Recent content by reson8r

I've gotten to the bottom of this, with some help from elsewhere. There is indeed a typo in eqn 3.1 -- Ipp should be ipp. And page 23 of the paper does touch on core loss dependency on D. Duty cycles away from 50% contain higher harmonic amplitudes, which contribute to higher core loss. That...

Check out "The Art of Electronics" by Horowitz and Hill. They've just issued a new edition. It's full of helpful and practical approaches to problems like this. It starts right at the beginner level but works right through things like transistor & FET biasing and reducing beta and gm...

I think "specific heat" might be more useful -- it's a measure of the amount of energy required to raise a substance a certain number of degrees. With power & time (energy) and specific heat you can determine how hot your object will get dissipating that power. For example, your real-world...

With only a 3.3 V power supply you won't get much power to the speaker, only about a quarter watt by the back of my envelope here. Try a larger supply (but don't blow up your UM66). It's kind of strange to be driving a speaker with the collector of a transistor, too -- assuming the UM66...

Power converted to heat in a component is always dissipated in an effective resistance in the component, so you can use P = I2R or V2/R to determine the power in watts from the current I through the resistance or the voltage V across it. A resistor is mostly resistance (duh), but real inductors...

Hello folks, I'm looking for a way to measure core loss in RF transformers and inductors. I found a PhD thesis here: https://vtechworks.lib.vt.edu/bitstream/handle/10919/19296/Mu_M_D_2013.pdf which looks like just the ticket, but I'm having trouble understanding key parts. I've tried...

I'm a new member with a specific question I'll soon post in Electrical Engineering, but I love Physics and this looks like a great site. Looking forward to it! Gerrit