Rectifier diodes

May 15th, 2015
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Rectification: Simply defined, rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electrons. As we have seen, this is exactly what a semiconductor diode does. The simplest kind of rectifier circuit is the half-wave rectifier.

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Automatic Street Light Controller 2003Introduction Aim of the project Block diagramComponents used Rectifier diodesTransistor78XX regulator IC NE 555 Timer IC ResistorCapacitorRelay Circuit diagramCircuit operationApplications AdvantagesDisadvantagesLimitation Future scope ConclusionBibliographyIntroduction:We have seen many more times that our street light were turned On even in day time also. This shows that we are wasting much power even it may be saved and supplied for any crop fields for several hours. Here in this project we had designed a simple and cost less circuit using 55 timer ic and LDR (light dependent resistor).Aim of the project:Our main objective of this project is to design and implement a low cost street light controller. This circuit uses a single 555 Timer Ic and LDR (light dependent resistor) and a relay. This circuit uses only 9 volts for effective performance. When light is high on the LDR the resistance of LDR will be very less. Here 555 timer IC is configured as a monostable multivibrator. The LDR will trigger the 555 timer. The output of the 555 timer IC is directly fed to the baser of the transistor. This gives low signal and it turns ON the coil voltage of the relay. Street lights were connected to relay. Block diagram:Components used:R1-560ER2-10KLDR555 Timer IC 7809 regulator ICVR1-10KD1-D2- 1N4001D3-4148LED -5mm red colourQ1 BC 547Relay -6v DC C1-2200uf 25vC2- 220uf 25vC3-100uf 50vC4-0.1ufC5

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