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Old 24th March 2010, 10:01 AM   #1
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Default My parallel TDA7293

I made two parallel TDA7293 amp boards for driving bass drivers in my active 2-way system and the boards are working perfectly so I thought it would be good to share my project with the community. Maybe someone finds it useful.

My schematic is almost the same as in datasheet, except for some minor changes in component values. I increased the bootstrap capacitor to 68uF, and the feedback and input resistors to 88,7k / 2,7k. I meant to use 82k, but 88,7k was what I had at home so that's what I used. Slightly higher gain and probably noise, but amp is still dead silent even with my ear pressed to the speaker cone so I don't worry.
Pinout on TDA7293 is made by madman so single-sided board is difficult to draw, and in the end contains more jumpers between lines than lines . Once I made single-layer board for TDA's and it was a nightmare. So this one is made double sided.

I don't use pin5 clipping indicator because I don't need it and the mute/standby functions are connected directly to +Vs via resistor and capacitor just to provide protection from turn-on transients.

Finally I can get rid of my LM3886 amps. My old love TDA7293 sounds much sweeter to me
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File Type: zip Modular 2xTDA7293 amp.zip (213.9 KB, 827 views)
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Old 24th March 2010, 10:05 AM   #2
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Picture of the board

The heatsink on the amp is obviously too small and is not permanent, but just for testing.
The amp runs off +/-40V supply.
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File Type: jpg TDA7293 parallel amp.JPG (142.6 KB, 1207 views)

Last edited by Cro maniac; 24th March 2010 at 10:07 AM.
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Old 25th March 2010, 12:14 AM   #3
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Default Help with boards

Quote:
Originally Posted by Cro maniac View Post
I made two parallel TDA7293 amp boards for driving bass drivers in my active 2-way system and the boards are working perfectly so I thought it would be good to share my project with the community. Maybe someone finds it useful.

My schematic is almost the same as in datasheet, except for some minor changes in component values. I increased the bootstrap capacitor to 68uF, and the feedback and input resistors to 88,7k / 2,7k. I meant to use 82k, but 88,7k was what I had at home so that's what I used. Slightly higher gain and probably noise, but amp is still dead silent even with my ear pressed to the speaker cone so I don't worry.
Pinout on TDA7293 is made by madman so single-sided board is difficult to draw, and in the end contains more jumpers between lines than lines . Once I made single-layer board for TDA's and it was a nightmare. So this one is made double sided.

I don't use pin5 clipping indicator because I don't need it and the mute/standby functions are connected directly to +Vs via resistor and capacitor just to provide protection from turn-on transients.

Finally I can get rid of my LM3886 amps. My old love TDA7293 sounds much sweeter to me
I have been looking for a source of PCBs using parallel TDA7293s. There are not many out there that you can buy. I am not experienced in PCD design or I would try to make some myself.

Any chance of you making a batch of these and selling them?

-Charlie
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Old 25th March 2010, 03:39 AM   #4
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Hello CRO MANIAC ;how much power with 2 chip , at +/- 40v it's good at 4 ohm.
Good idea for a GB
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Old 25th March 2010, 10:49 AM   #5
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The TDA7293 is an interesting device... one I intend evaluating at some point.

Cro maniac... pin 10 (the mute pin) on my data sheet shows the pins for master and slave connected, but the PCB appears to show pin 10 floating on the slave.
Attached Images
File Type: jpg Circuit.JPG (25.0 KB, 1061 views)
File Type: jpg Pin10 a.JPG (25.3 KB, 1016 views)
File Type: jpg Pin 10 b.JPG (23.1 KB, 982 views)
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Old 25th March 2010, 05:18 PM   #6
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Charlie, I don't mind making few boards by myself, but those won't look nearly as good as the ones made by proffesionals. Mine sometimes have miniature dots and pits on copper. And the thinner lines tend to be uneven.
I could also ask local manufacturer for price if more people want those boards.

Praudio, at +/-40V supply output power would be about 150W @4 ohms at the onset of clipping.

Yes Mooly, the board pics in the datasheet are flawed. I used them only as a guidance with component arrangement on my PCB after few futile attempts to route the board with minimum jumper count by myself.
You should be looking at the schematic which is correct.
There are even some minor differences in schematic of modular application between older and newer datasheets. Older ones had inputs of slave chip connected to signal ground, and the newer have them connected to -Vs which is how I did it.
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Old 25th March 2010, 05:39 PM   #7
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For sub operation , i would rather have chosen an lme49810 chip (driver chip) plus discrete output devices.
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Old 25th March 2010, 06:04 PM   #8
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By bass in two way speaker I meant bass-midrange driver, not subwoofer.
I like the sound of TDA's, and the design with LME's would cost me more.

For my subwoofer I built class D amp. I wouldn't feel comfortable wasting energy with class AB for such powerful amp.
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Old 25th March 2010, 06:20 PM   #9
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I understand.
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Old 25th March 2010, 06:25 PM   #10
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Quote:
Originally Posted by Cro maniac View Post
By bass in two way speaker I meant bass-midrange driver, not subwoofer.
I like the sound of TDA's, and the design with LME's would cost me more.

For my subwoofer I built class D amp. I wouldn't feel comfortable wasting energy with class AB for such powerful amp.
You are right about sub: class D hard to beat ! but only for sub;
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