Michael Rigby-Jones email (remove spam text)
> -----Original Message-----
> From: James Burkart [SMTP:PACBELL.NET] grafxjkb
> Sent: Wednesday, December 27, 2000 8:38 AM
> To: MITVMA.MIT.EDUPICLIST
> Subject: Re: [OT] Sound Detector
> Well, If you use something like a super-bright blue or white LED the
> spectrum they emit is very narrow, no IR. But I really don't think that
> are bright enough.
Surely a white LED, by definition, does not have a narrow specturm?
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