[TechAssist] Re: Home made variable DC Power Supply
- From: "George" <grndmstrg@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 1 Aug 2003 08:56:57 -0700
PS 723 = NTE 923
George
Afana Electronics
Moreno Valley, CA
grndmstrg@xxxxxxxxxxxx
----- Original Message -----
From: "George" <grndmstrg@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, August 01, 2003 8:09 AM
Subject: [TechAssist] Re: Home made variable DC Power Supply
> Warren,
>
> That IC is most likely a 723 (Ex: uA723) came in T03 can and DIP and was
> made by several semiconductor companies. This IC was popular about 20-25
> years ago. Adjustable from 1.2 to 37 volts at about 150-200 ma or so. The
> series bypass transistor provides the higher ampere current capacity and
has
> current limiting. I built several power supplies using this IC with good
> results.
>
> George
> Afana Electronics
> Moreno Valley, CA
> grndmstrg@xxxxxxxxxxxx
>
> ----- Original Message -----
> From: "Warren C." <warrenca@xxxxxxxxx>
> To: "techassist" <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, July 31, 2003 9:52 PM
> Subject: [TechAssist] Home made variable DC Power Supply
>
>
> > 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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