ABSTRACT
This
project is design and construction of a sound detector with alarm system was
done primarily to detector sound. It can be use in industrial and domestics. It
employ four discreet stages with power supply which power the system.
The 1st
block is pick up amplifier containing the microphone and the input which serve
as a transformer which the function is to pick up the smallest sound that comes
close to the amplifier
The
second block is comparator with hysterias. The function as analogue to digital
convector and also it help to accumulate amparm sound like sound of the gun
short or any other heavy sound
Block
three. This is transistor switching this stage consist three bipolar function
transistor (BJI) with a decay circuit found using capacitor time constant (T –
RC) with a 12v Re let, it output work function is to switch the alarm circuit.
Block
four. This is the Alarm circuit, it’s function is the alarm tone. It is an
stable mutivibertor that produce 1kH2 tone frequencies which sound as alarm
signal with loud speaker which serves as an output transformer.
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