This circuit uses a UM3561 IC to produce four different sound effects.UM3561 IC Sound Effect Generator Circuit Notes Nothing too complicated here. The IC produces all the sound effects, the output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker can be substituted in place of the 56 ohm resistor and 8 ohm loudspeaker. The 2 pole 4 way switch controls the sound effects. Position 1
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