> > Does anyone have a block diagram of the ( voltage ? )
> > reading-to-audio-tone electronics ?

> 2. Use CD4046 block diagram.
> Essentially as above with a few support components thrown in to set frequency per Volt etc.
>
> http://focus.ti.com/lit/ds/symlink/cd4046b.pdf

This may work better.
The other tends to crash on loading.
May just not like being readf uiopside down.

    http://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/CD4046BC.pdf



R
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