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<div class="moz-cite-prefix">On 10/27/2014 01:02 AM, Matt Bailey
wrote:<br>
</div>
<blockquote cite="mid:20141027010245.3e71deba@SlackLappy.deuce"
type="cite">
<pre wrap="">Question: What sort of dimmer device is typically used in old business
jets? Just a standard triac? I'm trying to figure out exactly what is
in my Sabreliner.
Second question: how tolerant are typical aircraft AC transformers and
power regulators to variations in frequency? For instance, I have
115v/400hz coming off my inverter, but it breaks down to 5v AC for
lighting (and 26v AC for other stuff). I'm wondering how critical it is
to maintain the 400hz frequency.
</pre>
</blockquote>
OK I have a dimer Boeing 7xx stuff its made OECO #200-16408-02 NSN
5950-00-920-1174<br>
It is a Variable Transformer 3 leads:<br>
<ol>
<li>Top or power via an internal switch</li>
<li>Bottom or power return.</li>
<li>Wiper or dimmed voltage to the lamps</li>
</ol>
You will most likely have to run 400 Hz as when you run lower
frequency’s ie. 60 Hz it will get very hot...<br>
If I remember the cores of the 400 Hz transformers use a different
metal in the laminations. <br>
You have to remember that you can run lighter weight & smaller
components at the higher frequency.<br>
You can run 400 Hz via a 60 Hz transformer but it will <i>sing</i>.
What I found out is that you can try audio transformers.<br>
Enjoy <br>
~~ Cris H<br>
<br>
<br>
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