Initial testing using the two-MOSFET circuit
(http://www.mmccs.com/mmarc/n0ss/k2_t-r_rly_drvr.pdf ) with two 2N7000s, but
with R3 removed, indicates that it is working fine, switching a load of about
50 mA at 12-13V. I left R2 in.
Thanks all for your comments.
73,
Steve VE3SMA
Thanks, Don. Good point re the input side...I guess I'm not used to having
plug-in boards in mind!
Yes, I was thinking of a pair of 2N7000s - they are fine for the current and
voltage I need to switch.
73,
Steve VE3SMA
__
I did a bit of a write-up when I added the keying circuit to my K2 (based on
the article on the Elecraft website), hopefully you find it
useful:http://www.mwrs.org.au/2014/04/20/elecraft-k2-amplifier-keying-circuit/
73, Matt VK2RQ
On Mon, May 16, 2016 at 7:03 AM -0700, "Steve Kavanagh via
Steve,
It is not a good idea to leave the gate of a MOSFET with no static drain
on it.
When the board is removed from the K2 the gate at the input is exposed -
thus the 100k
The 100k between the 2 devices might be omitted if you wish.
The first link you mentioned is Eric Swartz work - the
I'm planning to add an external amplifier/transverter keying circuit to one of
my K2s. I found two versions on the web, both apparently designed by N0SS
(SK). The one on the Elecraft site
(http://www.elecraft.com/Apps/Amp_keying_ckt.htm ) appears to be his original
circuit, using a 2N7000
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