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Goran
Double Platinum Member
Sweden
2203 Posts |
 Posted - 07/04/2005 : 08:20:15
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I�ve read or heard somewhere that two different chips (bucket brigade) were used in DM-2, is this true?
And does this in any way make differences in sound or anything else?
How does one identify them?
I�ve also heard/read that the late DM-2�s are hard to get the amazing occilation from, can this have something to do with the different chips? |
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dm-2
Bronze Member
Ireland
81 Posts |
Posted - 07/04/2005 : 18:48:15
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| I have a DM-2 but I have no idea if it's an early or late model. It's got a black label and I think the screws are metal. If you tell me the setting for "the amazing occilation", I'll have a go and let you know how I get on! |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 07/04/2005 : 19:48:13
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Haven't heard about this but it's possible.
Here's data for mine:
BBD: MN3205
Serial number: 232300
PCB: ET-5214-510A |
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Goran
Double Platinum Member
Sweden
2203 Posts |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 07/05/2005 : 07:32:10
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I�m pretty sure it was in this interview with Analog Man that I found the discussion of the two different bbd-chips:
http://www.tonequest.com/articles/article21.htm
It�s long but as I remember very interesting, not just about Tube Screamers. |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 07/05/2005 : 10:35:53
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| Couldn't find anything about different BBDs in DM-2s there but it's an interesting interview. Thanks for the link. |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 07/05/2005 : 10:54:43
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Well, I have to check all my papers at home, but I�m pretty sure it was something said by Analog Man.
Sorry about that.... but it�a anyway a very interesting article. |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 07/06/2005 : 06:57:58
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Well, I forgot the paper with the number of the BBD chips.... remember tomorrow...
BUT I found the source of the 2 different BBD�s, it was on Analog Man�s  FAQ, and I cite:
You can't even say that all Japanese boss pedals are the same, there are always running changes. For example, the DM-2 delay used two different types of BBD chips so two DM-2 pedals (all made in Japan) will sound different because they are different circuits.
This is a very, very interesting FAQ, read it at:
http://www.analogman.com/faq.htm |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 07/07/2005 : 06:56:36
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Here you have the data for my DM-2;
Serial: 358500
PCB: ET5212-510B
BBD: MN3102 or MN3205 (I�m not sure if one or both are BBD�s, both of the numbers are in my DM-2 on two different chips).
If I look at boss area�s BBD it is the same (one of them at least...)
Anyone more have data for their DM-2???
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 07/07/2005 : 09:23:56
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| I think 3102 is the clock driver for the BBD. They're usually used together (mine has one of those too). |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 07/07/2005 : 10:18:53
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Somebody else that have DM-2 and can check what BBD??
Then maybe we could verify Analog Man�s statement. |
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dm-2
Bronze Member
Ireland
81 Posts |
Posted - 07/07/2005 : 11:48:16
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| I'll check mine out tonight but I've never opened a pedal before, is there anything I should/shouldn't do? |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 07/07/2005 : 11:55:48
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There's nothing serious to worry about.
Just be careful not to pull to hard on anything and make sure you remember to replace the plastic sheet between the PCB and bottom plate when you put it back together again. |
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stinkfoot
Silver Member
Sweden
181 Posts |
Posted - 07/13/2005 : 03:12:40
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The MN3102 is indeed the clock driver, and is used in conjunction with the BBD delay chip. Apparently, there were two versions of the DM-2, using different BBD chips. The DM-2 was originally designed and produced using a 4096 stage MN3005. Somewhere down the line, they went to an MN3205 instead, which is a low-voltage version of the MN3005. There is a small difference in how the two chips are hooked up to the circuit (the MN3205 has pin 1 hooked up straight to ground, whereas the MN3005 has pin 1 hooked up to a reference voltage), but the rest of the circuit is exactly the same. The later circuit using the MN3205 was given the "A" designation (i.e. ET5214-510A instead of ET5214-510).
/Andreas |
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bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 07/13/2005 : 10:01:05
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| Thanks Andreas, great info. |
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dm-2
Bronze Member
Ireland
81 Posts |
Posted - 07/27/2005 : 15:55:22
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Sorry for delay in reply everybody, I've been away from my equipment for the last few weeks. Anyway, I cracked open my DM-2 just there. Here are the details:
BBD: MN 3005
Serial: 094000
PCB: ET5214-510
To confirm to Goran, yes I can get the amazing occilation, pretty much exactly as is on the BOSS CD from The Boss Book. Also, my DM-2 is not silver screw as originally stated, I have learned much from my Boss Book! |
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Topic |
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DM-2, different chips?
