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PostPosted: Fri Apr 21, 2017 8:30 am 
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Hi,

I just built a BYOC Silver Pony that I purchased from Alchemy Audio. The pedal works and sounds like it should, with one exception: whenever I play I hear a distorted, fizzy sounds "underneath" the notes I'm playing. I have no idea where this is coming from. I double checked each resistor twice with my multimeter before installing them, all of my polarized caps are in the correct orientation, I'm sure the gain pot isn't shorting against the board; I don't know what's causing this. I even cleaned all of the pots with deoxit D5 and re-soldered any pads that looked questionable, but I'm still getting this annoying fizz. Could anyone who knows more about electronics and pedals help me out?

I've built three pedals from kits before, modified my tube amp, and have modded a couple DS-1 pedals in the past, so I'm not totally new at this, but I'm stumped! Thanks in advance!


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PostPosted: Fri Apr 21, 2017 9:12 am 
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Hey, sounds like you've taken the most obvious troubleshooting steps already, which is good.

To help you out, the smart folks here will need to see photos of your build. Please make them large and well-lit enough to make out the component values, and include both sides of the circuit board and all switch and jack wiring.

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PostPosted: Fri Apr 21, 2017 10:46 am 
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Hi Scott,

Thanks! Here are some pics:

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Any ideas? Thanks for your help!

--Alex


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PostPosted: Fri Apr 21, 2017 10:54 am 
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Turn your iron up a bit higher and reflow your joints. Also, try to clip the leads as close to the PCB as possible. There are some worrying joints there. Do this and let us know what happens.

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PostPosted: Fri Apr 21, 2017 11:03 am 
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Nwkenning wrote:
Turn your iron up a bit higher and reflow your joints. Also, try to clip the leads as close to the PCB as possible. There are some worrying joints there. Do this and let us know what happens.

Here's some additional guidance on that process: http://www.byocelectronics.com/board/vi ... =9&t=52188

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PostPosted: Fri Apr 21, 2017 1:44 pm 
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Thanks for the suggestions! I read your instructions and reflowed every single solder joint and double checked everything to ensure there are no shorts. I reseated the ICs in the slots to ensure there was a good connection, too. The buffer sounds great but still, when I play with the effect on, I'm getting the same fizzy artifact "underneath" when I play notes through the pedal. Do you guys have any other ideas? I appreciate all of your help!

Alex


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PostPosted: Mon Jun 26, 2017 9:08 pm 
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Location: Chicago, IL
Reviving this thread because I experienced the same issue while assembling a Ceriatone Centura - which is their Klon clone and a nearly identical circuit to the Silver Pony. I was pulling my hair out trying to diagnose the cause of the issue. Turns out I had two wires swapped on the footswitch. Everything worked but the error caused the "fizzy" decay - almost a subtle, gated fuzz-like sound on the note decay.
Check your footswitch wiring / soldering. It might be worthwhile to install a new 3PDT and see if the issue persists. Good luck.

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Alchemy Audio
http://www.alchemy-audio.com


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PostPosted: Tue Mar 13, 2018 5:43 pm 
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Another thread revival - I'm having a similar issue.

As well as all the early trouble-shooting steps, I replaced the 3PDT and resoldered the switch - still a real fizz to the decay.

It seems to worsen with an increased in gain - maybe gain pot?

Anyone have any suggestions?


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PostPosted: Tue Mar 13, 2018 7:43 pm 
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DavidC77 wrote:
It seems to worsen with an increased in gain - maybe gain pot?

Very doubtful that it would be the pot itself, but that does suggest that the problem is in the section of the circuit that generates the distorted part of the signal. First thing I would do would be to swap the positions of the two TL072 dual op amps and see if that affects the character of the decay. Another possibility would be to try a more robust charge pump IC, specifically an LT1054. Mouser sells them for under $3. See HERE.

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PostPosted: Tue Mar 13, 2018 8:08 pm 
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Will give that a go. Many Thanks


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PostPosted: Fri Mar 16, 2018 10:03 pm 
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Ok - I swapped around the TL072 dual op amps, and it seems to have significantly reduced (but not fixed) the fizzing decay problem.

I'm confused though - why?

Is it just that I probably didn't have one seated properly, or is there more to it?


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PostPosted: Sat Mar 17, 2018 10:41 am 
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I suspect that one of the two is defective, and that its defect is more noticeably manifested in one position in the circuit (most likely the the IC1A gain stage, I would think) than the other. Since TL072 op amps are quite inexpensive (BYOC sells them for a buck, though they show as out of stock at the moment), I would just pick up a replacement and try it in each of the IC positions. Hopefully the fizz disappears with one of the two substitutions.

Incidentally, you don't have to use a TL072, since any general purpose dual op amp should work in that service. So if you have another pedal on hand with a socketed dual op amp (JRC4558D, RP4558P, NE5532, TL082, OPA2134A, etc.) in it, you can pull it out and try the same substitution experiment I've suggested. And if my theory that one of the two TL072's is bad is confirmed, I'm sure that BYOC would provide a replacement to you free of charge. Just contact sales@buildyourownclone.com.

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


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