Subject: Re: [Shop-talk] Help identifying a chip

From: DAVID MASSEY via Shop-talk <[email-masked]>
Date: Mon, 25 Feb 2019 02:07:58 +0000 (UTC)

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	boundary="----=_Part_4580899_837183666.1551060478647"

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Content-Transfer-Encoding: quoted-printable

Actally, you can make it an adjustable regulator but if you are going to or=
der something you may as well get a 317 which is designed for this.=C2=A0 P=
lus the data sheet will give you hints on how to do this.

Dave
On Sunday, February 24, 2019 John Innis via Shop-talk <[email-masked]> w=
rote:
A 7805 is a fixed regulator.=C2=A0 There are other parts in the linear SERI=
ES that are variable output, but if it has a 7805 part number, it will alwa=
ys output a fixed 5v.=C2=A0=20

On Sat, Feb 23, 2019 at 10:08 AM Battmain via Shop-talk <[email-masked]=
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 <[email-masked]=
et> wrote:

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

|=20
|=20
|=20
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 |

 |
|=20
|  |=20
MC7805CT Datasheet, PDF - Alldatasheet

alldatasheet.com

MC7805CT Datasheet, MC7805CT PDF, MC7805CT Data sheet, MC7805CT manual, MC7=
805CT 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=
[email-masked]> wrote: =20
=20
 How about LM7805CT?

On Sat, Feb 23, 2019 at 2:16 AM Battmain via Shop-talk
<[email-masked]> 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
> _______________________________________________
>
> [email-masked]
> Donate: http://www.team.net/donate.html
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> Archive: http://www.team.net/pipermail/shop-talk
>
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>  _______________________________________________

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Archive: http://www.team.net/pipermail/shop-talk

[email-masked]

  _______________________________________________

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Content-Transfer-Encoding: quoted-printable

