Elenco Upgrade Kit SC500 to SC750 - Manual (Page 33)

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Project #566
OBJECTIVE: To use the sun to flash lights in a repeating pattern.
Solar Periodic Lights
Project #568
OBJECTIVE: To use the sun to power an AM radio transmitter.
Solar AM Radio
Transmitter
You need an AM radio for this project. Place it next to your circuit and
tune the frequency to where no other station is transmitting.
Set the meter (M2) to the LOW (or 10mA) scale. With the slide switch
(S1) off, make sure you have enough light on the solar cell (B2) for the
meter to read 9 or higher. Turn on the slide switch and adjust the
variable capacitor (CV) for the best sound on the radio. Cover the
photoresistor (RP) to change the sound pattern.
Set the meter (M2) to the LOW (or 10mA) scale. With the slide switch
(S1) off, make sure you have enough light on the solar cell (B2) for the
meter to read 9 or higher. Now turn on the slide switch and the LED’s
(D1 & D2) will alternate being on and off.
OBJECTIVE: To use the sun to flash lights in a repeating pattern.
Solar Periodic Lights (II)
Project #567
Use the circuit in project #566, except remove the 3-snap between the
music (U1) and alarm (U2) IC’s (base grid locations C2-C4) and add a
2-snap between the music IC and the 100
Ω resistor (R1) (base grid
B4-C4). The circuit works the same way but the LED flashing patterns
are different.