Hi.
I asked in another thread if such a configuration would be possible and in the meantime -waiting for the discussion to go on- I squeezed my neurons to the utmost and by copyng and pasting the schematics on the data sheet I came to a circuit that very likely will blow and set my house on fire. Or with a bit of luck will simply not work...
My knowledge doesn't go much beyond Ohm's law, I usually build loudspeakers and not electronic, yet exactly because I need something to tri-amp my forthcoming open baffle I decided to look at a chip-amp, and cheap-amp aswell, for the woofers.
Looking at the data sheet, it seems to me that the slave 7293 needs just the power supply and the connection to pin 11. So I basically connected the two tda pin by pin, with the exception of pins connected as requested for the modular functioning.
In the image you can see the result of so much thinking...
Can you please evaluate if the circuit makes some sense or not and if it has any possybility -with the modifications suggested by you- to work?
Thank you all.
I asked in another thread if such a configuration would be possible and in the meantime -waiting for the discussion to go on- I squeezed my neurons to the utmost and by copyng and pasting the schematics on the data sheet I came to a circuit that very likely will blow and set my house on fire. Or with a bit of luck will simply not work...
My knowledge doesn't go much beyond Ohm's law, I usually build loudspeakers and not electronic, yet exactly because I need something to tri-amp my forthcoming open baffle I decided to look at a chip-amp, and cheap-amp aswell, for the woofers.
Looking at the data sheet, it seems to me that the slave 7293 needs just the power supply and the connection to pin 11. So I basically connected the two tda pin by pin, with the exception of pins connected as requested for the modular functioning.
In the image you can see the result of so much thinking...
Can you please evaluate if the circuit makes some sense or not and if it has any possybility -with the modifications suggested by you- to work?
Thank you all.
Why such a complicated design if Ohms law is the best of what you know in electronics? If you do not want to drive any exotic loudspeakers the high efficiency-circuit of the datasheet works very well. So the first question is: what do you want the circuit to use for? If high quality home hifi is your goal and you do not need exessive hearing levels take a look at
https://www.diyaudio.com/community/threads/tda-7293-done-right.371174/
it describes the build of such an amp and several caveats. Also shown at the end of page 8 the idea for a high power version.
Referring to the idea of your circuit (without having checked all details) - it has a chance to work if built up correctly.
This site might be interesting for you too:
https://neurochrome.com/pages/taming-the-lm3886-chip-amplifier
Bernd
https://www.diyaudio.com/community/threads/tda-7293-done-right.371174/
it describes the build of such an amp and several caveats. Also shown at the end of page 8 the idea for a high power version.
Referring to the idea of your circuit (without having checked all details) - it has a chance to work if built up correctly.
This site might be interesting for you too:
https://neurochrome.com/pages/taming-the-lm3886-chip-amplifier
Bernd
Thank you for you answer.
I've planned to use about 150/200 W for the woofer section and I'm attracted by the dual supply design because of the efficiency. It seems also that with the tda7293 is simpler to achieve good power -given the modular feature- by "just" adding a second chip.
As for the efficiency, I tried some class D modules, but I didn't like them, so I'm searching for an alternative and the tda7293 looks interesting to me.
Why not take advantage of the high efficiency feature also in modular design, after all? Efficiency is always good...
I searched the forum, but it looks like no one thought to exploit the class g/h in modular design, so perhaps this idea may be interesting for the community too, it may be worth to think about such a design. For me at least it is.