{"id":6711,"date":"2013-03-16T23:11:14","date_gmt":"2013-03-17T06:11:14","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=6711"},"modified":"2013-03-18T17:47:34","modified_gmt":"2013-03-19T00:47:34","slug":"2013-03-16-tbd","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=6711","title":{"rendered":"2013-03-16 Inductor,Toroid, 470.0 uH,2.3 IDC,0.19 Ohm"},"content":{"rendered":"

I bought some Jameco inductors, among them was Jameco Part No. 371215<\/a>, which was a closeout sale of $.49 each.\u00a0 Their picture shows it as uncovered wire, but all of the ones I\u00a0 got had a black heat shrink tubing around the circumference.\u00a0 The wire diameter was 24 mils, or about 23 AWG when the enamel insulation is removed..<\/p>\n

I measured one and it was 475 uH.\u00a0 I cut off the HS tubing leaving the bare wires.\u00a0 The winding was more than one layer, so I started unwinding the turns, with the objective to leave a single layer that was at least 100 uH.\u00a0 I removed about a meter of wire and left a single layer.\u00a0 This layer was 64 turns, 0.078 ohm DC resistance, and measured 150 uH.<\/p>\n

The core was painted yellow with a white end.\u00a0 The core measured 0.81 inch O.D., 0.45 inch I.D., and 0.265 inch high.\u00a0 I believe this is an iron core, mainly because it has low permeability.\u00a0 I don’t remember ever seeing a ferrite core painted yellow.\u00a0 The data sheet said ferrite core, and the core is from Core Technology and is a TC80-26B.\u00a0 I could not find any information online for this company or product.\u00a0 I strongly suspect that they mistakenly put the word ferrite in the data sheet.\u00a0 I did find this at surplussales.com<\/a> which says that the Micrometals yellow-white iron powder core is 26 mix, which is consistent with the datasheet.<\/p>\n

The price seemed reasonable.\u00a0 The toroid is a bit large for a Joule Thief, but it’s easy to work with, and makes winding a second feedback winding easy.\u00a0 It could hold more turns and with two more windings could be used for a higher voltage DC to DC converter.<\/p>\n

Since it was a closeout sale, they may no longer stock these when they have sold out.\u00a0 However they have various similar inductors that look like they use the same core.\u00a0 For many experimenters a 220 uH, 330 uH or similar would be just as good for a JT, and it will probably have heavier wire, which keeps the DC resistance low.<\/p>\n

Another different inductor<\/p>\n

I also bought some of these inductors<\/a> in their closeout sale.\u00a0 These are larger than the first inductor, but the number of turns is less so the inductance is 180 uH.\u00a0 These also use the yellow – white core.\u00a0 The number of turns is 44, and the wire size is 35 mils or 20 AWG when the insulation is taken into account.<\/p>\n","protected":false},"excerpt":{"rendered":"

I bought some Jameco inductors, among them was Jameco Part No. 371215, which was a closeout sale of $.49 each.\u00a0 Their picture shows it as uncovered wire, but all of the ones I\u00a0 got had a black heat shrink tubing around the circumference.\u00a0 The wire diameter was 24 mils, or about 23 AWG when the <\/p>\n

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