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[CQ-Contest] Optical and galvanic isolation

To: <cq-contest@contesting.com>
Subject: [CQ-Contest] Optical and galvanic isolation
From: "VA3NR" <va3nr@arrl.net>
Date: Tue, 19 Dec 2006 18:14:03 -0500
List-post: <mailto:cq-contest@contesting.com>
Hi Paul,
- I've built keyers with optoisolators and also just with FETs and never had a 
problem with either method.

- Regarding audio transformers: I built my original so2r headphone switch 
without one and had constant buzz in audio from one of the rigs.  I added one 
transformer (on the audio from the left rig) to allow isolating the grounds 
between rigs and it silenced the buzz.  I used a 1:1 audio transfromer from 
local electronics store with no mfr. or part number markings.

Chris VA3NR.
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