Re: [Shop-talk] Help identifying a chip

[DAVID MASSEY via Shop-talk <shop-talk@autox.team.net>]

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 All good stuff but a few points of clarification.=C2=A0 The LM in LM7805CT=
 will change depending on the manufacturer.=C2=A0 You can find L7805 or MC7=
805 or NCP7805 and others.=C2=A0 They will all work.=C2=A0 The CT indicates=
 the package, TO220 in this case.=C2=A0 You want the same package as what i=
s in there now to avoid some cludge job hooking up a different style part.=
=C2=A0 Also, these parts are current limited.=C2=A0 If there is a short dow=
n stream the part will not fail, it will limit the current to the short unt=
il the die temperature reaches 150 deg C at which point it will reduce the =
output current and continue in this mode indefinitely.=C2=A0 These parts ar=
e pretty bullet-proof.=C2=A0 About the only way they will fail is too much =
voltage is applied.=C2=A0 As stated the input voltage can be as high as 35 =
volts but if it is much higher the part will fail.=C2=A0 Typical failure mo=
de is a short input to output and this will pass this high voltage on to th=
e rest of the circuit and may cause other failures.
I say may because it depends on what else is in the circuit.=C2=A0 If there=
 are voltage suppressors and current limiters (fuses) they may protect the =
rest of the circuit.=C2=A0 It depends on what the designer put in there.
We design and manufacture industrial products that are designed to operate =
from a 24 Vdc supply.=C2=A0 It is not uncommon for users to try to power th=
em off of 120 Vac because that is what the old part being replaced used.=C2=
=A0 It was common enough that I designed a protection circuit that would mo=
nitor the input power and only pass it on to the device if it was within th=
e acceptable range.=C2=A0 So, instead of getting a room full of smoke the u=
ser will find the part not working.=C2=A0 When they call in to complain we =
tell them to use the right power.=C2=A0 They do so and the part works as ad=
vertised.=C2=A0 Result: happy customer.=C2=A0=20
=20
Dave=20

=20
=20
-----Original Message-----
From: Trevor Boicey via Shop-talk <shop-talk@autox.team.net>
To: Battmain <battmain@yahoo.com>
Cc: shop-talk@autox.team.net <shop-talk@autox.team.net>
Sent: Mon, Feb 25, 2019 12:31 am
Subject: Re: [Shop-talk] Help identifying a chip

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 th=
ree 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 inp=
ut voltage from about 6V to about 35V. Three pins are just "input voltage 6=
V-35V", "output voltage 5V", and ground.
Digikey for that voltage and case shows the ubiquitous 7805 as well as comp=
atible variations up to 5A:
https://www.digikey.com/products/en/integrated-circuits-ics/pmic-voltage-re=
gulators-linear/699?k=3D&pkeyword=3D7805&sv=3D0&pv1779=3D56&sf=3D0&FV=3D402=
03a%2Cffe002bb&quantity=3D&ColumnSort=3D0&page=3D1&stock=3D1&pageSize=3D25

Any part designated 7805-anything should work.
It likely blew up because something else shorted, but if the shorting was t=
emporary then it might just need replacing.
Suggestion: Buy a few because they are much cheaper than postage will be, a=
bout 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 befor=
e 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@autox.te=
am.net> wrote:

 Could I use *any* MC7805CT as a replacement, as the first link shows diffe=
rent models of that regulator? Some models of the regulator have variable o=
utput as listed in the second link. I suspect the output should stay consta=
nt for power, but since the amp output section has the pot on it, was wonde=
ring 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@i=
cloud.com> wrote: =20
=20
 This chip is a voltage regulator, not the audio amplifier. The part number=
 indicates that it is a 5v fixed regulator.=C2=A0
Peace,=C2=A0Pat

Pat Horne=C2=A0We support Habitat for Humanity

On Feb 23, 2019, at 7:35 AM, Battmain via Shop-talk <shop-talk@autox.team.n=
et> wrote:

 I did look up that model, however, here is an example from this site...MC7=
805CT Datasheet, PDF - Alldatasheet


|=20
|=20
|=20
|  |  |

 |

 |
|=20
|  |=20
MC7805CT Datasheet, PDF - Alldatasheet
alldatasheet.comMC7805CT Datasheet, MC7805CT PDF, MC7805CT Data sheet, MC78=
05CT manual, MC7805CT pdf, MC7805CT, datenblatt, Elec... |

 |

 |



They list multiple models of that chip. The one I think is closest is...htt=
p://pdf1.alldatasheet.com/datasheet-pdf/view/82852/FAIRCHILD/MC7805CT.html
because of the variable output.=C2=A0 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 <fishpl=
ate@gmail.com> wrote: =20
=20
 How about LM7805CT?

