[Elecraft] Notes to new K2 builders - Part 1

Fri Mar 12 09:57:08 2004

Just one thought on your grounded pan.......put a 1 megohm resistor in
series with the ground lead.  Otherwise if you encounter a problem with
something being hot (AC line hot), you won't electrocute yourself.  I =
have a
copper strap along the front of my bench that is grounded thru a 1 meg
resistor and has a contact for hooking up my ESD strap before the =
resistor,
so I'm always grounded with my arms on the bench.

Gregg R. Lengling, W9DHI, Retired
Administrator http://www.milwaukeehdtv.org
K2/100 S#3075 KX1 S# 57
Politics is the art of appearing candid and completely open, while
concealing as much as possible.   -States: The Bene Gesserit View
=20

-----Original Message-----
From: [email protected] =
[mailto:[email protected]]
On Behalf Of Bill Tippett
Sent: Friday, March 12, 2004 2:19 PM
To: [email protected]
Subject: [Elecraft] Notes to new K2 builders - Part 1

	I've completed the Control Board for #4119 and
noticed the following:

1.  I ended up with an extra 1N5817 diode, which is
supposedly D3, but page 15 says to install R22 (82k)
in its place.  Maybe R22 is installed for temporary
testing so I'll keep the D3 diode until after alignment.

2.  U1 is specified as NE602 or SA602 on page 19, but
the IC in my kit was SA612...hopefully equivalent.

3.  Just a couple of thoughts on ESD protection.  Radio
Shack has an ESD wrist strap for $4.95, and 5" X 5"
conductive foam pads for $1.29.  I borrowed a large flat
aluminum cookie sheet from my wife for a work surface,
connect it to earth ground, place two pads on the sheet
and clip my wrist strap to the aluminum sheet.  I always
make sure I'm grounded before handling any device, such
as transferring loose transistors from the kit bags.  Hopefully
no zaps since my soldering iron is supposedly ESD safe.

				73,  Bill  W4ZV

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