QRPKits DC40A, Руководство пользователя

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2/14/2007 Page - 10
Group 2: Receiver front end:
NOTES:
C8:
the flat side of the trimmer goes towards the line on the
outline.
U2: Install the 16-pin socket at the U2 position. Be sure the
notch is positioned to match the notch shown on the board.
Then install U2 into the socket orienting the dot and notch.
T1:
Band Specific Transformer, See Page 5
Using the red wire and a red T37-2 core, wind the required number of turns for the band you
are building. Keep the turns snug and as close together as you can. This is the secondary
winding (SEC). Wind 5 turns of the green magnet wire in the space between the start and
finish of the secondary winding. This is the primary or link winding (LINK) You can overlap
these turns if there isn't enough room to make a single layer. Trim back the leads to about
1/4” and tin. Tinning can be done with a
HOT soldering iron. It helps to have a blob of solder
on the tip when you do this. Start at the wire end and move back toward the core. Insert the
two red wire leads into the holes labeled “SEC” on the diagram and the two green wires into the holes labeled
“LINK”. The two holes on the left (closest to the edge of the board), are both ground, so it doesn't matter if the SEC
and LINK wires on this end are crossed. Trim the T1 leads after they are soldered.
location value markings √
R26 10 ohms BRN/BLK/BLK
R12 22 K RED/RED/ORG
R28 100 K BRN/BLK/YEL
R27 470 ohms YEL/VIO/BRN
C3 .1 uF 104 Mono
C37 .1 uF 104 Mono
C26 .1 uF 104 Mono
C38 .001 uF 102 Mono or Disk
C39 .001 uF 102 Mono or Disk
C36 .001 uF 102 Mono or Disk
C7 Band
specific See page 5
C8 40p Yellow trimmer
Q10 2N3819 jfet
Q8 2N7000
U2 Socket 16-pin
Q7 2N7000
Q9 2N7000
U2 74HC4053
T3 See text
T1 Band
Specific See page 5