SMD Little Big Muff!

bumblebee · Post by **bumblebee** » 15 Oct 2007, 04:37

hey, heres a schem of the required changes you need to make to get rid of the mud in a LBM.
simply, its just the NYC muff after these changes...minus the ferrite beads of course.
anyways, here ya go.
oh, btw, i done mine and it sounds great.

changes in DARK RED amount to 8 resistors and 3 capacitors.
i didnt bother with SMD parts as i couldnt get them today so i used 1/4 watt resistors and MKT 1uf caps.

AL · Post by AL » 15 Oct 2007, 13:53

SMD parts and several pots. So... this is the new re-issue LBM correct? Just trying to clarify for us old guys.

AL

bumblebee · Post by **bumblebee** » 15 Oct 2007, 21:45

yes thats right.

Dirk_Hendrik · Post by **Dirk_Hendrik** » 16 Oct 2007, 08:15

I may be wrong but nevertheless I have problems with the idea of increasing cap size so get rid of muddyness. Please clarify?

bumblebee · Post by **bumblebee** » 16 Oct 2007, 09:20

that was my thought too but now the above schematic, with the changes is exactly the same as the current NYC BMP and that aint muddy.
i dont know any technical reason for it but it works.
in comparison from a stock LBM to this, well, there is no comparison...its night and day and it sounds almost 100% to the current NYC BMP, a little different but that can be expected i spose but its the same schematic none the less.

nooneknows · Post by **nooneknows** » 04 Nov 2008, 17:48

Hi,
I'm interested in but the image of the mods is not visible any more, please, could anyone post it again?
thank you

bumblebee · Post by **bumblebee** » 04 Nov 2008, 21:42

Sure, heres the schem again.
The red is very dark, I need to re-do it so its clearer but you can work it out.
In all its 3 caps and 8 resistors that need swapping.

nooneknows · Post by **nooneknows** » 05 Nov 2008, 08:42

thank you so much!
(now the hard part is soldering the correct values on the board...

!)
M

nooneknows · Post by **nooneknows** » 07 Nov 2008, 07:12

I opened mine and the values are a little diferent: my board (labeled EC-D2r-E) has C6 1uF, C7 2.2 uF, C8 2.2 uF (!), R16 120, R10 120, R8 22k and more
I think I have to redraw the circuit...
thank you

nooneknows · Post by **nooneknows** » 12 Nov 2008, 20:45

This is the Little Big Muff version EC-D2rE
BumbleBee, I used your layout adding the values I've found in mine, thank you!
ciao

bumblebee · Post by **bumblebee** » 12 Nov 2008, 21:40

No problem, i think I'll re-upload this schematic in PNG form cause this jpg is shity quality.

nooneknows · Post by **nooneknows** » 12 Nov 2008, 21:47

BTW, mine sounded bad, dark and dead. I replaced C3, C5, C6, C7, C13 (all electros) with 0.1uF caps and C8 with a 10nF.
The pedal is now sparkly and alive and it's less compressed. I think I'll try replacing some of them with a higher value (maybe a 0.22uF, I want to find the right balance) however I like it much more than before.

bumblebee · Post by **bumblebee** » 12 Nov 2008, 22:05

Heres the stock XO LBM schem and the schem with the required changes again, in a clearer format.

nooneknows · Post by **nooneknows** » 14 Nov 2008, 08:41

The scheme I posted before is wrong.
Following Bumblebee's scheme and markings, I thought the tone cap to ground was 2.2uF, but I was wrong, it was indeed the third transistor output cap.
That said, I put a 10nF as output capcitor in place of the original 2.2uF. Big surprise: it sounds good, really good.
With my humbucker equipped strato the sounds (gain set high and tone at noon) is very close to Nirvana's "Breed" distorsion.
I think I'll leave it as is

Paul Marossy · Post by **Paul Marossy** » 29 May 2009, 02:14

So, am I correct in assuming that this Little Big Muff uses SMD components exclusively?

theblackman · Post by **theblackman** » 29 May 2009, 05:10

maybe OT, but how come there are so many broken images from photobucket on this site now? Do schems violate their terms??

lolbou · Post by **lolbou** » 29 May 2009, 05:22

Paul Marossy wrote:So, am I correct in assuming that this Little Big Muff uses SMD components exclusively?
So, am I correct in assuming that this Little Big Muff uses SMD components exclusively?

It does indeed, but there are TO-92 transistors in it...

sfx · Post by **sfx** » 29 May 2009, 05:30

Paul Marossy wrote:So, am I correct in assuming that this Little Big Muff uses SMD components exclusively?

Hi Paul,

It's all SMD with the exception of the transistors (Fairchild BC550B's in my case), electros, and a polarity protection diode.

For reference, the PCB on my LBM is labelled EC-D2rE.

Paul Marossy · Post by **Paul Marossy** » 29 May 2009, 15:23

Ooo... so doing any mods on it would be pretty tricky. For me at least.

jtn191 · Post by **jtn191** » 19 Jun 2014, 21:04

I was cleaning my room and found this pcb...thought I'd upload some pics for posterity...
This circuit was not my cup of tea