Elenco Electronics rc snap rover Bedienungsanleitung PDF herunterladen (Seite 24)

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Project #45

OBJECTIVE: To make a circuit that uses light to control the

blinking of another light.

This circuit does not use the noisy speaker (SP) it uses a nice quiet

LED (D1). Turn on the slide switch (S1), the LED flickers. Wait a few

seconds, then cover the photoresistor (RP) and the flicker stops. The

flicker is controlled by the photoresistor, uncover it and the flicker

resumes.

People who are deaf need lights to tell them when a doorbell is ringing.

They also use circuits like this to tell them if an alarm has been

triggered or an oven is ready.

Can you think of other uses?

Light-Controlled Flicker

Project #46

OBJECTIVE: To investigate the different sound effects available

from the alarm integrated circuit.

Build the circuit shown on the left.

When you close the slide switch

(S1), the integrated circuit (U2) should start sounding an up-down

siren. This is just one more sound effect that this integrated circuit is

designed to produce. Different sounds that can easily be changed are

very important when designing games and toys. Switch the sound on

and off quickly and see if you can create even different effects. This

mode will create many robotic sounds if switched quickly.

More Sound Effects

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Elenco Electronics rc snap rover Bedienungsanleitung Seite 24