AVR Projects GENERAL

DESIGN AND CONSTRUCTION OF A POWER SUPPLY UNIT

What is power supply unit?

power supply unit (or PSU) converts power i.e voltage from the mains AC to low-voltage regulated DC power for the internal components of an electronics current using devices.

we have two types of power supply unit which are; linear power supply, switch mode power supply (smps) e.g for example Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage.

but I will like to expanse on Linear power supply unit i.e A Rectification circuit of 5v power supply

5V power supply

COMPONENT USED

Voltage Regulated IC Lm7805

16 or 25v by 1000uf capacitor

10k resistor

bridge rectifier or combination of 4 diodes

12v stepdown transformer

Ac plug

fuse(optional)

switch(optional)

breaking down of the meaning or what the component used is;

TRANSFORMER

A Transformer is a component that has two coils and produce voltage at the other coil through electromagnetic induction when a voltage source is applied to one of it coil without change in phase.

AC SOURCE(Alternating current)

I will define AC with this three properties

  1. The current changes direction
  2. The voltage changes polarity
  3. it has frequency.

FUSE

A Fuse is an over current sacrificial devices which got blown off when the fuse  current is exceeded. it also has different rating of 5A, 10A e.t.c

SWITCH

A Switch is a component that can be used to make and break contact between two connections.

DIODE

A Diode is component which allow current flows in one direction when it is forward biased and blocks reverse current.

RESISTOR

A resistor is an electronic component that limit the flow of current in a circuit.

VOLTAGE REGULATED (IC)

these are used for regulating D.C voltage to a value indicated on the I.C.examples of this I.C are; lm7805, lm7806, lm7809, lm7905, lm7906 e.t.c.

CAPACITOR

An electronic component that store charges temporarily is known as capacitor.

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