I arranged the elements on the ground plane
With the loop probe and the ground plane we measure 2 Volts peak to peak
With the contiguous wires, the amplitude is substantially lower
With the twisted by contrast the attenuation is really significant!
Indeed, the voltage is low (24 V), and the non-negligible intensity (0.4 A) contrary to previous experiments
This time without ground plane, little difference: low voltage and parasite of frequency rather 'low'
The peaks were nevertheless lower with the ground plane
We will put in place the most effective solution: muzzling the source! Absorb the reverse voltage surge ...
I will use a 'freewheel' diode, connected in reverse!
And start with a non-polarized capacitor in parallel
The commercial devices use varistors or a serial RC network, we will see in the course
I connected the capacitor
No parasitic impulse! No more visible disturbances!
I install the diode
Note that the sound on opening is damped and slower with the diode!
We have seen the relative slowness with the diode
The difference without the diode is blatant!
This is why the diode is not used in power!
The slow opening will lengthen the transition time and give the spark due to breakage which will quickly destroy the contacts!
The diode could cause destruction (ignition) or welding of contacts!