[TechAssist] Re: good sub 78m05a

  • From: "Damon" <DamonEB@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 31 Dec 2005 00:38:43 -0500

Now I know YOU were joking.....
But Jerry Silverman is serious about the isolated winding and a positive
regulator being used to create a negative voltage regulator.....the positive
side of that is grounded and the negative side is your source....

Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Philip Bader" <pbader@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 30, 2005 11:40 PM
Subject: [TechAssist] Re: good sub 78m05a


> Dead God fellas, now don't try flipping a positive regulator trying to get
> negative out! I was kidding!
> Phil
> Philip Bader
> Polk County School Board
> Electronics Shop
> Bartow,Fl.
> (former owner, Jan Phyl TV INc.,
> Winter Haven, Fl. from 1976-2006)
> email: pbader@xxxxxxxxxxxxxxx
>
> ----- Original Message -----
> From: "Christopher Barnak" <cbarnak@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, December 30, 2005 2:09 PM
> Subject: [TechAssist] Re: good sub 78m05a
>
>
> > Phil,
> > I use to design custom circuits when I used to work at the
> > GE TV plant in Portsmouth, Va. We were never able to use
> > a positive regulator for a negative regulator, we had to use
> > the 79xx series regulators for negative voltages.
> >
> >
> > Christopher Barnak, CET
> > Norfolk Public Schools
> > Electronics Maintenance
> > 966 Bellmore Ave.
> > Norfolk, Va. 23504
> >
> > Phone 757 628 3385
> > Fax    757 628 3392
> > cbarnak@xxxxxxxxxxxxx
> >
> >
> >>>> pbader@xxxxxxxxxxxxxxx 12/30/05 11:16 AM >>>
> > And that ground leg zener trick opens up a way to make a variable
> > regulated
> > DC power supply source.I imagine with a pot in the ground leg,or some
> > such
> > arrangement? Now, if you need a negative polarity output from a
> > positive
> > output reg IC,just turn the reg upside down.
> > ;-)
> > Phil
> > Philip Bader
> > Polk County School Board
> > Electronics Shop
> > Bartow,Fl.
> > (former owner, Jan Phyl TV INc.,
> > Winter Haven, Fl. from 1976-2006)
> > email: pbader@xxxxxxxxxxxxxxx
> >
> > ----- Original Message -----
> > From: "Gary McCartney" <gary@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, December 30, 2005 11:11 AM
> > Subject: [TechAssist] Re: good sub 78m05a
> >
> >
> >> Yes, certainly a 78M05 can be subbed with a 7805. 78M05 is rated 0.5
> >> amps and a 7805 is rated 1 Amp. There is no reason to even stock the
> >> 78M05, just have a few 7805's on hand. Same goes for any other
> > regulator
> >> in the family- 7812, 7808, etc.
> >>
> >> Generally speaking, over the years reading these tech emails, I am
> >> amazed at the lack of knowlege about these IC's, they are basic
> >> fundamental electronic components like a diode or a transistor. Any
> >> reasonings?
> >>
> >> Did you know that you can raise the output voltage of a 78xx series
> >> regulator, by inserting a zener diode from the ground pin of the IC
> > to
> >> ground? If you want an 8V regulator but only have a 5V regulator 7805
> > in
> >> stock, you can insert a 3V zener from pin 2 of the reg to ground and
> > get
> >> an 8V reg. (as long as the back plane of the regulator IC is not
> >> connected to ground itself because it is common with pin 2, unless
> > of
> >> course we are talking about a plastic backed IC)
> >>
> >>
> >>
> >>
> >> Gary McCartney
> >>
> >> McCartney Electronics
> >> Guelph Ontario Canada
> >> Est. 1984
> >> email: gary (at) number63.ca
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> pete wrote:
> >>> can i use a 7805a to sub a 78m05a anyone has done this before? its a
> > 5
> >>> volt regulator from a sony power supply model is kv35v35
> >>> Perdomo Tv Inc Since 1972
> >>> Miami.Fl
> >>>
>
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