Author Topic: Pork Barrel - Chorus disappears when rate LED is connected  (Read 1507 times)

benny_profane

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Re: Pork Barrel - Chorus disappears when rate LED is connected
« Reply #15 on: February 26, 2019, 07:41:11 PM »
That's quite a surprise. I've used the 1k/LED setup on tons of different LFOs and it's never posed a problem. The only one I can think of off-hand was with a Univibe where the LED did result in a different depth response, but that's a completely different type of LFO.

Can't say why it's happening for you but I had a hunch. Don't know if the LED is acting as a current sink or somehow screwing with the depth overall.

Iím running at 12v off the 3PRR board. Could the extra voltage (re zgravís comment) be the issue?

Yup, that's it. In fact I ran into a very similar issues when I was working on modulation for my AD-900 project. When I powered the LFO board @ 12v the entire depth shallowed out. I changed the voltage divider supply to the LFO from two 220k to 470k and that fixed the issue. Anyway, the PB LFO runs fine @ 12v, but something about the combination of the LED flattens it. So, I guess the solutions is more resistance in front of the LED.

Yeah, Iím surprised/happy/a little frustrated it was something so simple. I had been running it unboxed for awhile since itís a great effect and I had some issues with the enclosure finally getting sorted out. I dissembled and rechecked everything when it cut out after boxing itóit was quite a surprise. Luckily no terrible damage has been done.

zgrav

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Re: Pork Barrel - Chorus disappears when rate LED is connected
« Reply #16 on: February 27, 2019, 09:43:05 AM »
Always a relief to isolate the issue and get it working!

benny_profane

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Re: Pork Barrel - Chorus disappears when rate LED is connected
« Reply #17 on: February 27, 2019, 10:19:50 AM »
Always a relief to isolate the issue and get it working!

Yeah! Thanks for your help!