A "Reissue" Of The Analog Devices SSM2166P

[smallbearelec]

I am happy to be able to offer these:

http://www.smallbearelec.com/Detail.bok?no=234

The SOIC parts are current production bought through a franchised source, and I had Aries do the bonding, so I am confident of quality.

I have already spoken with Jack Orman, and he says that he is working on a redesign of his popular compressor, probably to be available in late autumn.

Maybe time to put the squeeeeze into some projects?

Regards
SD

[head_spaz]

The SOIC parts are current production bought through a franchised source, and I had Aries do the bonding, so I am confident of quality.

Are you implying that you've had the SOICs mounted onto DIP adapters???
Or do you mean that Aries put the dies in plastic for you???
Pre-mounted DIPs would be useful, especially for the old and half-blind codgers like me.

I've always heard good things about AD's compressor chips, but they've been hard to source since they stopped production. Good on AD for bringing them back! (I bet that franchiser had to buy a bunch of them, eh?)

[smallbearelec]

The SOIC parts are current production bought through a franchised source, and I had Aries do the bonding, so I am confident of quality.

Are you implying that you've had the SOICs mounted onto DIP adapters???

That is what I did, yes.

I've always heard good things about AD's compressor chips, but they've been hard to source since they stopped production. Good on AD for bringing them back!

A lot of of parts that would be useful for DIY are still made, but only in SOIC. I knew that this one had been popular enough that investing money would make sense.

(I bet that franchiser had to buy a bunch of them, eh?)

They didn't...I did

[Mike Burgundy]

Brilliant Steve!
Now I'm curious what Jack's coming up with. The only gripe I have with the QD2 is that it's slightly temperature sensitive. Great versatile comp, closer to having a studio rack comp on my bass than a stompbox, IMHO.

[chi_boy]

I know this is old, but since this chip was the subject of the SSM2166 Compressor, I thought I would ask. 

The Q&D compressor, as posted at Muzique (http://www.muzique.com/ssm2166.htm) has been the subject of more than a few topics here, and many of those topics have suggested improvements to the design.  I have not seen one, but has anyone ever posted a summary schematic that included all of the best mods as determined by the forum?  I tried putting together one myself so I could do a layout, but I don't know if I have all of the best ideas collected.  Just curious if anyone and the best ideas figured out yet.

Thanks,
George

[Mark Hammer]

The chip is so self-contained and complete, that there aren't all that many things to do, beyond the following:

1) It is designed under the presumption that it is receiving a low-impedance voice mic signal, not a high-impedance guitar signal.  So, it needs some kind of input buffer, and doesn't really need all the gain.

2) It has a lot of features that can be tapped.  Not everybody wishes to tinker with the downward expansion parameters, but they are available for tinkering.

3) The range of any parameter may or may not be one that suits you.  You may wish to play with the appropriate resistance values.

4) A better output stage, with a volume control, is helpful.

[chi_boy]

Thanks Mark.  I've read more than a few of your posts about this compressor, and you have made several suggestions to people to optimize the chip for pedal usage.  I wasn't looking for info on tweaking or modding, but rather was looking for a schematic that included all of the good, basic improvements that were intended to make the pedal usable.  Like the input buffer and output pot and such.  Matt Armstrong posted his modified SSM2166 compressor that included most suggestion, but there was also a thread about removing R1, R2 and C2 from the original schematic to reduce the gain.

I tried making my own schematic that included the "improvements" I found, but just wanted to know if someone else had already done that and posted.  Since Steve (Smallbear)started this post about the chip, I thought this might be a nice place to ask.

This is the schematic I came up with that is supposed to be a collection of everyone else's suggestions.  None of this is my own work.  Actually I thing most, if not all, is yours.

[Mark Hammer]

I suppose I'd look pretty foolish if I didn't say "Looks pretty good to me".
   

[DavenPaget]

You sure spent a substantial amount to get hold of 4 reels .