Comments on: Dual Gate MOSFET Investigations - Biasing

By: Ian G0OTO

Ian G0OTO — Wed, 09 Mar 2011 16:14:38 +0000

An excellent article. There always seems to be a lot more to articles that are technical reports of practical demonstrations rather than academic writeups. I have learned a lot more about mosfets from this article than 30 years of construction!
Well done.
73

By: Jason Milldrum

Jason Milldrum — Sun, 27 Feb 2011 22:20:55 +0000

Thanks very much Colin. If you want to see the dual-gate MOSFET in action, take a look at my postings on the Clackamas, my entry for the 2010 FDIM 72-Part Challenge.

By: Colin VK3KDF

Colin VK3KDF — Sat, 26 Feb 2011 11:39:13 +0000

Nice work Jason, thanks for the excellent report. You're right, there doesn't seem to be a lot of information on the basics of biasing these useful devices. It's a shame that leaded versions seem to have vanished, it doesn't encourage home brewing. Keep up the good work!

By: w4ni

w4ni — Sat, 31 Jan 2009 14:52:36 +0000

Nice writeup . I, too, got a pinch of bf998 from ke6f . Due to smt, spent a lot of time mounting a bunch on half-inch square pads with crosscut notches . Took some time to figure out that both gates do not respond to bias the same way . I put one in the standard colpitts jfet oscillator circuit seen in many arrl qrp books but tied both gates together for the test. It was weaker sounding than with the jfet on the rx but worked ok .