Moog Music Forum

Hi all,

I pulled my Voyager out today for the first time in a year or so to have a jam on.

Everything seemed to be fine but after playing for a while I noticed that I was getting weird volume drops on notes while playing. Notes would become very quiet and then back to normal volume completely randomly.

I think I traced the issue to the Volume ADSR Decar control. Turning the control to zero I didn’t have any of the volume drop issues, as soon as I turned up the control they started again.

I haven’t previously had a problem with the envelopes on my Voyager. I have had the main board replaced as mine was one of the models that had IC issues originally.

Not really sure what’s causing it and kinda bummed as I was looking forward to playing in it again. Any advice appreciated!!

Hi,
if U13 (LM339) on the analog board is still a Texas Instrument chip replace it.

Thanks! I’ll open it up and and take a look!

RL wrote: Fri Feb 25, 2022 6:18 am Hi,
if U13 (LM339) on the analog board is still a Texas Instrument chip replace it.

Had a look and it’s a definitely a Texas Instruments LM339N! Even though I’ve had the analog board replaced under warranty, this chip could be the issue?

Thanks!

last week I had the same issue on a Voyager on my desk and it was that chip.

RL wrote: Sat Feb 26, 2022 4:59 am last week I had the same issue on a Voyager on my desk and it was that chip.

Cool! What did you replace it with? Seems like the TI version is out of stock just about everywhere!

Thanks again!