[apowers]

watt-a-mezz
On the diagram of the bonn charger you rewind the core and bring out taps.
The end you start with is #1 it comes ac hot. the other taps should give different
voltage. any one of those taps you choose goes into rectifier ac. The neutral ac
from the mains goes into the other ac on rectifier. The switch between the inductor
and rectifier lets you toggle or select a different tap. Like I said I did not get any difference in voltage from different taps. (must have done something wrong)
Alvin
edit : If you are using a microwave transformer. Do not hook power to it
as is, those things output 2000 volts and will kill you.