Version: 13. September 2004
31
[ ] C79 47nF 473 G2
[ ] C80 47nF 473 F2
[ ] R17 1,5K E5
[ ] R18 1,5K E5
[ ] R19 1,5K D/E5
[ x] R20 2k7 0805 SMD E4
[ x] R21 1k2 0805 SMD E4
[X] R22 10R 0805 SMD E3
[ x] R23 39R 0805 SMD E3/4
[ ] R24 1,5K F3
[ ] R25 1,5K D3
[ ] R26 47R D4
[ ] R27 2k7R D5
[ ] R28 1k2 D5
[ ] R29 1K D5
[X] R30 10R 0805 SMD D5
[ ] R31 39R D5
[ ] R32 100K D5
[ ] R33 1K C5
[ ] R52 1,2K FG/2
[ ] R53 330R FG/2
[ ] R54 depending on instrument F2 ( wire bridge is bargraph)
[ x] R55 1K 0805 SMD E4
[ ] P2 10K Piher PT6 lying F2
Winding instructions Transformer TR1
Now, after a pause, follows a new part.
The transformer Tr1 is wound on a double
hole („pig nose“)
core.
Put the pig nose
core in front of
you, so that the
holes pass from left
to right. Tr1 has a primary of 4 turns, and a se-
condary of 2 turns, to transform downwards. Like
the other diagrams for transformers, this drawing also contains a dot. This
is always the beginning of the winding (for coils too). Cut a 15 cm piece of
0.2 mm wire (AWG 32), and feed it through
the pig nose, as shown in the diagram. One
turn is done by going through one hole and
back through the other. Make three turns:
Through the upper hole going right (leave
and end of some 2 cm outside). Back through
the lower hole. One turn done.
Now go on: through the upper hole, back
through the lower. End of turn two. Don‘t
scratch the wire on the edge of the core! The lacquer is easily damaged.
Go on with turn 2 and the primary is done. This completes the primary, and
leaves us to do the secondary. To easy mounting, our developer has laid out
Tr1 so that the secondary leaves the core opposite to the primary.
Take a 10 cm piece of 0.2 mm wire
(AWG 32) and feed it carefully from
right to left through the upper hole
and back from left to right through
the lower hole. End of the first se-
condary winding. Two more and we are
finished!
Now the transformer
can be mounted. The
secondary goes to 3 and
4, the primary to point
1 and 2, as shown in
the layout.
[ ] Tr1 QRP double hole core F3/4
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