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PostPosted: Mon Apr 18, 2022 9:43 am 
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Hi all,

I just finished my 4th BYOC build, the Divided Octave (I'm building it for a T Rex "Life's a Gas" soundalike project), and it's not quite functioning right. All lights are on, and the pedal does create an octave, but only with both foot-switches activated. When the Octave down switch isn't engaged but the pedal is on it doesn't do anything. Mix and Tone knobs don't seem to be meaningfully effecting the signal. I've pulled it back apart and checked my solder points, and I'm at a loss. When I had trouble in the past with an overdrive pedal build I was able to have someone on this forum talk me through some control values and where to meter for them, and then diagnose the problem. I am not really sure how to get started with though, so any help would be greatly appreciated! I attached pictures in case someone sees something obvious I missed.

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Thanks so much!


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PostPosted: Mon Apr 18, 2022 10:20 am 
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Can you confirm that the 6-7 jumper on the main footswitch isn't touching the #8 lug of the switch?

Do you have access to a multimeter and know how to measure DC voltage with it?

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PostPosted: Mon Apr 18, 2022 10:35 am 
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The jumper didn't seem to be touching lug 8 but i bent it a little farther away just in case. And yes I have a meter and can do that.


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PostPosted: Mon Apr 18, 2022 10:57 am 
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thekatzinthehat wrote:
...And yes I have a meter and can do that.

Please take a set of pin voltages on the 1044 charge pump and report them here. Pin numbering is per the image below:

Image

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PostPosted: Mon Apr 18, 2022 12:05 pm 
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Ok here's what I got at the charge pump

Image[/url]


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PostPosted: Mon Apr 18, 2022 1:01 pm 
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Your symptoms would suggest that you don't have a good solder connection at several of the terminals on the MIX and TONE potentiometers. Try reheating the solder on those.

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PostPosted: Mon Apr 18, 2022 2:48 pm 
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Charge pump voltages look very reasonable. Go with Keith/byoc's recommendations.

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PostPosted: Mon Apr 18, 2022 4:59 pm 
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So i touched up those points and the tone pot does seem to be working, but i'm still having the issue where it won't even pass signal when the On switch is engaged but the Bass only switch isn't. And there's a pretty significant volume drop from bypass when both switches are engaged. Any other ideas?

Thanks


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PostPosted: Tue Apr 19, 2022 1:26 pm 
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thekatzinthehat wrote:
So i touched up those points and the tone pot does seem to be working, but i'm still having the issue where it won't even pass signal when the On switch is engaged but the Bass only switch isn't. And there's a pretty significant volume drop from bypass when both switches are engaged. Any other ideas?

Thanks


So your "wet" octave down is working, but the final IC1a buffer stage doesn't appear to be working. You've likely got another cold solder joint at IC1 and/or its components (R32 - 35 and C21 - 23).

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PostPosted: Tue Apr 19, 2022 1:28 pm 
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viewtopic.php?f=33&t=39392

Here's the PCB map for the divided octave

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PostPosted: Fri Apr 22, 2022 7:44 am 
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Okay so I went through and touched up all of those solder points, and I'm still having the same issue. Is there any chance you have a list of voltage values I could go around to the IC's and check for? Or how I would get those? I'm just not experienced enough to know how to isolate the problem.

Thanks


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PostPosted: Fri Apr 22, 2022 10:39 am 
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thekatzinthehat wrote:
Okay so I went through and touched up all of those solder points, and I'm still having the same issue. Is there any chance you have a list of voltage values I could go around to the IC's and check for? Or how I would get those? I'm just not experienced enough to know how to isolate the problem.

Thanks


We'll get there. It just takes a few tests sometimes. Base on your symptoms, I have a pretty good idea of where the problem is. We just need to pin it down to a specific spot in the circuit. Please take voltage readings of IC1.

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PostPosted: Fri Apr 22, 2022 12:18 pm 
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byoc wrote:
Please take voltage readings of IC1.

To measure the DC voltage level on the IC pins, set your multimeter to the DC voltage mode, indicated by a solid line above a dotted one. Use the 20VDC range setting if it's not an auto-ranging meter. Your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to each pin that you want to measure. See left side of the image below for the numbering of the pins.

Image

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