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					                                                                                             :
                          Light Emitting               Varactor        Schotky               Tunnel                     General
Photo Diode Photo Diode     Diode LED
                                           Gun Diode                                                      Zener Diode
                                                        Diode           Diode                Diode                       Diode




    14 A/ 400 V                             6 Amp                              4 Amp                               1 Amp

                                                                               (                      )
                                                                                        ..

                                                                                                 .. (+ , - , ~)
                                                                                                                   (~ )
                                                                                                      .. (          )
                                                                                 ..                            (+ , -)


                                                                                 .. (                          )
                                                                          ..



                                                                  ..




9
                                                                The formula for C1 is:
                                                                                                   6
                                                                C1(uF)=[(IL* t )/Vrip ] X10
                                                                                                   6
                                                                C1=[(0.5A X 0.00833) / 0.92V]X10

                                                                C1 = 0.00453 X 10 6 = 4529 uF




                                                                         ..




              Single diode rectifier                   Output: half-wave varying DC

                                                                                        :




                                                                         5 × Io
           Smoothing capacitor for 10% ripple,                      C=
                                                                         Vs × f

Io = output current from the supply ..
Vs = supply voltage (peak value of unsmoothed DC) ..
f = frequency of the AC supply (50Hz in UK) ..



10
                                                               :

Transformer + Rectifier




Transformer + Rectifier + Smoothing




Transformer + Rectifier + Smoothing + Regulator




                      ..
             (78XX)                   (78XX , 79XX)
                           ..                         (79XX)
                                          .. (                     )
                                                                       :
                                                 ..




11
     .. (78XX , 79XX)




12
                                                                                 :




              :
                          (10.5V)                            (7808)
 ..(10.5+0.7+0.7=11.9V)                                           (0.7+0.7)
                              ..(11.9 / 1.41 = 8.145 Vrms)
       .. (LM317)                                               (78XX , 79XX)

                                                                          :




                                                                                (1N4004)
                                                                      .




13
                                   Variable DC Power Supply
          (LM317)                        (1.25   TO    25)
                                                      (5K)
                                                             ..




                                                                                              :
             ..DC                  AC                                                       D1-D4
                 C2                                                                             C1
                                                                                                 ..
                    .                                                                        LM317
                                                                                               D5
                                                                                   .
R1                                                       V
                                                                           .
                         VR1                            VR1
                                                                                   .
                                                                       :
                                  VOUT = 1.25 ( 1 + VR1 / R1)
                        C5   C4                                                        C3
                                                                               .
5mA
      :                                                  R2       R2                             20mA

14
     R2 = (VOUT - VLED) / (10 x 0.001)
                                         VLED   2V :




     +/-15V Preamplifier Power Supply




15
                           ( 1.2 To 25 V )




      Vdc
                2Vm
                               Vdc
                                         2Vm       Vdc Vm

                Vm                       Vm                  Vm
      V                        V                   V
         rms     2                rms     2
                                                    rms       2

               2 2V                     2 2V                 2V
                     rms                    rms   Vdc          rms
     Vdc                     Vdc

       VDiod    Vm             VDiod     2Vm       VDiod     Vm

      I Diod   0.5 IL          I Diod   0.5 IL      I Diod   IL




16

				
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posted:7/16/2012
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