Lars Edwards, wrote regarding the K2 T-R Relay Driver Adapter PC Board:
Do you by any chance have a board and parts kit available and if so
what is the cost inc. shipping ?
Using appropriate components, this device should key just about any
T-R line presented by an external RF amplifier which must key +120VDC
or less at no more than 3A. This includes virtually all current
production HF amps, including the Heathkit SB220/SB-221 series of
amps.. though the Heath amps are NOT QSK-capable unless they have
been modified.
So far, I've only offered the PC board itself.. for $6 ppd to your mailbox.
Up to now, I've made the boards, in small quantities, in my kitchen,
using a photographic contact exposure technique which yields
excellent quality boards, BUT which were hand drilled. I had no way I
could (to my satisfaction) tin plate the copper side of the board.
Just yesterday, I sent an order to FAR Circuits, to have them make a
supply of PC boards which would be machine-drilled AND which will be
solder coated as well. I should have these new PC boards within 2 weeks.
In the past, because orders have been slow, and generally few, I've
supplied builders with a parts listing and component part numbers
from Mouser Electronics (www.mouser.com). However, I'm planning on
'kitting' the entire kit of parts, so builders will be able to order
a complete kit from me.
At this point, there are two models of the T-R driver circuit which
are available, one which uses two (2) 2N7000 MOSFET transistors, and
which is good to drive relays up to about 50VDC and around 200mA of
current, and a model which uses one 2N7000 for the input, but a
heavy-duty HEXFET (possibly an IRF610B) which will drive loads up to
about 200VDC and 3A current. ONLY THE HEAVY-DUTY driver will be
offered as a kit.
The complete kit would run about $16 each, postpaid to any US
destination... $1 (US) more to a DX location.
I'll still offer the bare PC boards for $6 ppd ($7 US to DX).
I should have complete kits available in 2-3 weeks, bare PC board
(hopefully) within 2 weeks.
If you wish to order a kit, please remit to:
Tom Hammond
5417 Scruggs Stn Rd
Lohman MO 65053
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