I've been answering this same exact question for thirty-three years exactly the
same way, and I'm not going to go into the song and dance here again. You can
google the answer if you like, or you can download Applications Note 1 (the one
I wrote back in 1972 as amended through last year) from www.rstengineering.com
if you want the long answer.

Or, I can reproduce it here if you all would like some flame bait.

Jim


"Dan Thompson"
shared these priceless pearls of wisdom:

-Wouldn't replacing an approved dimmer assembly with a home-made one be a
-"major alteration" that would require a Form 337, and field approval of the
-data, for return to service?



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com