Boss - DM-2 Delay  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

Boss - DM-2 Delay

Postby analogguru » 26 Jun 2007, 22:54

People like guts? ok, here are some others from our japanese hackerfriends (click on the pictures for high resolution):

Boss DM-2 guts

enjoy,
analogguru
Last edited by analogguru on 29 Jun 2007, 22:39, edited 1 time in total.
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
analogguru
Old Solderhand
 
Posts: 3286
Joined: 26 Jun 2007, 14:58
Has thanked: 0 time
Have thanks: 112 times

Postby bajaman » 27 Jun 2007, 13:33

Hi AG
I have heaps of ROLAND /BOSS schems from this era - let me know if you want any in particular
Steve
User avatar
bajaman
Old Solderhand
 
Posts: 4103
Joined: 26 Jun 2007, 22:18
Location: New Brighton, Christchurch, NZ
Has thanked: 346 times
Have thanks: 822 times

Boss - DM-2 ( Analog Delay )

Postby hgamal » 02 May 2008, 02:12

I looking for some internal photos from BOSS DM-2, mainly the copper circuit side.

Can anybody help me?
hgamal
 
Posts: 45
Joined: 19 Feb 2008, 19:06
Location: Brazil
Has thanked: 0 time
Have thanks: 6 times

Re: BOSS DM-2 Guts

Postby andre » 02 May 2008, 23:46

There's a good picture of the copperside here:
http://www.bossarea.com/

At this moment however, the website appears to be down.

If you're planning to clone the PCB, you can save yourself the trouble because
I recently succesfully cloned the DM-2.
Since my PCB is an almost exact copy of the original, I don't want to post it,
but I can mail it to you if you want to.

André
andre
Breadboard Brother
 
Posts: 50
Joined: 21 Jan 2008, 16:20
Location: Netherlands
Has thanked: 0 time
Have thanks: 6 times

Re: BOSS DM-2 Guts

Postby hgamal » 03 May 2008, 03:58

I have a board design already, but I want to see yours... Please send it to my e-mail: xxxxxxxxxxxxxxxxxxxxx
I have one doubt about MN 3005 operation. Its datasheet states the power supply voltage is something about -15 or -14 Volts (it is designed to be used with positive ground), but the DM-2 is designed to be operated using 9 V batteries. As in the service manual there is the word "selected" when it mention the MN 3005, I would like to know if can any MN3005 to be operated with only 9 volts? Does exist an special version of the MN 3005? (not the MN-3205 which is negative ground)

Did you use the DM-2 MN3005 circuit? or does yours use the MN3205 chip?

Is there any other opinions?
hgamal
 
Posts: 45
Joined: 19 Feb 2008, 19:06
Location: Brazil
Has thanked: 0 time
Have thanks: 6 times

Re: Boss - DM-2 ( Analog Delay )

Postby andre » 03 May 2008, 08:09

Haroldo,
I will sent my PCB design later today.
It's on another computer than the one I'm writing this reply on.

I can show you a picture of the parts side though:
Image

I did use an MN3005. This design would not work without it.
What they did is just reversing the MN3005 and MN3101's power connections and some other changes.

The MN3005's were "Selected" on minimal distortion at 9V.
I only tried 1 MN3005, and it sounds good to me, although I have a couple of them lying around.

André
andre
Breadboard Brother
 
Posts: 50
Joined: 21 Jan 2008, 16:20
Location: Netherlands
Has thanked: 0 time
Have thanks: 6 times

Re: Boss - DM-2 ( Analog Delay )

Postby kidblue » 24 May 2008, 13:19

Hello André

I'm planning to clone the DM-2.I found PCB on japanese website
http://wlst.jp/effector/dm-2/DM-2.pdf

website says some people reported that DM2 does not do a self-oscillation.

I'd love to build your version to save myself the trouble.

when you have a moment could you possibly send PCB to my e-mail:xxxxxxxxxxxx
sorry for my broken english.

kidblue
kidblue
 
Posts: 1
Joined: 24 May 2008, 11:40
Location: japan
Has thanked: 0 time
Have thanks: 0 time

Re: Boss - DM-2

Postby elfo106 » 01 Sep 2008, 02:07

maybe i try this one later

thanks
elfo106
 
Posts: 9
Joined: 07 Oct 2007, 01:03
Has thanked: 0 time
Have thanks: 0 time

Re:

Postby hgamal » 01 Sep 2008, 02:22

bajaman wrote:Hi AG
I have heaps of ROLAND /BOSS schems from this era - let me know if you want any in particular
Steve


do you have the DM-2 schematics/service manual using 3205?
hgamal
 
Posts: 45
Joined: 19 Feb 2008, 19:06
Location: Brazil
Has thanked: 0 time
Have thanks: 6 times

Re: Boss - DM-2 ( Analog Delay )

Postby miwanone » 16 Mar 2009, 10:24

I'd love to have this PCB! Could you email me at daanvanhasseltxxxxxxxxxxxxxx thanks a lot! :D
miwanone
 
Posts: 40
Joined: 07 Jan 2009, 01:23
Location: The Netherlands
Has thanked: 0 time
Have thanks: 5 times

Boss - DM-2 ( Analog Delay )

