Description:
This circuit uses a UM3561 IC to produce four different sound effects.
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 (as drawn) being a Police siren, position 2 is a fire
engine sound, 3 is an ambulance and position 4 is a machine gun effect. The IC
is manufactured by UMC and was available from Maplin
electronics code UJ45Y. At the time of writing this has now been discontinued,
but they have have limited stocks available.
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