From: Arjen Raateland, SYKE/YV, puh. 90-4030 0457 (Arjen.Raateland@vyh.fi)
My KC-1 from Wilderness Radio arrived a few days ago. No hurry to
assemble as I'm waiting for a Sierra from the same place.
On studying the documentation and reading the article by the designer
of the KC-1 in QRPp I noticed that the current version of the KC-1 has
done away with the divider IC (something like 74HC..20).
When I look at the PC board I wonder how a second IC ever might have
fitted, but there must be an other reason for not having the separate
divider IC ;-) The KC-1 certainly is a very smart design. I remember
that the designer mentioned in a message to this group that he had an
unused output on the PIC IC. In the kit I got there is an auxiliary
switching output for anything the user cares to switch. So thoughtful!
One would expect this to be a very succesful product.
I have a suggestion to make to anybody who builds the KC-1. The
regulator 78L05 takes about 4 mA of quiescent current. It could be
replaced by a similar regulator IC LP2950 that has only 75 microAmps
quiescent current, but similar maximum load current data as a 78L05.
Four milliamps is still a lot of current to waste if the total current
consumption of a rig is only 35 mA!
Unfortunately I haven't been able to get any LP2950's yet, but for
small CMOS circuits like the KC-1 they should be just the thing to
73 de OH2ZAZ
Suomen Ymp rist nkeskus / YV
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Finnish Environment Agency, Helsinki, Finland
tel. +358 0 4030 0457
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