[sdiy] Top Octave Generator (was Chinese MG-1s??!?)

[Roy J. Tellason]

On Thursday 01 May 2008 21:04, Paul Perry wrote:
> That would be a product of the type of chip used, not inherent to the
> process itself, surely?

I'm thinking of all that background noise I used to hear in some of those 
organs I worked on....

> In any case, if you just had 12 schmits after the outputs, that would get
> any hash off the outputs.

It's not at the outputs,  but all that stuff going on being picked up 
elsewhere,  particularly in any lower-level circuitry that's the problem.

> Using the output from a digital chip directly as an analog signal is asking
> for trouble.
>
> paul perry Melbourne Australia
>
> -----Original Message-----
> Another really nasty thing about the TOG + divider approach is that there
> is unwanted signal coupling  from all the oscillators and dividers running
> continuously, sometimes a noise gate is used to shut off the output to hide
> this. Adding the ability to mute outputs that aren't currently in use would
> be a good idea, or even just a simple global "mute all" signal.
>
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