[TechAssist] Re: Home made variable DC Power Supply
- From: Albert Walfield <albertwalfield@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 01 Aug 2003 20:49:10 -0300
Gary is the current adjustable as well I am looking for one. Mine is just
plain worn & abused to death.
thanks
Albert Walfield
Albert Walfield's Electronics
RR#3
Bridgewater
Nova Scotia
CANADA
B4V 2W2
Phone or Fax # 902 543-9831
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, August 01, 2003 2:55 AM
Subject: [TechAssist] Re: Home made variable DC Power Supply
> Warren, that 8 pin IC was probably an op-amp such as an LM301, LM741 or
> similar.
>
> I have plans for a nice and easy regulated power supply, variable from
> 1.2V up to approx. 35V and at 5 amps. I'll either find the schematic or
> draw it up for you. It involves an LM338 3 pin variable regulator. A
> cheaper LM317T could also be used with the TO-3 transistor set up as a
> bypass to provide the heavier amperage required. If zero volts output is
> required, then the regulator would have to be somehow referenced to
> -1.2V to bring the output down to zero.
>
> I have plans too, for a 0V to 35V supply but it involves more parts.
> This one has variable current limiting adjustment as well.
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: gary (at) number63.ca
>
>
>
>
>
>
> "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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> --
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: gary (at) number63.ca
>
>
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