<p dir=3D"ltr">Actally, you can make it an adjustable regulator but if you =
are going to order something you may as well get a 317 which is designed fo=
r this.&nbsp; Plus the data sheet will give you hints on how to do this.</p=
<p dir=3D"ltr">Dave</p>
</br></br><div class=3D"device_aol_et_org_dt_dd_quote"></div><hr style=3D"b=
order:0;height:1px;color:#999;background-color:#999;width:100%;margin:0 0 9=
px 0;padding:0;"></hr><span style=3D"font-size:14px; color:#999999;">On Sun=
day, February 24, 2019 John Innis via Shop-talk &#60;<span style=3D"color:#=
0000A0">[email-masked]</span>&#62; wrote:</span><br></br><div id=3D"yiv4=
631568107"><html><div><div dir=3D"ltr">A 7805 is a fixed regulator.=C2=A0 T=
here 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.=C2=A0 <br clea=
r=3D"none"></div><br clear=3D"none"><div class=3D"yiv4631568107gmail_quote"=
><div class=3D"yiv4631568107yqt2218788159" id=3D"yiv4631568107yqt02989"><di=
v class=3D"yiv4631568107gmail_attr" dir=3D"ltr">On Sat, Feb 23, 2019 at 10:=
08 AM Battmain via Shop-talk &lt;<a rel=3D"nofollow" shape=3D"rect" ymailto=
=3D"mailto:[email-masked]" target=3D"_blank" href=3D"mailto:shop-=
[email-masked]">[email-masked]</a>&gt; wrote:<br clear=3D"no=
ne"></div><blockquote class=3D"yiv4631568107gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;"><=
div><div class=3D"yiv4631568107gmail-m_4970131661470459166ydp65bf8037yahoo-=
style-wrap" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-ser=
if;font-size:16px;"><div></div>
        <div>Could I use *any* MC7805CT as a replacement, as the first link=
 shows different models of that regulator? Some models of the regulator hav=
e 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 i=
t, was wondering if I should go with the adjustable output regulator or jus=
t stick with a fixed output?</div><div><br clear=3D"none"></div><div><br cl=
ear=3D"none"></div><div>Brian</div><div><br clear=3D"none"></div><div><br c=
lear=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"yiv4631568107gmail-m_4970131661470459166ydp4db1=
db92yahoo_quoted" id=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92=
yahoo_quoted_1335261782">
            <div style=3D"">
               =20
                <div>
                    On Saturday, February 23, 2019, 9:37:17 AM EST, Pat Hor=
ne &lt;<a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:patintexas@iclo=
ud.com" target=3D"_blank" href=3D"mailto:[email-masked]">patintexas@=
icloud.com</a>&gt; wrote:
                </div>
                <div><br clear=3D"none"></div>
                <div><br clear=3D"none"></div>
                <div><div id=3D"yiv4631568107gmail-m_4970131661470459166ydp=
4db1db92yiv6690341354"><div>This chip is a voltage regulator, not the audio=
 amplifier. The part number indicates that it is a 5v fixed regulator.=C2=
=A0<div><br clear=3D"none"></div><div>Peace,=C2=A0</div><div>Pat<br clear=
=3D"none"><br clear=3D"none"><div dir=3D"ltr" id=3D"yiv4631568107gmail-m_49=
70131661470459166ydp4db1db92yiv6690341354AppleMailSignature">Pat Horne=C2=
=A0<div>We support Habitat for Humanity</div><div><br clear=3D"none"></div>=
</div><div class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv6=
690341354yqt0494001998" id=3D"yiv4631568107gmail-m_4970131661470459166ydp4d=
b1db92yiv6690341354yqt20296"><div dir=3D"ltr"><br clear=3D"none">On Feb 23,=
 2019, at 7:35 AM, Battmain via Shop-talk &lt;<a rel=3D"nofollow" shape=3D"=
rect" ymailto=3D"mailto:[email-masked]" target=3D"_blank" href=3D=
"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<b=
r clear=3D"none"><br clear=3D"none"></div><div dir=3D"ltr"><div class=3D"yi=
v4631568107gmail-m_4970131661470459166ydp4db1db92yiv6690341354ydp2bbfaeyaho=
o-style-wrap" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-s=
erif;font-size:16px;"><div></div>
        <div>I did look up that model, however, here is an example from thi=
s site...</div><div><a rel=3D"nofollow" shape=3D"rect" class=3D"yiv46315681=
07gmail-m_4970131661470459166ydp4db1db92yiv6690341354enhancr_card_132898019=
5" target=3D"_blank" href=3D"http://www.alldatasheet.com/view.jsp?Searchwor=
d=3DMC7805CT">MC7805CT Datasheet, PDF - Alldatasheet</a><br clear=3D"none">=
</div><div><br clear=3D"none"></div><div class=3D"yiv4631568107gmail-m_4970=
131661470459166ydp4db1db92yiv6690341354ydp3e0f82ebyahoo-link-enhancr-card y=
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mail-preserve-class yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv6=
690341354ydp3e0f82ebymail-preserve-style" id=3D"yiv4631568107gmail-m_497013=
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cardlink" target=3D"_blank" href=3D"http://www.alldatasheet.com/view.jsp?Se=
archword=3DMC7805CT" style=3D"text-decoration:none;color:rgb(0,0,0);"><tabl=
e class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv6690341354=
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lign:top;border-radius:0px 0px 0px 2px;"></td><td colspan=3D"1" rowspan=3D"=
1" style=3D"vertical-align:middle;padding:12px 24px 16px 12px;width:99%;fon=
t-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif;border-radi=
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ht:19px;margin:0px 0px 6px;font-family:Helvetica Neue, Segoe UI, Helvetica,=
 Arial, sans-serif;color:rgb(38,40,42);">MC7805CT Datasheet, PDF - Alldatas=
heet</h2><p class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv=
6690341354ydp3e0f82ebcard-richinfo-primary" style=3D"font-size:12px;line-he=
ight:16px;margin:0px 0px 4px;color:rgb(151,155,167);">alldatasheet.com</p><=
p class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv6690341354=
ydp3e0f82ebcard-description" style=3D"font-size:12px;line-height:16px;margi=
n:0px;color:rgb(151,155,167);">MC7805CT Datasheet, MC7805CT PDF, MC7805CT D=
ata sheet, MC7805CT manual, MC7805CT pdf, MC7805CT, datenblatt, Elec...</p>=
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le></a><div class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv=
6690341354loadingSpinnerContainer" style=3D"width:100%;min-height:100%;"><d=
iv class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv669034135=
4D_F yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv6690341354F_n yi=
v4631568107gmail-m_4970131661470459166ydp4db1db92yiv6690341354gl_C yiv46315=
68107gmail-m_4970131661470459166ydp4db1db92yiv6690341354ab_C yiv4631568107g=
mail-m_4970131661470459166ydp4db1db92yiv6690341354H_6MGW yiv4631568107gmail=
-m_4970131661470459166ydp4db1db92yiv6690341354o_h"><div class=3D"yiv4631568=
107gmail-m_4970131661470459166ydp4db1db92yiv6690341354W_6MGW yiv4631568107g=
mail-m_4970131661470459166ydp4db1db92yiv6690341354H_6MGW yiv4631568107gmail=
-m_4970131661470459166ydp4db1db92yiv6690341354D_X yiv4631568107gmail-m_4970=
131661470459166ydp4db1db92yiv6690341354ah_1PEzoz"></div></div></div></div><=
div><br clear=3D"none"></div><div><br clear=3D"none"></div><div>They list m=
ultiple models of that chip. The one I think is closest is...</div><div><a =
rel=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D"http://pdf1.allda=
tasheet.com/datasheet-pdf/view/82852/FAIRCHILD/MC7805CT.html">http://pdf1.a=
lldatasheet.com/datasheet-pdf/view/82852/FAIRCHILD/MC7805CT.html</a><br cle=
ar=3D"none"></div><div>because of the variable output.=C2=A0 The amp does h=
ave level/volume pot 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><b=
r clear=3D"none"></div><div><br clear=3D"none"></div>
       =20
        </div><div class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1=
db92yiv6690341354ydpbf13efe9yahoo_quoted" id=3D"yiv4631568107gmail-m_497013=
1661470459166ydp4db1db92yiv6690341354ydpbf13efe9yahoo_quoted_1895949275">
            <div style=3D"">
               =20
                <div>
                    On Saturday, February 23, 2019, 6:30:21 AM EST, Jeff Sc=
arbrough &lt;<a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:fishplate=
@gmail.com" target=3D"_blank" href=3D"mailto:[email-masked]">fishplate=
@gmail.com</a>&gt; wrote:
                </div>
                <div><br clear=3D"none"></div>
                <div><br clear=3D"none"></div>
                <div><div dir=3D"ltr">How about LM7805CT?<br clear=3D"none"=
><div class=3D"yiv4631568107gmail-m_4970131661470459166ydp4db1db92yiv669034=
1354ydpbf13efe9yqt8133710530" id=3D"yiv4631568107gmail-m_497013166147045916=
6ydp4db1db92yiv6690341354ydpbf13efe9yqtfd96835"><br clear=3D"none">On Sat, =
Feb 23, 2019 at 2:16 AM Battmain via Shop-talk<br clear=3D"none">&lt;<a rel=
=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:[email-masked]" ta=
rget=3D"_blank" href=3D"mailto:[email-masked]">[email-masked]=
am.net</a>&gt; wrote:<br clear=3D"none">&gt;<br clear=3D"none">&gt; Finally=
 got around to installing an amplified speaker I had sitting around for yea=
rs.=C2=A0 It was supposed to be a simple install, but looks like I fried so=
mething in the haste.<br clear=3D"none">&gt;<br clear=3D"none">&gt; I alrea=
dy picked up the capacitor in the picture,=C2=A0 but I think the regulator =
might be fried also based on the burn marks.Seems there are different model=
s of that regulator.=C2=A0 The amp is in a 12v application.=C2=A0 Anybody h=
ave any ideas as to what model regulator it is? (or what I could substitute=
 it with? Will be getting it from that auction site. :) )<br clear=3D"none"=
>&gt; Picture in the link...(that&#39;s the best I could get) <a rel=3D"nof=
ollow" shape=3D"rect" target=3D"_blank" href=3D"https://i.imgur.com/FIfJA4O=
.jpg">https://i.imgur.com/FIfJA4O.jpg</a><br clear=3D"none">&gt;<br clear=
=3D"none">&gt; I figure if I throw $5 at it in parts, it wouldn&#39;t hurt =
to try.<br clear=3D"none">&gt;<br clear=3D"none">&gt;<br clear=3D"none">&gt=
; Brian</div><br clear=3D"none">&gt; ______________________________________=
_________<br clear=3D"none">&gt;<br clear=3D"none">&gt; <a rel=3D"nofollow"=
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------=_Part_4580899_837183666.1551060478647--

