[sdiy] THAT2162 vs SSM2164 (was Re: (re-)introduction)

[Tom Wiltshire]

I guess the serious question is "Why isn't there a V3280?".

That might make a few people happy!

On 27 Nov 2013, at 18:49, Tom Wiltshire <tom at electricdruid.net> wrote:

> Yep, there's still the Coolaudio V2164 in DIP, so it isn't over yet, and yes, it only inverts if you include the I-to-V stage after it!
> 
> It was only the Analog Devices original "SSM" branded version that disappeared.
> 
> I notice CoolAudio have started doing a V2162 as well. So they've got it all covered - 2164, 2162, 13700, BBDs, the lot.
> 
> T.
> 
> On 27 Nov 2013, at 18:36, Jack Jackson <jackdamery at hotmail.co.uk> wrote:
> 
>> http://www.mammothelectronics.com/Coolaudio-V2164D-Quad-Voltage-Controlled-Amplifier-p/400-1034.htm
>> 
>> And isn't the 2164 still made in DIP from Cool Audio? They have them here ^
>> ----------------------------------------
>>> From: dixon at mail.ubc.ca
>>> To: tom at electricdruid.net; wackyvorlon at me.com
>>> Date: Wed, 27 Nov 2013 10:13:46 -0800
>>> CC: aym-htnys at teaser.fr; synth-diy at dropmix.xs4all.nl
>>> Subject: Re: [sdiy] THAT2162 vs SSM2164 (was Re: (re-)introduction)
>>> 
>>>> 2) THAT2162 is non-inverting. There are a number of occasions
>>>> where the inverting nature of the 2164 is very helpful.
>>>> Olivier Gillet's "Four Pole Mission" Xpander-style filter is
>>>> a good example:
>>>> 
>>>> http://mutable-instruments.net/shruthi1/build/4pm
>>>> 
>>>> This design wouldn't be half so neat without the inverting
>>>> SSM2164 stages. In fact, it'd be nearly as messy as the
>>>> original Xpander filter, which was covered in inverters for
>>>> exactly this reason.
>>> 
>>> The 2164 is a current amplifier. It does not invert the current. Positive
>>> current in gives positive current out, and negative current in gives
>>> negative current out. However, the 2164 must terminate at virtual ground,
>>> so the following I-V converter is always necessarily going to be an
>>> inverter. In that sense the 2164 inverts.
>>> 
>>>> The rest of the differences are mostly fairly minor in my
>>>> view - variations in spec (as you say, THAT is more hifi) and
>>>> value tweaks. If I ever actually make the jump to SMD, I can
>>>> see this THAT chip going right up my list.
>>> 
>>> 2164 is also available in SMD, from Coolaudio.
>>> 
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