[TechAssist] Re: Home made variable DC Power Supply
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 02 Aug 2003 02:19:34 -0400
Albert, it depends on which plans we are talking about. I'll try to find
some time in the next few days to gather up some info and post it.
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: gary (at) number63.ca
Albert Walfield wrote:
>
> 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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