I was in my local electronics store
searching for transistors to use
in the Jung multiloop topology amp
(such as implemented on the META42 board).

They did not have 2n5484 or 2n5486. These
are the devices Tangent mentions on his site.

They did have 2n5485 though, and I bought a few. Are these NPN's? Are
they
suitable for using as a current source?

Does it matter who manufactured the "2n5485"?? That is, is there a standard
for naming semiconductors?




( I also bought a Weller WES51 today. Nice station, but that blinking light is driving me nuts!)

Quote:



A quick search shows that the 2N5485 is a N-channel JFET like the 2N5484.

I used 2N5487 & 2N5489's in my amps though.

The 2N5484 through -6es are generic N-channel JFETs, made by several different companies. The only difference between them (as far as it matters in the META42) is the Idss range. The 2N5485s will have higher average Idss than 2N5484s, but not so high that it's a problem. Some chips even benefit more from the higher bias level possible with the -5s, so it may turn out to be a good thing. Or, maybe not -- some chips don't like that much bias. Try it and see.