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Class D Switching Power Amplifiers and Power D/A conversion

I AM D v200, Fx Audio d802, optimisation and TPA3116
I AM D v200, Fx Audio d802, optimisation and TPA3116
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Old 11th December 2018, 11:29 AM   #531
Hugh Jazz is offline Hugh Jazz  Taiwan
Join Date: Feb 2013
Depends on the amp, speakers and some might say source too. If you want a rule of thumb I'd say design for 60KHz and 6 ohm, but I'd never do this. If I wanted a universal filter, I'd start at either 10uH or 15uH and 0.47uF differential, depending on the speakers, and see how it sounds.

40KHz and hybrid makes a lot of sense to me. How does percussion sound?

Last edited by Hugh Jazz; 11th December 2018 at 11:40 AM.
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Old 11th December 2018, 12:10 PM   #532
chermann is offline chermann  Austria
diyAudio Member
Join Date: Jan 2017
Location: Vienna
Hi Hugh Jazz

i am not so experienced as you or others. i just follow the hint as described above. currently i am happy with the setup for 4 ohms.
i tried

7 and 1
7 and 0,68F
7 and 0,68 + CTL 0,033F - original opamp (TL072 or fake)
now i use 7H + 1 again with new OPA1602 or AD8599

percussions was never a problem. the KEF Q100 is a coax which sound pointed but partly hard....and very good for that price !
so for this speaker it would be make sense to cut of -3dB at 20kHZ...i will try if i have time to change amps and speakers...but not in this thread

but as jean paul decribed. china boards(amps) are.... cheap +cheap +cheap..
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Old 14th December 2018, 09:15 AM   #533
Hugh Jazz is offline Hugh Jazz  Taiwan
Join Date: Feb 2013
I changed the 12v and 3.3V regulators, added a 47uH inductor for the 3.3V, and replaced caps in the D802 - and am very impressed with the sound now - that Rojon tcxo is good but it needed better power. I also got rid of the blue LEDs behind the volume dial - tacky. A minor re-route of the red/yellow/black button wires too.

The LM2596 and its bits are gone and instead there is a 550kHz switcher set to 12.8V that is fitted with an LT3045 set to 12V with fast start up and Cset of 22uF. I removed the diode (D3) that feeds 12V to the 3.3V reg and fitted a 47uH inductor. The 3.3V LM317 and its bits were removed and replaced with another LT3045. I'm using a linear power supply for the amp. The three 470uF caps were replaced with 1000uF Pansonic FR 16V, Rubycon 1200uF ZLH 6.3V and 1500uF 6.3V ZLJ.

Not much else worth doing to this amp now but it does sound really good. I'm impressed and very pleased :-)

I opened up the V200 again and pulled the coils - they are 11uH on my meter. I'll order some 10uH, some KDS xo, and a PCM1803 and then get to work on that. Can it sound as good as the D802....?
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Last edited by Hugh Jazz; 14th December 2018 at 09:29 AM.
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Old 12th February 2019, 09:48 AM   #534
dublin78 is offline dublin78  United Kingdom
diyAudio Member
Join Date: Mar 2006
Location: Cheshire

Do you think that I could use an FX D802 to power some PA speakers? They would be very efficient - 99 or 100db sensitivity (1w 1M). Two way speakers with 15" + Compression driver. Either 8ohm or 4 ohm.

I wouldn't need it for serious party volumes, but mainly for background music outside. I'm thinking 24v battery power for a mobile solution.
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