The simple conjuring trick in Figure 1 is intended to provide some enjoyment
for the beginner in electronics or conjuring, and should take only an hour or
two to build.
Circuit diagram
The trick works as follows: a wand (with a magnet mounted in one end) must
pass in a 1-2-3 sequence over reed switches S4 to S6 before the bulb LP1 will
light. If the wand passes over reed switches S1, S2, or S3, the 1-2-3 sequence
will be reset (that is, cancelled). Or, if the bulb is already burning, the
activation of reed switches S1, S2, or S3 will extinguish it.
All the reed switches - S1 to S6 - are glued just beneath the surface of a 10
cm² box (Figure 2). A general purpose adhesive is suggested, so that
the reed switches may later be moved if necessary. The bulb, LP1, is mounted in
the centre of the box. A small PP3 9V battery may be used. The prototype box was
built using balsa wood.
The wand may be waved back and forth in various motions over the box, on
condition that it finally passes in the correct 1-2-3 sequence over S4 to S6 (at
which point LP1 will light). This should thoroughly confuse any onlooker and
make it virtually impossible for another person to repeat the correct motions
with the same wand. The wand may also be lifted just high enough over reed
switches S1 to S3 so as not to trigger them.
A 7.2V filament bulb, LP1, was used - instead of, say, a LED - so as not to
give the trick an "electronic" appearance.
The operation of the circuit is fairly simple. Three AND logic gates of a
4081 CMOS IC are employed, with gates IC1a to IC1c being configured as a
standard cascaded latch circuit. S1 to S3 serve as reset switches. The output at
pin 10 will only switch to logic high when reed switches S4 to S6 are closed in
sequence. Power transistor TR1 amplifies the output current to light bulb
LP1.
Instead of a wand, a small neobdymium (super-strength) magnet may be stuck to
one finger, and one's finger used in place of the wand.
In "stand-by" mode (with the bulb extinguished) the circuit will use very
little current. Therefore a switch is not included in the circuit (of course,
one may be added). The box may be opened and the battery simply clipped on or
off.
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Thanks for the info, it was really helpful. I'll surely visit back again later.
ReplyDeletePC Richards