ants
Full Member level 4
I have an audio transformer that is rated on the datasheet with primary at 3.2 ohms and secondary at 1.2Kohms. I use it at 100Khz and it works fine. The thing is how can I work out the power on the primary. I can't accurately measure current because my multimeter seems to change measured current by a lot, lets say 0.4A. So I can only accurately measure the voltage with my scope.
The inductances of the primary is 0.83mH and secondary 590mH. At 100KHz the primary should have an impedance of 500 ohms. At 10Khz it should be 50 ohms.
Which impedance do I use, the datasheet one? Or the 100KHz impedance one, which just seems too big.
Thanks.
The inductances of the primary is 0.83mH and secondary 590mH. At 100KHz the primary should have an impedance of 500 ohms. At 10Khz it should be 50 ohms.
Which impedance do I use, the datasheet one? Or the 100KHz impedance one, which just seems too big.
Thanks.