Elenco PK101 w/ Computer Interface - Manual (Page 15)

Build the circuit shown. If continuing from the previous experiment then close the Winscope program
and run it again, to reset the settings. Click on the On-Line button to activate and press the switch. The
circuit makes a siren sound that slowly fades away. Try the settings shown here to view it.
The waveform at left shows the
signal just after pressing the
switch, the waveform below
uses the same settings and
shows the waveform just before
the sound stops. You see the
pulses slowly spread out as the
tone of the sound changes.
-15-
+9V
S
P
10k Ω
473
470 Ω
1M Ω
10 µµ F
+
-
Project PC3
OBJECTIVE: To look at the output of a slowly changing circuit.
Siren PC
SPEAKER