Description:
This circuit uses the Holtek HT2884 IC to produce 8
different sound effects.
Notes:
All sound effects are generated
internally by the HT2884 IC. Power is a 3 Volt battery, but the IC will work
with any voltage between 2.5 and 5 Volts. Switch S1 is the on / off switch. The
output at pin 10 is amplified and drives a small 8 ohm loudspeaker. Pressing S3
once will generate all the sounds, one after another. S2 can be used to produce
a single sound effect, next depression gives the next
sound effect. There are 2 lazer guns, 1 dual tone
horn sound, 2 bomb sounds, 2 machine gun sounds and a rifle shot sound. Standby
current is about 1 uA at 3 Volt, so battery life is
very economical. The IC may be obtained from Maplin
Electronics order code AZ52G.
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