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Date: | Mon, 13 Apr 2015 14:32:50 -0700 |
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Hello Butch. A friend of mine made me an LED detector that emits a tone
when the nose of the device is placed over an LED or any light source for
that matter. It runs on a 9V battery, and it works slick as snot. I can
attempt to get the schematic, assuming that he actually drew one. I believe
that all of the parts combined came to about $10.
Alan - N7MIT
Alan R. Downing
Phoenix, AZ
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Butch Bussen
Sent: Monday, April 13, 2015 2:07 PM
To: [log in to unmask]
Subject: Re: light detector
Unfortunately I'm no good at soldering stuff like that. Some one else
mentioned a circuit using transisters. I'd like to have that diagram,
as I might be able to do that, although the only transister audio
oscilators I recall used a center tapped audio transformer.
73
Butch
WA0VJR
Node 3148
Wallace, ks.
On Tue, 14
Apr 2015, Dave Allen wrote:
> Hi Butch!
>
> Many thanks for the design and description.
>
> A couple years ago, I contacted the Blind Foundation's equipment shop and
> told them I wanted to buy a light probe. They had no idea what I was
talking
> about. I sourced one overseas, as that's what local incompetence generally
> promotes, hi hi.
>
> 73,
> Dave
>
>
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