Author Topic: build it  (Read 5077 times)

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Offline k9yli

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build it
« on: March 04, 2009, 10:01:11 AM »
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

Offline KI4RVH

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build it
« Reply #1 on: March 04, 2009, 05:04:23 PM »
K9yli,

I moved this over here in Home Brew so it would get more attention.  I left a redirect in radio.  Good job on the Power Supply.  Post us some pics if you can.

73

Chris

Offline mustang66

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build it
« Reply #2 on: March 07, 2009, 08:37:09 PM »
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.

Offline k9yli

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pictures power supply
« Reply #3 on: March 08, 2009, 10:17:56 AM »
i\'ll try this..  first version
it worked.   transformer was too tall for original  case.

Offline k9yli

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power supply
« Reply #4 on: March 08, 2009, 10:19:55 AM »
second version.
built in  surplus  rack mount.

Offline k9yli

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power supply
« Reply #5 on: March 08, 2009, 10:29:53 AM »
try again.  internet problem
third version..

Offline k9yli

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power supply
« Reply #6 on: March 08, 2009, 10:36:17 AM »
the  third   innards.  not complete  here .

Offline LoraHup

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build
« Reply #7 on: December 02, 2009, 05:03:29 PM »
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

Offline k9yli

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build it
« Reply #8 on: January 04, 2010, 10:52:06 AM »
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.