On Sat, Feb 23, 2019 at 2:16 AM Battmain via Shop-talk
<shop-talk@autox.team.net> wrote:
>
> Finally got around to installing an amplified speaker I had sitting aroun=
d for years.=C2=A0 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,=C2=A0 but I think the r=
egulator might be fried also based on the burn marks.Seems there are differ=
ent models of that regulator.=C2=A0 The amp is in a 12v application.=C2=A0 =
Anybody have any ideas as to what model regulator it is? (or what I could s=
ubstitute 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/F=
IfJA4O.jpg
>
> I figure if I throw $5 at it in parts, it wouldn't hurt to try.
>
>
> Brian



------=_Part_4759723_132615334.1551102666740
Content-Transfer-Encoding: quoted-printable

<font color=3D'black' size=3D'3' face=3D'Arial, Helvetica, sans-serif'>
<div> <font size=3D"3">All good stuff but a few points of clarification.&nb=
sp; The LM in LM7805CT will change depending on the manufacturer.&nbsp; You=
 can find L7805 or MC7805 or NCP7805 and others.&nbsp; They will all work.&=
nbsp; The CT indicates the package, TO220 in this case.&nbsp; You want the =
same package as what is in there now to avoid some cludge job hooking up a =
different style part.&nbsp; Also, these parts are current limited.&nbsp; If=
 there is a short down stream the part will not fail, it will limit the cur=
rent to the short until the die temperature reaches 150 deg C at which poin=
t it will reduce the output current and continue in this mode indefinitely.=
&nbsp; These parts are pretty bullet-proof.&nbsp; About the only way they w=
ill fail is too much voltage is applied.&nbsp; As stated the input voltage =
can be as high as 35 volts but if it is much higher the part will fail.&nbs=
p; Typical failure mode is a short input to output and this will pass this =
high voltage on to the rest of the circuit and may cause other failures.</f=
ont></div>

<div><font size=3D"3"><br>
</font></div>

<div><font size=3D"3">I say may because it depends on what else is in the c=
ircuit.&nbsp; If there are voltage suppressors and current limiters (fuses)=
 they may protect the rest of the circuit.&nbsp; It depends on what the des=
igner put in there.</font></div>

<div><font size=3D"3"><br>
</font></div>

<div><font size=3D"3">We design and manufacture industrial products that ar=
e designed to operate from a 24 Vdc supply.&nbsp; It is not uncommon for us=
ers to try to power them off of 120 Vac because that is what the old part b=
eing replaced used.&nbsp; It was common enough that I designed a protection=
 circuit that would monitor the input power and only pass it on to the devi=
ce if it was within the acceptable range.&nbsp; So, instead of getting a ro=
om full of smoke the user will find the part not working.&nbsp; When they c=
all in to complain we tell them to use the right power.&nbsp; They do so an=
d the part works as advertised.&nbsp; Result: happy customer.&nbsp; </font>=
<br>
</div>

<div> <br>
</div>

<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Trevor Boicey via Shop-talk &lt;shop-talk@autox.team.net&gt;<br>
To: Battmain &lt;battmain@yahoo.com&gt;<br>
Cc: shop-talk@autox.team.net &lt;shop-talk@autox.team.net&gt;<br>
Sent: Mon, Feb 25, 2019 12:31 am<br>
Subject: Re: [Shop-talk] Help identifying a chip<br>
<br>

<div id=3D"yiv4516048183">
<div>
<div dir=3D"ltr">
<div dir=3D"ltr">There are a lot of parts that will work there. As previous=
ly mentioned it's a 1 amp 5 volt regulator in a TO220 case. (TO220 is the c=
ase style with three pins and a heat sink tab with hole for a bolt to attac=
h it to something metal to keep it cool)
<div><br clear=3D"none"></div>

<div>Extremely common and extremely cheap part. Makes nice clean 5V from an=
y input voltage from about 6V to about 35V. Three pins are just "input volt=
age 6V-35V", "output voltage 5V", and ground.</div>

<div><br clear=3D"none"></div>

<div>Digikey for that voltage and case shows the ubiquitous 7805 as well as=
 compatible variations up to 5A:</div>

<div><br clear=3D"none"></div>

<div><a rel=3D"noopener noreferrer" shape=3D"rect" target=3D"_blank" remove=
dlink__3d4d3bd2-2fb9-4306-b773-04ad366d8300__href=3D"https://www.digikey.co=
m/products/en/integrated-circuits-ics/pmic-voltage-regulators-linear/699?k=
=3D&amp;pkeyword=3D7805&amp;sv=3D0&amp;pv1779=3D56&amp;sf=3D0&amp;FV=3D4020=
3a%2Cffe002bb&amp;quantity=3D&amp;ColumnSort=3D0&amp;page=3D1&amp;stock=3D1=
&amp;pageSize=3D25">https://www.digikey.com/products/en/integrated-circuits=
-ics/pmic-voltage-regulators-linear/699?k=3D&amp;pkeyword=3D7805&amp;sv=3D0=
&amp;pv1779=3D56&amp;sf=3D0&amp;FV=3D40203a%2Cffe002bb&amp;quantity=3D&amp;=
ColumnSort=3D0&amp;page=3D1&amp;stock=3D1&amp;pageSize=3D25</a><br clear=3D=
"none"></div>

