Elenco Basic Electronic Experiments - Manual (Page 50)

50
EXPERIMENT #34: THE SPACE GUN
Connect the circuit and press the switch several times quickly. You hear a sound like a space gun in the movies. You can
adjust the “gun” sound using the variable resistor. If you find it inconvenient to turn the VR knob while pressing the switch
then just connect a wire across the switch.
Do you know how this circuit works? It’s basically the same as the last circuit except for the 10 μF capacitor, which instantly
charges up when you press the switch and then discharges by powering the circuit for a few seconds after you release the
switch.
You can experiment with changing component values if you like.
+9V
S
P
33k Ω
473
10 μF
470 Ω +
-