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Re: Street Style Headphones

From: Doug Sutherland <>
Date: Fri, 1 Dec 2000 13:05:39 -0800

Christopher Allen wrote:

> I'm curious about the Sony Street Style headphones
<snip>
> The FM radio model looks interesting
<snap>

Speaking of RM radios, I picked up a small FM radio with 
headphones at the drugstore for $6, it's a keychain. The 
enclosure is about 1 x 1.5 inches, and there is a scan 
button. I was thinking about ripping this apart and 
popping off the scan button, then controlling that button
with a digital switch. 

This is part of my "dymanic interconnection" dream where 
software can switch between the audio sources. If I can 
figure out how to switch between multiple audio sources
I could use software to connect the FM radio to my ear
phone, then switch to mp3, then switch to connecting a 
cellular phone to the earphone and microphone. I could 
also use small relays to switch the power to peripherals. 
I could use software to switch on the FM radio, connect 
the audio from the FM radio to my earphone, and even 
"press" the scan button via software ...

Here is a circuit that can switch between audio sources
(and video too!) but it's way too big. 

http://www.controlanything.com/html/asel.htm

What I need is to do this on a much smaller scale. I 
think I saw some chips at the analog devices web site 
that can do the same. The relay switching for power 
might me one of the ways to leverage the dallas semi 
1-wire microlan: they have very tiny digital switches
that can attach to relays.

  -- Doug  

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