Abstract :
This is a simple, but low-ripple power
supply and an excellent project if you're starting out in electronics. It will suit your needs for most of
your bench testing and prototype applications.
The output is adjustable from 1.2 volts
to about 30 volts. Maximum current is about 1.5 amps which is also sufficient
for most of your tinkering. It is relatively easy to build and can be pretty cheap if you
have some or all the required parts. A printed circuit board is not included
and I'm not planning on adding one since the whole thing can easily be build on
perforated or Vero board. Or buy one of Radio Shack/Tandy's experimenters’ boards (#276-150). Suit
yourself. The meter and the transformer are the money suckers, but if you can
scrounge them up from somewhere it will reduce the cost significantly. BR1 is a
full-wave bridge rectifier. The two '~' denotes 'AC' and are connected to the 25vac output coming
from the transformer.
IC1 is a 3-pin, TO-220 model. Be sure
to put a cooling rib on IC1, at its max 1.5 a current it quickly becomes very
hot. All the parts can be obtained from your local Radio Shack or Tandy store.
The physical size of the power supply case depends largely on the size of the
meter & transformer. But almost anything will do. Go wild.
For any circuit to study or construct,
first of all we need to have a translucent picture of our required circuit. We
must have all the details of the inputs and outputs of the circuit so that there
must be no error while constructing the given circuit. So in the following
paragraph there is a detailed description of the circuit to be done.
Download :
Regulated Power Supply PPT