> -----Original Message-----
> From: Timothy Box [SMTP:Tim@TJBSYSTEMS.COM]
> Sent: Wednesday, February 12, 2003 3:53 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: Rounding the square wave
>
> Hi all
>
> I need to be able to round off the square wave coming from the HWPM on my
> PIC. The HPWM output is being used to generate sound. I am currently using
> the standard 2 Rs + 2 caps which works in a fashion but is still rather
> harsh. The freq range is potentionaly from 247 hz up to 12.5 kHz so an
> active filter is needed (I think). Can any body point me in the right
> direction?
>
Is this the frequency range of the signal you are sending on top of the PWM?
What is the PWM frequency?

Mike

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