At 07:47 AM 21/08/2009, you wrote:
> > PWM is easy to do with 555s.
>
>
>You just need to remember that the ON time can't be less than the OFF time.
>
>Tony

It's quite easy to get wide range (eg. <1% to >99%) PWM at a fixed frequency
from a 555 using a pot (diode or active steering of charge/discharge
currents), but IMO not so easy to get voltage-driven PWM with a fixed period.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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