Looking for a TPA3116D2 to play with, I have access to a few, some with OP amps, some with caps, ... it can be hard to navigate through the lot and quite easy to get lost!
Don't have much experience with class D amps, so turning to the "pros"
Here's a short list of some of the 2.1 boards available, in 50W+50W, +100W.
Don't have much experience with class D amps, so turning to the "pros"
Here's a short list of some of the 2.1 boards available, in 50W+50W, +100W.
Attachments
I believe TI specifies ferrite bead filter is within FCC (how is radiolaw where you live?) with twisted speakerwires till 1.5 or 2 meters. In Japan it is probably not legal, very strict laws there This board has FB on output, so no peaking outputfilter with any speakerload, also less distortion and better efficiency?? probably, if chip isn't tempted to become a radiotransmitter
This board has FB on output, so no peaking outputfilter with any speakerload, also less distortion and better efficiency?? probably, if chip isn't tempted to become a radiotransmitterCouldn't you simply put it in a metal case?
But cables have less resistance than thin copper layer on the PCB I guess (?)
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I believe TI specifies ferrite bead filter is within FCC (how is radiolaw where you live?) with twisted speakerwires till 1.5 or 2 meters. In Japan it is probably not legal, very strict laws there
Well, measuring the TPA3132D2 (Simililar to the 3116/3118) with only fb-filters transmits some "noise" but not that much to worry about.
(Measured at PVCC=20V with 8Ohm speaker at 0.7m speaker wire, HMS3010, HZ551 probe at 1m distance)
Amp on, idle:
Those "peaks" are just harmonics of the switching frequency, better seen here:
Amp off:
Amp on (idle):
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Yeah, initially I was thinking about that amp, but then I was afraid that it might not have enough juice for the 2 subwoofers it was gonna power, meaning these:
OmnesAudio SW 6.01 | DIY
I also heard then that these amps don't actually have a variable lowpass, just some kind of bass eq, and I was bummed. I really need the variable low-pass.
Now I am thinking a bit sideways... like buying 2 STA508 based amps and for one of them use a Low-pass filter, thus having a amp for Fullrange and one variable in a reasonable small package. Get one aluminium case wide enough for 2 STA amps and be done with it. Ah, the whole thing will probably be fed from a laptop brick, with ~150W total available, which I will not use, because the FR will be MarkAudio CHR-70 and coupled with those subs will never reach 150W. But it's good for the THD and headroom. And the low pass fed from something like this. Does it make sense?
OmnesAudio SW 6.01 | DIY
I also heard then that these amps don't actually have a variable lowpass, just some kind of bass eq, and I was bummed. I really need the variable low-pass.
Now I am thinking a bit sideways... like buying 2 STA508 based amps and for one of them use a Low-pass filter, thus having a amp for Fullrange and one variable in a reasonable small package. Get one aluminium case wide enough for 2 STA amps and be done with it. Ah, the whole thing will probably be fed from a laptop brick, with ~150W total available, which I will not use, because the FR will be MarkAudio CHR-70 and coupled with those subs will never reach 150W. But it's good for the THD and headroom. And the low pass fed from something like this. Does it make sense?
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