Guyatone - WR-3 Wah Rocker 3  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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shredgd
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Post by shredgd »

Hi,

sure!

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Enjoy!

Giulio

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shredgd
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shredgd
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Post by shredgd »

ERRATA CORRIGE:
In the schematic the emitter of the transistor goes to ground (the layout is correct though).
The ICs are 4558, not 4458.

Giulio

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x-tn
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Post by x-tn »

shredgd wrote:ERRATA CORRIGE:
In the schematic the emitter of the transistor goes to ground (the layout is correct though).
The ICs are 4558, not 4458.

Giulio
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Guyatone WR3 sch.gif

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ch1
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Post by ch1 »

Hi!

Are there anyone here who knows how to inklude the controls for range/response, variable blend and gain/fx-level from Guyatone Wrm5 and the TWA WR3 clone to the original WR3 cirquit?

I guess it's quite simple and straight forward for anyone with the right knowledge.

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Bside2234
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Post by Bside2234 »

selfbg wrote:Can someone recommend value for Q3? :roll:
Just in case anyone still wants to know the original transistors:
Q1 2SK30A
Q2 2SK30A
Q3 2SC1815
Q4 2SK30A
Q5 2SK30AY

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Tomrcarre
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Post by Tomrcarre »

Did anyone ever get the vero layout on the first page working? I think some pot connections are missing

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Bside2234
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Post by Bside2234 »

Tomrcarre wrote:Did anyone ever get the vero layout on the first page working? I think some pot connections are missing
Just look at the included schematic for the pot wiring. VR2/1 goes to ground while VR2/2 connects to C11. Looking at the vero, I don't think it's right. It has C11/222 to ground instead of the pot.
Maybe I'm wrong. It's early and haven't finished my first cup of coffee. ;)

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Tomrcarre
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Post by Tomrcarre »

I've got a load of op amps on the way at the moment so hopefully in a few days i'll be able to bang it on the breadboard and see if I can get it working. I was looking at the pot wiring compared to the first schematic and thought it looked a little odd, the one further up this page looks a lot easier to understand so fingers crossed :D

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Bside2234
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Post by Bside2234 »

Tomrcarre wrote:I've got a load of op amps on the way at the moment so hopefully in a few days i'll be able to bang it on the breadboard and see if I can get it working. I was looking at the pot wiring compared to the first schematic and thought it looked a little odd, the one further up this page looks a lot easier to understand so fingers crossed :D
A quick look at that one and it looks odd around the Decay pot. Check that 47K/12K/10U/330E junction with the original schematic. I don't think it's the same. Everything up to that 5088 doesn't look right.
Also remember to add power to the IC as this schem doesn't show it.

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