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| winding my own inductors |
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| Simon:
I'm thinking of winding my own inductors, I don't need anything too specific so accuracy is not critical. how do I calculate roughly the resulting inductance ? bearing in mind with or without cores |
| Zero999:
There are plenty of formulae on Wikipedia. http://en.wikipedia.org/wiki/Inductor#Inductance_formula What, inductance, frequency? Laminated iron is good at very low frequencies <3kHz. Various iron powered cores are good for 3kHz to 30MHz, different materials are optimised for specific bands. Air core is better for very high frequencies, >30MHz. |
| Simon:
its just a rough power filter (yea again - you know what for) I've given up trying to buy them |
| Zero999:
As I said on the other forum, there shouldn't be any need for a filter, the inductance in the coil will smooth out any fluctuation in current, adding a chock will increase the losses and gain you nothing. |
| Simon:
a low pass LC filter will help reduce spikes as spikes are like high frequency (high speed) and the output will react slowly to the fast rising spikes on the input. please see attached EWB simulation, the spikes have been killed off by a mere 1mH coil and a 10 uF condenser |
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