QRPKits DC40A Manual 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.
2/14/2007
location
R26
R12
R28
R27
C3
C37
C26
C38
C39
C36
C7
C8
Q10
Q8
U2
Q7
Q9
U2
T3
T1
Page - 10
value markings
10 ohms BRN/BLK/BLK
22 K RED/RED/ORG
100 K BRN/BLK/YEL
470 ohms YEL/VIO/BRN
.1 uF 104 Mono
.1 uF 104 Mono
.1 uF 104 Mono
.001 uF 102 Mono or Disk
.001 uF 102 Mono or Disk
.001 uF 102 Mono or Disk
Band See page 5
specific
40p Yellow trimmer
2N3819 jfet
2N7000
Socket 16-pin
2N7000
2N7000
74HC4053
See text
Band See page 5
Specific
√