This simple IC 555 based circuit can be used to generate many different noises whose pitch and modulation can be adjusted as per user preference.
Numerous achievable applications for noise generating circuits is completely incredible - quite a few to be listed in the accessible space.
This is specifically correct of the unit explained in this article. However is not precisely unique in idea, the can has the ability of producing a din which will most definitely abandon your ears tingling for a long time.
The circuit includes hardly any components which collectively form a 'Kojak ' type siren. Almost all of the job is performed by two (555) timer ICs.
How the Circuit Works
The first (IC1) produces an audible tone whose frequency are adjustable through potentiometer P1.
The output of this timer is fed straight to a loudspeaker. The loudspeaker on the other hand will not give off a constant tone, as IC1 is modulated by a low frequency sawtooth waveform produced by IC2.
The frequency of the sawtooth is usually governed through potentiomcier P2. Due to this fact, the entire circuit produces a frequency modulated signal which appears to be similar to a siren.
The pitch are adjustable with P1 and the modulation rate with P2.
The adjustable noise generator circuit is streamlined enough to be mounted in a can together with the batteries and loudspeaker and can be applied pretty effectively on children' s cycles, skate boards etc. or as an 'anti-attack' alarm.