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Pedal whine
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vvv
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Joined: 13 May 2003
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PostPosted: Sun Oct 30, 2016 6:45 pm    Post subject: Pedal whine Reply with quote

I have a nice overdrive/boost by Toadworks called, "Meat, Jr."

Recently, it started a low-level whine sound when activated, like a sine wave, no oscillation, just constant.

Would that be a bad cap?

What is the easiest way to diagnose the problem?
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Nick Sevilla
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PostPosted: Mon Oct 31, 2016 1:08 am    Post subject: Re: Pedal whine Reply with quote

Sounds like a component in the feedback portion of the circuit is no longer going to ground, and causing too much feedback.

Without seeing the schematic, impossible to say which one could be the culprit.
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vvv
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PostPosted: Mon Oct 31, 2016 7:11 am    Post subject: Re: Pedal whine Reply with quote

OK, that gives me a beginning, thanx.
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PostPosted: Mon Oct 31, 2016 8:14 pm    Post subject: Re: Pedal whine Reply with quote

How old is it? It usually takes years for caps to go bad.
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vvv
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PostPosted: Tue Nov 01, 2016 12:20 am    Post subject: Re: Pedal whine Reply with quote

I'm guessin' 5-7 years old? Seems to have come out first in 2009 ...

See here.

I really like this pedal when it's working correct.

I have the older Meat pedal also, but prefer the Jr.
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floid
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PostPosted: Tue Nov 01, 2016 6:56 am    Post subject: Re: Pedal whine Reply with quote

My ProCo Rat stopped doing this when I replaced the well- abused footswitch.
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vvv
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PostPosted: Tue Nov 01, 2016 7:16 am    Post subject: Re: Pedal whine Reply with quote

Hmmm ...

We have a mix session 2-nite; I hope to work on this pedal, and fix some mic and patch cords, this weekend.

As well as clean the battery-acid goop outta a pedal I just got offa the E-bog (full refund).
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PostPosted: Tue Nov 01, 2016 9:25 am    Post subject: Re: Pedal whine Reply with quote

Does it still make the noise with a shorted jack in the input? Tried on multiple amps/interfaces?

Just trying to rule out bad cables, noisy pickups, jacks, etc.
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vvv
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PostPosted: Tue Nov 01, 2016 9:31 am    Post subject: Re: Pedal whine Reply with quote

Haven't tried the shorted jack.

It's more apparent when the pre-amp is gained up, and yep, onna cuppla different amplifiers, with a cuppla different cables, guitars, etc.

It didn't used to do it with a One-Spot, but I'll try and switch that out, I reckon, also.

Basic troubleshootin' first, yep. Cool

The pedal's controls have no effect, and I'm pretty sure it's in the pedal guts.

I will report back.
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PostPosted: Tue Nov 01, 2016 9:46 am    Post subject: Re: Pedal whine Reply with quote

If a battery quiets it up, could be that the cap they put on the power jack is drying out, and isn't smoothing like it used to.

Assuming they put one on, most do. But yeah, if it does the same on battery with a shorted jack, you've ruled out input noise and power line noise.

Do you have a scope to look at it?
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vvv
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PostPosted: Tue Nov 01, 2016 5:05 pm    Post subject: Re: Pedal whine Reply with quote

No, no scope.

And I hate Listerine ... Twisted Evil
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PostPosted: Tue Nov 01, 2016 5:11 pm    Post subject: Re: Pedal whine Reply with quote

If you mix with olive juice, can you tell the difference between listerine and vodka? Shocked

Well all the old dodges apply, you can try rigging an audio probe, and tracking the signal, try ithe unit on a battery, short the input jack, etc, etc.

Also never undervalue the worth of taking everything apart, like removing the board, jacks and pot from the case, running some pot and switch cleaer over the salient parts and bolting it all back together again Very Happy
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PostPosted: Wed Nov 02, 2016 1:24 am    Post subject: Re: Pedal whine Reply with quote

T'anx!
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vvv
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PostPosted: Wed Nov 02, 2016 6:49 pm    Post subject: Re: Pedal whine Reply with quote

Aiight, did all as above.

Shorted cable, different cables = no effect.

Pot and switches are clean, "Fat switch" changes the tone of the whine; no whine if pedal is in bypass.

No problem with the battery - no noise at all.

A couple different power supplies; 1-Spot (9v 1700mA output) gives the whine, a Mr. Power (9v 2A output) oscillates the whine.





Idears?
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vvv
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PostPosted: Wed Nov 02, 2016 7:12 pm    Post subject: Re: Pedal whine Reply with quote

So, I just swapped in the older-model Meat pedal and, guess what?

Same f*ckin' problem when using the (admittedly inexpensive) power supplies, chained or just this pedal being powered.

It must be a Microsoft-like "design feature", as a battery works fine. (Interestingly, the original Meat pedal [serial # 005] is all real resistors and such on the board - none of that machine-soldered micro-shite like pictured above.)

Too bad - I really like the sound of the pedals, but I refuse to go on stage or even jam, in 2016, using batteries.

So I ordered a Blackstar Boost so mebbe I'll swap that in, or put the Soul Food back on my board, just use these in the bedio.
Evil or Very Mad
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