
Assembly instructions for kit #6
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Insert bare ends of the jumper wire between the spring and plastic case to make a good
contact and hold them in place. This is how the jumper wire is actually used for 3 Volts
experiments (one end is disconnected and may serve as on/off switch):
18.Locate the base (B), collector (C) and emitter (E) leads on the transistor:
19.Follow these steps using the wiring diagram for Kit #6 on the next page. You may trim the
wires if necessary.
oIf you do not plan to use a heat sink you may glue the transistor with branded side
up to the board using a small drop of super glue.
oSolder one end of the remaining piece of hook-up wire to the collector of the
transistor.
oSolder the other end of that wire, the negative (black) wire of the battery holder,
and the wire that is connected to "ground" lead of the Hall effect switch together. It
is easier to solder this connection if you twist the wires together first.
oSolder the wire from the "output" lead of the Hall effect switch to the base of the
transistor.
oSolder the "supply" lead from the Hall effect switch to the positive (red) battery
holder wire.
oBefore soldering the electromagnet wires insert the batteries into the battery holder.
Briefly connect one of the electromagnet wires to the positive (red) battery holder
wire and the other electromagnet wire to the emitter as shown below. If the
electromagnet doesn’t repel the permanent magnets away, switch the wires.
oIf the motor works, remove the batteries and solder these wires.
oYou may tape the wires to the board using scotch tape.