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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st November 2006, 02:56 PM   #11
FastEddy is offline FastEddy  United States
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" ... The frequencies involved in SMPS and class D amplifiers, including parasitistics, are always below 100Mhz so their wavelenghts are way too large to interact with animal or human body cells. ..."

Fine, good even.

The point is not the human condition, but the other electronic systems in your area that may be effected ... Being more concerned about: "... broadcasting music, politics or just plain old noise & interference. (Reason: the RF noise could interfer with aircraft radio traffic = crash = FCC, FAA, FBI, CIA, NSA, Homeland, etc. ... like stink on poo poo.)"

(If I were really, really paranoid, I would have mentioned the military HF audio work using mixed signal audio noise to cause the Taliban to throw up on the battle field ... or the use of multiplexed ultra sound audio to kill cancer cells ... or the VLF radio harmonics that seem to interfer with the breeding cycle of whales ... or those new medical side scan digital ultra sound devices to make movies of your liver in action.)

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Old 1st November 2006, 10:38 PM   #12
Eva is offline Eva  Spain
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Originally posted by fredos
Eva...Just a quick question...You never feel the heat on a cool coil? If you play with fews Kw as you say, you have probably feel that starnge phenomene....Even with a 250-500Khz frequency...What I read in certification manual, is that maybe too the hight dV/dt of the squared wave that cause HF interference...

I have never experienced that up to the date. I use 50Khz and my coils are designed to leak as little magnetic flux as possible. I always use a loop antenna attached to an oscilloscope probe in order to check how much my circuits are leaking in each plane.

However, I have experienced other funny things like heavy gauge wires expanding and contracting or moving when 150A pulses are made to flow through them.
I use to feel like the small child in The Emperor's New Clothes tale
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