Police Light Circuit Design


Police light have been with us for years, since then they have developed greatly, with technology continue so have areas of police light and how they are created, developed and manufactured nowadays. In the 1940s government bodies used single beacon lights, which was placed together with their cars. Early 1990s the solo beacon lights became less common as light pubs where introduced, they truly became popular and replaced the one beacon light.

Police signals are a substantial facet of many emergency vehicles, as its one with their most recognisable features, which informs the general public that indeed the given vehicles is an emergency vehicle. This technique is managed by in system control buttons within the vehicle itself, which allow the user to acquire full control of the lights system, determine how and when the lights seriously or set off, and even how the law enforcement officials light behave in conditions of how they display.

This system can be used in the case of an emergency, an individual will turn it on whenever there can be an emergency, as a result the general public will be aware that that given vehicle is an emergency vehicle, this enables the general public to react with necessary action, in that given situation.

Principle behind the circuit

Circuit diagram

Required components


  • NE555 Bipolar Timer
  • 4017 10 years Counter
  • 1N4148 Diode
  • 1. 2K Resistor
  • 10K Resistor
  • 470 Resistor
  • 4. 7uF Electrolytic Capacitor (50V)
  • BC547 NPN Transistor
  • LED
  • 10K POT
  • Switch


  • Proteus 8 professional
  • Windows 10

Components used


When endeavoring to resist the stream of alternating or immediate electric circuit a resistor can be used in order to perform that action, this little bit of component is located in the electric circuit, depending on circuit and how it functions the positioning of where the resisters are positioned will vary. In electric circuits a resistor is typically used to either limit or divide the existing, protect an electric circuit or reduce voltage. Once the billed particles(electrons) move from one region to some other it is known as electric energy. the shape of your resistor is cylindrical. There are various types of resistors which have different values, when using resistors, you can identify the worthiness of the resistor by looking at color coding, resistors have something known as a coloring group, a resistor can have 3, 4 or 5 5 colour bands, depending on the resistor value. If the temperature is regular the current thickness is directly proportional to the electric field, which obeys ohms' rules.


A component like a capacitor can be used when needing to store a power charge. When electricity is put into the capacitor it is recognized as charging, but when energy is release from the capacitor it is known as discharging. A capacitor has two steel plates, which can be separated by the non-touching layer to create a dielectric. Electricity from a direct current or an electrostatic source charges one of the plates. When electric power is supplied by having a circuit electrical fee will gradually build up in the plates. While one plate gains a good fee, the will gain a poor charge. Whenever you integrated a capacitor within a circuit that might contain a light or motor unit, the charge of the capacitor circulation through the light fixture or electric motor, until there is no charge staying gin the plates. The capacitance of a capacitor is the quantity of electrical energy the capacitor can store, the bigger the capacitance a lot more electricity it can store. A couple of an array of capacitors available on the market, such as Air, Mica and Paper, depending on the intended goal, different capacitors are employed.


A component like a transistor is a device which can be used to transforms current move from a minimal resistance to al high level of resistance avenue. A transistor is a solid-state device which consists of a piece semi conducting material, which can usually be silicon or germanium. When negatively charged, electrons can be found we call a transistor an n-type transistor, because it has donor impurity atoms. However, when positively charged electrons are present we call a transistor an p-type transistor, because it has acceptor impurity atoms.

Flow chart


  • User control
  • Ease of use
  • No mercury in LED
  • Cheap
  • Light up quckly


  • Colour shift
  • Constant stream of voltage and current


  • future enchancments
  • Light patterns - changing how thy flash

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