Eliminate SMPS Noise Without a Linear Power Supply
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- เผยแพร่เมื่อ 12 ก.ย. 2024
- Noise Nuke thread - www.superbesta...
Hammond 1457N1201EBK case - www.hammfg.com...
Hammond 155B - www.hammfg.com...
Nichicon 6800uF 63V - www.mouser.com...
Jacks - amzn.to/3KD43iB
Cable connectors - amzn.to/3Viadtv
Basically this is a 2nd order LC filter with a frequency of 30Hz. This also explains why the "wobble" of your linear source (which is either the mains frequency or twice the mains frequency) is still slightly visible.
If using plugs I would invest the few extra cents and install a fuse and an asymmetric TVS diode. The TVS diode will act as an reverse polarity and overvoltage protection and with overvoltage for too long will go short and protect the expensive capacitors and preventing the ElectroBoom effect.
Higher power caps yes, because there would also be a big inrush current.
Slow Blow fuse
@@Douglas_Blake_579 The SMPS already have a fuse. Done.
A traditional pi filter uses a capacitor on either side of the choke. It's more optimized because the choke has less 'work' to do and the overall capacitance is the same.
In a traditional PSU, yes. We are coming straight off the SMPS though, that already should have some capacitance on that end.
Yep I've built several similar for myself and friends but 8 amp and multiple outputs I run my DACs ,PreAmps,Tubes,CD players, Streamer.
Best Sound I've heard
A nice and simple solution, I was in the throws of making a linear supply, however I will have to try this. Apart from me replacing the barrel connectors with USB ones as my target DAC is an SMSL 5V device, I will probably add some clip on ceramic cores and a 0.1uf ceramic cap straight across the output jack. Those big electro"s and iron core inductor are great at low frequencies, but not so with very high frequencies.
for best results with the 0.1 put is as close as possible to the output jack, with the shortest leads, if one gets into radio and RF you soon learn this stuff.
@@Douglas_Blake_579 Yes, definitely not something to hang off a computers USB port, the DAC I speak of has a separate USB port just for power, so I will have to carefully choose the power supply to suit. Some supplies are more happy starting up into such a load as they ramp up, so maybe happy, as opposed to just shoving the cap box into an already powered up supply.
I've done something simular with a Raspberry Pi 400, so it could better handy a hard drive starting up, hanging off a USB port, without the cap I had all sorts of strange crashes etc.
I do agree I would not put directly on a ISB port on a computer or laptop, but a direct wall supplied power supply. That dead short will only be very quick, but a lower amp out will take more time to charge those caps.
@@Douglas_Blake_579 Build one, try it, and see if you can kill a power supply.
Very good. A couple of things. The case must be metal and continuous [no gaps]. The limit on voltage is limited by the voltage rating of the capacitors. A fuse might not be a bad thing to include.
Not really. You can make a case out of plastic. I don’t see why not. And yes, limited on voltage of the caps. I do mention this on the video. A fuse is fine, but most units running g DC don’t have a fuse. And then the rating will change depending on voltage and current draw. A fuse would only protect the power supply in case of a short.
5:38 I think someone else does not know what a choke is. i.e. you
Okay.
Who ate all the pies.......?
A: Piethagoras.