--===============3170173045552359791==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk

--===============3170173045552359791==--

---

From: DAVID MASSEY via Shop-talk <[email-masked]>
Date: Mon, 25 Feb 2019 13:51:06 +0000 (UTC)

--===============1568231395855865002==
	boundary="----=_Part_4759723_132615334.1551102666740"

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

 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 <[email-masked]>
To: Battmain <[email-masked]>
Cc: [email-masked] <[email-masked]>
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 <[email-masked]=
am.net> wrote:

Brian

|=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... |

 |

 |

IfJA4O.jpg
> I figure if I throw $5 at it in parts, it wouldn't hurt to try.

------=_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;[email-masked]&gt;<br>
To: Battmain &lt;[email-masked]&gt;<br>
Cc: [email-masked] &lt;[email-masked]&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>Digikey for that voltage and case shows the ubiquitous 7805 as well as=
 compatible variations up to 5A:</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>Any part designated 7805-anything should work.</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>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:[email-masked]" target=3D"_blank" remove=
dlink__3d4d3bd2-2fb9-4306-b773-04ad366d8300__href=3D"mailto:shop-talk@autox=
.team.net">[email-masked]</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>Brian</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=
[email-masked]" target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b773-0=
4ad366d8300__href=3D"mailto:[email-masked]">[email-masked]</a=
>&gt; wrote:
                </div>

