[Lowfer] Another power supply 'head scratcher'

[riese-k3djc at juno.com]

I have a bunch of oven transformers and used one in a HV supply 
in breaking down the ovens for the transformers I found that roughly
50/50
of them had one side of the transformer winding grounded internal to the
transformer. others you were able to isolate that winding end and use it
in a full wave circuit with out it being grounded to the frame. I never
bothered to check the circuit
but I can see how this could be wired like bill found,, sounds pretty
scary

FYI oven transformers do make good HV transformers with OK regulation
I have a matched pair and would use these in a bridge circuit with the
simulated center
tap grounded ,,,phased to act like one big transformer

But be careful as it aint 12 Volts your playing with

Bob K3DJC


> I happened to be looking at the HV circuitry that drives the 
> magnetron and noticed that the HV rectifier diode, instead of 
> returning to the neutral side of the line, connected to a lug that 
> was screwed onto the chassis of the oven. I began thinking about 
> what would happen if the safety ground (green wire) were to become 
> disconnected or if someone used a 2-wire extension cord along with a 
> cheater plug. I ohmed out the chasis and netraul lines and found no 
> connection between them. Next I discovered a schematic of the oven 
> glued underneath the metal U-shaped cover. The schematic showed the 
> neutral and ground connections as they should be: IE: the HV diode 
> returned to the neutral line rather than the chassis. 
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