EMRFD Message Archive 5264

Message	Date	From	Subject
5264	2010-09-27 11:32:32	w4zcb	Ferrite cup cores
I have oodles of cup cores left over as a result of too close coupling with W1FB and Oak Hills Research. One size is 1-5/8 diameter and 1-1/4 inch tall. This one has a 2 mm gap in the center post to prevent saturation. There was a 100 Watt homebrew switcher in QST a number of years back that used this particular core. Measures 2.73 mH with the winding on its bobbin, varnished but readily broken apart with an overnight soaking in Acetone. The other one is 1-1/4 inches in diameter and 3/4 inch tall, and its center post does NOT have a gap. Also a winding on it's bobbin but again readily changed to whatever. The existing winding on both are about #20 copper and the material is 3C8. LC filters, VLF, switchers, the mind boggles. Probably well over 100 of each available, free to good home for shipping costs. Snail mail address and e-mail address OK on QRZ.com W4ZCB
5288	2010-09-28 13:41:21	w4zcb77	Re: Ferrite cup cores
Well, it appears that I had closer to two oodles of these. Despite filling several large orders, I have about 85 small cup cores left, and close to 100 of the large ones. It's going to take some more customers to keep the rest out of the landfill. W4ZCB > I have oodles of cup cores left over as a result of too close coupling > with W1FB and Oak Hills Research. > > One size is 1-5/8 diameter and 1-1/4 inch tall. This one has a 2 mm > gap in the center post to prevent saturation. There was a 100 Watt > homebrew switcher in QST a number of years back that used this > particular core. Measures 2.73 mH with the winding on its bobbin, > varnished but readily broken apart with an overnight soaking in > Acetone. > > The other one is 1-1/4 inches in diameter and 3/4 inch tall, and its > center post does NOT have a gap. Also a winding on it's bobbin but > again readily changed to whatever. The existing winding on both are > about #20 copper and the material is 3C8. > > LC filters, VLF, switchers, the mind boggles. > > Probably well over 100 of each available, free to good home for > shipping costs. Snail mail address and e-mail address OK on QRZ.com > > W4ZCB >
5289	2010-09-28 13:58:04	Derward Myrick	Re: Ferrite cup cores
I would like about 20 of each. Tell me what the shipping is. Derward Myrick KD5WWI 7978 Belle Helene Drive Denham Springs, LA 70726 ----- Original Message -----
5332	2010-10-03 08:52:06	w4zcb77	Re: Ferrite cup cores