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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116D2 Amp
TPA3116D2 Amp
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Old 30th June 2020, 08:12 PM   #11521
FauxFrench is offline FauxFrench  France
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Join Date: Dec 2017
Location: The mountains, calm and quiet.
Quote:
Originally Posted by jemraid View Post
Hello FauxFrench,
....................................
Thinking that the volume with my 12V supply and 4 Ohm speakers might diminish with the 20dB gain, I was a bit concerned about doing it, I'm completely wrong I'm pleased to say, very loud indeed is about still about 1/3 rotation of the pot.
.................................................. .......................
I had a thought about the pot and the switch, I have large 17" x 12" x 2" (425 x 300 x 50) wooden boxes that I put my amps in and need to have inputs and outputs on the panels. If I were to turn the switch on, set the pot at full volume, take leads from under the board to, two pots and one switch would that work?

Cheers - Jem
Hi Jem,

How much power you can get out of an amplifier mainly depends on the supply voltage and the load impedance, not the gain. The less gain, the more signal amplitude you need at the input to have the same power at the output. You compensate with an increase of signal level at the input.

With a 12V supply and a 4 Ohm load, you can get around 20W at the output. It will be sufficient for much. If you want more output power in 4 Ohm, you simply increase the supply voltage. 19.5 Volt (standard lap-top charger) will give you 45W in 4 Ohm. 24V is the maximum (70W!).

You can use the wooden box. Put the board with the volume potentiometer inside, turn the board ON and adjust the potentiometer to a suitable input sensitivity level. You can then add an external power switch and external potentiometer(s) at the input. Use 4K7 potentiometer(s).

Regards, FF

Last edited by FauxFrench; 30th June 2020 at 08:16 PM.
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Old 1st July 2020, 06:59 AM   #11522
erikthegreek is offline erikthegreek
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Join Date: Jul 2016
Would fitting a separate power switch not introduce the possibility of a switch on/off 'pop', or is that dealt with on the amp board itself?
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Old 1st July 2020, 07:09 AM   #11523
FauxFrench is offline FauxFrench  France
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Join Date: Dec 2017
Location: The mountains, calm and quiet.
Without having checked the exact start-up circuit, I guess the ON/OFF switch integrated in the potentiometer just cuts/connects the supply power. I, myself, leave the potentiometer "ON" permanently and cut or connect the power to the power supply (power adapter). I hardly hear anything at power-ON or -OFF.
Of course: Turn the source ON before the amplifier board and turn the source OFF after the amplifier board. "Ca marche".
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Old 1st July 2020, 08:43 AM   #11524
erikthegreek is offline erikthegreek
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Join Date: Jul 2016
Thanks @FauxFrench, definitely seems to be a good choice of amplifier board.
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Old 1st July 2020, 09:05 AM   #11525
jemraid is offline jemraid  United Kingdom
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Join Date: Aug 2004
Location: NE Derbyshire
TPA3116D2 Amp
Hello FauxFrench,

Many thanks for the further information and advice I will order some 4K7 Pots today.

My CHP-70's will only take 18 Watts very suitable for low power.The first time I heard them was at Colin Topps house, he kindly invited me round to have a listen to his FH3's. The amplifier he used at the time was a 6 Watt valve jobbie, I must admit I was a bit concerned, but, concert level sound that filled his large room. The amplifier was not one of the 'soft' ones but proper Class A, bright, detailed and very fast. A bit like the TPA3116D2 :-)

Hello Erik,

I've just been into the garage to try the switch on the amp board, upon switching on ... nothing, upon switching off ... a tiny ptp that if I wasn't listening for it I wouldn't notice.

Cheers both - Jem
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Old 3rd July 2020, 09:06 PM   #11526
nrabbit is offline nrabbit
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Join Date: Jun 2020
Really happy with how this one sounds finally. Factory gain was set to 32db which also put some hiss in my speakers. Factory DC power caps were 10x Sanyo 470uf/35v

Currently using gain resistors:
R1: 10k
R2: open

Input cap: 2.2uf, unknown brand

Initially tried going up in size for DC caps (went to 4x 1500uf panasonic 63v) but the treble was bordering on shrill. Saw here that the datasheet recommended value is 220uf (TPA3116D2 Boards) and I had some leftover caps from my TPA3255 project so I put 5x 47uF 63v and it sounds just great now.

Powered by 19v / 3.5A laptop power supply
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Old Yesterday, 03:16 PM   #11527
Oreo61 is offline Oreo61
diyAudio Member
 
Join Date: Jul 2019
Default tpa3116 mods

I built this with two mono tpa3116 boards sourced from maker_usa on ebay. Powered by Erroll Garner! Actually a Mean well 24v 6.5A supply. Very happy with it, but curious about recommended mods for this board. Thanks!
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Old Today, 11:31 AM   #11528
eshamp is offline eshamp  United Kingdom
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Join Date: Mar 2019
I just built a halfinator with a TPA3116 mono board. Volume potentiometer on full but still not getting the most out of the speaker.

My power supply is 19.6v lifepo4.

With a laptop on full volume if I adjust input voltage I can go down to around 14.5v before I experience any clipping or distortion. On a smartphone the volume is much lower and even at 9v I don't experience any distortion.

Do people recommend a pre amp or replacing components in tpa3116, and if replacing, what components should I replace?

Thanks!
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Old Today, 12:03 PM   #11529
eshamp is offline eshamp  United Kingdom
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Join Date: Mar 2019
Click the image to open in full size.

My flavour of TPA3116 mono amp.
 

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