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kazper SpUser
Joined: 10 Aug 2008
Posts: 16
Wanted: Hi Res pictures of the Discrete SSM2044
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
rokuez SpUser
Joined: 28 Feb 2006
Posts: 103
email the fellow over at www.emulatorarchive.com he would be the most likely person to help you i think _________________ E-mu Emulator Sampler Series Forum
EIII EII EI & EIIIXP
How can you revrse engineer these chips without looking "into" one with an x-ray? _________________ [no sig for now]
Sun Sep 07, 2008 5:21 pm
RHYTHM MONSTER SpUser
Joined: 22 Feb 2007
Posts: 290
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
Sun Sep 07, 2008 10:18 pm
kazper SpUser
Joined: 10 Aug 2008
Posts: 16
Exactly... IE I'm looking for the last run PCB shots..
Sat Sep 13, 2008 4:36 pm
thx SpUser
Joined: 17 Nov 2008
Posts: 118
ssm2044 (9145) chip photo
from the inside of the sp1200 first reissue (black 7030 model)
SSM2044
9145
top
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:
