Hi, Robert

Your question is somewhat fuzzy ...

Yes, You can change "digital" ( lol ) servo electronics for an analogic "old" one.

Yes you can find some DIY digital electronics on the Web ... but it doesn't seem to be what you intend to do ...


But you won't get any advantage in such rebuilt ... a "HongKong" servo always will stay " no so good " ...
And it' somewhat funny to adjust the amplifier parameters to the mechanics !!!

Have fun

Alain