Alt-BEAM Archive
Message #04866
To: Richard Piotter richfile@rconnect.com
From: Don Papp donp@cronus.oanet.com
Date: Thu, 24 Jun 1999 10:36:44 -0600 (MDT)
Subject: [alt-beam] Re: PhotoDiodes
On Thu, 24 Jun 1999, Richard Piotter wrote:
> > >Photodiodes might be found in walkmans or disk drives (the sensor
> > >to detect write-protect or cassette loaded).. or are those more commonly
> > >phototransistors? Anyone?
>
> The chances of finding a photodiode or photo transistor in a walkman is
> almost nothing. They don't even HAVE write protect switches cause they
> DON'T record!!!
Right you are. My mistake.
> Standard tape recorders only use a simple mechanical switch for the tape protect.
Brought it up since a whole bunch of mini-cassette recorder guts I
have here all have a photodiode or phototransistor in the cassette loading
mechanism. Not sure why they don't use a mechanical switch, but whatever.
Might be worth a look if you have access to recorder guts.
| Donald Papp
| OA Internet Inc.
| don@oa.net
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