Electronics > Beginners
Power supply ripple
JS:
Hey, not too shabby, 1/3rd of the amplitude is not a bad improvement! At 190MHz construction is everything, so with that same configuration and a better construction you can be getting closer. Note that the frequency is well over your scope BW so I'd expect them to be a bit higher than they look but the relation should be pretty much the same.
Also, if you probe at the load (which is what interests you) the amplitude might get even lower as the inductance of the wires between the supply and the load helps with that.
If you get around to build it with SMD components and a double sided clad let me know, I'd like to know the actual difference in that.
JS
JuanGg:
For now I think it is good enough, I will make a proper pcb with smd caps eventually. (And post the results here, for sure)
My scope BW is 50 MHz (so less than 1/3 of 190 MHz). Spikes should be really attenuated by the scope I suppose. I was surprised they even showed up.
I will try probing the load when I have time.
Thanks again.
JS:
It just has a filter at 50MHz, so some attenuation at 190MHz but you can unlock to move the filter up to 100MHz... No biggie, you should, specially if you are trying to measure such fast events in SMPS.
JS
JuanGg:
--- Quote ---It just has a filter at 50MHz, so some attenuation at 190MHz but you can unlock to move the filter up to 100MHz... No biggie, you should, specially if you are trying to measure such fast events in SMPS.
--- End quote ---
Will do that eventually.
The SMPS gave up a while ago, oppened it up and there were no clear faulty components, I don't want to mesh much with its insides anyway...
I have been running the DPS3005 module of a 15 V 1 A wall wart, which is not ideal, but it does the job for now.
I am thinking of building a linear supply with some transformers I have salvaged, have to do more research on that. I have build a dc load that will hopefully help me with that. (https://www.eevblog.com/forum/projects/arduino-based-electronic-load/)
cdev:
You should put a small fan pulling hot air out of your case as the case is likely to impede airflow through both the original power supply's ventilation holes and the DC-DC converter's heatsink somewhat.
Those DC-DC converters likely need every bit of heat sinking they have got to work. I would also put some vent holes on the bottom, and 'feet' on the case so air can flow upward through the fins, not just from the sides up.
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