[EFM] What EFM designs can be run from +9 volt supply?

[danial stocks]

>With more simple circuits modifying the original circuit makes sense, but
>with some others it might actually be easier just to use a charge pump
>method to gain a negative rail and a new ground reference and not have to
>worry about the circuit acting strange.
>
One thing to note abt charge pmp ccts.. the early ICL7660/1/2 ran on 5 - 10 
Khz clock.. this induces a bit of noise on the audio line and it's nearly 
impossible to get rid of.. These can be externally overclocked, or there are 
newer versions that run @ 30+ Khz which dont have this prob..
Cheers,
Dan
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