[sdiy] Speaking of CMOS....

[Happy Harry]

I'm understanding that the 4052 is run on +/- 8V and the
control signal is 0-11 volts ?  You could just use a series
current limiting resistor (maybe 100K) and let the protection
diodes clamp it... but it will have a 100K and maybe 5-15pF
lowpass filter built in...

Or you could tie the 4052 to reference the -8V...and use a
resistive divider to both pull the low level down more...and
attenuate the high level..

I'd use technique #1

H^) harry


>From: René Schmitz <uzs159 at uni-bonn.de>
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Speaking of CMOS....
>Date: Mon, 29 Apr 2002 15:06:59 +0200
>
>At 14:49 29.04.02 +0200, jorgen.bergfors at idg.se wrote:
> >
> >>Would it be wise for me to  pop a PNP in there instead to keep the 11
> >volts
> >>the hell away form the 4052, given thats 3 volts higher than it's Vdd?
> >
> >Buchla just put a 1M resistor in series with the signal and let the
> >built-in input protection diodes do their thing. Nasty, but works.
>
>If you want to do it right, interpose a 4050/4049 buffers/invertor its
>noted in the Datasheet that they can be driven from voltages higher than
>Vdd. Though I think a current limiting resistor is still neccessary.
>
>Cheers,
>  René
>--
>uzs159 at uni-bonn.de
>http://www.uni-bonn.de/~uzs159
>
>
>




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