               =20

               =20

               =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 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:[email-masked]" target=3D"_blank" removedlink__3d4d3bd2-2fb=
9-4306-b773-04ad366d8300__href=3D"mailto:[email-masked]">shop-tal=
[email-masked]</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 class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydp3e0f82ebyahoo-link-enhancr-card yiv4516048183gmail-m_-58090082029271=
18149ydp4db1db92yiv6690341354ydp3e0f82ebymail-preserve-class yiv4516048183g=
mail-m_-5809008202927118149ydp4db1db92yiv6690341354ydp3e0f82ebymail-preserv=
e-style" id=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv66903=
41354ydp3e0f82ebenhancr_card_1328980195" style=3D"max-width:400px;"><a rel=
=3D"noopener noreferrer" shape=3D"rect" class=3D"yiv4516048183gmail-m_-5809=
008202927118149ydp4db1db92yiv6690341354ydp3e0f82ebyahoo-enhancr-cardlink" t=
arget=3D"_blank" style=3D"text-decoration:none;color:rgb(0,0,0);" removedli=
nk__3d4d3bd2-2fb9-4306-b773-04ad366d8300__href=3D"http://www.alldatasheet.c=
om/view.jsp?Searchword=3DMC7805CT"><table class=3D"yiv4516048183gmail-m_-58=
09008202927118149ydp4db1db92yiv6690341354ydp3e0f82ebcard-wrapper yiv4516048=
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ore-table" style=3D"max-width:400px;" cellspacing=3D"0" cellpadding=3D"0" b=
order=3D"0"><tbody><tr><td colspan=3D"1" rowspan=3D"1" width=3D"400"><table=
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1px;border-style:solid;border-color:rgb(224,228,233);border-radius:2px;" wi=
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d colspan=3D"1" rowspan=3D"1" class=3D"yiv4516048183gmail-m_-58090082029271=
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ackground-color:rgb(0,0,0);background-size:cover;border-radius:2px 2px 0px =
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able class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydp3e0f82ebcard-overlay-container-table yiv4516048183gmail-m_-580900820=
2927118149ydp4db1db92yiv6690341354ydp3e0f82ebyahoo-ignore-table" style=3D"w=
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8149ydp4db1db92yiv6690341354ydp3e0f82ebcard-overlay-cell" style=3D"backgrou=
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n=3D"top" bgcolor=3D"transparent"><table class=3D"yiv4516048183gmail-m_-580=
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e=3D"width:100%;min-height:175px;" height=3D"175" border=3D"0"><tbody><tr><=
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1354ydp3e0f82ebcard-share-container"></div>
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an=3D"1" rowspan=3D"1"><table class=3D"yiv4516048183gmail-m_-58090082029271=
18149ydp4db1db92yiv6690341354ydp3e0f82ebcard-info yiv4516048183gmail-m_-580=
9008202927118149ydp4db1db92yiv6690341354ydp3e0f82ebyahoo-ignore-table" styl=
e=3D"background:rgb(255,255,255);width:100%;max-width:400px;border-radius:0=
px 0px 2px 2px;border-top:1px solid rgb(224,228,233);" cellspacing=3D"0" ce=
llpadding=3D"0" border=3D"0" align=3D"center"><tbody><tr><td colspan=3D"1" =
rowspan=3D"1" style=3D"background-color:rgb(255,255,255);padding:16px 0px 1=
6px 12px;vertical-align:top;border-radius:0px 0px 0px 2px;"></td><td colspa=
n=3D"1" rowspan=3D"1" style=3D"vertical-align:middle;padding:12px 24px 16px=
 12px;width:99%;"><h2 class=3D"yiv4516048183gmail-m_-5809008202927118149ydp=
4db1db92yiv6690341354ydp3e0f82ebcard-title" style=3D"font-size:14px;line-he=
ight:19px;margin:0px 0px 6px;">MC7805CT Datasheet, PDF - Alldatasheet</h2>
<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydp3e0f82ebcard-richinfo-primary" style=3D"font-size:12px;line-height:1=
6px;margin:0px 0px 4px;color:rgb(151,155,167);">alldatasheet.com</div>

<div class=3D"yiv4516048183gmail-m_-5809008202927118149ydp4db1db92yiv669034=
1354ydp3e0f82ebcard-description" style=3D"font-size:12px;line-height:16px;m=
argin:0px;color:rgb(151,155,167);">MC7805CT Datasheet, MC7805CT PDF, MC7805=
CT Data sheet, MC7805CT manual, MC7805CT pdf, MC7805CT, datenblatt, Elec...=
</div>
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le></a>
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<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>Brian</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:[email-masked]" target=3D"_blank" removedlink__3d4d3bd2-2fb9-4306-b7=
73-04ad366d8300__href=3D"mailto:[email-masked]">[email-masked]</a=
>&gt; wrote:
                </div>

               =20

               =20

               =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:[email-masked]">[email-masked]</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>
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</blockquote></div>
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