Derek: For test jigging, I always go with an air core if possible.
100 uH is #10 wire wound on a 6" diameter helix, 6" long, with about 32 turns. For a coil form, try an oatmeal can or a piece of PVC drain pipe. (That'll impress the customers!) My next choice would be a powdered iron toroid, with fairly low permeability (like <50). Depending on perm, core cross section and magnetic path length, you might find a 3" diameter core with 15 turns would be a good starting point. Time to go buy an old ESI 250 bridge on the surplus market, or like I did, get a Wavetek LCR55 DMM. It's a good cheap tool for all the reasonable values of L, C, R & freq. Finally, you could try a steel rod. Perm may be 400 to 1000. Wrap on ten or so turns and see what you get. (May get warm if that's 30 Amps at 400 Hz!) Ed :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price [email protected] Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) > -----Original Message----- > From: Derek Walton [SMTP:[email protected]] > Sent: Wednesday, October 06, 1999 4:43 PM > To: [email protected] > Subject: Inductor > > > Hi folks, > > I need a low cost inductor with the following specifications: > > 100 microhenry, 30 amp max., operating frequency range 150 to 250 kHz > max. > > The rest is open for grabs. An air-core, while cheap enough, is a little > large. So I'm thinking about a few turns of heavy wire on a bar. Any > suggestions of what this bar should be mad of? > > Thanks, > > Derek. > -- > Derek Walton > Owner > L. F. Research EMC Design and Test Facility > 12790 Route 76, > Poplar Grove, > IL 61065. > www.lfresearch.com > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
