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.
