THAT VCA question

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THAT VCA question

Post by gtxdude » Wed Feb 29, 2012 8:37 pm


Can a THAT 2181 VCA be substituted for a 2180? I have looked at the data sheets. Aside from the fact that the 2180 is described as being "pre trimmed" and the 2181 is described as being "trimmable" i can find very little difference between them.

It's to close to call with my limited knowledge of the product so I seek your advice.

I'm building a ADSR/VCA.

Thanks a bunch!
Last edited by gtxdude on Wed Feb 29, 2012 9:17 pm, edited 2 times in total.
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Post by Mongo1 » Wed Feb 29, 2012 8:55 pm

Yes -
As far as I know, the only difference is that with one of them you can add an external 'trim' pot.

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Re: THAT VCA question

Post by Synthbuilder » Thu Mar 01, 2012 2:22 am

gtxdude wrote:Can a THAT 2181 VCA be substituted for a 2180?
No. Although the reverse is probably true.

You need a trimmed part in the ADSR core. So you either do it with a 2180 and no trimming or a 2181 and trimming. No trimmers are provided on the board so unless you feel like adding a trimmer and a resistor or two, I'd stick with the 2180.


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