New SSI2144 Filter Chip Now Available In Small Quantities

DSP Synthesizers has announced that it now has the Sound Semiconductor SSI2144 chip available in single units or small quantities. 

The chip is a reissue of the classic SSM2044 filter chip for synthesizers, and was developed by its original designer, Dave Rossum.

The SSI2144 uses the same internal circuit as the SSM2044 but in a SSOP-16 package. There is also an adapter PCB for converting it to a DIP-16 SSM2044 replacement to upgrade or repair vintage synthesizers.

The SSI2144 is priced at US $6 and the adapter at $4.

13 thoughts on “New SSI2144 Filter Chip Now Available In Small Quantities

  1. Why does anyone still talk about, or buy, this guy’s stuff? Everything he “puts out” is stolen from ideas other people have pr success with a few weeks before. He’s ripped off a lot of people in the past, he’s banned from many forums, and his history with selling these types of chips is pretty sketchy too. There are two manufacturers he still owes thousands of dollars to. Of course he’s going to reply here and threaten me, just like he does anyone who criticizes him.

    1. I’ve never seen any of Jan’s designs that were stolen as you claim. His designs are original, interesting, and open source. He is a net contributor. This is the first I’ve heard he owes people thousands of dollars. Please provide proof of all your claims, with citations to reliable sources. It seems every time one of his products are announced you post attacks on the guy and your claims about his criminality or immorality and what not get more extravagant every time, never with any proof or citations of any kind given.

  2. I think his reputation is very well known, dude. Think for a second: why are Synthtopia and Matrixsynth the only websites that repost his press releases? When I say “steal” i am referring to how Behringer announced chips, then Jan; Division 6 offers a card sequencer, then a month later, jan does too. He seems to do stuff as a reaction to whatever else is successful (and not open source) and tries to make a quick buck, then when it’s time to deliver, he disappears. What is a “net contributor” and who cares if it’s open source if it doesn’t even work. Ask people who donated to his three(!) failed crowdfunding projects this winter, he told everyone he had cancer… Yet now he’s back with more derivative “products”. Every single claim Ive ever made has been mentioned on reddit, as well as the MW GS and MI forums. His games are well documented. Look for yourself.

    1. You seem confused about many things.

      > “When I say “steal” i am referring to how Behringer announced chips, then Jan.”

      Behringer acquired chipmaker Coolaudio who reproduce the Curtis CEM 3340 VCO and CEM 3320 VCF. They say these are identical to the originals. Both have IP that is out of patent so this is legal to copy. A new run of the CEM 3340 is also being made by Curtis Electromusic, which is run by the original designer Curtis’ widow. She is unhappy about the Behringer development.

      Jan is selling in single units the SSI2144 VCF chip designed and manufactured by Dave Rossum. Dave Rossum is the original designer of the classic SSM2044 VCF. He upgraded, improved and redesigned the original and released it in a smaller surface mount package. These are only available from his company in large quantities. Jan purchased a large quantity of these and is offering to sell individual chips to people interested in small quantities, such as for an upgrade to an old synth, or a new one-off design with true analog filters. This is stated clearly. There is nothing wrong with any of this. The CEM and SSM/SSI chips are from totally different designers and companies. They are not related. The Behringer CEM chips are not related to the SSI/SSM chips other than being chips for musical instruments. Making analog chips like this has a very long design and production cycle, a minimum of a year. No one can hear about an analog chip and then design fabricate and release a new one in a few weeks. The delay is at least a year and the cost runs in the hundreds of thousands to millions of dollars depending on how many revisions need to be done. These tooling and development costs and the expected final production quantities greatly affect the costs of the chips and the timeline.

      > “Division 6 offers a card sequencer, then a month later, jan does too. ”

      Business card sized circuits are nothing new. I was giving away business card sized circuits with my contact information over twenty years ago. Those boards had custom VLSI DSP processors that I designed which cost millions to develop and were eventually used in countless devices, perhaps even some you own. They were pretty cool. That was a long time ago and it’s been decades since I did so. If anything everyone here is ripping me off. But do I go around saying that. No of course not because their designs have nothing to do with mine other than being small circuit boards, which are not some fantastic unique invention that no one has ever thought of before.

      Division 6’s sequencer card, which is very similar to many other small sequencers that have come out recently, was debuted in late September 2016. Jan has not released a sequencer other than perhaps his drum machine, but in December 2016 he did announce and demo his Tiny-TS synthesizer, which is the latest evolutionary step in a sequence of small synthesizers he has been releasing for several years . His synthesizer does not have a step sequencer or a arpeggiator. It appears you watched his youtube video where he showed that an external sequencer could play his Tiny-TS using its CV and gate connectors and you didn’t pay any attention and concluded somehow that his synthesizer was a sequencer. Even if it was a sequencer or included one though it would not be a rip off as you are claiming of Division 6’s sequencer. Division 6’s sequencer is hardly unique. There are dozens of sequencers out right now with the same ideas, and generally similar designs have been since the 1960s.

      You are making these horrible accusations and claims and you do not even have the most basic comprehension of the technology. You owe him an apology. And you should stop posting absolute nonsense on the internet that is based on easily verifiable falsehoods. It is a very foolish and damaging practice to do so.

      I’ve tried in the past finding the threads you claim exist on various discussion boards and have not found them, despite wasting much time on the search. Your lack of links is most telling. I’ve found people arguing with him, complaining about the lack of antialiasing in one of his designs, complaining about late shipments but which eventually did arrive. I have not found evidence he owes thousands of dollars to manufacturers. Maybe he does. If he does you should have taken the chance I offered and posted links with your evidence rather than state complete nonsense that is provably false.

      1. The manufacturer is well known and has already talked about it when Jan was under fire for copying Roland logos. Jan threatens to sue everyone who calls him out! Including myself! You’re not looking very hard, I typed “janost” into muffwigger and found literally five threads discussing just this. Doing a Google search of his name shows several arguments on the MI forum with Oliver himself. Obviously there are a few of people who benefit personally from Jan and they have a personal interest in his success. You’re one of his DIY buddies- so no surprise you continue to back him up multiple places online.

  3. Interesting, I got an Emu Sp1200, which uses 2044.
    Will my sound char change if I replace my original 2044 with these and does this give me new control options?

    1. According to Rossum’s datasheet available at his site, the improvements are as follows: “The SSI2144 will operate on supplies as low as ±4V, and improvements include lower noise, significantly better control feedthrough, and more consistent unit-to-unit performance of the resonance control.” It also states “Most importantly, the SSI2144 preserves the coveted sonic character of the SSM2044.”

      Most likely the one you’ll notice is lower noise. According to Rossum’s datasheet the character will be the same.

  4. Can you fit it in a Monopoly.
    I mean i dont know anything about electronics but the old chips and the new ones do not look the same. Can someone tell me please.

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