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kazper
SpUser
Joined: 10 Aug 2008
Posts: 16
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| Wanted: Hi Res pictures of the Discrete SSM2044 |
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Hello gents,
Working on a reverse engineering project and was wondering of one of you guys with a last run Sp-1200 could help me out with it till I source one myself. I'm looking for pictures, High resolutions of the PCB bottom, PCB Top, and components and there numbers/colors so I can reverse the SSM2044 circuit in the last run.
Without seeing a PCB shot I'm thinking it's going to be a cluster of oP amps, diodes, resistors and caps near the outputs on Channel #1 and 2, the filtered channels. It would distinguish itself from a single SSM2044 on some of the other pictures floating around here.
Thanks,
Kaz |
Sun Aug 17, 2008 11:44 am |
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rokuez
SpUser
Joined: 28 Feb 2006
Posts: 103
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email the fellow over at www.emulatorarchive.com he would be the most likely person to help you i think
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Thu Aug 28, 2008 7:42 pm |
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Triggerhappy
SpUser
Joined: 21 Jul 2008
Posts: 15
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How can you revrse engineer these chips without looking "into" one with an x-ray?
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Sun Sep 07, 2008 5:21 pm |
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RHYTHM MONSTER
SpUser
Joined: 22 Feb 2007
Posts: 290
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| essence wrote: | As far as I'm informed, there are actually 3 different SP types :
1. Original grey edition
2. The re-issue with the new black & grey design
3. The second re-issue without the famous SSM2044 filters but with OP-AMPS which emulate these
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Sun Sep 07, 2008 10:18 pm |
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kazper
SpUser
Joined: 10 Aug 2008
Posts: 16
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Exactly... IE I'm looking for the last run PCB shots.. |
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Sat Sep 13, 2008 4:36 pm |
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thx
SpUser
Joined: 17 Nov 2008
Posts: 118
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| ssm2044 (9145) chip photo |
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from the inside of the sp1200 first reissue (black 7030 model)
SSM2044
9145
top
i have 1 question:
why there are two ssm2044 chips?
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Sun Oct 04, 2009 7:02 am |
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kb
SpUser
Joined: 18 Jun 2007
Posts: 29
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| dang - I was hoping this was something else! |
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I was hoping this was a project to x-ray the IC to look at the actual internal 2044 layout! The 2044 is different that all other filter IC chips that I've seen, because it connects the capacitors _between_ IC pins, not to ground.
Connecting them this way suggests that the filter topology is more like the Moog filter than the typical OTA filter. Been a lot of discussion about that on the SynthDIY and AnalogHeaven lists, but I haven't seen anybody dive down into the actual chip to verify that the topology IS Moog-like.
I think what you want is the circuit layout around the chip? You can look at the datasheet for the 2044:
http://www.synthtech.com/cem/ssm2044.pdf
or email these guys:
http://www.electricdruid.net/index.php?page=info.ssm2044
http://electro-music.com/forum/topic-15933.html&highlight=
or look at the sp1200 service manual to figure out what they did (sorry I don't have that link).
Good luck! |
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Sun Oct 04, 2009 10:35 am |
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12BIT
SpUser
Joined: 02 Feb 2007
Posts: 57
Location: australia |
QUESTION?
my sp1200 has these ssm2044 chip's:
ssm2044
8547
&
ssm2044
8336
one of each
unlike the ssm chip's pictured above in THX's post (two of the same with 9145)
*do these numbers mean much??
any idea's
thanks in advance
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Wed Oct 07, 2009 5:49 am |
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Drinks
SpUser
Joined: 12 Jul 2007
Posts: 234
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I would imagine that's the production batch number.
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Wed Oct 07, 2009 6:53 am |
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