Trem Face question

[markm]

I'm looking at working on the Trem Face from R.G.'s site and the thought has crossed my mind of converting it from positive ground to negative ground. My question is, what could be good subs for the transistors in there?
R.G. feel free to chime in here!! 

[markm]

bumpity bump bump----bumpity bump bump 
Anyone?
Even a guess at this point would make me happy!

[markm]

 

Ha!

I completely stumped the board!!

Well, maybe I can come up with an answer with some experimenting.
In the end though, will I share the info......That is the true question?

Or perhaps the true question is, will anyone even care? 

[GREEN FUZ]

Mark, I`m in severe danger of exposing my ignorance here but isn`t the corrected version already Neg ground?

[markm]

No.
It is a positive ground circuit but, my thoughts are the schem may have an issue or two.

[GREEN FUZ]

Ok, I`ve just been looking at the article on Geofex. Admittedly I`m no expert and I`m not familiar with some of the conventions that R.G uses in his schematics but the factors that lead me to believe it is Neg Ground are his references to reversing the battery polarity and the use of NPN trannies.
This isn`t a challenge I`m just genuinely confused.

What are your doubts about the schem? On his page R.G states that it`s tested and working.

I presume we`ve both been looking at the same article.

http://www.geofex.com/Article_Folders/trem_face/tremface.htm

[markm]

Well, I asked RG if was Negative or Positive ground and he replied that it was a Positive Ground circuit.

have a look;  http://www.diystompboxes.com/smfforum/index.php?topic=57793.0

I have been told by a few owners of original units that this circuit, as the schem reads has issues.
It's a shame that this thread has been overlooked as I have some of the issues apparently corrected and just can't get the LFO to LFO yet but, I'm working on it.......un-assisted as it may.

[GREEN FUZ]

Well, I asked RG if was Negative or Positive ground and he replied that it was a Positive Ground circuit.

Fair enough, can`t really argue with that but I`m still confused.

have a look;  http://www.diystompboxes.com/smfforum/index.php?topic=57793.0

Slightly less confused now.

I have been told by a few owners of original units that this circuit, as the schem reads has issues.
It's a shame that this thread has been overlooked as I have some of the issues apparently corrected and just can't get the LFO to LFO yet but, I'm working on it.......un-assisted as it may.

Good luck.

[markm]

Good luck.

Thanks!! 

[John Lyons]

Mark

Has RG said whether or not he actually made this circuit and that it did in fact work?
I would assume he did as there is a transfer pattern and a whole write up. But maybe not.
Seems funny to to do 99% of the work and post a non working circuit...  But then there are problems with the Neovibe schematic and layout as well... for years!...

Interesting to hear what it sounds like when all this boils down.

John

[markm]

I think somewhere on there it says it works and is verified.
However, I have been in communication with others that state the schem looks as though it would have "issues" and would not function as it is currently.
I am working on trying to confirm any corrections but as of this writing, I have no new info.
Still working on it though.
BTW, just for reference the version I am dealing with is the "improved" version.
If I have the chance this weekend, I am going to put together my own improved version that uses pretty much just the LFO from the Face and see how it works out.

[jrc4558]

The schem here: http://www.geofex.com/Article_Folders/trem_face/tremface.htm
is negative ground. Look at the orientation of capacitors (polar ones)

[oskar]

And so did I think when I first saw it but...
the drawing that follows is more clear on this point.
http://www.geofex.com/Article_Folders/trem_face/tremface2.htm

[markm]

And so did I think when I first saw it but...
the drawing that follows is more clear on this point.
http://www.geofex.com/Article_Folders/trem_face/tremface2.htm

The circuit is Positive (+) Ground.
Just like the Fuzz Face.

[Shepherd]

I built it.  It works really well.  There are some inconsistencies in the schems on different pages but the BOM is correct.

Go to the bottom of this page for some insight:http://www.foxroxelectronics.com/scrap.htm

also:http://www.diystompboxes.com/smfforum/index.php?topic=55762.msg429709#msg429709

[markm]

I built it.  It works really well.  There are some inconsistencies in the schems on different pages but the BOM is correct.

Go to the bottom of this page for some insight:http://www.foxroxelectronics.com/scrap.htm

also:http://www.diystompboxes.com/smfforum/index.php?topic=55762.msg429709#msg429709

Thank you!
What's your opinion on it's sound?
I've read it "ain't that great".   True?

[Dragonfly]

i'm anxiously awaiting the "debug", so i thought i'd give the thread a "bump" ! 

[markm]

Andy,
Ya may have to wait a little bit.
I'm shelving it for now, moving on to something else for the time being.
A break is good now and then don'tcha know!! 

[Dragonfly]

Andy,
Ya may have to wait a little bit.
I'm shelving it for now, moving on to something else for the time being.
A break is good now and then don'tcha know!! 

Yes my friend...I understand completely.   

[King Tubby]

I have one of these, havent touched it in years, might go and fish it out.

If I have time i'll compare it against the schems or just re-trace it