[sdiy] ElectroNotes substitutions

[Metrophage]

Hi Alfred - 

PNP substitutes for the AD821? For crucial applications these days
people tend to use either MAT03, SSM2220, or THAT320. For
not-as-crucial matching, maybe 2SA1349 or 2SA798.

If you're talking about "ENS-76 VCF Option 1" then the matched PNP pair
form a basic exponential converter. Bernie even says that if pitch
accuracy is not a concern, that two 2N3906s will do. I'd use a 2SA1349.

--- alfred.pear at gmail.com wrote:

> Hi -
> 
> I've been reviewing the ElectroNotes C.V. applications and wanted to
> ask people about what they substitute the AD821 matched transistors
> with. I'm specifically looking at the VCF Option 1, and it seems to
> serve the purpose of a buffer, so I'm thinking about just using an Op
> Amp instead... However, there are two separate terminal ouputs used
> that are directed to two different OTAs.
> Can I use a single op-amp ouput for the same effect?
> 
> Perhaps more efficiently: Does anyone know of any modernized versions
> of these schematics, with more readily available materials?
> 
> Thanks,
> Alfred
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