View unanswered posts | View active topics It is currently Wed Mar 29, 2017 2:07 pm



Reply to topic  [ 67 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next
Simple Cheap Compact IC-based High Performance Amp 
Author Message
LQFP144 - On Top Of The Game
User avatar

Joined: Tue Mar 02, 2010 2:33 pm
Posts: 1201
Location: Australia
What ic are you using or have in mind mate? Fully solid state, class AB or class D?


Fri Jan 04, 2013 2:39 am
Profile
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14512
Location: Home sweet home!
See first page :-)

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Fri Jan 04, 2013 7:56 am
Profile WWW
LQFP144 - On Top Of The Game
User avatar

Joined: Tue Mar 02, 2010 2:33 pm
Posts: 1201
Location: Australia
Fred wrote:
See first page :-)


ROFL! Sorry I must've missed that!

Ah the TDA7293 IC! Nice!

EDIT: Is your reason for using such that you have this IC already? or availability? or cost? etc?

The reason I ask is that I am doing some Class D work for a customer at the moment and you can get very efficient Class D IC's also! (less heat than AB for 100W, etc, etc)


Fri Jan 04, 2013 1:37 pm
Profile
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14512
Location: Home sweet home!
I hate switchers for audio MUCH more than I hate them for power supplies in ECUs ;-)

Had three of them for months with intent to do just this.

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Fri Jan 04, 2013 5:12 pm
Profile WWW
LQFP144 - On Top Of The Game
User avatar

Joined: Tue Mar 02, 2010 2:33 pm
Posts: 1201
Location: Australia
LOL @ hatred for switchers! :-)

makes me smile for so many reasons!

skype in a day or so eh?

:-)


Sat Jan 05, 2013 11:37 am
Profile
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14512
Location: Home sweet home!
Skype complete! Skype again in ~24 hours :-)

Mean while, I cut the heatsink down to fit, and it's now 221mm long. So we have that much face for mounting boards to. I think the boards will purely be mounted to the heatsink, by IC and by some brackets. Each should be about 60 - 70mm wide for a bit of working space to be present for wiring, etc.

I need to cut some steel and plastic to get the heatsink into the part of the case that I want it. That and all of the other things on the list, too. Time to clean up the flat and do the dishes and some food shopping etc. Ahhhh chores.

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Sat Jan 05, 2013 2:30 pm
Profile WWW
LQFP144 - On Top Of The Game
User avatar

Joined: Thu Feb 25, 2010 3:57 am
Posts: 561
Location: Gosport, IN USA
There is a picture of the first draft schematic for one channel amplifier IC.
git hash: 36c6a7f95121be5c332cde25fbff0e4994004703


Attachments:
File comment: First draft of the schematic for the amplifier
Amplifier-Schematic.PNG
Amplifier-Schematic.PNG [ 32.86 KiB | Viewed 1665 times ]

_________________
Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com
Sun Feb 03, 2013 2:36 am
Profile WWW
LQFP144 - On Top Of The Game
User avatar

Joined: Thu Feb 25, 2010 3:57 am
Posts: 561
Location: Gosport, IN USA
github repository for the the amplifer PCB design:

https://github.com/DeuceEFI/Amplifier

git hash after adding the LICENSE.txt, TODO.md, README.md and Amplifier-Schematic.pdf files is: 3427d85e74e55b52c977fda8912b3612c0eaaec1

_________________
Andy.
FreeEMS vehicle #11, 1932 Ford 5 Window Coupe with a 1996 GM 3.1L SFI V6 with DIS ignition
FreeEMS vehicle #16, 1996 Chevrolet S10 2.2L SFI I4 with DIS ignition
http://www.coolefi.com


Sun Feb 03, 2013 3:02 am
Profile WWW
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14512
Location: Home sweet home!
I spy with my little eye a copy paste error in the readme ;-)

Haven't had a detailed look at the schem yet. I'll clone it in git and have a poke around.

Thanks! :-)

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Sun Feb 03, 2013 2:39 pm
Profile WWW
Moderator
User avatar

Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14512
Location: Home sweet home!
OK, I have it open in KiCAD and the basic layout looks good! I think. I'll recheck it when less tired, though.

Round one of minor changes:

  • Both 22uF caps are 100uF (C2 and C5)
  • Both upper and lower power supply have triple decouple + bulk (two missing caps per rail) (friends of C7 and C9)
  • The input cap (C1) is three 1uF caps in parallel, not one 0.47uF cap
  • The diode is 1N4007 (D1)
  • Standby and input grounds should be grouped as per PDF schematic (though yours is more clear! if we can maintain clarity, that'd be good!)

References:

http://stuff.fredcooke.com/TDA7293-AmpP ... icBase.png
http://stuff.fredcooke.com/TDA7293-AmpP ... otated.png (updated slightly to change maybes to yes/no)
http://stuff.fredcooke.com/amplifier.pr ... G_7001.JPG
viewtopic.php?p=30972#p30972

The vclip and input and mute/stby might need more stuff at some point, however I have no idea what, if anything, right now :-)

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Sun Feb 03, 2013 8:56 pm
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 67 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF. ColorizeIt.