Fun Projects 09 Chapter

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Fun Projects 09 Chapter Powered By Docstoc
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              6V X 1A POWER
                          SUPPLY(P)
In orderto perform experiments projects
                             and         involving         you
                                                 electricity willneed
a sourceof voltage. Voltagerequirements commonprojects,
                                       for                  suchas the
onesin thisbook,  depend upontheirapplications, typically
                                              and          rangefroma
few milliamperes one or two amperes.
                 to

lnstead usinga battery
       of             you can use a circuitcalleda powersupply.

The powersupplywe showherecan be usedto provide x 1A regulated
                                                     6V
outputto the experimental and practical               in
                                      circuitsdescribed this book.The
outputvoltageis fixedby the lC.

Figure l showsthe schematic diagram this powersupply. is a voltage
                                   for                 lOl
regufator,#7806. The "06"indicates it is a 6-voltregulator.
                                 that

Figure2 showsthe components     usinga terminal
                          layout,             stripas chassis.
The complete project be assembled a smallplastic
                    can              in                box.The integrated
circuitshould mounted a heatsink. can alsoadd an LEDin series
             be          on           You
with a 470 ohm resistor,
                       wiredin the outputof the circuitto indicate
                                                                 that it is
on.

External
       circuitscan be connected the powersupplywith alligator
                              to                            clips.
                     pieces,
Position the polarized
       of                  suchas diodes,the lC, and electrolytic
                                                                ca-
pacitors,
        mustbe observed.

Thetransformer a critical
             isn't         partof this project.
                                             Typeswitha secondary
                                                                coil
rangingfrom7.5 to 12 voltsand currents  between 500 mA and 14 can be
used.




5f
                          trolrctg 8ur ll Pil0tsuillr




                                   c2   tl_
             D2
                                  100pFT I
            1N4002                      I
                                         =
   T1
                                              lou
12 + 'l2Y
               c1
             1000pF
   1A




               Figure I




               Fiaure2
                -


t
                                                    55
mFrtmctrtrtrHilffi

               PartsList - 6-VoltPowerSupply
     lOl    - 7806positive           regulator
                         three-terminal
     T1     - Transformer:
                       primary 17VAC; seconda 12+12Y 1A
                             1              ry     x
     D1,2 - 50Vx 1A- 1N4002 equivalent
                          or              rectifier
                                    silicon      diodes
     C1     - 1,000 25WVDC
                   uF,    electrolytic
                                    capacitor
     C2     - 10uF,12WVDCelectrolytic
                                   capacitor
     S1     - SPSTswitch




                        ldeasto Explore
Tolearnmoreabout circuit altertheperformance:
               the     or
     o Replace bya 7805,
              lC1        7809or 7812if youwanta 5V 9Vor 12V
     powersupply. mayalso haveto change transformer a
                You                      the         with
     117:15+1 using
            5V     a7812.
     .          how
          Explain thecircuit
                           works.
     o Whatis theditference
                          between ACanda DCcurrent?
                                an
      and
Science uncommon
               applications:
     o Thispower          can
                   supply be usedin chemical               such
                                               experiments, as
     the onesthatinvolve        flow
                          current through             Experiments
                                            substances.
     involvingelectrolysis electroplating twothatcanbesuggested.
                        and             are
     A variablewound-wire  potentiometer ohms, watts)
                                       (100      5       shouldbe
     wired series thepower
           in     with         supply      to
                                     output limit      flow
                                                current through
     theload.You alsousetheLight
                 can                 Dimmer         in
                                            described thisbook for
     thistask.


!a
                               Plrflct g 0ur lt Pilil $utilr

                           lamps be supported this
o 6V 200 mA smallincandescent   can         by
power      These
     supply.    lamps excellent sources workwith
                      are      light   to
microscopes.
o Small       and    in                physics,
                               involving
        motors lamps experiments             mechan-
icsand robotics be powered thispower
              can         from             with
                                     supply advan-
tages. don'thave spend lotof money cellsor batteries.
     You          to    a         on
o Allcircuits       in
            described thisbookwhich               can
                                   require 6Vsupply be
                                         a
powered thispower
        by         supply.
                                  power
o Thecircuit be usedas an excellent
           can                         adapter youi6V
                                             for
equipment, as smallradios,
         such                       etc.
                          calculators,
o 6V lamps be usedin experiments
             can                             plantgrowth.
                                     involving          Se-
lecta fastgrowinghouse plant use.a
                           and      darkroom cardboard
                                             or         box
to coverthem.       with
              Lamps colored                  in
                             filters beused anexperiment
                                   can
involvinggrowth development.
                and
o Circadian        can          usinganimals plants.
           rhythms alsobe studied          or
Lamps be powered at night otfat day.
      can           on    and        Whatphysiological
        couldbe atfected?
functions




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