<div><br clear=3D"none"></div>

<div>Any part designated 7805-anything should work.</div>

<div><br clear=3D"none"></div>

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

<div><br clear=3D"none">Suggestion: Buy a few because they are much cheaper=
 than postage will be, about 50 cents each at Digikey in quantity &lt;10. S=
older in a new one and see if it works or blows up again.</div>

<div><br clear=3D"none"></div>

<div>If it blows up again, look for shorts around the device and fix those =
before blowing up another one.<br clear=3D"none"><br clear=3D"none">Repeat =
until it's working or you lose interest.</div>
</div>
</div>
<br clear=3D"none">
<div class=3D"yiv4516048183gmail_quote">
<div class=3D"yiv4516048183yqt5781042560" id=3D"yiv4516048183yqt23979">
<div class=3D"yiv4516048183gmail_attr" dir=3D"ltr">On Sat, Feb 23, 2019 at =
11:01 AM Battmain via Shop-talk &lt;<a rel=3D"noopener noreferrer" shape=3D=
"rect" ymailto=3D"mailto:shop-talk@autox.team.net"; target=3D"_blank" remove=
dlink__3d4d3bd2-2fb9-4306-b773-04ad366d8300__href=3D"mailto:shop-talk@autox=
.team.net">shop-talk@autox.team.net</a>&gt; wrote:<br clear=3D"none"></div>
<blockquote class=3D"yiv4516048183gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp65bf8037yahoo-sty=
le-wrap">
<div></div>

       =20
<div>Could I use *any* MC7805CT as a replacement, as the first link shows d=
ifferent models of that regulator? Some models of the regulator have variab=
le output as listed in the second link. I suspect the output should stay co=
nstant for power, but since the amp output section has the pot on it, was w=
ondering if I should go with the adjustable output regulator or just stick =
with a fixed output?</div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div>Brian</div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

       =20
        </div>

<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yahoo_quo=
ted" id=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yahoo_quoted=
_1335261782">
           =20
<div>
               =20
               =20
<div>
                    On Saturday, February 23, 2019, 9:37:17 AM EST, Pat Hor=
ne &lt;<a rel=3D"noopener noreferrer" shape=3D"rect" ymailto=3D"mailto:pati=
ntexas@icloud.com" target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b773-0=
4ad366d8300__href=3D"mailto:patintexas@icloud.com";>patintexas@icloud.com</a=
>&gt; wrote:
                </div>

               =20
<div><br clear=3D"none"></div>

               =20
<div><br clear=3D"none"></div>

               =20
<div>
<div id=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034135=
4">
<div>This chip is a voltage regulator, not the audio amplifier. The part nu=
mber indicates that it is a 5v fixed regulator.&nbsp;
<div><br clear=3D"none"></div>

<div>Peace,&nbsp;</div>

<div>Pat<br clear=3D"none"><br clear=3D"none">
<div dir=3D"ltr" id=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92=
yiv6690341354AppleMailSignature">Pat Horne&nbsp;
<div>We support Habitat for Humanity</div>

<div><br clear=3D"none"></div>
</div>

<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354yqt0494001998" id=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db=
92yiv6690341354yqt20296">
<div dir=3D"ltr"><br clear=3D"none">On Feb 23, 2019, at 7:35 AM, Battmain v=
ia Shop-talk &lt;<a rel=3D"noopener noreferrer" shape=3D"rect" ymailto=3D"m=
ailto:shop-talk@autox.team.net" target=3D"_blank" removedlink__3d4d3bd2-2fb=
9-4306-b773-04ad366d8300__href=3D"mailto:shop-talk@autox.team.net";>shop-tal=
k@autox.team.net</a>&gt; wrote:<br clear=3D"none"><br clear=3D"none"></div>

<div dir=3D"ltr">
<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydp2bbfaeyahoo-style-wrap">
<div></div>

       =20
<div>I did look up that model, however, here is an example from this site..=
.</div>

