Electronics > Projects, Designs, and Technical Stuff
Do I need shielded chokes for noise suppression
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coppercone2:
When I did superposition of the curves that were supplied to me with chokes/filters from their datasheets I got pretty close results actually (for tighter grade of test). My theoretical ended up working with a few minor tweaks and some help and it passed.

Check the stupid stuff like paint masking, chassis fit, tightness, washers, etc.

If you are just doing a PCB its different ,if you have a chassis its worth to bring a bag candidate filters and stuff to test.
Simon:
Radiated and conducted tests are carried out, we failed radiated.
nctnico:
In that case you'll need to figure out which wires carry the offending frequencies.
Simon:
Well I have some fans that are nasty little buggers and I control their speed based on the input to be constant (read tacho adjust speed input). They generate all of this noise being shitty little brush-less fans which I have recomended we don't use but despite being right on two accounts already they still won't listen. They are also not very durable so I am having to regulate the power supply to not exceed 28V (my infamous low dropout regulator/oscillator). I don't know if the noise simply passed through my voltage regulator or if that in turn oscillated with the fan supply line. My new regulator will have significant damping as a reaction time of 1ms is fine and I don't want it strumming away at 90MHz in time with something in the load and passing that out of the box.
T3sl4co1l:
It's.... fans?

Did you try ferrite beads on their leads?

Tim
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