Manual

Project 71 Bouncy Blur
Use two vertical snap wires (V1) and mount the white
LED (D6) on them so it will shine towards a wall, then
place the projector on the white LED. Mount the mirror
and its base on a spring, and orient the mirror so the
reflected image will shine towards a wall.
Turn on the slide switch (S1) and adjust the knob on
the projector to show an image on the wall. Give the
mirror a push so it bounces back and forth on the
spring, making the image bounce around on the wall.
The room should be very dark for best effects.
Project 72 Light-Controlled
Light Tunnel
Turn on the slide switch (S1) and vary the amount of room light shining
on the phototransistor (Q4). If the light on the phototransistor is bright
enough then some of the LEDs in the light tunnel (U30) may be on.
Now hold the white LED (D6) so it shines on the phototransistor. If you
hold D6 directly above Q4 and touch it then all the lights in the light
tunnel should be on.
The phototransistor uses light to
control electric current. There are a lot
of LEDs in the light tunnel, so the
phototransistor needs very bright light
on it to let through enough current
through to light up the light tunnel.
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