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SR-1
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13
50. Install R16, 2 ohm [red-black-gold].
PROGRESS SUMMARY
Your shortwave broadcast receiver is now finished, except for using just a
few more parts to build a very effective speaker amplifier circuit.
51. Near R3 (volume control), install C17, 10 µF. electrolytic. This and
most remaining capacitors are polarized electrolytics, so please watch
your (+) and (-) designations and part orientations!
52. Install C18, .01 µF (marked .01, 103 or 10nF).
53. Install U3, the LM386 audio amplifier IC chip. The notched or banded
end MUST face to the right (battery area).
54. Install C19, .1 µF (marked .1 or 104).
55. Install C20, 100 to 220 µF. electrolytic.
56. Install C21, 100 to 220 µF. electrolytic.
57. Install J2, the subminiature speaker-headphone jack.
58. Install the 9-volt battery snap connector, making sure that the red (+)
59. If you desire increased audio output, C22, 10 µF, may be installed.
and black (-) leads are inserted correctly.
60. Install the battery clamp. Position battery and holder so as not to
cover nearby PC board mounting holes. Use the method for securing the
clamp that is most convenient for you, such as:
•
wire looped through clamp and PC board holes, soldered.
•
small screws
•
double-faced adhesive strips
•
hot-melt glue
SHORTWAVE ANTENNA IDEAS
The type of antenna you'll want to use for your SR-1 depends on the degree
of interest you have in shortwave listening, on whether you are limited to an
indoor or balcony antenna, and on whether you think you may soon want to
obtain a ham radio license. If the latter is true, you may want to consult ham
radio literature and build the dipole or vertical antenna which you also plan to
use for ham listening and transmitting. A 40-meter (7 Mhz) antenna is quite
nice for the tuning range of the SR-1.
The rest of these notes on antennas are for the benefit of SR-1 builders who
simply wish to enjoy some shortwave broadcast listening. The SR-1 is very
Содержание SR-1
Страница 7: ...SR 1 7 SR 1 PARTS LAYOUT DIAGRAM...
Страница 20: ...SR 1 20 Notes...