WEBVTT

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I arranged the elements on the ground plane

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With the loop probe and the ground plane we measure 2 Volts peak to peak

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With the contiguous wires, the amplitude is substantially lower

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With the twisted by contrast the attenuation is really significant!

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Indeed, the voltage is low (24 V), and the non-negligible intensity (0.4 A) contrary to previous experiments

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This time without ground plane, little difference: low voltage and parasite of frequency rather 'low'

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The peaks were nevertheless lower with the ground plane

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We will put in place the most effective solution: muzzling the source! Absorb the reverse voltage surge ...

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I will use a 'freewheel' diode, connected in reverse!

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And start with a non-polarized capacitor in parallel

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The commercial devices use varistors or a serial RC network, we will see in the course

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I connected the capacitor

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No parasitic impulse! No more visible disturbances!

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I install the diode

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Note that the sound on opening is damped and slower with the diode!

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We have seen the relative slowness with the diode

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The difference without the diode is blatant!

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This is why the diode is not used in power!

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The slow opening will lengthen the transition time and give the spark due to breakage which will quickly destroy the contacts!

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The diode could cause destruction (ignition) or welding of contacts!