MI Audio - Crunch Box

nooneknows · Post by **nooneknows** » 26 Dec 2008, 23:35

To bypass RF and the 'shrillest' high frequencies part of the signal?
At higher frequencies the impedance of the RC couple in the feedback loop should get lower and the gain should be reduced.

soulsonic · Post by **soulsonic** » 27 Dec 2008, 00:26

I put a three band tone control in it and another opamp stage and all that to drive it. It's way cooler now. I think I accomplished my goal.

Mr. G. · Post by **Mr. G.** » 27 Dec 2008, 03:16

Got a schematic of what you did?

BJF · Post by **BJF** » 27 Dec 2008, 14:00

soulsonic wrote:I put a three band tone control in it and another opamp stage and all that to drive it. It's way cooler now. I think I accomplished my goal.

Hi,

Good on you and call it somethingelse.

I did have one of those that was contributed to the Katrina donation to musicians that lost their gear.

I had at the time a Fulltone OCD of a very low number that had a lot more dynamic response and an Eternity that was the original unit that I wrote a review about, but that also happen to be the only one Eternity that sounds that way? and so this Crunch box had nothing to further offer or it just drowned in the competition- however had it had a different tonecontrol it could very well have held up- oh yes I have my test gear and know what I'd like to hear and so does Michael Ibrahim........

Oh well

Have fun
BJ

devastator · Post by **devastator** » 29 Dec 2008, 21:02

hi,

I did a striplayout of crunch box, I share it with you.

NOT VERIFIED !

paparoni · Post by **paparoni** » 31 Dec 2008, 08:43

do you have any soundclips of your work?

i wish to hear them up..

many thanks..

devastator · Post by **devastator** » 31 Dec 2008, 18:06

Sorry I've just done the striplayout , nothing else.

paparoni · Post by **paparoni** » 01 Jan 2009, 04:38

i mean for everyone..

do you guys have any demos of the clone?

want to hear them..

nooneknows · Post by **nooneknows** » 01 Jan 2009, 10:19

Paparoni, try a simple search in YouTube, a lot of people posted videos about it

paparoni · Post by **paparoni** » 02 Jan 2009, 10:22

ayt thanks

devastator · Post by **devastator** » 02 Jan 2009, 18:07

yeah, you can find a lot of vids with Proguitarshop.com or tonefactor.com on youtube.

nooneknows · Post by **nooneknows** » 02 Jan 2009, 20:34

I didn't know http://www.tonefactor.com, I've just had a look. In the Crunch Box page they says: "MI Audio Crunch Box. Simple and straight forward, just gain, tone and volume. The Crunch Box has some similarities to the Tube Zone, in the sense that the design is based on a multiple clipping architecture (the signal is clipped 3 times)".
...multiple clipping architecture? in the schematics I know I can only see a pair of LED. Am I missing something?
BTW the sound recorded in the video seems different from the one I remember coming fro my clone before I modded it...

soulsonic · Post by **soulsonic** » 02 Jan 2009, 23:13

nooneknows wrote:I didn't know http://www.tonefactor.com, I've just had a look. In the Crunch Box page they says: "MI Audio Crunch Box. Simple and straight forward, just gain, tone and volume. The Crunch Box has some similarities to the Tube Zone, in the sense that the design is based on a multiple clipping architecture (the signal is clipped 3 times)".
...multiple clipping architecture? in the schematics I know I can only see a pair of LED. Am I missing something?
BTW the sound recorded in the video seems different from the one I remember coming fro my clone before I modded it...

They must mean that it's clipped 3 times because when the gain is up, the opamp stages are distorting and clipping too. So, it's opamp1 clipping, opamp2 clipping, and then the diodes clipping. You could remove the diodes from the circuit and it would still have much distortion (and be VERY loud!)... but it might be a very ugly distortion.

That could be something to try...

HEAD · Post by **HEAD** » 02 Jan 2009, 23:54

soulsonic wrote:
nooneknows wrote: That could be something to try...

No, it isn't. Tried that allready - it is indeed some kind of a ugly distortion. The clipping section is just fine as it is.

Regards
HeAd

DimebuGG · Post by **DimebuGG** » 03 Jan 2009, 03:43

here's my own layout with PCB mount pots. Enjoy!...IC is National's LM833..

nooneknows · Post by **nooneknows** » 03 Jan 2009, 08:11

HEAD wrote:
soulsonic wrote: That could be something to try...
No, it isn't. Tried that allready - it is indeed some kind of a ugly distortion. The clipping section is just fine as it is.

maybe it is worth trying with different opamps, we could find one better sounding in distortion...
thx

HEAD · Post by **HEAD** » 03 Jan 2009, 11:20

nooneknows wrote:
HEAD wrote:
soulsonic wrote: That could be something to try...
No, it isn't. Tried that allready - it is indeed some kind of a ugly distortion. The clipping section is just fine as it is.
maybe it is worth trying with different opamps, we could find one better sounding in distortion...
thx

As nobody is probably gonna be harmed so just go ahead and try!:) As far as I can say it sounded neither good with a TL072CP nor with a NE5532AP nor with the LM833.

Regards
HeAd

quaternotetriplet · Post by **quaternotetriplet** » 27 Jan 2009, 04:19

is there a possible way to make it like wampler pinnacle??

quaternotetriplet · Post by **quaternotetriplet** » 28 Jan 2009, 07:40

any mods to increase the gain??

Mr. G. · Post by **Mr. G.** » 28 Jan 2009, 11:03

I can't imagine there not being enough gain in the crunch box for any possible situation.

MI Audio - Crunch Box [traced]