SSM2164

[jorgen.bergfors at idg.se]

>> Excuse me if this has been discussed before. I'm new to this list.
>> Has anybody tried the SSM 2164? It is supposed to replace the SSM 2024, but
my 
>> electronics supplier (www.elfa.se) only stock the SSM 2024. Both are quad 
>> current controlled amps. They are almost pin compatible. Some minor changes 
>> have to be made to the circuits. The datasheet (on the Analog Devices
website) 
>> explains what should be done.
>> To me the SSM 2024 seems good enough, but if it will be replaced eventually,
it 
>> might be better to use the newer chip. Any thoughts on this?
>> 
>If you're looking for a vca, take a SSM2018/2218. It has exponential
>control, exquisite control rejection, low noise and distortion. I think
>it is made for vca-mixing desk consoles. It offers differential input &
>output. I tryed it: superb. The only thing is that you don't have
>linear control.  Currently I'm thinking about a preprocessing circuit
>to achieve exp, linear and log control curves.  This should be possible
>with a diode-function-network, since high accuracy is not required.

>Farnell and RS and others have these parts on shelf.
>I know a little company in Germany that imports almost any Analog Devices
>Chip.
>Hope this helps.
>
>m.c.

Thank you for your quick reply.

I am thinking of using the SSM 2024 for less demanding tasks, like sticking 
them on the outputs of the VCOs and LFOs. That way I can voltage control the 
amplitude of everything. Because the VCF is generally patched after the VCOs, 
some noise would not be that critical. In any case I suspect the SSM 2024 is 
far better than a VCA built around a 3080. 
Because the 2018 is just one VCA per chip, I suspect it is more expensive. It 
will also be more chips to solder in, which means more work. I might use the 
2018 for a separate VCA-module though.
By the way, I can't find the SSM 2218 on Analog Devices' web site. There is a 
SSM 2118 though.

Could you post the addresses to the chip suppliers you mention? Are they on the 
web?

Once again, thanks for the information
Jorgen Bergfors