MI Audio - Crunch Box

lynessmy · Post by **lynessmy** » 24 Jul 2008, 07:14

audioguy wrote:
lynessmy wrote:I have a layout too in my blog...
I built one from your layout today and it didnt work. I'll do some testing on it tomorrow... but its dead silent.

I'll post some info tomorrow.

My build had no problem.

Don't forget those jumper wire, there are 2 there.....

just in case you didn't notice.
I'm doing REV2 now.
Hopefully it fire up at the first shot.
Then this is the one i will give him a house (enclosure).

Post by **audioguy** » 24 Jul 2008, 15:18

Yeah the jumpers were the first thing I looked at to make sure I found them all... they look good. I dont know if I'll have time to trouble shoot it today. I might wait till you do Rev2- this is a small build. It would probably take less time to rebuild then it would to troubleshoot the one I've got done already. Its probably something simple- I'm not even getting the on board LEDs to light up.

thanks for the cool layouts!!

lynessmy · Post by **lynessmy** » 25 Jul 2008, 02:02

audioguy wrote:Yeah the jumpers were the first thing I looked at to make sure I found them all... they look good. I dont know if I'll have time to trouble shoot it today. I might wait till you do Rev2- this is a small build. It would probably take less time to rebuild then it would to troubleshoot the one I've got done already. Its probably something simple- I'm not even getting the on board LEDs to light up.

thanks for the cool layouts!!

Version 2 is up at my blog....

Valoosj · Post by **Valoosj** » 25 Jul 2008, 20:31

Deric wrote:Thanks guys. Here is the updated layout with the Presence wiring corrected.........

hmmmm...not sure why but the thumbnail still shows the wrong layout. If you click on it though the link shows the correct one.....

I built this pedal according to the above layout. The only difference is that I used normal film instead of the Tantalums. Does this matter?? I can replace thim if you think so. The presence knob is a trimmer in my version. Haven't played around with it. Might do that soon.

Here are some pics.

soulsonic · Post by **soulsonic** » 25 Jul 2008, 20:38

Cool glow effect with the spider!

I think film caps may even sound better than Tantalum.

Valoosj · Post by **Valoosj** » 25 Jul 2008, 20:40

soulsonic wrote:Cool glow effect with the spider!

I think film caps may even sound better than Tantalum.

Ok. And thanks

One of my best finished pedals so far.

underage · Post by **underage** » 28 Jul 2008, 10:47

paperhouse wrote:here's my build:

i mounted the clipping LED's externally as the eyes and they light up with your pick attack:

sounds awesome with the gain cranked but it's a little dull when the gain is lowered. it prefers humbuckers, but i think that's the nature of marshally pedals. cool pedal and recommended build.

Wehick layout u used ?? thanks

underage · Post by **underage** » 28 Jul 2008, 10:55

audioguy wrote:Yeah the jumpers were the first thing I looked at to make sure I found them all... they look good. I dont know if I'll have time to trouble shoot it today. I might wait till you do Rev2- this is a small build. It would probably take less time to rebuild then it would to troubleshoot the one I've got done already. Its probably something simple- I'm not even getting the on board LEDs to light up.

thanks for the cool layouts!!

what is the difference between version 1 and 2 ? thanks

JeawJaw · Post by **JeawJaw** » 30 Jul 2008, 12:09

Here my build..

it is Crunch box clone(PCB and Schematic) . but sound between original and clone was little different.
I like it.

JeawJaw · Post by **JeawJaw** » 31 Jul 2008, 22:07

two yellow capcitor in red square. What 's type capacitor ?

I guess it may be tantalum, or ceramic multilayer.

anyone have information or more gut , please.....

Torchy · Post by **Torchy** » 01 Aug 2008, 07:14

From the photo, theyre dipped ceramic multilayer.

