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26
Project 30
Suspended Raindrops
Build the circuit as shown. Connect the white LED (D6) to the red & black jumper
wires. Turn on the slide switch (S1). Go to a water faucet and adjust the faucet so
water is dripping at a steady rate. Dim the room lights and hold the white LED so
it shines on the dripping water. Try to set the lever on the adjustable resistor (RV)
so that the dipping water drops appear suspended in mid-air. You may need to
adjust the drip rate on the faucet to make this work. You may get better results if
you replace the 100kW resistor (R5) with the 5.1kW resistor (R3). Also, try setting
the strobe rate to minimum and adjusting the drip rate.
Faucet
Project 27
Turn on the slide switch (S1) and move the lever on the adjustable resistor (RV) to
change how fast the light in the color organ (U22) changes colors.
Here the color organ light
changes colors in sync
with the strobe IC (U23),
but at a much slower rate.
Use the preceding circuit but replace the 5.1kW resistor (R3) with the speaker
(SP). Now you also hear the sound change as you adjust the lever on RV.
Project 28 Audio Adjustable Color
Changer
Replace the speaker with one of the LEDs (D1, D6, or D8). The LED is a
strobe light, changing much faster than the LED in the color organ.
Project 29 Double Adjustable Strobe
Adjustable Color Changer
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