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Original MXR Blue Box Schematic

Started by thadc, October 19, 2010, 06:43:18 AM

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thadc

October 19, 2010, 06:43:18 AM
Trying to build a clone of the original, not the reissue (I have one of those). The only schematics I can find are for the current PCB. Can't seem to find clear pictures of the trace side of the board or original schematic anywhere. Attached is where I am at. Circled are my three trouble areas where I can't clearly see the traces. If you happen to have a clear shot of the traces on an original board or a schematic of the original I would really appreciate it.

blooze_man

#1
October 19, 2010, 08:28:31 PM
Tonepad has a schematic and parts list for the original and reissue.
Big Muff, Trotsky Drive, Little Angel, Valvecaster, Whisker Biscuit, Smash Drive, Green Ringer, Fuzz Face, Rangemaster, LPB1, Bazz Fuss/Buzz Box, Radioshack Fuzz, Blue Box, Fuzzrite, Tonepad Wah, EH Pulsar, NPN Tonebender, Torn's Peaker...

ddpawel

#2
October 19, 2010, 08:46:04 PM
Not exactly the same. Tonepad has dual op-amp versions only with few differences. Here you can see two single op-amps and probably other things that are not included in tonepad pdf file.

Govmnt_Lacky

#3
October 19, 2010, 09:15:07 PM
Couldn't you take what you have above regarding the layout and bounce that off of what Francisco has at Tonepad and just "connect the dots" so to speak?   :icon_wink:
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edvard

#4
October 20, 2010, 08:47:48 AM
Couldn't sleep, so I thought I'd take a crack at this.
Found a couple things in the top circle, and one in the middle circle.



Sleepy now, hope this helps.
All children left unattended will be given a mocha and a puppy

Thomeeque

#5
October 20, 2010, 10:03:48 AM
Is there audible (or other user-point-of-view) difference between the original and the reissue? Cheers, T.
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thadc

#6
October 21, 2010, 10:44:56 AM
Thanks edvard.  That is a start.  Not sure what the sound difference is between the re-issue and the original since I don't currently have both to make a comparison. Would like to know for myself though - hence the attempt at building a clone as close as possible to the original.

edvard

#7
October 23, 2010, 09:54:33 PM
from what I was able to track, there appears to be no difference but the single vs. dual opamp.
I'm sure from an economic standpoint, MXR (Dunlop?) made a wise choice there, but as far as the actual circuit is concerned there doesn't appear to be much difference.
I haven't had a chance to work any farther on this, but I will when I get another bout of insomnia ;)
All children left unattended will be given a mocha and a puppy

ppaappoo

#8
October 23, 2010, 11:35:08 PM Last Edit: October 23, 2010, 11:39:43 PM by ppaappoo
I found this, maybe helps you.




Taken from this web http://music-electronics-forum.com/t22033/ likes the same post
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