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[b]VCCS for 558 one shot[/b]? PLS Help!

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LeftRights

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I need a way to control the pulse width of a 558 one shot using voltage. At first I thought I could use a voltage controled resistor, but everyone has suggested using a voltage controled current source instead of a RC circut.

I know nothing about voltage controled current sources. Can anyone help? Any good websites for reading up on these? Can anyone recomend any schematics?

Thanks for any help. If I can get this a long term project will be done. :D
 
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