On Sep 22, 2008, at 6:17 PM, Jinx wrote:

> if it helps, the circuit attached is stable, to about 2%, over the  
> Vcc range of the IC, say 3V to 15V.

Certainly not ALL "astable multivibrators" are voltage-independent.   
For instance, the internally generated clock on an Atmel ATtiny11 is  
quite dramatically (and IIRC rather linearly) dependent on supply  
voltage.

BillW


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