--- Mike Monett <[email protected]> wrote: > From: Harvey Norris > Date: Wed, 21 May 2003 22:29:46 > > > PS check your prices for 9 miles of 23 gauge > wire, as that is what > > these coils employ. > > There is no need to pay catalog price. There are > plenty of surplus > electronics places that keep 50 lb rolls of > wire in the back > storeroom, because nobody wants them. A little > negotiation, and they > sometimes take what they can get to get rid of > it. It might not be > the same gauge, but this doesn't matter. Gauge does matter because a magnetic field is determined by amp-turns, so for a equal resistnace of wire, a smaller gauge gives more amp turns of magnetic field vs the source voltage input for both cases. Magnetic field is (roughly) equivalent to inductance, and also q factor proportionally speaking. > > Besides, there is no need for a 60 Henry choke and > miles of wire. A > 1 Henry would do exactly the same thing. The key > is the Q of the > circuit. I'm sure you understand that Q is roughly the ratio of inductive reactance to resistance,[X(L)/R] and that inductive reactance is proportional to the inductance L: but however L itself is not a linear relationship to the amount of winds, also determined by R. Using 60 times less inductance does not imply the same Q factor because of the non linear relationship of winds/vs inductance. > > It would be easy to increase the Q by using a > ferrite or good > quality iron core. By theory yes: but ideal vs real performances do not match theory at all. Iron cores simply do not resonate well. I agree that some ferrites may do somewhat better, but the ratio of predicted vs real performances is very vast. Even the air core coils I use suffer from this ideal vs real performance ratio problem. Resonant transformers are > often used in power > regulation applications. This would add the cost > of the core, and > reduce the amount of wire needed. > > But the fact remains. The circuit presents a > constant impedance > between the variac and the silver cell. > > A simple 5 cent resistor would do exactly the same > thing. Please explain how a "resistor" can have "impedance" which is strictly a quality of inductance? Best Regards HDN
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