[sdiy] ETI447

[harrybissell]

Might be a legacy from CD4009 (the chip the 4049 replaced) ???

H^) harry

Rönnberg Niklas wrote:

> Well, I understand that since pin 1 (Vdd) and pin 8 (Vss) are both
> connected to zero reference voltage. Pin 13 and pin 16 are not used
> according to the datasheet, but why is pin 16 connected to zero reference
> voltage in the ETI design (and pin 13 is not connected)?
>
> Maybe this is just some mistake in the original pcb layout and doesn't
> affect anything at all, and maybe not...
>
> Best regards
>
> /a rather confused Niklas
>
> -----Original Message-----
> From:   Ken Stone [mailto:sasami at hotkey.net.au]
> Sent:   Wed 7/7/2004 11:46 AM
> To:     Rönnberg Niklas
> Cc:     synth-diy at dropmix.xs4all.nl
> Subject:        Re: [sdiy] ETI447
> >
> >I have some questions about this circuit. I think that the use of IC9, a
> >4049 CMOS, are quite smart, but why are pin 16 connected to zero reference
> >voltage?
>
> because the chip is not being used as a digital chip. It is being used as a
> row of FETs. (a case of using it in a way it was not designed to be used)
>
> Ken
> _______________________________________________________________________
> Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
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