QRP PROJECT Blue Cool Radio, Руководство пользователя

Страница: 9 / 45

Rev:Nobember 20. 2006
9
Group 3 AF Section
There are only a few parts in Section 3. It represents the AF Amplifier for
both, the received Signals and the TX-sidetone. The AF Amplifier is designed
to drive standard low impedance stereo headphones. Loudness of the
sidetone can be adjusted independent from receiver loudness by trimmpot
P4.
Start with installation of IC3 because it´s easier to be installed if space
around is free of other parts.
[ ] IC3 LM386
B-3/4
[ ] C41 10nF Foile spaced 5mm B-4
[ ] R28 10K upright B-4
[ ] C44 10 u F 35V rad. B-4
[ ] C40 100
u
F 16V rad. B-3/4
[ ] C43 47nF (473) B-3
[ ] C36 220nF Foil spaced 5mm
C-3/4
[ ] R29 4,7R upright B-3
[ ] C42 100
u F rad. B-3
[ ] R26 120R upright
C-3
Install fullowing diode
also upright. There is a
convention to place
the cathode (banded
side) to th eupper end.
The body is placed inside the printed
circle in the placement plan.
[ ] D11 1N4148
B/C-2/3
[ ] R27 100K upright B-3
[ ] C37 1uF rad B-2/3
[ X] C38 4,7nF SMD 0805 bottom of
PCB
[ X] C39 4,7nF SMD 0805 bottom of
PCB
[ ] R23 270R upright
A/B-3/4
[ ] Bu2 3,5mm Stereo Jack A-2/3
[ ] P3 10K Potentiometer SMC-10-V
B/C-4
[ ] P4 10K PT6 Trimmpoti C-3
Remember ESD safety rules if you
install th etransistor!!
[ ] T8 BS170 B-3
[ ] S1 Toggle Switch 2xUm A-3/4
If you again have checked your Work with a magnifier to find possible shorts
and forgotten solder points, you need a headphone and a key to test this
group. If you use a paddle, it must have a 3,5mm Stereo plug with
following connections: Paddle: Tip = Dot, Ring = Dash, Back = Ground.
Handkey (Pumpkey) : Tip and Ground,don´t connect the ring. Switch power