Search found 9 matches

by bigboy
Fri Sep 24, 2021 7:33 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Ok

Rewired as above

Adjusted meters and they do work...... but

After turning the amp off and on again they only way I can get them going again is to quickly wake them up by turning the volume up to almost 100% for a brief moment ? Progress I guess.

Richard
by bigboy
Fri Sep 24, 2021 5:44 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Sorry, I have the 12V wired to the VU globe and not the meters, sketch was wrong.

So based on your sketch I just need to swap the black and green around ? I thought I had already tried that but I will give it a go and report back.

Final wiring as attached.
vu.png
by bigboy
Thu Sep 23, 2021 12:32 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

The saga continues :) Fired up the amplifier this morning and there is no response from either VU meter. I must be wiring something incorrectly. I have attached my wiring diagram. Its as though the meters need to be "charged" or "awakened" some how. Any suggestions on the wiring appreciated. Amp.png
by bigboy
Wed Sep 22, 2021 10:37 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Hi Joe Omg, I have spent 3 days trying to sort this out. One buffer board has fried an opamp, 2 1uf caps and a diode. I decided to desolder the lot and rebuild it and it seemed to fix the issue.... it seemed. Then the same meter stopped working all of a sudden. It turned out to be the solder connect...
by bigboy
Sun Sep 19, 2021 12:44 am
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

I think the issue is I am sharing the power supply from the amplifier to power the buffer but don’t fully understand the wiring needed. I use a dc-dc buck converter to reduce the +35v amplifier rail to 12v which powers the buffer. I connect the amplifier input audio rca V+ to the V+ Of the buffer bo...
by bigboy
Sat Sep 18, 2021 6:45 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Hi Joe

I have wired the meters at the amplifier inputs but I am having difficulty registering movement on the meters when playing real music ? No problem calibrating the meters with my signal generator and a sine wave though?

Cheers
by bigboy
Mon Sep 06, 2021 10:24 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Thanks Joe

One last question, what does the yellow wire input connect to ? The red/black is obviously the signal input. Seems to work fine without connecting the yellow to anything ?

Richard
by bigboy
Sat Aug 28, 2021 7:18 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Thanks Joe

Can I ask what people use the peak circuit for ? A simple LED on the from panel of the amp seems a bit simple/static. What else can be done or have yu seen done with the peak circuit ? Not that I want more holes to make on the front timber facia of the amp :)
by bigboy
Sat Aug 28, 2021 2:05 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 144
Views: 346182

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

OK, got both boards soldered up and connected to ST-475's. Just wanted to confirm the setup procedure. I am wiring these into a 30W Jean Hiraga Build, using a buck converter to get 12V from the 35V amplifier rail. I have tested the amplifier and an input signal level of +-1.8v sine wave will generat...