AMS DMX / RMX PSU Upgrade Theory

Help Support GroupDIY:

ecaltd

Member
Joined
Apr 21, 2014
Messages
16
Currently working on a DMX-15T project currently down to the motherboard and psu issues.

Question is... has anyone accomplished or entertained the idea of clearing out the stock internals and feeding the busses with new supplies ? The +5 has gone bad, the others were showing slightly off voltages and now it just blows the mains fuse, but not the rail fuses.

It seems to me that there would be plenty of room by removing the near to impossible to get toroidal and filter caps and installing COTS 5v switcher and "DIY" linears for the audio rails. Then removing the regulator IC's and associated circuitry and injecting voltages at the test points ???

Am I way off base here or is clean DC clean DC ?

Thoughts ?

Cheers,
gb
 

ecaltd

Member
Joined
Apr 21, 2014
Messages
16
I put a switchmode supply in one years ago, worked fine. The early ram used a 12 volt negative supply which is not necessary for later ram cards.
Excellent, did you eliminate all the redundant circuitry ? Can you just remove the test point links and feed there ?

Thanks,
gb
 

Whoops

Well-known member
Joined
May 9, 2008
Messages
6,350
Location
Portugal
Question is... has anyone accomplished or entertained the idea of clearing out the stock internals and feeding the busses with new supplies ?

I haven't done it with that unit but done it with others.
I did that on a SPX90, completely removed the original PSU that was beyond repair and installed a new one
 

ecaltd

Member
Joined
Apr 21, 2014
Messages
16
Cleaned up, found those pesky tantalums,put led indicators on the rails...out of all the bizarre and random components in the shop I didn't have a single 7812 or 7905 :rolleyes:fullsizeoutput_753.jpeg
 

Latest posts

Top