Conrad Course material 10090 14 years and over 10090 Manual De Usuario
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10090
Casing Assembly
All previous experiments were performed in the open setup. Now everything is installed in the casing.
This will get you closer to a proper radio. Stability and operability improve. Experiments and changes
continue to be possible because the casing can be opened comfortably with its magnetic closure.
Install the speaker by pushing it into the matching slot. The connections should point down so that
short connections lead to the board later. The speaker is sufficiently tight in the intended slot. You
may, however, apply an additional drop of glue or hot glue.
Place the extension axis onto the variable capacitator and screw it on with the long 2.5 mm screw.
Do not turn the axis too hard against the stop and use pliers to maintain the axis. The variable
capacitator is installed in the casing only later using two small screws and the matching washers.
The variable capacitator has a medium wave side with twice 280 pF and an ultra-short-wave side
with twice 20 pF. Additionally, each segment has a small trimming capacitator with approx. 20 pF
each that can be adjusted with a screwdriver.
The two trimmers have their own terminal lugs on the medium wave side. Including the ground
connection in the middle, this side therefore has five connections. The variable capacitator is
connected to the pinboard with a double screw terminal. Use the ground connection and the two
right connections (variable capacitator and trimmer), which should be screwed in together.
The pinboard must be installed in just the right position. It has a double-sided adhesive film on the
bottom. Screw the variable capacitator connections on and plug the screw terminal into the correct
position of the pinboard as a test. If everything is fitting, pull the protective film from the adhesive
side and push the pinboard firmly in position. As compared to the previous experiments, all
components now have to be placed a little differently. For reasons of space, the battery is placed on
the right side. The battery connection wires are equipped with a tension relief because the battery
compartment is lying loosely in the casing. The speaker wires do not have to be secured because it is
installed stationarily.