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Chip Amps Amplifiers based on integrated circuits

TDA7293 IC
TDA7293 IC
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Old 12th February 2019, 03:13 PM   #21
UltimateX86 is online now UltimateX86  France
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TDA7293 IC
Why not using transistor like LINN CHARKA ?
https://static.qobuz.com/info/IMG/jp...ificateurs.jpg

GB2405275A - A discrete transistor boost amplifier for an audio driver IC, wherein the boost amplifier is automatically activated at high output levels
- Google Patents


linn abandoned the parallel to use transistors
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Last edited by UltimateX86; 12th February 2019 at 03:19 PM.
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Old 12th February 2019, 03:27 PM   #22
UltimateX86 is online now UltimateX86  France
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TDA7293 IC
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Old 12th February 2019, 10:21 PM   #23
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by Kay Pirinha View Post
Daniel, is it possible to combine the »modular« approach with the »economic« approach in the TDA7293 datasheet? That means paralleling the output stages of two or more chips and arrange them in a class g/h (whatever it may be...) environment? Best regards!
I didn't find out. See the arrangement with 1000uF connected near small signal portion of the amp? Large signal support on a board that ought to be treated like small signal, says that it is a subwoofer amplifier... and I lost interest directly. Today, we use Class D for subwoofers, especially NXP's Class D (after you put on a real input circuit including 470R series to each input to lower crosstalk).

However, it was interesting to see the possibility of TDA7293 chips in slave mode working at up to +-50vdc (32+32vac transformer). So, a parallel output tube hybrid looks promising. Or, if you happen to have a driver chip handy. I haven't tested at that voltage, but TDA7293 in slave mode looks like bargain priced audio output fets.
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Old 22nd February 2019, 02:09 PM   #24
santitrucco is offline santitrucco  Argentina
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Friennnddsssss !!!!
I have a new module with TDA7293.

I have a little hum 60hz, in ONE channel..
Only little and only in one channel.
Whyyyyy ?

And i have 0.014 ac in these channel.
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Old 22nd February 2019, 02:13 PM   #25
santitrucco is offline santitrucco  Argentina
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Is not in one chassis , only in a wooden board.

could be this ?

would it serve a cable from ground on pcb to chassis or main transformer ?
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Old 22nd February 2019, 07:47 PM   #26
santitrucco is offline santitrucco  Argentina
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Old 22nd February 2019, 08:04 PM   #27
santitrucco is offline santitrucco  Argentina
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Please
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Old 22nd February 2019, 10:55 PM   #28
PRR is online now PRR  United States
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> only in a wooden board. could be this ?

Yes.
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Old 22nd February 2019, 11:06 PM   #29
santitrucco is offline santitrucco  Argentina
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I will Try
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Old 23rd February 2019, 01:10 AM   #30
santitrucco is offline santitrucco  Argentina
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the 60hz are still in one channel
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