pwned overdrive

[dano12]

Working up a Voodoo Labs Overdrive clone with a tone stack and MOSFET clippers. I hope to breadboard it this weekend but wanted to see if you folks have any pointers/see any errors....Does it matter if C11 de-coupling cap goes after the tone stack?

[Seljer]

I don't think you even need the decoupling cap, wouldn't all the DC be blocked by C7 C9 and C10?

[JimRayden]

Nice name.

---------
Jimbo

[MartyMart]

Looks fine, dont know how much volume will be left after the tone stack, you may need
a BJT or single opamp vol recovery ... BMP stage should work ?

MM

[MikeH]

I love the MOSFET/Ge clipping style.  I just built it into a TS design.  Where has it been all my life?!

[anti-idiot]

looks nice
B-Log/A-Linear right?
i'm a little confused bout the gain...
could it be better if ya' add a resistor (say 1k) in series? sorry, im just guessin...

sorry for the off-topic, what software did ya used to do that schematic? it looks pretty cool (im using Express and mine looks like poo)

[JHS]

A small limiting resistor between Vr1 and C3 , app. 2,2k-4,7k, would be a good idea to prevent sqealing when the gain pot is maxed.
I don't think it needs a recovery stage, the VL OD produce a lot output vol.,  but I would alter the cap values a bit, it's s overdrive not a tube preamp. The frequency response of the circuit is limited by the RC-networks in the FB-loops to 5kHz. so the access frequency of the treble pot seems to be a bit to high. The tone stack blocks all DC so I would drop C11.

I would add a buffer before the tone stack and increase the cap values by factor 10 and decrease the pot values by factor ten.

JHS

[dano12]

looks nice
B-Log/A-Linear right?
i'm a little confused bout the gain...
could it be better if ya' add a resistor (say 1k) in series? sorry, im just guessin...

sorry for the off-topic, what software did ya used to do that schematic? it looks pretty cool (im using Express and mine looks like poo)

Correct on the A/B tapers. 1k in series with what? Sorry, can't tell what you mean...

I do all my schematics in Microsoft Visio. One you get your templates built up, it does a nice job

[Mark Hammer]

Far from not needing the recovery amp, I suspect you'll need to up the gain on the recovery amp a bit, given the amount of passive loss the tonestack will produce.  You'd like to be able to get some appreciable output level at any and all tone settings without having to dime the gain control, so I suspect that raising the gain in stage 2 by dropping the value of R10 might be called for.  Try 22k instead.  That will give you a gain of 7.8 instead of 4.2.  Not a huge leap but a help just the same.  If that ain't enough, then 18k oughta do it.

[anti-idiot]

1k in series with what? Sorry, can't tell what you mean...

I do all my schematics in Microsoft Visio. One you get your templates built up, it does a nice job

Vr1 and C3, as JHS stated. with 2k2 u'll have a gain of 214.64, with 4k7 u'll have a gain of 101. (ive learned this by readin Mark, if he suggest u something, u should think about it, he's The Man (shares this title with RG, Andrew and a long etc.)
Since u r using Mosfet's and they tend to charge very slow (sorry for my bad english) i think 2k2 will be just fine (try it first, as mark said, the tonestack will suck a lotta signal). or maybe u should try a 4k7 instead of 47k (r10). i'm just guessin (the amount of recovery gain will be 39) cos i dont know how it will mess with your tone.

Is Visio freeware? looks too good to be free...

[choklitlove]

Is Visio freeware? looks too good to be free...

not sure if it's free, but most freeware is too good to be free!

[lovekraft0]

Don't know if it was deliberate or not, but the way you've got the MOSFETs oriented, you're clipping the body diode, not the MOSFET - you'll need to reverse the polarity of the 1N34s if you want the MOSFET to clip.

[rockgardenlove]

Sorry to bust any bubbles, but the past tense of pwn is pwnt, with a T and not an ED.

Grammatical mistakes in pedal names=nono.

[RaceDriver205]

Whatever, "Overdriveyness" would be awesome to put on a pedal. I also claim "Phaserish", "Distortered", "Reverbfull", "Wahification" and "chorusified".

[Paul Perry (Frostwave)]

Is Visio freeware? looks too good to be free...

not sure if it's free, but most freeware is too good to be free!

http://www.gnome.org/projects/dia/ is an attempt to make a 'free' version of Visio.
I have seen references saying it works OK, but I havn't used it myself.

[dano12]

Sorry to bust any bubbles, but the past tense of pwn is pwnt, with a T and not an ED.

Grammatical mistakes in pedal names=nono.

Harkening back to my Quake days...

The verb to pwn (past tense: pwned, pwnd, pwn'd, pwnt, pooned) as used by the Internet gaming subculture, means to beat or dominate an opponent. While it probably originated as a typing error of the word own, it is now used intentionally by many members of the subculture. The term has become so ubiquitous in Internet circles that it is often used outside of gaming contexts; for example, "He just got pwned in that debate" or "The hunters pwned that bear."
en.wikipedia.org/wiki/PWNED

[anti-idiot]

nice, but dont forget the resistor between Vr1 and C3.
i think the diodes are ok (look at the Shaka schematic). Lovekraft, are u sure bout the diodes thing? cos i saw the saka schems, and i think they r ok. the only time i saw the diode in reverse polarity, was in Jack's article 'bout mosfets and zeners.

http://www.diystompboxes.com/pedals/shaka3.jpg

http://www.muzique.com/lab/zenmos.htm

[Fuzzy-Train]

Sorry to bust any bubbles, but the past tense of pwn is pwnt, with a T and not an ED.

Grammatical mistakes in pedal names=nono.

LOL When it comes to internet lingo/slang, I think grammar and even proper spelling flew out the window a long time ago.

[jayp5150]

Whatever, "Overdriveyness" would be awesome to put on a pedal. I also claim "Phaserish", "Distortered", "Reverbfull", "Wahification" and "chorusified".

I do this stuff intentionally as well.  When I re-boxed my chicken salad, it is now labeled "Trowerrific: modulatifierish effect"

[aron]

Nice schematic!

It's been a while since I used my VL overdrive but I remember if being "darker" than most overdrives. In addition, the MOSFET clippers might make it even darker. Not sure. You will have to try it.