DDF1 • 22
64. Install a 324 Op amp in the U1 position, paying attention to the cor-
rect part placement. Solder all 14 pins.
65. Install R9 and R10, both 33K ohm (orange-orange-orange).
66. Install R1, 33K ohm (orange-orange-orange).
67. Install R4, 27K ohm (red-violet-orange).
68. Install C1, .01uF (marked .01 or 103 or 10nF) .
69. Install R2,R3, and R7, all 33K ohm (orange-orange-orange).
70. Install C2 and C3, both .01uF (marked .01 or 103 or 10nF).
Great going! You are really making progress now. Let’s finish up the compo-
nents on the “component” side of the circuit board.
71. Install R21, 220K ohm (red-red-yellow).
72. Install R22, 10K ohm (brown-black-orange).
73. Install electrolytic capacitor C8 (1 uF). Be sure to orient the part cor-
rectly.
74. Install R18, 100K ohm (brown-black-yellow).
75. Install the last 324 Op amp in the U2 position. Be sure to orient the
part correctly before soldering.
76. Install D5, a 1N4148 diode. Again, observe the correct polarity for
this part.
77. Install R32, 22K ohm (red-red-orange).
78. Install R31 and R20, both 33K ohm (orange-orange-orange).
79. Install R33, 68K ohm (blue-gray-orange).
80. Install C18 and 19, both .01uF (marked .01 or 103 or 10nF).
81. Install R30, 33K ohm (orange-orange-orange).
82. Moving to the right, install R51, 47 ohm (yellow-violet-black).
83 for the final component on the main board component side, install
C38 (.01uF) (marked .01 or 103 or 10nF).
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