[Shop-talk] Help identifying a chip

[John Innis]

A 7805 is a fixed regulator.  There are other parts in the linear SERIES
that are variable output, but if it has a 7805 part number, it will always
output a fixed 5v.

On Sat, Feb 23, 2019 at 10:08 AM Battmain via Shop-talk <
shop-talk at autox.team.net> wrote:

> Could I use *any* MC7805CT as a replacement, as the first link shows
> different models of that regulator? Some models of the regulator have
> variable output as listed in the second link. I suspect the output should
> stay constant for power, but since the amp output section has the pot on
> it, was wondering if I should go with the adjustable output regulator or
> just stick with a fixed output?
>
>
> Brian
>
>
>
>
>
> On Saturday, February 23, 2019, 9:37:17 AM EST, Pat Horne <
> patintexas at icloud.com> wrote:
>
>
> This chip is a voltage regulator, not the audio amplifier. The part number
> indicates that it is a 5v fixed regulator.
>
> Peace,
> Pat
>
> Pat Horne
> We support Habitat for Humanity
>
>
> On Feb 23, 2019, at 7:35 AM, Battmain via Shop-talk <
> shop-talk at autox.team.net> wrote:
>
> I did look up that model, however, here is an example from this site...
> MC7805CT Datasheet, PDF - Alldatasheet
> <http://www.alldatasheet.com/view.jsp?Searchword=MC7805CT>
>
> MC7805CT Datasheet, PDF - Alldatasheet
>
> alldatasheet.com
>
> MC7805CT Datasheet, MC7805CT PDF, MC7805CT Data sheet, MC7805CT manual,
> MC7805CT pdf, MC7805CT, datenblatt, Elec...
> <http://www.alldatasheet.com/view.jsp?Searchword=MC7805CT>
>
>
> They list multiple models of that chip. The one I think is closest is...
>
> http://pdf1.alldatasheet.com/datasheet-pdf/view/82852/FAIRCHILD/MC7805CT.html
> because of the variable output.  The amp does have level/volume pot on it.
> The other datasheets in the list do not show a variable output.
>
> Brian
>
>
> On Saturday, February 23, 2019, 6:30:21 AM EST, Jeff Scarbrough <
> fishplate at gmail.com> wrote:
>
>
> How about LM7805CT?
>
> On Sat, Feb 23, 2019 at 2:16 AM Battmain via Shop-talk
> <shop-talk at autox.team.net> wrote:
> >
> > Finally got around to installing an amplified speaker I had sitting
> around for years.  It was supposed to be a simple install, but looks like I
> fried something in the haste.
> >
> > I already picked up the capacitor in the picture,  but I think the
> regulator might be fried also based on the burn marks.Seems there are
> different models of that regulator.  The amp is in a 12v application.
> Anybody have any ideas as to what model regulator it is? (or what I could
> substitute it with? Will be getting it from that auction site. :) )
> > Picture in the link...(that's the best I could get)
> https://i.imgur.com/FIfJA4O.jpg
> >
> > I figure if I throw $5 at it in parts, it wouldn't hurt to try.
> >
> >
> > Brian
>
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> >
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>
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