http://www.diystompboxes.com/smfforum/index.php?topic=32415.0
Here's the original thread/schem from a year ago, it's taken me this long to get to it !
( sorry Joe )
I have it 90% there, but have the following :
1- lots "o" hisssss
2- 2 pictures of the pot wiring, I've used the one above which seems backwards
3- With pot at minimum ( max ) total cut out of sound, pot's also quite noisey when adjusted.
4- A very wierd bias, as per the schem, Ge NPN at 4v giving a very "hard" sound overall.
Just wondered if anyone's sorted one out ?
Many Thanks,
Marty.
No worries, just got it working perfectly, had a bad trim pot, one solder
bridge ( miniscule . ) and used J201's
J201's @ 6.6v ( used 50k trimmers )
OC140 Ge NPN collector ( or emitter depending on how you look at it ) @ 4.6v ( tuned in with new 50k trimmer )
Fabulous Joe, great "amp-like" tones using the tone stack and gain controls
from clean through to "edge of breakup" and on to "Big Muff" sounds too :D
Really great sounding circuit .....
I wish that I had made it a year ago !! :icon_redface:
MM.
Marty,
U got a layout for it??
Quote from: markm on May 15, 2006, 06:58:20 PM
Marty,
U got a layout for it??
No, not really, just stuffed in onto a piece of stripboard 10 strips x 28 holes.
It's not a tough one, only three trannies :D
It could be "neater" but it works !
..... quite a few pots though !
I was just wondering as I have been trying to develop some of my own layouts......
I'm not overly successful yet but, I will be eventually I hope!
Quote from: markm on May 15, 2006, 07:07:48 PM
I was just wondering as I have been trying to develop some of my own layouts......
I'm not overly successful yet but, I will be eventually I hope!
Go for it !!
Check my Joe Davisson "Vulcan" layout in my gallery, against the schematic
You'll see exactly what's going on, I don't "twist" the circuit that much, just
schem from left to right --> stripboard left to right
So long as you make all the connections and cut the strips as you go, it's not
hard ... well if I can do it then anyone can .... right ! :icon_wink:
MM.
Marty is this tone on the order of the Vulcan or Blackfire, or a little more tame the those? I must have missed this one along the way.
Quote from: MartyMart on May 15, 2006, 07:17:07 PM
Quote from: markm on May 15, 2006, 07:07:48 PM
I was just wondering as I have been trying to develop some of my own layouts......
I'm not overly successful yet but, I will be eventually I hope!
Go for it !!
Check my Joe Davisson "Vulcan" layout in my gallery, against the schematic
You'll see exactly what's going on, I don't "twist" the circuit that much, just
schem from left to right --> stripboard left to right
So long as you make all the connections and cut the strips as you go, it's not
hard ... well if I can do it then anyone can .... right ! :icon_wink:
MM.
Well, actually I've been trying to develop my own to etch although, I have traced a couple of the Veros and made
circuit boards with them. In fact, I think one was yours!!
Thanks Marty!!!
I put an OC44 from Small Bear in the GE position on mine. It's way more 'open' than with any of the other Ge's that I had sitting around. If you have the means, I highly recommend it.
Ry
Maybe I missed it Marty, but did you modify the pots like Joe did?
Quote from: jmusser on May 15, 2006, 09:00:34 PM
Marty is this tone on the order of the Vulcan or Blackfire, or a little more tame the those? I must have missed this one along the way.
It's a little more tame, but it's got a very BIG and open sound, just seems like you have a big amp
when it's on !!
Sounds like a good Jfet sim & a good fuzz in one :D
Quote from: Dave_B on May 15, 2006, 11:07:11 PM
Maybe I missed it Marty, but did you modify the pots like Joe did?
We did a "trade", Joe sent me the special pot and I sent some goodies ... good old fashioned "Barter" !
Quote from: Ry on May 15, 2006, 10:10:39 PM
I put an OC44 from Small Bear in the GE position on mine. It's way more 'open' than with any of the other Ge's that I had sitting around. If you have the means, I highly recommend it.
Ry
The Ge is supposed to be "NPN" !
An OC140/CV7112 is very close to OC44 but in NPN form, I have a nice one, gain 110 hfe and no leakage in there ...
QuoteThe Ge is supposed to be "NPN" !
An OC140/CV7112 is very close to OC44 but in NPN form, I have a nice one, gain 110 hfe and no leakage in there ...
Yeah, you're right :icon_redface:. I must have bought the NPN transistor above the OC44 in the Small Bear stock list and used that. It was more than a year ago...