JeawJaw · Post by **JeawJaw** » 01 Aug 2008, 10:23

More gut..

thank you Torchy

johanwastaken · Post by **johanwastaken** » 01 Aug 2008, 18:58

In the schematic, there is something called "V1 006P". What kind of part is that?

nooneknows · Post by **nooneknows** » 23 Aug 2008, 21:31

Hi,
I've built the pedal, 1st version posted without the presence: very muddy, much more than I expected, even if I read the posts before.
is the version with the pres pot clearer? anybody tried both schems?

I believe that double final filter could be one of the usual suspect, I was thinking about getting rid of R7, R8, R9, VR2, C8 and C9, and put instead a Mark Hammer SW ton control, with a 22k pot, a 10nF cap and a 1K8 res. I'll try it as soon as possible.

The crunch box is very close to the Guv'nor pedal (except the tone control), I've calculated the same frequency cuts. In the original Guv'nor schem there's a 22k and 470 pF going to ground after the volume, the crunch box hasn't... why? it seems a low pass filter (with a ft around 15KHz, I believe), maybe to make the pedal less shrill?

new_pedal · Post by **new_pedal** » 24 Aug 2008, 09:05

johanwastaken wrote:In the schematic, there is something called "V1 006P". What kind of part is that?

it is 9V battery.

nooneknows · Post by **nooneknows** » 27 Aug 2008, 19:02

nooneknows wrote:I've built the pedal, 1st version posted without the presence: very muddy, much more than I expected, even if I read the posts before.
is the version with the pres pot clearer? anybody tried both schems?

I believe that double final filter could be one of the usual suspect, I was thinking about getting rid of R7, R8, R9, VR2, C8 and C9, and put instead a Mark Hammer SW ton control, with a 22k pot, a 10nF cap and a 1K8 res. I'll try it as soon as possible.

IT WORKS!!! it suddendly became one of the best overdrive I've ever heard and built!

referring to the Matsumin schematics:
- 1uF film in place of the 2.2 uF electro C7
- 1K8 R in place of the 100R R7
- a B25K (tone) pot in place of VR2 and R8 (one external lug to R7, the other external directly to the volume lug), the central lug of the pot goes now to a 10nF cap, then to ground
- got rid of R9 and C9

it screams with a Marshally crispy vibe and it cleans up with the guitar volume pot very, very well.
It has only a problem, it is way too much loud, I think I have to sbstitute the 100K pot with a 68K fixed res to a A25K pot (yes, it is that loud)

I'd like to know if anyone wanted to try this mod, I've check it with my peavey classic 30 and my Jcm800 combo, both works ok, I'm curious about using it with amp less prone to stompboxes (a Twin or some SS amp for example)

thank you,
ciao

Marcello

Mr. G. · Post by **Mr. G.** » 01 Oct 2008, 18:26

I've got a Crunch Box v2, and have been wanting to make a clone of it, but with an added Marshall tone stack. So, I took Madbean's stripboard layout, and made the v2 changes per Ripdivot's schematic, and added a Marshall tone stack that I got from the Tone Stack Generator.

This was my first time altering a circuit, and also using the DIYLC. So, could someone take a look at what I've done, and let me know if I did it right, or if I need to change some things. Also, would there be a way to add the tone stack without taking up so much extra space?

Here's my layout: >Krunk w/ Marshall Tone Stack<

Mr. G. · Post by **Mr. G.** » 01 Oct 2008, 19:28

One more question... The crunch box is supposed to be able to be used with up to a 24v power source. Would this version be safe to use with an 18v power source?

snoof · Post by **snoof** » 01 Oct 2008, 19:59

depends on the voltage rating of the caps that you used.

Mr. G. · Post by **Mr. G.** » 02 Oct 2008, 13:37

I just found a pretty nifty schematic editor called >KiCad<. So, I tried to copy the schematic I used, and then added the tone stack. Could someone take a look at it to see if I did it correctly, and if the strip board layout I did matches up with it?

Here's the layout: >Crunch Box w/ TBMP schematic<

btw, The electrolytic capacitor symbol looked different in this program, so I'm not sure if I oriented them correctly or not.

I should also note that this is my first time to ever work with and modify a schematic.

MI Audio - Crunch Box [traced]