29-12-2014, 02:35 AM
(28-12-2014, 07:07 PM)Ed_Dinning Wrote: Hi Gents, there have been Eddystone AC/DC sets manufactured as described above, with the chassis earthed and a "neutral" busbar insulated from chassis within the set. This busbar is linked to chassis and earth via a Y class capacitor.
It certainly can be done, but requires care and caution.
Ed
Thank you all for your input. I think that the effort to convert a chassis will be worthwhile if only to prove it is plausible.
I am assuming the capacitor between Neutral and earth is purely for RF suppression, in which case is there a case for a pi network of 1, X and 2, Y caps as used for motor suppression? That would take care of the modulation capacitor as well.
As I said, it is not for my safety but to establish that with modern components a better solution is available to the now frowned upon practice of 'live' chassis construction.
Agreed that the isolating transformer solution is good, but that seems to me like a patch rather than a cost effective design solution.
Boater Sam.
