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"I just built one and out of curiosity decided to measure the inductance. I got 135mH but I'm sure that could vary a bit. I hope it takes care of my noise problem."

hey ghilliesnpr are you sure thats not micro henrys or nano henrys that you measured?

I had some round enclosed cores ( ceramic) kicking around so I wound a bobin with about 12 ft ( all I could fit inside the ceramics) of 14 gauge enameled wire & it only measures about .23 milihenrys.

I am going to try it later today or tomorrow & see if it helps, if it does I may wind another one & make up a T filter ( my intent is to use this coil as the centre of a PI filter btw)

So far I have found defective diodes in the alternator, had that rebuilt & its MUCH quieter but there is still an audible whine, tried several different ground points & methods with no appreciable results, it has been suggested that a new battery may help as well but this one is not showing signs of weakness

This is all to feed a stereo head (kenwood after market) that is just being used as a preamp to drive the stock amplifiers

Thanks for posting this project by the way, its great to see there are still hobbiests out there !

Cheers
Howard

<blockquote data-quote="slarty42" data-source="post: 357788" data-attributes="member: 24916">&quot;I just built one and out of curiosity decided to measure the inductance. I got 135mH but I&#039;m sure that could vary a bit. I hope it takes care of my noise problem.&quot;hey ghilliesnpr are you sure thats not micro henrys or nano henrys that you measured?I had some round enclosed cores ( ceramic) kicking around so I wound a bobin with about 12 ft ( all I could fit inside the ceramics) of 14 gauge enameled wire &amp; it only measures about .23 milihenrys.I am going to try it later today or tomorrow &amp; see if it helps, if it does I may wind another one &amp; make up a T filter ( my intent is to use this coil as the centre of a PI filter btw)So far I have found defective diodes in the alternator, had that rebuilt &amp; its MUCH quieter but there is still an audible whine, tried several different ground points &amp; methods with no appreciable results, it has been suggested that a new battery may help as well but this one is not showing signs of weakness This is all to feed a stereo head&nbsp; (kenwood after market) that is just being used as a preamp to drive the stock amplifiersThanks for posting this project by the way, its great to see there are still hobbiests out there !CheersHoward</blockquote>

[QUOTE="slarty42, post: 357788, member: 24916"] "I just built one and out of curiosity decided to measure the inductance. I got 135mH but I'm sure that could vary a bit. I hope it takes care of my noise problem." hey ghilliesnpr are you sure thats not micro henrys or nano henrys that you measured? I had some round enclosed cores ( ceramic) kicking around so I wound a bobin with about 12 ft ( all I could fit inside the ceramics) of 14 gauge enameled wire & it only measures about .23 milihenrys. I am going to try it later today or tomorrow & see if it helps, if it does I may wind another one & make up a T filter ( my intent is to use this coil as the centre of a PI filter btw) So far I have found defective diodes in the alternator, had that rebuilt & its MUCH quieter but there is still an audible whine, tried several different ground points & methods with no appreciable results, it has been suggested that a new battery may help as well but this one is not showing signs of weakness This is all to feed a stereo head (kenwood after market) that is just being used as a preamp to drive the stock amplifiers Thanks for posting this project by the way, its great to see there are still hobbiests out there ! Cheers Howard [/QUOTE]

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