[TechAssist] Re: Home made variable DC Power Supply
- From: "George" <grndmstrg@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 1 Aug 2003 08:09:21 -0700
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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