<div><a rel=3D"noopener noreferrer" shape=3D"rect" class=3D"yiv4516048183gm=
ail-m_-5809008202927118149ydp4db1db92yiv6690341354enhancr_card_1328980195" =
target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b773-04ad366d8300__href=
=3D"http://www.alldatasheet.com/view.jsp?Searchword=3DMC7805CT";>MC7805CT Da=
tasheet, PDF - Alldatasheet</a><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
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ight:19px;margin:0px 0px 6px;">MC7805CT Datasheet, PDF - Alldatasheet</h2>
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1354D_F yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv6690341354F_=
n yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv6690341354gl_C yiv=
4516048183gmail-m_-5809008202927118149ydp4db1db92yiv6690341354ab_C yiv45160=
48183gmail-m_-5809008202927118149ydp4db1db92yiv6690341354H_6MGW yiv45160481=
83gmail-m_-5809008202927118149ydp4db1db92yiv6690341354o_h">
<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354W_6MGW yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034135=
4H_6MGW yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv6690341354D_=
X yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv6690341354ah_1PEzo=
z"></div>
</div>
</div>
</div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

<div>They list multiple models of that chip. The one I think is closest is.=
..</div>

<div><a rel=3D"noopener noreferrer" shape=3D"rect" target=3D"_blank" remove=
dlink__3d4d3bd2-2fb9-4306-b773-04ad366d8300__href=3D"http://pdf1.alldatashe=
et.com/datasheet-pdf/view/82852/FAIRCHILD/MC7805CT.html">http://pdf1.alldat=
asheet.com/datasheet-pdf/view/82852/FAIRCHILD/MC7805CT.html</a><br clear=3D=
"none"></div>

<div>because of the variable output.&nbsp; The amp does have level/volume p=
ot on it. The other datasheets in the list do not show a variable output.</=
div>

<div><br clear=3D"none"></div>

<div>Brian</div>

<div><br clear=3D"none"></div>

<div><br clear=3D"none"></div>

       =20
        </div>

<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydpbf13efe9yahoo_quoted" id=3D"yiv4516048183gmail-m_-580900820292711814=
9ydp4db1db92yiv6690341354ydpbf13efe9yahoo_quoted_1895949275">
           =20
<div>
               =20
               =20
<div>
                    On Saturday, February 23, 2019, 6:30:21 AM EST, Jeff Sc=
arbrough &lt;<a rel=3D"noopener noreferrer" shape=3D"rect" ymailto=3D"mailt=
o:fishplate@gmail.com" target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b7=
73-04ad366d8300__href=3D"mailto:fishplate@gmail.com";>fishplate@gmail.com</a=
>&gt; wrote:
                </div>

               =20
<div><br clear=3D"none"></div>

               =20
<div><br clear=3D"none"></div>

               =20
<div>
<div class=3D"yqt5781042560" id=3D"yqt14036">How about LM7805CT?<br clear=
=3D"none">
<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydpbf13efe9yqt8133710530" id=3D"yiv4516048183gmail-m_-58090082029271181=
49ydp4db1db92yiv6690341354ydpbf13efe9yqtfd96835"><br clear=3D"none">On Sat,=
 Feb 23, 2019 at 2:16 AM Battmain via Shop-talk<br clear=3D"none">&lt;<a re=
l=3D"noopener noreferrer" shape=3D"rect" ymailto=3D"mailto:shop-talk@autox.=
team.net" target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b773-04ad366d83=
00__href=3D"mailto:shop-talk@autox.team.net";>shop-talk@autox.team.net</a>&g=
t; wrote:<br clear=3D"none">&gt;<br clear=3D"none">&gt; Finally got around =
to installing an amplified speaker I had sitting around for years.&nbsp; It=
 was supposed to be a simple install, but looks like I fried something in t=
he haste.<br clear=3D"none">&gt;<br clear=3D"none">&gt; I already picked up=
 the capacitor in the picture,&nbsp; but I think the regulator might be fri=
ed also based on the burn marks.Seems there are different models of that re=
gulator.&nbsp; The amp is in a 12v application.&nbsp; Anybody have any idea=
s as to what model regulator it is? (or what I could substitute it with? Wi=
ll be getting it from that auction site. :) )<br clear=3D"none">&gt; Pictur=
e in the link...(that's the best I could get) <a rel=3D"noopener noreferrer=
" shape=3D"rect" target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b773-04a=
d366d8300__href=3D"https://i.imgur.com/FIfJA4O.jpg";>https://i.imgur.com/FIf=
JA4O.jpg</a><br clear=3D"none">&gt;<br clear=3D"none">&gt; I figure if I th=
row $5 at it in parts, it wouldn't hurt to try.<br clear=3D"none">&gt;<br c=
lear=3D"none">&gt;<br clear=3D"none">&gt; Brian</div>
<br clear=3D"none"><br clear=3D"none"></div>
</div>
</div>
</div>
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</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote></div>
</div>
</div>
</div>
</div>
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