Dual Gate Mosfets (more)

wb5mmb wb5mmb at pobox.com
Mon Nov 5 09:17:41 CST 2012

Just put leads on them. http://www.hamelectronicsmagazine.com/dgmosmod.html

At 07:24 AM 11/5/2012, Gerald Wolczanski wrote:
>See (from the QRP-l forum GD3YEO):
>I have been reading all the responses to my request for a 40673 and am
>overwhelmed. I had determined from all the responses including yours
>that the BF998 was what I wanted. I then looked at SMT to conventional
>leaded part solutions and came up with an adapter board of sorts from
>Capital Advanced Technologies which is handled by Digikey. This little
>adapter board adapts the SOT143 package to a SIP package and they only
>cost less than $1.50 ea in single quanity. The BF998 are 14 cents each
>Another ham just suggests flipping the BF998 upside down and bending the
>Most posters suggests the BF998 is actually BETTER than the 40673.
>W7ZOi suggests that when the MOSFET mixer is implemented properly, it
>can offer very good performance.  It would certainly run rings around
>the NE602 family of devices, which ought to be outlawed IMHO.
>On Sun, 2012-11-04 at 20:35 -0700, Joseph Bento wrote:
> > When did dual gate mosfets such as the 40673 or 3N211 enter the
> > unobtanium category?  I managed to find a source tonight for a few at
> > reasonable prices - $3.00ea, but these are parts that used to sell for
> > pennies.  Now it seems they are going the way of tunnel diodes,
> > germanium transistors, and other semiconductors of old.
> >
> > I always found a dual gate mosfet to be a simple way to cobble together
> > a quick mixer.  Guess I'm going to have to learn new methods.
> >
> > Joe, N6DGY
> >
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