Elenco Upgrade Kit SC100 to SC750 - Manual (Page 157)

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This AM radio circuit uses a transistor (Q2) in the amplifier that drives
the speaker (SP). Turn on the slide switch (S1) and adjust the variable
capacitor (CV) for a radio station, then adjust the loudness using the
adjustable resistor (RV).
Project #527
OBJECTIVE: To show the output of an AM radio.
Transistor AM Radio
Project #528
OBJECTIVE: To learn about solar power.
Adjustable Solar
Power Meter
Set the adjustable resistor (RV) for mid-range and the meter (M2) for
the LOW (or 10mA) setting. Turn on the slide switch (S1) and let light
shine on the solar cell (B2). Move the solar cell around different light
sources and adjust the adjustable resistor to change the reading on
the meter.
Place your hand to cover half of the solar cell, the meter reading
should drop by half. When you reduce the light to the solar cell, the
current in the circuit is reduced.
Place a sheet of paper over the solar cell and see how much it
changes the reading on the meter. Then add more sheets until the
meter reads zero.