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28
Turn on the slide switch (S1). A police siren is heard and the lamp (L1) lights.
Project #57
Light & Sounds
OBJECTIVE: To build a police siren with light.
Project #58
More Light & Sounds
Project #59
More Light & Sounds (III)
Project #60
More Light & Sounds (IV)
Project #61
More Light & Sounds (V)
Modify the last circuit by connecting points X & Y. The circuit works the
same way but now it sounds like a machine gun.
Now remove the connection between X & Y and then make a connection
between T & U. Now it sounds like a re engine.
Now remove the connection between T & U and then make a connection
between U & Z. Now it sounds like an ambulance.
Now remove the connection between U & Z, then place the 470μF capacitor
(C5) between X & Y (“+” side to X). The sound changes after a few seconds.
Project #62
When you turn on the slide switch (S1), current ows from the batteries
through the slide switch, the 100W resistor (R1), the LED (D1), through
the LED (D2), and back to the second group of batteries (B1). Notice
how both LEDs are lit. The voltage is high enough to turn on both
LEDs when the batteries are connected in series. If only one set of
batteries is used, the LEDs will not light up.
Some devices use only one 1.5 volt battery, but they make hundreds of
volts electronically from this small source. A ash camera is an example
of this.
Batteries in Series
OBJECTIVE: To show the increase in voltage when batteries
are connected in series.
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