Step 3
Experiment with the best place to put the
Logiblocs and the flashlight. Re-set the alarm by
pressing the BUTTON. Guard your room so that
no-one can get past without setting the alarm
off ! Why not fix it up using mirrors ?
❸
FLASH BACK
Step 1
Plug the Logiblocs together as shown.
Step 2
Connect the light bulb circuit to
the OUT terminals as shown
in Step 5 of the Door
Alarm (page 10).
Step 3
Cover the lens and the
bulb will shine.
Now bring the shining bulb close to the
lens until it is almost touching. See
what happens.
This is called feedback.
Try replacing the LIGHT SWITCH with the
IN and connect the jack plug wires directly to
the terminals of the OUT.
Remember to disconnect the BATTERY BOX
when you are not using the Logiblocs to save the
batteries !
17