Microwave Transformers Times Two

[Starfire]

Microwave oven transformers usually have one leg strapped to ground ( Iron-Core ) which limits their potential somewhat. A trick to double the O/P voltage, is to run two of them with one fed with an antiphase mains I/P { connected the other way around -- the start winding of one and the end winding of the other connected together to the mains etc.} The high voltage O/P's are fed to two diodes operating as fullwave. The cores are strapped together and grounded. In this configuration the pair act as one in a fullwave rectification mode and produce a DC voltage two times the O/P of a single transformer. For the adventurious souls - you can try a bridge and produce a differential of four times { give or take } And for the lunatic's in the camp - add another two transformers in series with the first two - connecting the cores of the second set to the HV of the first { the cores of the second set are at the full HV potential of the first set. -- They are allowed to float at this HV and pray that the insulation holds out. } Needless to say the whole assembly must be contained in a insulated box. I have run such a configuration for weeks with out failure or breakdown and get 16Kv @ 150ma as a differential voltage with the centre at Ground Potential suitable HV precautions are manditory THIS CONFIGURATION WILL KILL.

[3l]

Two microwave transformer in series have been running with no fuss for six months now. They are in oil. They have been used daily during that period. I used hollow state diodes to make dc. 2x2 diode vacuum tubes for rectifiers with d cell batteries to run the filaments. I'm using another set of microwave transformers to build my 10 stage linac supply with a maximun of 120kv at roughly 12 ma. I used (20) 470 pf @ 30 kv caps to prevent premature failure and create a safety margin. Also it leaves some wiggle room for better power latter.

Keep on Fusing!
Larry Leins
Fusion Tech