There are class D amps which have too small inductivities on the output.
They work but I wonder why not adding DIY a proper working filter.
How should it be dimensioned?
Example for weak filtering is CS8673 amps like ZK MT21 or ZK MT502 (I posted threads on them).
https://www.diyaudio.com/community/threads/unboxing-zk-mt21-tpa3116.403857/post-7699788
They work but I wonder why not adding DIY a proper working filter.
How should it be dimensioned?
Example for weak filtering is CS8673 amps like ZK MT21 or ZK MT502 (I posted threads on them).
https://www.diyaudio.com/community/threads/unboxing-zk-mt21-tpa3116.403857/post-7699788
Tiny inductors may increase rf-ripple as well as audible distortion.
What exactly is your concern?
What exactly is your concern?
Ready made class D amps with weak output filtering can suffer from a loss in efficiency?
Wonder if a filter can be added to remedy this.
Wonder if a filter can be added to remedy this.
Yes, in case you have a "filterless module" without inductors.
This will reduce rf-ripple, add some THD and affect the frequency response in the upper region.
This will reduce rf-ripple, add some THD and affect the frequency response in the upper region.
cs8673 chip has only weak filtering and someone measured it showing hf noise behaviour
thats what the datasheet shows
here the video
https://www.diyaudio.com/community/threads/unboxing-zk-mt21-tpa3116.403857/post-7699788
twisting cables would help?
thats what the datasheet shows
here the video
https://www.diyaudio.com/community/threads/unboxing-zk-mt21-tpa3116.403857/post-7699788
twisting cables would help?
Slight miscommunication as I thought that this was referring to the output side. What you may find, is that it's not so much the total capacitance that is most important, but the minimum ESR, and the 1uF + 10uF may actually ending up doing more filtering than the 220uF at the high switching frequencies involved.
With ceramics a voltage rating at least double the supply could be useful. Capacitance often plummets if the supply voltage is too close to the rating.
With ceramics a voltage rating at least double the supply could be useful. Capacitance often plummets if the supply voltage is too close to the rating.
The output shows the normal LC-filter output.
Significant rf output ripple is normal here.
Additional filtering is pointless.
Significant rf output ripple is normal here.
Additional filtering is pointless.
