[sdiy] tony clark's 8 step envelope

Ingo Debus debus at cityweb.de
Wed Apr 14 18:38:00 CEST 2004


Am Montag, 12.04.04 um 20:44 Uhr schrieb Tony Clark:

>    One good thing is that as 74xx stuff starts getting obsoleted, it 
> will
> be the higher voltage parts.  Swap in lower voltage equivilants and a
> new regulator and you're pretty much done.  If CD4K gets obsoleted,
> there IS no substitute, lower voltage or no.
>    Also, one other major factor in using TTL over CMOS is interfacing 
> the
> logic levels.  I don't like CMOS logic levels as those aren't very
> "synth" friendly.  Most synths don't put out gates high enough to 
> switch
> +15V CMOS (11V per spec sheet), and some put out only 5V gates.  So TTL
> logic levels assures compatibility with pretty much everything out
> there.
>

So if power consumption is a problem with 74xx, why don't you use 
74HCxx or 74HCTxx?

Is this a stupid question?

Ingo



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