Introduction
When transistor began
to replace valves as the active component of electronic circuit ,the first
thing that designers appreciated was that some electronic equipment
BECAME REALLY PORTABLE IE radio
could t last be made slip into pocket however transistor were also small
and required low voltage batteries .
To those individual who
clearly remember electronic before transistor ,the
change to miniaturization of electronic equipment has been remarkable ,Gone
were the bulky HIGH-TENSION and
LOW-TENSION batteries of valve circuits.
Radio which are built
into the frame of spectacles and televisions
which can rest in the palm of hands
brought the trend of miniaturization
which lead to the advancement in
computer technology and space exploration
One of the drawback of
portable, battery –operated radios is that batteries have to be bought also it
gets drain with time .one of the
solution is to buy a radio which has the
facility to recharge its internal battery from mains another is to have a radio that can operate
from mains and or battery
This project describes a circuit that gives
an output of 12v regulated power supply which also eliminates the inconveniences and cost
of replacing batteries
CIRCUIT DIAGRAM
COMPONENT REQUIRED
Transformer (12012)v
step down
Diode(1n40003)
Capacitor(100ufx25v,470ufx16v)
Zener diode (12v)
Transistor(2n3704)
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