MN3007 version eh clone theory...

pinkjimiphoton · January 11, 2012, 09:05:41 PM

hi guys, getting close to ready to wire it up....just barely fit it in a 1590bb!!!

gonna millenium bypass it in stereo, think this will fly as a wiring for the switch?

here's a couple pics of the progress...

still gotta drill it for the dpdt chor flange/vib flange switch (right between the two output jacks i think)

and i THINK i can fit the bypass daughter board in just to the right of the 3pdt...

man....toughest pedal i've tried yet...scared!!! lol

pinkjimiphoton · January 11, 2012, 09:56:32 PM

gigimarga · January 12, 2012, 01:41:38 AM

Congratulations Jimi! Very nice work!!!
How do you set the trimpots? Have you tried any mods?

pinkjimiphoton · January 12, 2012, 10:02:46 AM

thanks bro...

here it is all wired up (except for the led/millenium bypass part, gotta go hit radio shack for a couple parts)...haven't fired it up yet, gonna do that a little later after my girl wakes up.

i am hopeful it's gonna work...sometimes my builds do, sometimes they don't. this one, i put a lot of time into figuring out how to fit it all in the box, quapdruple checked everything as i went, so with a little luck, i'll have something good to report on later today...thanks for the help and encouragement!

the only mod i did was the "stereo" one, but the original was stereo...not sure if this is the same, or a re-working of a small clone, but can't wait to have at it!!!!

pinkjimiphoton · January 12, 2012, 04:36:10 PM

it's alive, It's Alive, IT'S ALIVE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

had to do a little debugging, i had forgotten to solder one ic pin and had an almost microscopic bridge between two rails.

but it's alive, sounds absolutely just like i remember my original sounding, but with less noise.

i couldn't find a reverse log 1 meg pot, so i wired the rate pot backwards ...works great.

took a while to find a happy medium with the trimmers...i found the chorusing/flanging happened about 1/2 way on the bias, and the two gain trimmers had to be opposed at extremes to get close to unity gain (it's just a tad less).

there's NONE, i mean ZERO of the noise the eh reissue had. it's clean, quiet, and liquid.

thanks to cathexis and gigimarga, and mark hammer among others for helping me figure this thing out.
'
i used cathexis's layout, it works 100% perfectly, but is a TRUE stereo chorus, unlike the original which had an effect and a "dry" output.

sounds absolutely sick...i can't believe how quiet it is in operation. loving it.

i wired the stereo out direct to the second jack, and used a simple normal 3pdt bypass. worked great.
i'll hardly ever use it in stereo, so figured why bother going thru the hassle of a daughter board.

run it with an 18v wallwart for a dunlop brick i got off evilbay for like 15 bux shipped.

and wouldn't ya know it, i went out and bought the nte replacement for the mn3007, and today when i wired it up, the new 3007's came in.

figures...the nte chip was 10 bux!! lol

clips to follow...i am so psyched i am freakin' out a little.

pinkjimiphoton · January 12, 2012, 05:16:41 PM

done.

clips to come!!

gigimarga · January 15, 2012, 04:33:46 PM

Congratulations again pinkjimphoton! And thank you very much for your fabulous demo of Uglyface...it was for the first time when I like that strange effect!

On the other side, Paul Nelson have proposed some very interesting mods of Clone Theory here: http://sites.google.com/site/electroconducive/ehxclonetheory...but it's not very clear for me which are tested and OK and which are not...and I don't want to make a stupidity, because I like it very much as it is now

In the next days, I will build the stereo part too...even I don't have 2 guitar amps

Best regards,
Radu

pinkjimiphoton · January 15, 2012, 05:59:18 PM

hi radu, i put up another thread here where you can hear it:

http://www.diystompboxes.com/smfforum/index.php?topic=95577.0

i am loving it...the trimmers are pretty crucial to get it dialed in right i found.

the stereo mode is hip!! sounds really good, but it's NOT like the original...the original was just a dry output, i don't even think it was buffered!!
this is TRUE stereo, and sounds absolutely luscious.

thinking of doing the delay time mod and variable feedback mod, but right now the only complaint i have is it's hard to get to unity gain...if you put dirt before it, even if the dirt pedal is pegged, the volume doesn't change, unlike the original...this seems companded somehow, but i think it's worth it cuz there's so much less background noise...the originals were like "whooooooooshhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh" when they were on, this one is dead quiet!

personally, i don't think the other mods are all that hip to be all that useful. but that's just me.

pinkjimiphoton · January 16, 2012, 11:55:48 PM

the clone theory needs a make up gain stage after the circuit if you are gonna true bypass it.

worked this up for it, works great...pretty much any ebc npn will be fine.

special thanks to joe gagan for helping me figure this out!!

works great, low noise, can go slightly ABOVE unity if needed. hope it helps someone down the road.

peace.

pinkjimiphoton · February 06, 2012, 03:52:26 PM

it works, it's killer, i love it!!!

frank_p · February 06, 2012, 04:27:06 PM

Great demo and work.
Really nice.

pinkjimiphoton · February 06, 2012, 05:09:05 PM

thanks frank!!

newfish · February 06, 2012, 05:23:18 PM

Some lovely analogue 'sea-sickness' going on there!

