[TechAssist] Re: good sub 78m05a

  • From: "J Silverman" <greentron@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 30 Dec 2005 21:01:17 -0500

You can if you have an isolated transformer winding to power it.
Jerry Silverman Greentron Inc
Mail to: greentron@xxxxxxx
4 Newland Ave Greenville SC
29609                864 232 3889
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, December 30, 2005 8:00 PM
Subject: [TechAssist] Re: good sub 78m05a


> You are correct.
>
> I think Phil had too much pre-New Year's spirit.
>
> Right, Phil?
>
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL  32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
> On Fri, 30 Dec 2005 14:09:06 -0500 "Christopher Barnak"
> <cbarnak@xxxxxxxxxxxxx> writes:
> > 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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