GA to 8ohm Headphone Adapter Completed

Having posted to this group before, I though I would just provide
the follow up.

I completed a transformer design - thanks for people who
posted in the group with information.

Instead of paying $75 - $150 for an adapter, I constructed
what is the equivalent of 500 ohm source impedance to
4 ohm (actually, 2 8-ohm earbuds in parallel) adapter.
I've tested the unit and am quite happy with it.

I used a stereo 1/4" male adapter cable into a 3-piece
PVC tube assembly (2 end caps and a 3" piece - stock off
the shelf from Home Depot).
I used a Radio Shack $2.99 audio transformer and using
my old engineering days book, insured that I had the right
impedance transformation ratio.

Not including my labor (hee hee), I spent a grand total
of approximately $7 in parts.

In general, most aviation radios expect too see 200-ohm to 600-ohm
loads. Higher loads are typically fine, but lower isn't a good idea.
If one uses 16-ohm headphones or 32-ohm headphones (not uncommon
at all), the load impedance seen by the radio is higher.
This prevent excessive current loading, but higher will affect
"optimum" power transfer. It is safe, nonetheless.

The reason I did this: As an engineer and musician for a music company,
I have some very high-end custom molded, in-ear headphones that
I found are very comfortable and work very well in the plane.

Now - I have to obtain a boom mic to use . . .that hasn't been
as easy as it sounds for my "low budget" approach . . .

I thought some of you might be interested to hear how I finished that up.

Good flying!

Gary