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#1
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![]() I just finished my third copy of the ARRL HANDBOOK 28 volt power supply,
modified to 13.8 volts. I started with a 44volt 16 amp transformer purched for $5 at a , you got it, a farm show flea market.. Using a digital volt meter and a sharp tool I found the exact center of the output winding within a few hundredths of a volt. I cut the winding with a dremel tool and added two wires to parallel the windings , making a 22 volt 32 amp winding. Built the whole thing in a cabinet from a TV sweep generator. I used a different output transistor than the 3055s called for. I used a 30 amp version. With the sheetmetal work etc, I have abut 40 hours in it. Get out there and build.!!!!!!! I have ictures but can't figure out how to insert them. right clik image doesnt work Last edited by k9yli : 03-06-2009 at 12:19 PM. Reason: pictures |
#3
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![]() K9yli,
Good job on the supply. To post the pic you will need to shrink it in size. The web host will not accept large files. Click, manage attachments>browes>upload>close window. That should do it. I will try a test file. |
#4
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![]() i'll try this.. first version
it worked. transformer was too tall for original case. |
#5
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![]() second version.
built in surplus rack mount. |
#6
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![]() try again. internet problem
third version.. |
#7
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![]() the third innards. not complete here .
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#8
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![]() AH this build is killing me. i was expecting something not as bad. i just got this kit a couple of days ago and am having a killer time attaching the lower piece to the upper piece. also must everything that says "put locktight" have to have it? im guessing it would be a good idea...? Just let me know. Cheers,Vanka
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#9
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![]() don't have loctight???
just use a little finger nail polish.... or some silicone sealer,/ tub and tile sealer.. moist any glue. just a dab as you may want to remove it some time. red bottle locktite,, stays some what soft so easy to remove but wont vibrate loose. |
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