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Old 17th November 2006, 10:11 AM   #1
Dr007 is offline Dr007  Romania
diyAudio Member
Join Date: Nov 2006
Unhappy Tda7293 or LM3886 Modular Application


I'm newbie in electronics...
I want to build power amplifier with 2xTDA7293 or 2x LM3886 in parallel configuration, but, after long search i did'nt find PCB (one layer) for these aplication; i found only schematics and/or PCB dual layer.
Except this i have one question more...
For TDA7293 i found 2 different datasheets.... please check links:



Witch one is the good one? For modular aplication there are some diferences regardin conection between pins 2.3.4 and V-/GND for Tda7293 "slave"

Can sombody help me?

My mail adress is:
gheorghe_topciov@yahoo.com or
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Old 17th November 2006, 12:21 PM   #2
ilimzn is offline ilimzn  Croatia
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Join Date: Feb 2005
Location: Zagreb
Both are correct, one is for the 7293 and the other for 7293V. Use the one for the chips you have!
The ST satasheet has a parallel application (2x7293) PCB in it.
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Old 17th November 2006, 06:51 PM   #3
Dr007 is offline Dr007  Romania
diyAudio Member
Join Date: Nov 2006
Default Tda7293 or LM3886 Modular Application

Ok, but they have different connections, both are correct?

I will check witch type are my TDA7293... i hope will work!
I just checked....
I have TDA7294V and....


TDA7293V is included.... in both file!!!!!!!
And here is my confusion...

first file(from ST) have connected pins 2,3,4 from slave to -Vs but second file have connected 2, 3 to GND and only pin 4 on -Vs

I read some discussion about, and some electronists burned some TDA7393 if all pins are connected to -Vs.... and i don't want to have this "bad luck"

Sta da radim, onda?
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Old 17th November 2006, 06:51 PM   #4
Dr007 is offline Dr007  Romania
diyAudio Member
Join Date: Nov 2006
Exclamation Tda7293 or LM3886 Modular Application

And, what i discovered more is:

file from www.st.com are from 2003, and second one if from 2000;

Hmm... i'm thinking on just one thing:

ST Microelectronics have changed(updated) schematic for TDA7293?

Or this is just one mistake? and the old file published is correct?
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