Date: Thu, 28 Jun 2001 09:30:06 -0400

Author: Machele Bailey

Subject: [Fwd: Re: Large Digital Multimeter]

Post:

About a week ago, I asked Mike about making a large digit multimeter for
lecture demos. Here's one thought he had....

-------- Original Message --------
Subject: Re: Large Digital Multimeter
Date: Wed, 27 Jun 2001 22:25:46 +0100
From: Mike Harrison
Reply-To: mike@whitewing.co.uk
Organization: White Wing Logic
To: Machele Bailey
References: <3B376D95.33E4F177@wfu.edu>
<3B388F64.3C4A75C9@wfu.edu>

I just had another thought on this - if you have an overhead projector
available, it would probably not be that hard to convert a cheap LCD
DMM display for 'transparent' mode - like those old OHP computer
displays. If you're lucky you may even find a model built in such a
way that you could just chop a hole in the back to let the light in.

You'd need to remove the rear reflector from the LCD, and the rear
polariser will probably come off with it, so you'd have to add a new
rear polariser. This might make a very cheap and effective solution if
you can find a unit that is amenable - DMMs usually use low LCD
multiplex rates, which means that contrast should be good enough to do
this.

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