Mad Prof Stone Grey

[Kipper4]

Heres the deal.
From a previous post a kind soul pointed out this pedal which looks intresting.

some of the parts are however hard to get or expensive
What could be possible more easily available substitutes

CD4069ube i can get at Tayda. (best pricing i've seen)
transistor 2N3819
( I read in a search MPF102 might be a possible replacement for this now defunct part) opinions or alternative suggestions welcome.

TL051
could a TL072 replace this part if not then again suggestions are welcome please.

Heres a link to some stuff about this build .     


http://revolutiondeux.blogspot.co.uk/2012/01/mad-professor-stone-grey-distortion.html

[Kipper4]

Another question.
Are these cmos chip a feature of modern type non clipping distortion build?

Anybody got some other ideas for builds that come close to this sort of sounds?

[Kipper4]

anyone built the 49er or red rooster?

http://www.aronnelson.com/gallery/main.php/v/WGTP/Red+Rooster.GIF.html?g2_imageViewsIndex=1

[pappasmurfsharem]

I'm thinking about the same pedal after seeing that recommendation on the other thread.

You'd want a 051, 061, 071, or 081

The 072 is a dual op amp

You need a single

Another cmos type pedal is the double d from ROG, which I believe had two channels.


Also I don't injure if your still just veroboarding or if you etch now also but the mad bean forum has pcb layout

[pappasmurfsharem]

Double post

[Ice-9]

I have just had a quick search and all three components you listed are easily available and cheap ??

Here in England
TL051               £0.49
CD4069UBE       £0.15
there available from RS components

2N3819             £0.99
From Maplins.

[duck_arse]

wow, the Vgs of the 2n3819 is specified as 0V5 to 7V5. that covers the bf245A, B and C! looks like just about anything will go in there, though they'll all sound different, probably. you know what that means, kipper .....

the 4069 can be replaced with a 4049UB or UBE, or a 4007, which will require some thought. watch your pinouts.

[Kipper4]

Thanks guys
this build is going on hold until i can make another order.
meantime i'll try the tonfreaks severe just for kicks

[roseblood11]

You can get most parts here:
http://uk-electronic.de/onlineshop/index.php?language=en

- The 2n3819 is just used as a clipping diode - try any other JFET or whatever you like

- The TL051 can be replaced by any similar SINGLE opamp, like TL071 etc. The TL072 is a dual opamp with a different pinout. I used the OPA134, and my built sounds exactly like the original pedal. (I retraced the Stone Grey and compared it with my clone side by side...)