Relationship Between Inductance And Current In Filter Choke - diyAudio
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Old 6th December 2006, 07:09 AM   #1
mark845 is offline mark845  United States
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Default Relationship Between Inductance And Current In Filter Choke

I am making a power supply for a preamplifier. I need a 40 H choke at about 7-9 mA; however I cannot find chokes rated at this low milliamp range. Is there a mathematical or emperical relationship between choke inductance and current so that a choke rated for a greater current can be equally used? If so, what is the formula? I am aware that two 20 H chokes could be used, but I prefer to use a single choke.

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Old 6th December 2006, 07:18 AM   #2
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Rectifier Applications Handbook.

Answers all those sorts of questions. However, if all you're pulling is a few mA, then you don't need a choke input filter anyway. With such a low current, a capacitor filter, either with just the "C" or a CRC will work just fine, won't take up so much space, and won't be so . $$$$$
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Old 6th December 2006, 11:58 AM   #3
SY is offline SY  United States
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If you're willing to drive up to Benicia, I've got a few extra chokes at just about that rating and would be glad to donate one.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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