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

[Tom Wiltshire]

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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