trinityamps.com

Trinity Amps Guitar Amp Forum
It is currently Sat Dec 15, 2018 1:51 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: VRM test procedure
PostPosted: Sat Nov 10, 2018 9:04 pm 
Offline
Friend
Friend

Joined: Wed Sep 19, 2018 12:47 pm
Posts: 19
I was getting frustrated today. I had convinced myself that my VRM install had gone wrong somehow.

Mr Cohrs suggested that I try this test procedure. A 9 volt battery. Alligator clip jumper from the battery negative to a ground lug, and get your negative multimeter probe stuck in this same alligator clip. Then put another jumper from battery positive to the B+ in on the VRM.
Put your positive multimeter probe on the VRM's B+ out tab.
Twist the dial on your VRM.

I got about 5.9 volts with the VRM twisted up to max, and down to zero turning the VRM the other way.

One caution: it doesn't start responding normally right away. I think something in the mosfet must need to build up a charge because initially, there's no response at all. Then for a while the voltage change is delayed - you turn up the VRM, and the voltage readout on your multimeter just ssllooowwwllyy starts to increase. After a few times through, it responds immediately.

Thanks Mr Cohrs for this cool test procedure.
I had driven myself crazy imagining there was a problem, then I couldn't figure out my imaginary problem :roll:
This quick test demonstrated that the problem was just in my head, not in the VRM.

Image

Image


Top
 Profile  
 
 Post subject: Re: VRM test procedure
PostPosted: Thu Dec 13, 2018 10:46 pm 
Offline
Friend
Friend

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 26
Location: Shawnee, OK
This was an immense help when I finally installed VRM in my first Trinity build (Tweed). Thanks for posting it!

_________________
"You can always tell a German, but you can't tell 'em much!" ( Momma Ruth)


Top
 Profile  
 
 Post subject: Re: VRM test procedure
PostPosted: Fri Dec 14, 2018 10:03 am 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7181
Location: Brighton, Canada
Weve incorparated it into the manual now! Thanks for being the guinea pig!

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


Top
 Profile  
 
 Post subject: Re: VRM test procedure
PostPosted: Fri Dec 14, 2018 1:51 pm 
Offline
Friend
Friend

Joined: Wed Sep 12, 2018 5:17 pm
Posts: 26
Location: Shawnee, OK
When I was testing my VRM install, I was getting readings that were all over the place on the multimeter. Then I remembered this thread! Got me past the fear of having done something wrong on the install.

_________________
"You can always tell a German, but you can't tell 'em much!" ( Momma Ruth)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group