Elenco Snaptricity&reg - Manual (Page 73)

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Relay (II) Project #63
Educational Corner:
FOR ADVANCED USERS -
ADULT SUPERVISION RECOMMENDED
Electric Paths
This circuit is a variation of the preceding relay circuit.The
current through the electromagnet makes a magnetic field
that attracts the nut-snap, which breaks the circuit to the
lamp.
Switch Y turns on the circuit and switch X controls the
electromagnet. In part B, the lamp flashes briefly because
it turns on faster than the electromagnet.
Description
Part A: Set the left slide switch (“X”) to position C and the
right slide switch (“Y”) to position C. The lamp (L4) should
be on (if off, make sure the 4-snap is touching the lamp
snap at F4 without being snapped there).
Set the left slide switch (X) to position B to turn on the
electromagnet. This should raise the 4-snap slightly and
turn off the lamp (adjust the position of the grommet on
the rod if it does not). If you still can’t get it to work, rotate
the 1-snap at location D2 to the proper spring direction as
shown, this may make the 4-snap move more easily.
Part B: Keep the left switch (X) on B and flip the right
switch (Y) back and forth a few times, waiting a few
seconds in each position. When the right switch (Y) is set
to C, the lamp should come on for a few seconds, then turn
off automatically. This circuit requires precise adjustment; if
it doesn’t work then make sure the grommet and 4-snap
are positioned as described above and start over.
Operation
Build the circuit shown. Three 3-snaps are stacked
together at base grid location E4-E6. Snap the 4-snap onto
the 1-snap at D2, then place it so it lays on the snap at F4
(DO NOT SNAP IT ON). Place the nut-snap on the 4-snap
so it will be under the electromagnet (M3). This circuit
works best with new alkaline batteries.
Place the rubber grommet on the iron core rod and push
the rod into the electromagnet until it is just barely above
the nut-snap without touching it (0.025 inches).
Assembly
The electromagnet pulls the 4-snap up
to break the flow of electricity.
Note spring
direction of
1-snap