I have a W5XD keyer that I am not using and would like to sell. It has the
current optos and the current EPROM. It's in excellent condition and has
the external analog speed control. I'd like $150 plus shipping from AZ.
Jim N7US
-----Original Message-----
From: W. Wright, W5XD
Sent: Wednesday, October 06, 2004 5:16 AM
To: writelog@contesting.com
Cc: k5zd@charter.net
Subject: RE:[WriteLog] W5XD keyer question--PTT outputs not saturating.
After the very first production run of the keyer, the parts driving the PTT
outputs (and CW outputs for that matter) were replaced. Both were
photo-darlingtons, but the newer part was empirically shown to pull enough
current for the Yaesu rigs while the original part was not. I have forgotten
the exact serial number where the parts were switched over, but it was
something in the 130 to 150 range. (This all happened several years ago).
After opening the box, its easy to spot the ones with the old parts because
the original configuration was 4 by 4-pin DIP packages, part number
H11A817CQT, Each one drove one CW output or one PTT output. The new
configuration is 2 by 8 pin DP pages.
The new part, (the 8 pin one) is available from digikey: PS2501-2. It fits
in the same circuit board holes as the old one.
Wayne
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