Alt-BEAM Archive
Message #06494
To: beam@sgiblab.sgi.com
From: Sean Rigter rigter@cafe.net
Date: Thu, 07 Oct 1999 17:24:08 -0700
Subject: [alt-beam] Re: circuit
Hi Ian,
Delusions of accuracy! All things considered, with fixed values you will be lucky
to get 1khz +/-50% but heck with the pot you can tune it to whatever.
grin
wilf
Ian Bernstein wrote:
> >hello, im looking for a high frequency (maybe 1khz) beam circuit that has an
> >output voltage of more then 5v, the wave form can be just about
> >anything...im
> >looking to drive a piezo buzzer if your wondering
> A bicore will work. Just use a 5K pot as the resister and set it to....
>
> T = RC
> so
> R = T/C
>
> .001 / .00000022 = 4.5K (4545.45454545)
>
> Thats half a cycle....
>
> 4.5K / 2 = 2.2K (2272.727273)
>
> So just hook up a multimeter to the pot and set the value to
> (2272.727273). The best thing is to use a ociliscope because the
> capacitors arn't exactly .22uF.
>
> Think I got that all right.
>
> Laterz
>
> --------
> There is only one true "SyNeT"
> BEAM Online - http://www.beam-online.com
>
> It IS as bad as you think, and they ARE out to get you.
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