Matching FET's

[Dag Sundby]

Hello,

I'm brand new to this forum, but I've been lurkin' around here several times before. I know this question has been up earlier. I've built a simple MXR/DOD phase 45, and it's phasing. I'm now ready to get it to work for real.

How do I match those FET's? Is there a cuircuit I can build for measuring or something?
Which tecnical data for the FET is most important? (what should I look for in data sheets for different FET's)

I used two BF245A just for testing, and these work, but are not matched and of coarse the unit doesn't sound well. I know there should be 2N5953 or
2N5952 but I've not found them any place (I'm in Europe).

Any one?

Dag

[dai h.]

hi, check out R.G. Keen's GEO(gtr. efx. oriented site). IIRC there was something there about FET matching plus MXR Phaser-related information.

[Enzo]

And don't assume that any sound problems are caused by this potential mis-match. It is possible, but it could be totally unrelated.

[Dag Sundby]

Thanks a lot. I found the article that explains most of it.

Dag

[Dag Sundby]

Of coares not, but in this case it can't be very much else, I've got an original DOD to compare with.

Dag