Fusor Forums

Impressive work; you are really setting the bar for a home made power supply for a fusor that most could build. Keep experimenting and posting - you've created a great thread.

Ordered a set of beefier cores and made new secondaries with 2000 turns of #30. Each secondary was wound while submerged in epoxy resin. The single stage multiplier circuits will employ 40kV rated 100mA diodes. Preliminary testing will begin in a few days.

The unmultiplied output in series (under load) could be high enough to operate a fusor with little to no issue. Testing on that aspect will happen later but first will be a reduction in multiplier capacitor value to 510pF. Those items are still on order so the original multiplier module will be employed until then.

Mark Rowley

Those are beefy cores! Wound under epoxy resin? Slow setup time I image? Arc proof if under oil for sure.\
Great effort!

Richard Hull

Where did you get the cores?

Hi Dennis,
Picked them up on Amazon a few months back. The seller recently more than doubled the price for a pair as they’re now almost $26 a set. Id look elsewhere for a better deal.

Mark Rowley

Quick update on this supply. The last iteration with the beefier cores did not operate as expected. The composition of the cores did not provide proper inductance so the system was reverted back to the original smaller cores.

The PSU was a true performer for the fusor it was designed to power.

Mark Rowley

What type cores did you try out?

-Matt

Being almost a year ago I no longer have the exact specs and they are no longer offered from the seller. The above pic indicates their size. Another issue was the spacing between the primary and secondary. Too close and I'd suspect it'd ultimately break down.

Regardless of all that, the smaller cores were/are the bees knees.

Mark Rowley

Good Morning,

Hope you are doing well. Hopefully, I am not asking something already on the fusor Q&A or elsewhere but could you provide the calculations conducted to design this power supply?

sincerely,
Yosef Herrera