[Shop-talk] Help identifying a chip

[Battmain]

 Thanks everyone.  I ordered a few 7805 fixed regulators from the auction site. $2. Hopefully it gets to me in the usual 21 days.  The application is an old amplified Bazooka tube. The output specs are relatively low, so if the parts don't work, I am positive I can get one of the generic $12-$15 amp boards to drive the single woofer in the tube. I will not pay $99-$125 for a replacement amp.  
@Pat, yeah, I ordered similar micro farad replacement cap as the one next to it and I did that before I posted. If it blows up the replacement, then I will go with the higher voltage, but the limit to spend is $5 in parts. After that, I'll go with an amp board. 
Brian


    On Sunday, February 24, 2019, 9:08:04 PM EST, DAVID MASSEY <dave1massey at cs.com> wrote:  
 
 
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 for this.  Plus the data sheet will give you hints on how to do this.

Dave
On Sunday, February 24, 2019 John Innis via Shop-talk <jdinnis at gmail.com> wrote:
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


| 
| 
| 
|  |  |

 |

 |
| 
|  | 
MC7805CT Datasheet, PDF - Alldatasheet

alldatasheet.com

MC7805CT Datasheet, MC7805CT PDF, MC7805CT Data sheet, MC7805CT manual, MC7805CT pdf, MC7805CT, datenblatt, Elec...
 |

 |

 |



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/jdinnis@gmail.com




-- 
=================================
= Never offend people with style when you   =
= can offend with substance --- Sam Brown  =
=================================_______________________________________________

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/dave1massey@cs.com

  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/shop-talk/attachments/20190225/e78e5f00/attachment.html>