[Shop-talk] Help identifying a chip

[Trevor Boicey]

There are a lot of parts that will work there. As previously mentioned it's
a 1 amp 5 volt regulator in a TO220 case. (TO220 is the case style with
three pins and a heat sink tab with hole for a bolt to attach it to
something metal to keep it cool)

Extremely common and extremely cheap part. Makes nice clean 5V from any
input voltage from about 6V to about 35V. Three pins are just "input
voltage 6V-35V", "output voltage 5V", and ground.

Digikey for that voltage and case shows the ubiquitous 7805 as well as
compatible variations up to 5A:

https://www.digikey.com/products/en/integrated-circuits-ics/pmic-voltage-regulators-linear/699?k=&pkeyword=7805&sv=0&pv1779=56&sf=0&FV=40203a%2Cffe002bb&quantity=&ColumnSort=0&page=1&stock=1&pageSize=25

Any part designated 7805-anything should work.

It likely blew up because something else shorted, but if the shorting was
temporary then it might just need replacing.

Suggestion: Buy a few because they are much cheaper than postage will be,
about 50 cents each at Digikey in quantity <10. Solder in a new one and see
if it works or blows up again.

If it blows up again, look for shorts around the device and fix those
before blowing up another one.

Repeat until it's working or you lose interest.

On Sat, Feb 23, 2019 at 11:01 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
>
> > _______________________________________________
> >
> > Shop-talk at autox.team.net
> > Donate: http://www.team.net/donate.html
> > Suggested annual donation  $12.96
> > Archive: http://www.team.net/pipermail/shop-talk
> >
> > Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/fishplate@gmail.com
>
> >
> _______________________________________________
>
> Shop-talk at autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Archive: http://www.team.net/pipermail/shop-talk
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/patintexas@icloud.com
>
> _______________________________________________
>
> Shop-talk at autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Archive: http://www.team.net/pipermail/shop-talk
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/trevor.boicey@gmail.com
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/shop-talk/attachments/20190223/801e39e6/attachment-0001.html>