Wednesday, November 12, 2014

Simple Police Siren Circuit Schematic Diagram using NE555

Robotronicdiagram. - Do you need simple police siren circuit schematic using timer IC NE555? In here we will show you one simple Police Siren Circuit Schematic Diagram using NE555 that we get from other site that we think it is will work properly like in figure 1 below.

Circuit Schematic

Figure 1. Police Siren Circuit using NE555 (Source: CircuitsToday)

Component List
  1. Resistors (See Figure 1 above)
  2. Capacitors (See Figure 1 above)
  3. D1 = IN4001
  4. IC1 and IC2 = NE555
  5. K1 = Speaker


Circuit schematic like in figure 1 above is Simple Police Siren Circuit Schematic Diagram using NE555. According the description of this circuit show us that A lot of electronic circuits using NE555 timer IC are already published here and this is just another one.Here is the circuit diagram of a police siren based on NE55 timer IC. The circuit uses two NE555 timers ICs and each of them are wired as astable multivibrators.The circuit can be powered from anything between 6 to 15V DC and is fairly loud.By connecting an additional power amplifier at the output you can further increase the loudness.

IC1 is wired as a slow astable multivibrator operating at around 20Hz @ 50% duty cycle and IC2 is wired as fast astable multivibrator operating at around 600Hz.The output of first astable mutivibrator is connected to the control voltage input (pin5) of IC2. This makes the output of IC2 modulated by the output frequency of IC1, giving a siren effect. In simple words, the output frequency of IC2 is controlled by the output of IC1.

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