Search found 5 matches

by Spendor
Tue Sep 08, 2009 8:45 am
Forum: JLM Audio Kits
Topic: AC/DC & POWERSTATION KIT BUILD THREAD
Replies: 350
Views: 811245

Re: AC/DC & POWERSTATION KIT BUILD THREAD

Ahh yes I meant -40V. Trimmer orientation is correct and reading 2.5k so I replaced the LM337 and it is now all working 100%. Now to try out this mic preamp...... Thanks once again for your invaluable help.
by Spendor
Mon Sep 07, 2009 5:35 pm
Forum: JLM Audio Kits
Topic: AC/DC & POWERSTATION KIT BUILD THREAD
Replies: 350
Views: 811245

Re: AC/DC & POWERSTATION KIT BUILD THREAD

Thank you very much for your reply. I had some 10k trimmers so I used them. Before I put them in I wound them all down to 2.5 k thinking that would be fine - well it probably would have been if I had measured them correctly! In circuit they were all reading 7.5 k so I messed up there. I have wound t...
by Spendor
Fri Sep 04, 2009 6:09 pm
Forum: JLM Audio Kits
Topic: AC/DC & POWERSTATION KIT BUILD THREAD
Replies: 350
Views: 811245

Re: AC/DC & POWERSTATION KIT BUILD THREAD

I'm using the doubler - I think this is correct?
Cheers
by Spendor
Fri Sep 04, 2009 10:37 am
Forum: JLM Audio Kits
Topic: AC/DC & POWERSTATION KIT BUILD THREAD
Replies: 350
Views: 811245

Re: AC/DC & POWERSTATION KIT BUILD THREAD

unfortunately I'm across the ditch in NZ. I've checked and double checked the orientation of caps and diodes, so it must be a short somewhere. Is there a way I can narrow it down to find the offending area?
Cheers
by Spendor
Thu Sep 03, 2009 12:20 pm
Forum: JLM Audio Kits
Topic: AC/DC & POWERSTATION KIT BUILD THREAD
Replies: 350
Views: 811245

Re: AC/DC & POWERSTATION KIT BUILD THREAD

Hello there. I've put together and AC/DC power supply. I'm using an RS transformer 30VA 25-0-25 . I'm getting 31V ac into the supply which seems a bit high, but perhaps OK under load? my problem is I'm getting +/- 40v and 80v for phantom. Trim pots are not operational. I've looked over the PCB 20 ti...