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Class D Switching Power Amplifiers and Power D/A conversion

Is there a dual TPA3116 amp with the input gain of 20dB?
Is there a dual TPA3116 amp with the input gain of 20dB?
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Old 9th October 2019, 08:55 AM   #1
CowCat is offline CowCat
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Default Is there a dual TPA3116 amp with the input gain of 20dB?

It seems that Breeze Audio dual TPA3116 100W * 2 has its input gain set to 32dB which is too high.

I want a cheap dual TPA3116 amp with the input gain of 20dB.

Does anyone know such a thing?
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Old 9th October 2019, 09:22 AM   #2
FauxFrench is online now FauxFrench  France
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Quote:
Originally Posted by CowCat View Post
It seems that Breeze Audio dual TPA3116 100W * 2 has its input gain set to 32dB which is too high.

I want a cheap dual TPA3116 amp with the input gain of 20dB.

Does anyone know such a thing?
Yes, the TI datasheet, section 6.5, tells that it can be set to 20dB gain:
http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf
It is a matter of removing a two (SMD) resistors (one for each chip) on the "Breeze Audio" board.

Last edited by FauxFrench; 9th October 2019 at 09:25 AM.
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Old 9th October 2019, 09:36 AM   #3
CowCat is offline CowCat
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I'd like to avoid soldering and desoldering because I don't want to buy expensive soldering equipments for now.
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Old 9th October 2019, 09:39 AM   #4
jean-paul is offline jean-paul  Netherlands
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Then cut them with a very sharp knife. However, I would desolder the resistors with a cheap but good soldering iron. Or have it done by a fellow DIYer that has a soldering iron. Looks better and is more or less a guarantee for reliable operation.

Any TPA3116/8 board can be changed to 20 dB amplification.
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Last edited by jean-paul; 9th October 2019 at 09:41 AM.
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Old 9th October 2019, 10:47 AM   #5
CowCat is offline CowCat
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It would be cheaper and easier to buy FX1002A, TPA3251 amp, or TPA3255 amp.
FX1002A comes with DIP switches for input gain.

Last edited by CowCat; 9th October 2019 at 10:56 AM.
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Old 9th October 2019, 10:54 AM   #6
jean-paul is offline jean-paul  Netherlands
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You might need the soldering iron more often when doing audio stuff. In fact you can't do without.
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Old 9th October 2019, 10:57 AM   #7
CowCat is offline CowCat
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Quote:
Originally Posted by jean-paul View Post
You might need the soldering iron more often when doing audio stuff. In fact you can't do without.
In the future, I will probably purchase a proper set of soldering equipments for keyboards and amplifiers.
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