SP-1
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11
40. JMP13.
41. JMP16.
42. JMP10.
43. JMP9.
44. JMP8.
45. Install C12, 470 uF electrolytic, watch polarity.
46. Install R6, 10K (brown-black-orange).
47. Install R7, 47K (yellow-violet-orange).
48. Install C4, .47 uF, watch polarity.
49. Install C8, .47 uF, watch polarity.
50. Install C1, 100 pF. (marked 100 or 101).
51. Install R5, 68K (blue,gray,orange).
52. Install JMP4.
53. Install JMP17.
54. Install R10, 100 ohms (brown-black-brown). Note: if a battery will be
used, for intercom or because of low phone line voltage, R10 should be 270
ohms (red-violet-brown).
55. Install JMP19.
PROGRESS SUMMARY:
The schematic diagram makes it clear that building
the kit consists largely of providing the supporting components for the many
functions of the MC65118 IC. Much of that has been done already. This would
be a good time to double-check the correctness of parts selection and
orientation. Next, we'll build up the LM386 speaker amplifier circuit, install U1
and a few more components, and we'll be ready for testing.
56. Install R13, 4.7K (yellow-violet-red).
57. Install C27, 470 uF, with correct polarity. C27 couples the output of U2
the speaker.
58. Install C17, .47 uF with correct polarity.
59. Install C29, 2.2 uF, with correct polarity.
60. Install C28, .1 uF (marked .1 or 104).
61. Audio amp U2, IC LM386 is soldered directly to the PC board with the
