running RCAs by power

Dave, a magnetic field does not have to swing negative in order for it to collapse.  Indeed, if the current flow goes to zero, it collapses.  If the polarity swings negative, the field reverses polarity.  But "collapse" literally means it goes from some value to zero, and it will certainly do that in a DC circuit.  Faraday (and Maxwell) showed that anytime a magnetic field is moving in relation to a wire, an EMF is induced.  It does not matter the polarity.

The magnetic field change I am talking about is in the power cable for an amplifier, not in the signal cable.  This field change can be very radical as the amplifier draws more or less current, and this field is certainly more than sufficient to induce a voltage into adjacent wiring.

You are correct of course that the LARGEST contributors to EMI and other induction effects is more likely a noisy system (rippled DC, arcs and sparks in the alternator, other mechanical and magnetic devices, etc.) than from pure induction through magnetic field interaction.  But you cannot say it does not happen.  That was my only point: that it is certainly possible and in some cases very problematic.  Poorman's theory that it is a "misconception" is simply wrong.

Oh come, we'll give em each a glass room, Some wire, goggles, a big ol battery and a six month supply of Doritos. 

Then we just see who cracks first.  "or proves the theory first"  

Looking specifically at "There is NEVER a negative swing - required to cause a total collapse of the magnetic field, inducing the voltage on the secondary"

explain how an ignition coil (which is nothing but a step-up transformer) works in this situation.. and why diodes are used on relay coil leads.

Jim

haemphyst wrote: Tegpilot wrote: Oh come, we'll give em each a glass room, Some wire, goggles, a big ol battery and a six month supply of Doritos.  Then we just see who cracks first.  "or proves the theory first"   ...and I think he's talking about us, DYohn... you ready?

I'd rather work with you than against you, my friend.  We could cook up some pretty good Frankenstein monsters if we wanted too.  I see large open frame plasma drivers.....  and plenty of Doritos and jerky...