Elenco Upgrade Kit SC300 to SC750 - Manual (Page 25)

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Project #357
OBJECTIVE: Build an adjustable light-controlled relay.
You can set the amount of light it takes to keep the bulb (L2) on by
adjusting the adjustable resistor (RV). Set the adjustable resistor to
the top position and turn on the switch. The bulb lights. Cover the
photoresistor (RP) and the bulb turns off. Set the adjustable resistor
to different positions and then cover the photoresistor. Note that only
the top half of the adjustable resistor affects the circuit. If you position
it below the middle, the bulb stays off.
Adjustable Light
Control
Project #358
OBJECTIVE: To demonstrate the properties of a transformer.
Set the meter (M2) to the LOW (or 10mA) scale. Pressing the press
switch (S2) generates a current on the left side of the transformer (T1).
The current lights the LED’s (D1 & D2) and deflects the meter. There
are two current paths as shown by the arrows. Placing the meter in
both current paths always measures each current. The top current is
produced when the press switch is pressed and the bottom current is
produced when the press switch is released.
Meter Deflection
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