UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Davewantsone · 1st Jan 2019, 7:16 pm

When using an ohmeter you are only measuring the D.C. resistance of the coil or winding. The coil will have an "ac" impedance "Z" which will consist or R and XL the inductive reactance which will vary with the frequency of the output voltage. for both the transformer and the speaker!

1st Jan 2019, 7:16 pm	#88
Davewantsone Hexode Join Date: Dec 2011 Location: Wigan, Greater Manchester, UK. Posts: 291	Re: More Chinese AM radio kits When using an ohmeter you are only measuring the D.C. resistance of the coil or winding. The coil will have an "ac" impedance "Z" which will consist or R and XL the inductive reactance which will vary with the frequency of the output voltage. for both the transformer and the speaker!