HP-1000E PSU

From: Carlos Murillo-Sanchez <cem14_at_cornell.edu>
Date: Mon Jun 26 15:02:19 2000

Tony Duell wrote:
> Bob: As you have one of these supplies in front of you, what is it? I
> there a big iron-cored transformer? Is there a medium-sized ferrite-cored
> transformer? What about capacitors of a few hundred uF with working
> voltages around 200V?
>
> -tony

OK, I'll bite, as I have one of these; I am in a bit
of a hurry right now so I won't disassemble the thing
entirely -- it has way too many screws and plates.

The supply is rated 8A max, 110V, 47.5-66Hz in the rear plate.
No large transformers. There is a large EMI filter right at the
mains, then the input circuitry features a large coil, two
1150 uF _at_ 200V caps, one small transformer which I think
supplies what seems to be a small control board nearby,
then another board with five IOR 4-772 TO-3 transistors;
several diodes and something that looks like a bridge
(sorry; can't get a good look without disassembling)
there is another transistor nearby in the main board,
a 2S02429; all of these components seem to be part of
the main switcher; later on there are more
caps, transistors, SCR's and a multiple-tap xformer
(laminated core!). It looks like a two-stage switcher to me.

carlos.

-- 
Carlos Murillo-Sanchez    email:  cem14_at_cornell.edu  
428 Phillips Hall, Electrical Engineering Department
Cornell University, Ithaca, NY 14853
Received on Mon Jun 26 2000 - 15:02:19 BST

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