Instruction manual

DDF1  20
 Locate the two(2) 555 time IC’s
52. Install U6, 555 timer IC.
53. Install U4, 555 timer IC.
 Locate the 74HC4051 IC
54. Install U5, 74HC4051 IC.
 Locate the 74HC42 IC
55. Install U8, 74HC42 IC.
 Locate the 7805 three lead voltage regulator
56. Install VR1, 7805 voltage regulator IC. Install as shown in the dia-
gram by carefully pre-bending the component leads at right angles to
the IC. The component should fit flush to the printed circuit board. Sol-
der all three leads.
Note that the following diodes have a band on one end of the case. It is im-
portant that the band be positioned so it matches the band of the pattern on
the board.
 Locate the 1N4002 diode, (black epoxy case with a white polarity
“band”)
57. Install D6, 1N4002 diode.
 Locate the three(3) 1N4148 diodes, (small glass component marked with
a polarity band)
58. Install D2, 1N4148 diode .
59. Install D1, 1N4148 diode.
60. Install D5, 1N4148 diode.
Next come some capacitors This bunch will be ceramic disc type capacitors
and they may be installed in any direction. Just remember to keep them
close to the board so they look like a pro assembled your DDF1.
 Locate three(3) .001uF capacitors [marked 102]
61. Install C22, .001uF disc capacitor.
62. Install C24, .001uF disc capacitor.
63. Install C26, .001uF disc capacitor.
 Locate ten(10) .01uF capacitors [marked 103]
64. Install C9, .01uF capacitor.
65. Install C5, .01uF capacitor.
66. Install C4, .01uF capacitor.
67. Install C6, .01uF capacitor.