[Milsurplus] Design for a cheap 400Hz power supply

[J. Forster]

Gregory W. Moore wrote:

> Third is "mil-spec" and "avionics grade". This costs about 1000% more than the
> other two per unit. Comes with voluminous specification sheets and inspection
> records, and most definitely has an expiration date, usually of only about 2
> months, after which it must be discarded (ALL the RTV caulking and sealing in my
> home has been done with this grade ROTFL).
>
> The interesting thing is, of course, that all three grades come out of the same
> vat, at the same time, and only the tube is labeled differently.

I have to disagree with the business of mil-spec stuff. It really does not matter a
lot if your home's window leaks a bit. It does matter if the seals on a plane leak.
I built spacecraft payloads for a number of years and you absolutely must use the
most carefully  selected and QC'd stuff. I saw $55,000,000 in taxpayer money and
three years of my work go poof because of some wrong paint.

Would you fly in a plane held together with Home Depot glue? Not me.

-John