Re: Microwave Oven Choke (What's it for?)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dale Nassar by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dnassar-at-i-55-dot-com>

It should be the filament transformer--I have the same one!  ADVANCE 
TRANSFORMER CO put these separate transformers in that model.  You can put 
120VAC into the primary and get about 5VAC and LOTS of current at the 
secondary--it should be two leads on the other side (not visible in the 
photo) with thick magnet wire connected to two terminals.  This thing makes 
a GREAT 5v high-current DC power supply--use a low-dropout regulator though.
--dale nassar


At 07:05 PM 6/21/02 -0600, you wrote:
>Original poster: "Gregory Hunter by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
>
>Dear List,
>
>A friend gave me an old Amana "Radar Range". It
>belonged to his elderly mother. She said it started
>making a scary noise, and she didn't want it anymore.
>It's not just a cliche when I say they don't make them
>like that anymore, because they really don't:
>
>http://hot-streamer-dot-com/greg/amanal.jpg
>
>This thing had at least 50 lbs of steel chassis--built
>like a tank. The label says it was manufactured in
>February 1977!
>
>Getting back to the actual subject--this thing had an
>unusual component in the power supply section--an iron
>core choke. Have a gander:
>
>http://hot-streamer-dot-com/greg/amanad.jpg
>
>The rest of the PSU is conventional in every respect.
>Big 2300vac MOT on the left, .85uF/2500wvac capacitor
>with external bleeder resistor, bloc-style HV
>rectifier--the classic half-wave voltage doubler.
>Whatever the choke is, it is involved in the HV
>circuit. The high tension leads for the magnetron pass
>thru it. Oddly enough, I don't see a filament winding
>on the MOT. Could this be a filament xfmr, or perhaps
>a ballast for a 120vac filament? Any appliance repair
>tradesmen out there? What is that thing?
>
>Regards,
>
>Greg
>http://hot-streamer-dot-com/greg