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Scarface1 8th February 2017 06:16 PM

Do you know how. 3db is hearable. I think if you increase the volume by 6db its defenitily louder.

But it would be nice if i can get 20+20+40 watt out of it.

doctormord 8th February 2017 07:18 PM

I don't know your board, sorry.

Scarface1 8th February 2017 07:22 PM

Oke. I apriciate the time you taken. Hope someone else have an answer.

irribeo 9th February 2017 11:29 AM

Show foto of your maxamp20 or at least tell if gain is set to 29.5dB, then show foto of your 3116 ampboard or at least tell what 3116 ampboard you have and then maybe someone is able to tell you how to make them behave more equal.

Scarface1 9th February 2017 03:21 PM

Its the original i buy. Kistradio en Kratradio Specialist - Modules - Versterkers - MaxAmp 12V Class-D versterker met JST-PH connector

undefinedza 11th February 2017 12:49 PM

1 Attachment(s)
Hi all,

I'm building dual mono PBTL with the DUG-1 board (schematic attached). I'd like to correct set the master/slave configuration, so just wanted to check some parameters:

1) With 26db gain, the master board will have an R4/R5 (gain setting pair) of 100k/20k.
2) The slave board will have 75k/47k.

Does that check out?

Next, some more questions:

So the schematic incorrect lists R7 (SYNC pin resistor) as 47k - as this was incorrectly listed on the EVM schematic in revision C - and should be 4.7k as was corrected in revision D. C5, the other component relevant to master/slave clock sync is 47pF.

1) Should I populate R7 (with 4.7k) and C5 (with 47pF) on both the master and slave boards?
2) Would it be beneficial to twist the SYNC wire around a GND wire? The DUG PCB exposes both in J5, so this would be very easy. The boards already have a shared GND.

Thanks for all the help!

irribeo 11th February 2017 01:16 PM

r5 to gnd would be 20k and 75k.
There is 6cm distance to bridge for the wire, you can use shielded if you mind. One 4k7/47pF at either master or slave is needed, I would pick slave side, then you need a 0 ohm jumper for r7 master side.

undefinedza 11th February 2017 03:30 PM

Great, thanks irribeo! You've been really helpful :)

millstonemike 11th February 2017 04:31 PM

1 Attachment(s)

Originally Posted by Scarface1 (
My subwoofer is 4 ohm and my satelite 8 ohm.
I also have a maxamp20 amplifier that have 11.5 watt RMS with 12 volt and it goes 3 to 4 times harder than my tpa3116d2 2.1( with bluetooth is goes twice the volume).

I think i are really close with this measurement. It defenitily not goes loud.

What's the gain of the chip on the board. You can have a 24v PS with 4 ohm speakers. If you not putting in a high enough signal vis-s-vis the chips gain setting, you won;t get the power out. See my paper on this.

Attachment 598660

millstonemike 11th February 2017 10:03 PM

1 Attachment(s)
Attachment 598710

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