Postby TXEMA » 25 Oct 2010, 23:36

Hello
I would build a DM2.
Can any of you send me the PCB to txemasred@teeeees?
TXEMA
 
Posts: 1
Joined: 09 May 2010, 12:32
Has thanked: 0 time
Have thanks: 0 time

Re: Boss - DM-2 ( Analog Delay )

Postby tambey » 29 Oct 2010, 14:19

Please, me too. Send it to zulkifleo@
tambey
 
Posts: 11
Joined: 02 Feb 2009, 19:02
Has thanked: 0 time
Have thanks: 0 time

Re: Boss - DM-2 ( Analog Delay )

Postby guiteff » 30 Oct 2010, 20:20

Please, me too. Send it to guiteff@xxxxxxxxxx
guiteff
 
Posts: 2
Joined: 19 Jun 2009, 21:03
Has thanked: 0 time
Have thanks: 0 time

Re: Boss - DM-2 ( Analog Delay )

Postby MOSFETapocalypse » 31 Oct 2010, 08:54

http://revivalelectric.tumblr.com/post/1444826440/vintage-boss-dm-2-service-notes-schematic

Hi All,

I have a copy of the service manual, hope it helps!

Feel free to email me for a copy, travis@xxxxxxxxxxx
MOSFETapocalypse
 
Posts: 3
Joined: 01 Apr 2010, 04:32
Location: San Francisco
Has thanked: 0 time
Have thanks: 0 time

Re: Boss - DM-2 ( Analog Delay )

Postby Dirk_Hendrik » 31 Oct 2010, 12:40

Hold it,

With all blind horny requests for that layout by (mostly) first time posters,
Does thhat mean that in the near future there will be a whole new generation of DM builders which is finding out the MN3005 is a) impossible to obtain and b) all those chips seen in ebay adds happen to be fake?
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

For this message the author Dirk_Hendrik has received thanks:
modman (03 May 2015, 23:27)
User avatar
Dirk_Hendrik
Old Solderhand
 
Posts: 4131
Joined: 03 Jul 2007, 09:44
Location: Old Amsterdam
Has thanked: 247 times
Have thanks: 985 times

Re: Boss - DM-2 ( Analog Delay )

Postby jrc4558 » 12 Nov 2010, 16:27

can i possibly too have the pcb? thank you muchly!

jrc4558@xxxxxxxxxxxx
jrc4558
Solder Soldier
 
Posts: 171
Joined: 25 Aug 2007, 08:13
Location: Toronto, Canada
Has thanked: 1 time
Have thanks: 1 time

Re: Boss - DM-2 ( Analog Delay )  [schematic]

Postby modman » 16 Dec 2010, 14:03

I was almost going to say that DH spoiled all the fun, but dem deaf it seems...
To everybody in this thread:
Don't post your email on the forum!
"The whole point of diy is diy. It's not dsoiyathodtr - do some of it yourself and then have others do the rest" (paulc)
User avatar
modman
a d m i n
 
Posts: 4246
Joined: 19 Jun 2007, 17:57
Has thanked: 2887 times
Have thanks: 495 times

Re: Boss - DM-2 ( Analog Delay )

Postby harpplayer » 20 Dec 2011, 03:20

Hello!

I just built my DM-2 (actually, I am still waiting for the MN3005 and NE570 to arrive), and I am getting a slightly lower volume with the effect engaged (more like a small bass boost and treble/bright cut)

From the schematic, I don´t think the lack of IC´s in the delayed bit is responsible for it, since I am just cutting the connection between the direct signal and the effect per se input. I´ll probably have to mess with the capacitors around the opamp, but I am not sure which one.

I tried to lower the resistor (47k) just before the op amp´s second input, and I could even the bypassed and engaged volumes, but it is not quite right - it gets too mellow on the effect side.

Anyone have a clue on which cap should I mess with? I guess the input cap can remove some bass content, but it won´t help bringing back the bright freq´s.

Thanks very much!
André
harpplayer
 
Posts: 9
Joined: 17 Apr 2011, 19:35
Has thanked: 0 time
Have thanks: 0 time

Boss - DM-2 Delay - Calibration

Postby meursault42 » 18 May 2012, 22:24

I have a Boss DM-2 (MN3005 chip) that is in need of calibration. I have a copy of the calibration instructions as well as supplementary instructions from Boss expert Laurie Streitberg. All I need is someone with the willingness, the gear (sine wave generator and scope), and the savvy. I'd also like to avoid spending outrageous bench fees if at all possible ;)

Anyone want to take a crack at it or know someone who might? Drop me a line!

Thanks! :)
meursault42
 
Posts: 1
Joined: 18 May 2012, 22:18
Has thanked: 0 time
Have thanks: 0 time

Re: DM-2 Calibration

Postby Zokk » 19 May 2012, 01:46

Hi
why don't you go with software stuff like that:
http://www.sillanumsoft.org/

there are also many simple softs which can produce basic waveforms which can do their job quite well.

Cheers
Z.
User avatar
Zokk
Solder Soldier
 
Posts: 225
Joined: 05 Jul 2010, 21:00
Location: tantalum shortcut area
Has thanked: 142 times
Have thanks: 54 times

Next

Return to Modern Stompbox Effects (1975 - ...)

Who is online

Users browsing this forum: ballfire, InTelejens and 13 guests