Boss DM-2 project... has anyone built it?

[GonzoFonts]

Has any one built the Boss DM-2 project? If so, please tell us how it turned out.

The link to the project PDF file is here.

The original post on the forum is here.

Thanks in advance.

GF

[nero]

I never made it, but I found another layout. I hope it can be helpfull

http://s121.photobucket.com/albums/o201/stratotrasto/?start=all

[reverofratiug]

I built it. Sounds great to me, although i´ve never had an original Boss DM-2 to compare.
I made a little sample to show how it sounds, especially the self-oscillation mode.
Does anyone that has an original DM-2 could tell me if the self-oscillation is really like that on this sample?

http://www.handmades.com.br/components/com_joomlaboard/uploaded/files/Teste_DM2.mp3

Thanks

[MartyMart]

Sounds VERY like the original to me !! ... nice work ( I don't have one anymore, needed the cash ! )
Marty.

[frokost]

I have a DM-2. The self oscillation sounds very good! If anything, I don't think mine distorts that early, but that could be because of component tolerance or whatever... And bad memory, since I don't use it that often anymore.

Great pedal.

[reverofratiug]

Thanks guys! I was thinking i did something wrong...
If anyone has some other sample please post it here, ok?

[GonzoFonts]

reverofratiug,

MANY THANKS for posting this.

I played a friends DM-2 a long time ago and from my recollection, I would say that your sounds VERY GOOD, maybe even better than an original.

Which layout did you use? Did you use the layout from the link I provided or the link that (forum member) nero provided.

Thanks again.

GF

[reverofratiug]

Well, Gonzo... Actually i used neither of these layouts. I re-designed a new one by myself. But i did use the Wanderlust layout (you provided) as reference on my re-designing.
There´s something i have to say to you about it. I sent an email to the guys from http://wlst.jp questioning the same thing... Got a response from a guy (or girl, i dont know) called Maya.

Here´s my message to them:

Hi.
... I sucessfully built the DM-2 using the layout you guys provided, and it´s all functional. But, i have only one question. Is it normal all that noise when it is in self-oscillation? I´m asking that cause i never had one before to know if it is or isn´t normal. Mine, when on self-oscillation, starts to get more and more gain on the signal and then become so loud that i have to turn down the volume before it blows my ears...

Here´s the response:

"Hi.
Thanks for visit my site. My name is Maya.
>Is it normal all that noise when it is in self-oscillation?
No. My dm-2 becomes feedback gain same as your dm-2.Perhaps I think this schematics is feedback gain too big.However, I don't get chance that make the cause yet,because I don't need self-oscillation.Then, when I make the cause, I will remake the pdf. If you want to use dm-2 by self-oscillation, i'm sorry you haveto use original dm-2.
Thank you."

As you can see, i´m a little uncertain about all of this now.   
What do you think?

[DWBH]

Well, I have never played with a real analog delay pedal, but when I use my analog simulation in Gearbox ( ) and when it starts oscillating, it gets pretty darn loud. Most of the times I have to turn the volume down, or even turn the stompbox off, due to the exaggerated sound level it does.
So, I think it's normal.

[frokost]

I say it's normal. You control the volume of the self-oscillation with the echo knob, and it can get VERY loud. And cool  .

[MartyMart]

It's normal - Feedback is the signal gain op top of the same thing , over and over so constant increase .... BAM !!!
Watch those speakers and your ears !!
Same thing happens on my other delays with feebback and also sofware "tape delays" such as in Logic Audio.
MM.

[DWBH]

Where do you get those IC's (in Europe)?

[reverofratiug]

Yes Marty, I think you´re right. I thought the same thing about it.  Was just wondering if this circuit have some kind of filter to take care of this enourmous gain.

Well, i think i have a DM-2!!!

DWBH
I got the MN3005 on ebay and the MN3101 on a local store.

[Branimir]

My printer is malfunctioning, so I cannot print it and measure the pcb, how big is that board? Will it fit into the BB enclosure? I'm refering to the pdf in the Gonzo's first post.

[kugua]

i checked the schematics about DM2, have a problem about it,why 12 pin of NE570  does not connect a 10K resistance to the ground,because i test the circuit when i connect a 10K resistance to the ground the signal will be full wave,and expanded very much ,but when cut it but the signal will be half wave.and distortion.

[AM]

Mine, when on self-oscillation, starts to get more and more gain on the signal and then become so loud that i have to turn down the volume before it blows my ears..

It has been answered already by a couple of people but I'll add my 2 cents too. I had an analog delay (from which I happily parted some time ago and got three times more than what I payed for it) and it had the exact same behavior when oscillating. It wasn't the DM-2 but I don't think it matters. The volume increase is just part of the self-oscillation. I always had to cut mine out before it would first blow my ears and then move on to my speakers.

[Andre]

My printer is malfunctioning, so I cannot print it and measure the PCB, how big is that board? Will it fit into the BB enclosure? I'm refering to the pdf in the Gonzo's first post.

I'm not sure about the wanderlust DM-2 project PCB, but I recently cloned the original DM-2 PCB and it does fit into a BB enclosure.
Here's a picture:


It's not verified yet, as I am waiting for the enclosure pots and jacks, but with the help of Steve Daniels I hope to finish it this weekend.
I'm not sure if I can post the PCB drawing, since it's a rather exact copy of the original, but I can of course email it on demand.
To keep it as close as possible to the original I will also use the electronice bypass switching.

André

[ollie]

I have an original dm-2 so i'll record a couple of clips and post em here soon so you can compare


EDIT:

Here's a demo of it. You'll probably have to skip around a bit to hear the different kind of sounds you can get

http://www.fileden.com/files/2007/12/19/1653125/dm2demo.mp3

Also, I used it here on one of my bands demos, it's the only effect in use for the intro of this (other than distortion and a bit of reverb) and I used it in my favourite way - the 'chaos' kind of sound

http://www.fileden.com/files/2007/12/19/1653125/m91leech.mp3

[rasco22862]

any subs for the transistors 2SC732TM, uPC4558C?

Thanks

[Andre]

any subs for the transistors 2SC732TM, uPC4558C?

Thanks

For 2SC732 you could use almost any NPN transistor like BC549 or 2N5088,
or if you want pin compatible ones you could use 2SC1815's which you can buy from Smallbear.
For UPC4558C you could use any dual op amp.

André