Search found 23 matches

by srgny
Mon Oct 01, 2018 4:52 am
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Used 1K on top of the board across r13and r14 on both pcbs. Seems to work.
by srgny
Sat Sep 29, 2018 9:00 am
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Changing the op amp did not solve the problem.
by srgny
Fri Sep 28, 2018 11:57 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Thanks for the response.
Which of these options is most likely to work? Changing out resistors on this tiny circuit board does not really appeal to me. I will try replacing the IC first.
by srgny
Tue Sep 25, 2018 1:30 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

working
6.8 11.81
7.06 1.31
6.04 3.25
0.01 1.07

not working
1.48 11.81
1.96 1.33
1.97 3.25
0 1.07
by srgny
Sat Sep 22, 2018 8:36 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

No help for this problem?
by srgny
Wed Sep 19, 2018 8:08 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

You've been very generous with your time and expertise. Thank you! New Problem: Everything works fine. VU meter shows deflection, red LED lights with peaks. Great. If I disconnect the VU Buffer power then restart it later-nothing. No deflection, no red LED-nothing. Eventually starts by itself. Any t...
by srgny
Tue Sep 18, 2018 1:38 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

If this make the volume control over sensitive changing 2 resistors in the amp will lower its gain and also improve its noise and distortion.

Which two resistors where? Change them to what??
by srgny
Tue Sep 18, 2018 3:02 am
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

To get any reading on the VU meter from the amp inputs requires that the iPod volume be turned up to about 3/4 to full volume.
by srgny
Mon Sep 17, 2018 9:37 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

No, it measures 3 to 2 in the black region. I have the yellow wire hooked up to power supply ground. Black is hooked up to input - and red is hooked up to input +.
Amplifier runs on 12 volts. Separate supply from VU.
by srgny
Mon Sep 17, 2018 9:20 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

With iPod at maximal volume, VU registers about 3 to 2. !2volt power to VU buffer.
by srgny
Mon Sep 17, 2018 8:53 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

You're right. Turning up the iPod volume causes the VU to work.
by srgny
Mon Sep 17, 2018 8:39 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Hooking the VU directly to the amp input (iPod output, for example) causes no deflection in the meter needle. "VU pot" turned all the way clockwise.
by srgny
Mon Sep 17, 2018 2:57 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

amp-sch.jpg

What about the change in gain with power off?
by srgny
Mon Sep 17, 2018 2:29 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

No, no output before the mains (very simple home made amps).
by srgny
Mon Sep 17, 2018 2:13 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 98
Views: 65365

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

Thanks for your replies. I think this is all a little beyond me. Basically, I use the VUs for their look as they remind me of older, simpler times. I have the VU meters connected to the outputs of my amplifiers. Turning up the volume on the amp causes more deflection in the VU meters. How do I measu...

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