[sdiy] Help, I'm Desperate! (Charge Injection with DG408)

Erik Dower electronicpresskit at gmail.com
Wed Dec 12 15:47:42 CET 2018


FWIW, the quad panner I made for the Poltergeist uses separate vcas for each output, and DG444 with LM339 to switch the control circuitry between them. As others have mentioned, the switching occurs when the vcas are totally off so clicks are not heard.

epk

> On Dec 12, 2018, at 3:53 AM, David G Dixon <dixon at mail.ubc.ca> wrote:
> 
> Roman,
>  
> You're right.  Your suggestion is superior.  I was simply unaware of what a complete shit-show all this digital circuitry is.  This is exactly the reason why I avoid digital solutions whenever possible.  This module should be a pretty straightforward application of an analog multiplexer, but you are basically saying (and I concur based on my experience) that I can't use such a thing for clean audio, and to me, that is a sad indictment of these ICs.  I'm now switching these DG408s about as cleanly as is humanly possible, and they're still misbehaving.  It just shouldn't be this hard.
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