Wanted: Hi Res pictures of the Discrete SSM2044

kazper · 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

rokuez

email the fellow over at www.emulatorarchive.com he would be the most likely person to help you i think

Triggerhappy

How can you revrse engineer these chips without looking "into" one with an x-ray?

RHYTHM MONSTER

kazper

Exactly... IE I'm looking for the last run PCB shots..

thx · ssm2044 (9145) chip photo

from the inside of the sp1200 first reissue (black 7030 model)
SSM2044
9145
top

i have 1 question:
why there are two ssm2044 chips?

kb · dang - I was hoping this was something else!

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!

thx

thanks for the infos

12BIT

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

Drinks

I would imagine that's the production batch number.

Wanted: Hi Res pictures of the Discrete SSM2044

ssm2044 (9145) chip photo

dang - I was hoping this was something else!