Conrad Course material 10090 14 years and over 10090 Manual De Usuario
Los códigos de productos
10090
The Speaker
Take the speaker and look at it in detail. The font has a diaphragm. It can be carefully pushed
inward a little. If you tap your finger onto the diaphragm, you will hear a sound. This shows the
speaker principle: A diaphragm movement generates sound.
On the rear, there is a strong magnet. Inside, there is a hidden wire coil with two connections to the
contacts and soldered-on cables.
The diaphragm therefore can be moved by electrical power.
The learning package comprises a battery compartment for a single mignon cell. Insert a 1.5-V cell.
Briefly touch the wires to those of the speaker. There will be a crackling sound. The diaphragm
movement is hard to see, but can be felt with a finger. Depending on connection direction, the
diaphragm is pushed inward or outward by the current.
The speaker has a resistance of 8 Ohm (
Ω). A very new 1.5 V battery may actually have about 1.6 V.
Then a current of 0.2 A flows. The power taken up is 0.32 W, and therefore still below the permitted
threshold. In later experiments, a lot less power will be taken up, but even a few milliwatt will lead
to the speaker generating a good volume.
threshold. In later experiments, a lot less power will be taken up, but even a few milliwatt will lead
to the speaker generating a good volume.
The Pinboard
The entire radio is built on the experimenting pinboard step by step.
In the beginning, the board may be simply put on the table. This makes circuit conversion
particularly comfortable. Later, the PCB should be glued into the casing.
Insertion of components requires relatively high power. The connection wires therefore bend easily. It
is important that the wires are inserted precisely from the top. Tweezers or small pliers will help with
this. A wire is held as close to the pinboard as possible and pushed vertically down. This permits
insertion of even sensitive connection wires like the tin-plated ends of the battery compartment and
speaker without bending them.
Take out the battery and connect the battery compartment on the pinboard with the speaker. The
drawing shows the internal connections. When inserting the battery, you will hear the crackling
again. Take the battery from the battery compartment again after a brief test to protect it for the
following tests.
Use insulated jumper wire to connect the components. Some short pieces are needed for internal
connections; the long rest is later used as reception aerial of the radio.
Cut matching pieces with pliers or, if necessary, old scissors and strip the insulation for about 5 mm
at the ends. To strip the wire ends, it has proven helpful to cut in the insulation with a sharp knife.
Attention! Do not scratch the wire, or it will break easily in this position later.
connections; the long rest is later used as reception aerial of the radio.
Cut matching pieces with pliers or, if necessary, old scissors and strip the insulation for about 5 mm
at the ends. To strip the wire ends, it has proven helpful to cut in the insulation with a sharp knife.
Attention! Do not scratch the wire, or it will break easily in this position later.