Think I'll go put some 'Floyd' on... Cheers!

pinkjimiphoton · February 06, 2012, 05:38:50 PM

you should build one...it's one of the cooler mod pedals of history imho!!

it LOOKS daunting on vero, but it's really not all that bad!!

pinkjimiphoton · February 08, 2012, 09:53:20 PM

BUT.......

http://www.diystompboxes.com/smfforum/index.php?topic=95996.0

pinkjimiphoton · March 25, 2013, 11:47:46 PM

i'm revisiting this circuit,
and discovered the vero is off a little that is on toppopicione's site... as shown, it has it doesn't show where to connect the chor/vib wiper!!

i will post the fix as soon as i figure it out.
the problem is with the chorus/vibe switch, as shown on the original vero and my copy, it's wrong. it's CLOSE, but the switch terminal connections are listed long.

i've just about got it sussed tho. i've learned enough i think in the last year, i can get it working better than it was and hopefully solve the noise issue i had which i believe to be a combo of poor wiring technique, and not having big enough current limiting resistors on the led's ... i think that's where most of the noise was coming from.

stay tuned...

Scruffie · March 26, 2013, 12:18:36 AM

Quote from: pinkjimiphoton on March 25, 2013, 11:47:46 PM
i'm revisiting this circuit,
and discovered the vero is off a little that is on toppopicione's site... as shown, it has it doesn't show where to connect the chor/vib wiper!!

i will post the fix as soon as i figure it out.
the problem is with the chorus/vibe switch, as shown on the original vero and my copy, it's wrong. it's CLOSE, but the switch terminal connections are listed long.

i've just about got it sussed tho. i've learned enough i think in the last year, i can get it working better than it was and hopefully solve the noise issue i had which i believe to be a combo of poor wiring technique, and not having big enough current limiting resistors on the led's ... i think that's where most of the noise was coming from.

stay tuned...

Not sure exactly what you mean here, I can't see an issue? Everything seems to have a connection.

One thing I was never happy with on this one was the depth control though, seemed to have a few 'sweet spots' but not really work as a proper depth control, i'm not sure what FET you used either but I think the 2N5458 might not be the best substitute, I found one a lot closer, have to try and remember the code though... although even with a 2N4302 it doesn't work in a traditional sense.

Nice chorus regardless, although i've never tried it with the same audio path, just LFO/Clock set up.

iq01221 · March 26, 2013, 01:28:38 AM

Is there a pcb/perfboard version of it?
Jim: it's really a keeler sounding pedal!!

cathexis · March 26, 2013, 04:12:16 AM

Quote from: pinkjimiphoton on March 25, 2013, 11:47:46 PM
the problem is with the chorus/vibe switch, as shown on the original vero and my copy, it's wrong

Oh, I see it. This needs to be fixed! Maybe I'll even get around to boxing this great pedal while I have it out. Good catch Jimi!!
LARS

pinkjimiphoton · March 26, 2013, 12:21:47 PM

yah, it was weird... i've been thinking of re-visiting this for a while, and noticed the chor/vibe pot was losing most of it's volume at one setting, all the way up in one of the modes.. so i went thru and re-vistited a little last nite, swapped all the opamps out for tl082'.. got it VERY quiet.. but then noticed it was noisy as hell as soon as i tried to box it.

so i looked at the vero, cuz i thought the switch looked weird, and realized i had it wired wrong somehow.. so started comparing the vero to the schem.
where it says "to chorvibe 1 and sw1a pole" i realized it was wrong.. that should be different... i'm thinking the "pole" is the common pin, right, that connects to either a or b?

i had it right at one point, but i screwed something up when a wire broke off, and it hasn't been right since.

gonna replace the 2k current resistors on the led's with probably 20 k, they are more than bright enough, and that should help with some of the noise i hope.

there's a pcb layout on the net, that i believe is verified. tackling this on vero is a challenge, but a cool one!!

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MN3007 version eh clone theory...