For the 3 stage filter, here is the transient simulation with 200mVpp 50kHz triangle waveform signal from 20V DC with 100 milliohm source impedance. The filter has 7 ohm load ( gives same result for 100 ohm and 500 ohm load).
An externally hosted image should be here but it was not working when we last tested it.
Yes, one could cascade two of Mark's filters in series for a 4 stage filter, but acccording to him it is limited to 3A.
The above three stage filter could easily handle 6A, which was my main motivation for application on a TPA3251 or TPA3255 amplifier.
The above three stage filter could easily handle 6A, which was my main motivation for application on a TPA3251 or TPA3255 amplifier.
Not yet, waiting for the parts to arrive, which have been shipped.
These simulations assume the source power supply (SMPS) output impedance is around 0.1 ohms, which seems like a reasonable simulation guess for a 32V 5A power supply. I have been assuming the load can range from around 500 ohms to 7 ohms. The application is for a cheap PS driving the Aiyima 04. The PC board RLC parasitics in the simulation are an educated guess. I may go measure the SMPS output impedance, later.
I grabbed the datasheet of a fairly typical 150 watt SMPS, made by Mean Well, attached below. It says the output voltage's load regulation (0% to 100% of full rated load --- page 2 row 9) is plus or minus 0.5%. So on a 5A, 32V supply that'd be 0.16V, giving Zout = (0.16 volts / 5 amps) = 0.032 ohms. The entire 5A current path would need to be similarly low impedance, to avoid excess voltage sag.
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Yeah, I was considering using one of those cheap China laptop type SMPS, which is probably not well regulated. I will check it out to see, if the supply is really that good.
Simulation can only give an approximation of reality, but the SMPS source impedance change from 100 m-ohms to 32 m-ohms gives the same result. The true test is in measurement and results. 
It seems the image attachments must come from a hosted site URL. I tried drag and drop, but it seems corrupt the forum web page.
https://www.diyaudio.com/archive/gallery/index.htmlhttps://www.diyaudio.com/archive/gallery/index.html
"Please note: This is a permanent archive. Due to this gallery module becoming incompatible with the latest version of the forum software, we have frozen/archived all old galleries (and their images) and made them read-only. No new images can be uploaded, all old images are still accessible, all images and links to those images will still work, and this archive will remain permanently....."
It seems the image attachments must come from a hosted site URL. I tried drag and drop, but it seems corrupt the forum web page.
https://www.diyaudio.com/archive/gallery/index.htmlhttps://www.diyaudio.com/archive/gallery/index.html
"Please note: This is a permanent archive. Due to this gallery module becoming incompatible with the latest version of the forum software, we have frozen/archived all old galleries (and their images) and made them read-only. No new images can be uploaded, all old images are still accessible, all images and links to those images will still work, and this archive will remain permanently....."
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OK, I see. So you you need to use attachments (the paper clip) at the top.
I previously did not see the paper clip, since it was NOT next to image icon, where it belongs.
19mm of 0.1mm diameter copper wire give you 0,0406 ohm.
Round Wire Resistance Calculator
This DIY, right?
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Round Wire Resistance Calculator
This DIY, right?
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This is a re-post of the 3 stage filter from local image (not hosted elsewhere).
This is an experimental design 3 stage filter for 36V 6A application, one could use the 63V capacitor for 48V applications. Waiting for parts.
This is an experimental design 3 stage filter for 36V 6A application, one could use the 63V capacitor for 48V applications. Waiting for parts.
Attachments
Is it possible to edit the Gerber files to add some M3 mounting holes? I don't know how to do it...
Hi, everyone. I ordered 50 of these from JLPCB, for about $30 (so about 60 cents each), and am ready to distribute them to people who want them. Here's the deal: If you want one or two and are in the US, then they are free. If you want more than two or are not in the US, then I'll ask you to toss me a couple bucks to cover the costs and shipping. PM me if you want some.
Note also: Mouser BOM here for one click ordering. This does not include DC jacks, etc, as on the original BOM.
Note also: Mouser BOM here for one click ordering. This does not include DC jacks, etc, as on the original BOM.