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PostPosted: Tue Jan 24, 2017 11:24 am 
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Hey gang

so this is only my 3rd pedal build.

initially, all packed up it seemed to short out sometimes, so i took it out of its enclosure, and now its sounding better, but the sustain is about 8 times longer on my relatively new, run of the mill E-H big muff pi.

here are some soundclips
in enclosure
https://drive.google.com/open?id=0B44zg ... 0NBbzZSUlU

unpacked
https://drive.google.com/open?id=0B44zg ... llwTWh3R2c

unpacked all at 10
https://drive.google.com/open?id=0B44zg ... G5HRzVhb0k

whatchyall think? Am i right that something isnt working correctly?
Figured I'd check before making my first attempt at checking all the voltages!

Attachment:
2CEEB512-B01F-42A9-8BA4-9034CACEA961.jpg
2CEEB512-B01F-42A9-8BA4-9034CACEA961.jpg [ 537.24 KiB | Viewed 532 times ]


Last edited by joe overton on Fri Jan 27, 2017 12:06 pm, edited 1 time in total.

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PostPosted: Tue Jan 24, 2017 12:59 pm 
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Definitely something seriously wrong there--that doesn't sound remotely like a BMP circuit should. Double-check all of your resistors, particularly the ones that share the first two digits--its very easy, for example, to switch a 4.7K resistor with a 470K. I can't see any resistor errors, but there are many resistors whose banding I can't make out, and a few that are completely hidden from view.

If that doesn't turn up anything, my next suggestion is this: viewtopic.php?f=9&t=52188

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PostPosted: Thu Jan 26, 2017 1:06 pm 
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okay, well I've double checked all the resistors, they're looking good, and i re-flowed all the connections. the connections on the sustain pot we're looking a little thin, so i added some more solder.

the sustain has improved a good bit, but its still not nearly as long as my modern EH big muff pi. When i put the two next to each other knobs at noon, I'm getting very little volume and fuzz out of my lil beaver comparatively. I could post some more clips if that'd be helpful, but but in comparing the two it really seems like something is still wrong.

Is checking and posting all the voltages the next step? Is there a good beginners guide for this somewhere?

here's another round of photos in case that's helpful.
https://drive.google.com/open?id=0B44zg ... kVlNGFQd3M
https://drive.google.com/open?id=0B44zg ... XQtRlNoTTQ
https://drive.google.com/open?id=0B44zg ... FZPbWZKZTQ
https://drive.google.com/open?id=0B44zg ... HNEUnRhUUk


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PostPosted: Thu Jan 26, 2017 1:25 pm 
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Can you check these values please?


Attachments:
ramsbeaverQ.jpg
ramsbeaverQ.jpg [ 518.14 KiB | Viewed 501 times ]

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PostPosted: Thu Jan 26, 2017 2:30 pm 
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hey there Nwkenning!

thanks for your help! are we talking resistance values?

If that's correct then they are as follows--
top to bottom left to right

the 272 resistor slot is reading 2.698k
the 474 is reading 133k*
the 474 is reading 139.7k*
the 433 is reading 40k
the 474 is reading 110.2k*

the * indicates that the value keeps getting higher in increments of .1k the longer I have the probes connected, i just waited a few seconds and recorded that value.

I'm taking these readings on the face of the board you have reposted the picture of if that makes any difference.


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PostPosted: Thu Jan 26, 2017 3:10 pm 
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Depending upon what a given resistor is connected to in the circuit, it is very often the case that you cannot get an accurate reading of its resistance once it's installed. This happens because of the frequent presence of parallel circuit paths. When this happens, the reading that you get will always be lower than the actual resistance--often substantially lower.

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PostPosted: Thu Jan 26, 2017 3:38 pm 
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duhvoodooman

i was assuming that was why those 474s weren't reading anywhere near their normal value. should i pull then off the board and check them that way? based on the color banding, which i know you cant see in that photo, they are definitely the right ones.

here are photos where you can see the resistors
Attachment:
474resistors 1.jpeg
474resistors 1.jpeg [ 295.26 KiB | Viewed 492 times ]

Attachment:
474resistors 12.jpeg
474resistors 12.jpeg [ 113.92 KiB | Viewed 492 times ]


Last edited by joe overton on Thu Jan 26, 2017 4:08 pm, edited 1 time in total.

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PostPosted: Thu Jan 26, 2017 3:47 pm 
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Nah, just wanted to be sure that they were close to the right values because the color bands looked a bit off, I figured it was simply an issue with the color of the pictures, but wanted to be sure.

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PostPosted: Thu Jan 26, 2017 7:16 pm 
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At this point, you'd probably be best off buying or making yourself a signal tester and use it to trace the signal path until you find where the signal is heading south.

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PostPosted: Fri Jan 27, 2017 11:42 am 
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so, i made a signal tester and started trying to figure it out, and somewhere in the process the sustain issue just magically went away (not a particularly satisfying place to leave it).
So i made this video comparing the build at its current state with my run-of-the-mill EH big muff pi.
https://www.youtube.com/watch?v=V7eVmFxkvS0
https://youtu.be/pQWrLeSKOM4 - this is a second video with more playing on each individual pedal
If you hear around 20 seconds how the signal pops and sputters as its dying out, it had been doing after about 8 seconds before the magic.

so now i'm just wondering if the tone if close to where its supposed to be.
its being played with a jazzmaster, through my pedal steel amp, a solid state peavey nashville 400.


Last edited by joe overton on Fri Jan 27, 2017 2:06 pm, edited 1 time in total.

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PostPosted: Fri Jan 27, 2017 12:09 pm 
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joe overton wrote:
...so now i'm just wondering if the tone if close to where its supposed to be.

Can't tell from that. Would be much more useful if you would play a little bit through both pedals, so that we can hear the note attack & sustain, as well as its tonal character.

Not a good thing that the problem "just magically went away." Such solutions tend to disappear as magically as they came. Sounds to me like a funky connection somewhere.

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My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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PostPosted: Fri Jan 27, 2017 2:10 pm 
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https://youtu.be/pQWrLeSKOM4 here's a second video that's hopefully better!

I'm gonna try adding heat shrink tubing to a bunch of the connections to maybe prevent a relapse!


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PostPosted: Sat Mar 18, 2017 9:32 am 
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I'm having the exact same issue on the same pedal! Very sputtery, and the sustain cuts out very quickly. This is my first build, so I suppose what I need to do is build that signal tester and pull it all out.


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PostPosted: Mon Mar 20, 2017 1:47 pm 
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If the problem cuts in and out, that's an indication that there's probably a cold solder joint somewhere, or maybe something got bent too much when you stuffed the guts in the enclosure. Do you still have this problem with the guts outside of the enclosure?

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