Recent content by PaulWDent

It's not the VA that needs to ne higher - it's voltage. Use a 240v winding for 120v if you want to operate far from saturation. It's volt-seconds per turn that determine the core magnetic field, not output current. Mains teansgormers sre designed with only 10% margin to saturation and it...

Then drive it with a unity gain op-amp! e.g This seems a very trivial problem Your 4 ohms can't be right. With no load on the secondary it would be much higher. I think you said the load at 120v was 5k ohms. So let's do a calculation: The power you need is 120^2 5000. That's 2.88 watts. You...

Of course it's not constant with time if there is an R in the circuit, dissipating the power. The energy will decay exponentially. It's only constant when R=0, as with electrons flying around an atom's nucleus, which forms an infinite Q lossless resonator. In a crystal, many such identical...

Better not to break the helix in the center. Either use a one or two turn coupling loop into 50 ohm coax - no balun needed or put a multi-turn coupling winding around the center, tune that with a capacitor and tap it to get whatever impedance you want 50/75/300 You will find the latter gives a...

I forgot to mention the pipe was 10' ling

I just wound a big helix. 47 turns of 2" wide adhesive aluminum tape on a 4" dia PVC pipe. Total length of tape 30 meters. A one turn coupling loop around the middle was coupled to an HP network analyzer which showed the lowest (half wave) resonance to be 17MHz. This is factor of 3.4 times...

As the filament approaches its final temperature, the radiation tends to equal the power input. That means the adiabatic assumption is not accurate, nor is it necessary. It is is just as easy to include the Stefan-law radiation in a time-step simulation as not.