"DelphiDude" wrote in message
news
We have a bunch of perfectly good ethernet switches which have bad fans.
The problem is that the fans are 5 volt and the only power available in
the box is also 5 volts.

So far, the little 1&1/2 inch fans are not available anywhere that we can
find, but are an exact physical match for 12v CPU fans on older PCs, which
we have a ton of.

They take only a few mils to run.

Does anybody know of a dc to dc converter chip or a simple circuit that I
could mass produce to convert 5vdc to 12vdc? A voltage doubler maybe?

Thanks

DD

The LMC7660 should do the trick!