Project 47 hypnotic discs, Project 48 strobe light with music – Elenco Snap Circuits Motion User Manual
Page 34
Project 47
Hypnotic Discs
Use the preceding circuit (Fast Merry-Go-Round
with Music & Light), but remove the cardboard
figures from the merry-go-round base and install
one of the colored discs into the base. Watch the
hypnotic patterns on the discs as they spin.
If the color LED flash rate is synchronized with the disc rotation speed, it can appear
to “freeze” parts of the spinning disc pattern. Also, as different colors flash, those
colors can seem to disappear.
More about this in project 54, which uses gears to spin the disc faster and has
adjustable speed, but does not have music.
The 1mF capacitor is used to filter the voltage to the color LED. Without it, electrical
disturbances from the speaker and geared motor would disrupt the color LED’s
flashing pattern.
-33-
Hold color LED (D8)
over disc as shown.
Tab
Slide tabs into slots.
Tab
Tab
With this disc, the white
lines are often visible
despite spinning so fast,
and
some
colors
sometimes seem to
disappear.
When red flashes on the
LED, the red spiral
pattern
seems
to
disappear. This pattern
can seem hypnotizing.
With this disc, some
colors seem to disappear
at times.
Here are some effects to watch for:
This pattern can seem
hypnotizing.
Modify the preceding circuit to be this one; which has the color LED (D8) connected
with the red & black jumper wires, and the 1mF capacitor (C7) placed where the
color LED had been. Install one of the colored discs into the merry-go-round base.
For best effects, do this in a dimly lit room. Turn on the slide switch (S1). Hold the
color LED upside down over the merry-go-round base so it shines on the spinning
disc.
Observe the effects as the color LED flashes on the disc as it spins. Try it with
different discs.
Variants: You can change the sound by removing the 1-snap and 2-snap wires that
are at point A, or by moving them to be across points B & C, or across points A & D.
Project 48
Strobe Light with Music
Tab
Slide tabs into slots.
Tab
Tab
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