SolidGoldFX Super Drive

Yun_Suki · Post by **Yun_Suki** » 24 Apr 2022, 01:15

Wish you all the best...in this damn Covid-19 pandemic

This is SolidGoldFX's Super Drive pedal

dismantling...

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The Schematic

PCB

Gerber_PCB_Super Drive SGFX2.zip: (46.96 KiB) Downloaded 151 times

Circuit board proofing file...

FuzzMonkey · Post by **FuzzMonkey** » 24 Apr 2022, 09:57

Cool. Thanks.

Ichabod_Crane · Post by **Ichabod_Crane** » 24 Apr 2022, 15:06

Thanks.

How the Volume pot could work wired like that?
And is the 560 cap a 560pF? I found it very big.

Yun_Suki · Post by **Yun_Suki** » 24 Apr 2022, 16:10

Ichabod_Crane wrote: ↑24 Apr 2022, 15:06 Thanks.

How the Volume pot could work wired like that?
And is the 560 cap a 560pF? I found it very big.

yes, 560pf
Volume pot... hmmm, yes, there's a bug （corrected now

Ichabod_Crane · Post by **Ichabod_Crane** » 25 Apr 2022, 08:21

Thanks.

Though, I expect a sound too much dull with a 560pF in the feedback loop, I guessed it was a 56pF, but if it was a small cap it would probably a ceramic cap. (The DOD250 and the MXR Distortion+ have no cap or just 10-25pf cap or so). From the demos I saw this pedal sounds a bit shrill.
Are you really sure that cap is right in the feedback loop? Sometime hard clipping pedals are a caps like that in parallel with the diodes.
Anyway, I didn't try the circuit, maybe you did?

I'm sorry for my insistence.

FiveseveN · Post by **FiveseveN** » 25 Apr 2022, 13:20

Capacitor code 560 means 56 pF: 56 * 10^0, which gives a more reasonable cutoff at about 3 KHz.
In other news, holy output impedance, Batman!

Couldn't find the cash for them fancy dual op-amps?

ppluis0 · Post by **ppluis0** » 25 Apr 2022, 13:45

FiveseveN wrote: ↑25 Apr 2022, 13:20 Couldn't find the cash for them fancy dual op-amps?

After a brief search in the web, the price difference found from buy a TL071 respect to TL072 is merely 11 cents of a Dollar a piece...

FiveseveN · Post by **FiveseveN** » 25 Apr 2022, 16:39

Yes, that was the joke

Yun_Suki · Post by **Yun_Suki** » 26 Apr 2022, 00:18

Ichabod_Crane wrote: ↑25 Apr 2022, 08:21 Thanks.
Though, I expect a sound too much dull with a 560pF in the feedback loop, I guessed it was a 56pF, but if it was a small cap it would probably a ceramic cap. (The DOD250 and the MXR Distortion+ have no cap or just 10-25pf cap or so). From the demos I saw this pedal sounds a bit shrill.
Are you really sure that cap is right in the feedback loop? Sometime hard clipping pedals are a caps like that in parallel with the diodes.
Anyway, I didn't try the circuit, maybe you did?

I'm sorry for my insistence.

Actually, 101 and 560 capacitors are not present on this board, but they were present in some early versions，
（sorry，I made a spelling mistake，560 is 56pf，Thank you for correcting me）

: InkedIMG_20220314_180332_LI.jpg (380.73 KiB) Viewed 2950 times

C10 is a 101 capacitor，C11 is a 560 capacitor

bmxguitarsbmx · Post by **bmxguitarsbmx** » 27 Apr 2022, 16:34

FiveseveN wrote: ↑25 Apr 2022, 13:20 ...
In other news, holy output impedance, Batman! ...

True that. And that high impedance makes for a very dependant (on volume setting) presence control. If the order was reversed, and the signal hit the presence circuit before the output volume circuit, the presence would be much more consistent in operation. (Shelf sweeps a wide range depending on volume setting).

Ichabod_Crane · Post by **Ichabod_Crane** » 28 Apr 2022, 08:30

That still makes me perplexed, indeed.
I'm thinking about to build something similar to this pedal, but probably I'll reverse the two pot.
Maybe I'll try it on my breadboard. But I don't know when, don't waiting for me!

SolidGoldFX Super Drive [schematic]