Power filter choke?

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Re: Power filter choke?

Post by Admin on Sun Sep 17, 2017 7:47 pm

Hi Graham,
As Ivan says, that's a good idea.
Rather clever, in fact. These inductors are very common in most rubbish dumps and builders skips.

Thanks for the tip. BR Harry - EA/SM0VPO

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Re: Power filter choke?

Post by Ivan on Sat Sep 16, 2017 12:27 pm

Hi,
that's a good idea! Moreover, chokes can be connected into series so that their inductance adds.

BR from Ivan

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Power filter choke?

Post by GrahamH on Sat Sep 16, 2017 11:24 am

I recently acquired/scrounged two old 2*20W fluoro light fittings. By connecting a capacitor across the ballast and applying a variable frequency AF osc to find resonance I have calculated and inductance of around 3 1/2 Henrys. These may have application for filtering in valve power supplies. A low value for this purpose admittedly, but at only the cost of stripping the light fitting, a better result than using a resistor.

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