[modeleng] voltage controll

Evnin' All

I my Workshop, I have a 3 phase (6,5KVA) diesel genset.
This provides the current for my (big ) lathe and a number of other 3 
phase motors.
For the 3rd time the AVR (automatic voltage controller) has clapped out.
At 100 euro's a pop, yours truly is fed up.
I am an electronics engineer, so I can design/ make a more robust one 
myself, but it would help to have a circuit diagram of one.
The commercial ones are embedded in a sort of gunk ,to protect them from 
moisture and prying eyes like mine...
So it is impossible to get that stuff of, without totaly mangeling to 
circuitboard.
I did that anway, only to find out, that most of the components have no 
serial/type numbers
Even the resistors are not colorcoded!
Any body any ideas?

Patrick
Flanders
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