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Re: [CQ-Contest] Mixer

To: "Keith Dutson" <kdutson@sbcglobal.net>, "'Joe'" <nss@mwt.net>, <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] Mixer
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Tue, 26 Jun 2012 08:12:05 -0400
List-post: <cq-contest@contesting.com">mailto:cq-contest@contesting.com>
> Input is via mini phono plug or RCA connector.  There are two DC input
> connectors, ganged together to carry power to another accessory.  I wired
> audio and DC from the accessory outlet 1, pins 2,5 and 7, on the back of 
> the
> Icom 775.

There probably is the potential to drive 20 headsets with a single car 
stereo IC chip power amplifier.

If you use a fairly high power (compared to the power headsets need) audio 
source with low source impedance, you can bridge a half dozen headsets 
across the line without change.

Most radios fulfill this requirement on the speaker jacks.

Then a variable L pad can be used for volume, if needed, or even just a 500 
ohm pot.

73 Tom 

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