[chbot] 6809 Processors

[Helmut Walle]

Any rust on the transformer? Or elsewhere? Progressive corrosion is one 
way to get worsening interference problems, due to the non-linearities 
thus present on the corroding surfaces of affected metal parts. 
Essentially the underlying original metal part serves as receive / 
transmit antenna, while the rust or corrosion on the surface provides 
the non-linear properties that make it a modulator (if the effect is 
desired) or a noise generator (if the effect is undesired)...

Kind regards,

Helmut.


On 03/02/14 22:00, Marshland Engineering wrote:
> The power to the main display is a switch mode supply and I have 
> changed the caps.
> The mill is a 220 V 3 phase so it already runs through an isolation 
> transformer from 440V.
> As it has got worse over time I'm looking at what could be the cause.
>
> The TIG welder is switchmode, however it's not the weld that does it 
> but the high frequency spark at the start. The spark jumps 5-6 mm and 
> the mill goes awol even though its 6 meters away.  That reminded me, 
> I've been playing around with ignitions and was using the variable 
> speed in the mill to swing the rotors. As soon as the sparkplug fires, 
> the mill goes off.
>
> So it's the a tiny high voltage spike that get through. May not even 
> be through the mains.
>
> Cheers Wallace
>
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