will a mutli meter match fets?

[guilds100]

I want to build a phase 45 and noticed it requires matched 2n5952 fets. I have a meter thats reads hfe of transisters. I that the value that determines a match? I did find a circuit that will do this but figured I'd try this first.

[tskullt]

Hey guilds100,
   When I built mine, I socketed the fets and just swapped until I got a nice swooshing sound, not really scientific, but it worked just great.  I only swapped a couple before I got a good match...
m.

[WLTerry]

Guilds. Bipolar transistors (BJT's like 2N3904, 2N8088, etc) are not the same as JFET transistors, is a totally diffrent thing... Both ransistors can work in a same approach (gain amplifier) but BJT's are voltage driven and FET's are current driven... or something like that.

You need 4 matched FET's for a phaser... in this case the FET transistor works as a electronic variable resistor and there's a value in FET's called Vgs, which is gate-source cutoff voltage. This voltage is the one that causes the FET to cut off completely, that means no current flows. All four FET's must have the same Vgs, not 100% exactly, but the more equals, the better.

Your multimeter have hfe meter, that hfe value is only for bipolar transistors and indicates the amount of gain of a bipolar transistor. You need to build the matcher circuit in Geofex site, test a bunch of 2N5952 's and find quartets of transistors with similar Vgs values.