[TechAssist] Re: Home made variable DC Power Supply
- From: "Warren C." <warrenca@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 03 Aug 2003 09:26:18 -0400
Hi All
UPDATE
On a hunch that I may have built it from plans in an older arrl (ham radio)
handbook, I searched in my
older books JACKPOT* Year 1973 has the exact plans I used. The original IC
number was CA3055
which still seems to be unavailable? IC321 must have been an elcom cross in
those days!!!!
This is a good PS if you wish to build one,------ if we can find a source for
this IC ???
Thank,s to all who replied.
Warren C
"Warren C." wrote:
> Hi All
>
> My old DC PS finally Quit regulating, problem is it was built so many
> years ago
> that I no longer have the schem.
> It controls the Voltage output from 35 V down to about 1.5V
> The current can be adjusted from 2A down to about 5ma.
>
> I've found some bad caps and replaced them but it still does not
> regulate down below
> 10 V and it used to.
> The main problem (I think) is the reg. IC# is IC321 and I can't find it
> or cross it.
> It is a 5/16" can type with 8 legs on it. The IC controls a large heat
> sinked T O 3 trans.
>
> Does anyone have info on this IC??
> I would welcome your schematics for similar home made PS's
>
> Secondly where in Canada can I buy a ESR cap tester. No insult but I
> had a bad experience
> years ago with an electronics company in the States. I sent down a mail
> order for about $350.00
> It was cashed but never received any thing for it and no replies
> afterwards..!
>
> TIA
>
> Warren Campbell
> Campbell's TV & Appliances
> Cannington On
> Canada
>
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