the way wish you all the best). On his page I have found this forum so I thought to give it a try. I want to build an adjustable external regulator for my alternator that allows me to set the voltage output, I need to get it up to 15.5V when I need and then take it back to 13.8V, does anyone knows how to do it?
In my opinion you can use Gary's diagram for the car alternator and make a switch for choosing different zener diode or just switch 3 extra diodes in place of the 1N4148 diode in the schematic diagram, just to get a higher output. (see also Gary's text in the description)
Post by volkswagenvan on May 2, 2020 9:22:51 GMT -8
Hi Andrei. Your looking for a variable reference voltage to use on Gary's regulator. It can be done but it would be Best to do what Dante has suggested. A pot can drift in value with temperature and be quite a pain.
What are you trying to do that you need to swing 1.7 volts?
I was thinking about replacing the zener with a pot but I'm not sure how to do it and if the rest of the components will be happy with the mod. So if I use the TL431A with a pot instead the zener and 1N4148 I should get a adjustable regulator, but who is going to set the max output voltage in this case?