dlj04(at)josephson.com
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 Posted: Thu Sep 10, 2015 8:19 am Post subject: Headphone jack wiring |
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On 9/9/15 11:59 PM, Avionics-List Digest Server wrote:
| Quote: | From: Detlef Heun <detlili(at)email.de>
Subject: Headphone Jack Wiring Mono to Stereo Icom A-210
I bought a Icom A-210. Unfortunately it has only a Mono output.
Can I wire the Mono output to the Left and Right tab of a Stereo
Headphone Jack?
Thanks
You can, the problem is that if you then plug a mono headphone into the
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stereo jack, the sleeve (ground terminal) will connect to the right
channel (ring contact of the tip-ring-sleeve jack) and short the output
to ground. A solution commonly used in broadcast stations where this
problem also occurs is to connect the mono output of the radio through
~300 ohm resistors to the left and right tabs of the jack. If you use a
stereo headphone, the level is reduced somewhat because each channel has
a resistor in series with it. If you use a mono headphone, the output
sees another 300 ohms to ground rather than a dead short. It's a good
compromise if the radio has enough volume to drive the headphones you're
using even with the additional loss of the resistors.
David Josephson
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