SC-1
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10
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13. Be certain to double check your component values, this will save
you a lot of problems! Now let's get back to building!
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14. Install R2, 1K [brown-black-red].
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15. Install R6, 470 ohms [yellow-violet-brown].
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16. Install C12, .01 uF (marked .01 or 103 or 10 nF).
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17. Install R5, 1K ohm [brown-black-red].
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18. Install C5, .001 uF (marked .001, 102, or 1 nF). C5 couples Q2 to the
PC board trace leading to the receiver jack.
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19. Install J2, the output jack to the AM receiver.
PROGRESS SUMMARY:
You've done the hardest part (getting started!) and
are over half-finished with your SC1 PC board wiring. Transistor Q1 passes
shortwave signals from the antenna to your AM radio. Now, all we need is an
oscillator (Q3,L1 and L2, etc.), and some voltage regulation (Q1).
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20. Install transistor Q1, 2N3904. Observe correct position of the flat
side.
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21. Install C13, 4.7 or 10 uF, the ONLY electrolytic or "polarized"
capacitor in the SC1 kit. Electrolytic capacitors have a right and a wrong
way they can be installed. The PC board is marked with a '+' sign while
the capacitor is usually marked with its negative '-' side. Observe correct
polarity!
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22. Install C6, 4.7 or 5 pf (marked 4.7 or 5 K). This capacitor will inject
Q3's oscillator signal to the input of Q2, so that the AM radio can tune
the sum or the difference of shortwave signals and the oscillator
frequency.
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23. Install push switch S2.
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24. Install C10, .001 uF (marked .001, 102, or 1 nF).
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25. Install R3, 100K [brown-black-yellow].
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26. Install C11, .01 uF (marked .01 or 103 or 10 nF).
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27. Install transistor Q3, watch position of the flat side.
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28. Install C8, 100 pF (marked 100, 101, or 101K).
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29. Install R4, 470 ohms [yellow-violet-brown].
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30. Install C7, the other 100 pF capacitor.
