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Class D Switching Power Amplifiers and Power D/A conversion

Can the JAB2/JAB3 Gain be changed from 20db to 26db?
Can the JAB2/JAB3 Gain be changed from 20db to 26db?
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Old 11th October 2018, 03:23 PM   #1
mstang1988 is offline mstang1988  United States
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Default Can the JAB2/JAB3 Gain be changed from 20db to 26db?

I want to increase the gain on a jab2 from 20db to 26db. I don't have the boards or the layout yet given shipping from china. I'm not certain they will fit my usecase unless I can increase the gain.

I saw this post which describes removing resistors but not which ones and why.

Sure JAB2-50 and JAB3-100 issues (low volume, crosstalk, bad BT range)

On the 3116's/3118's boards I have seen removing the resistors dropped the gain to 20db. I don't see slots left open to add resistors back.
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Old 11th October 2018, 04:14 PM   #2
FauxFrench is offline FauxFrench  France
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I understand you haven't got the boards yet. How do you know they only have a 20dB gain? Most boards from out east are initially designed for around 30dB gain. Due to hiss, the TPA3118 boards are often reduced to 20dB.
Could you eventually give me a link to the technical specifications of the Sure boards?
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Old 11th October 2018, 08:36 PM   #3
mstang1988 is offline mstang1988  United States
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Quote:
Originally Posted by FauxFrench View Post
I understand you haven't got the boards yet. How do you know they only have a 20dB gain? Most boards from out east are initially designed for around 30dB gain. Due to hiss, the TPA3118 boards are often reduced to 20dB.
Could you eventually give me a link to the technical specifications of the Sure boards?
Sure Electronics' webstore 2 x 50 Watt 4 Ohm Class D Audio Amplifier with Bluetooth 4.0 APT-X - JAB2-50 (for Gaming Kiosks)

This is the link I have. I don't see a board layout on the page.
http://sure-electronics.net/JAB.pdf
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Old 11th October 2018, 09:36 PM   #4
FauxFrench is offline FauxFrench  France
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Quote:
Originally Posted by mstang1988 View Post
Thanks for the links.

The two amplifiers seem based on TPA3110 and TPA3116. Both these chips have adjustable gain. This means, you can set the gain to 26dB because also Sure had to set the gain with resistors. What the initial gain is set to I cannot see.
For the TPA3116 board you can remove the heatsink. Exactly which SMD resistors you have to change I cannot see. You will have to wait for the boards to arrive.
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