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HR20• 13
25. Install the 9-volt battery snap connector, making sure that the red (+)
and black (-) leads are correctly installed.
26. Install C7, .01µF disc capacitor (marked 103 or .01 or 10nF).
27. Install C8, 4.7-10µF electrolytic capacitor. Observe polarity.
28. Install U2, the LM386 audio amplifier IC chip. Just like the SA602, you
must correctly position the notched or banded end.
29. Install R6, 10K ohm resistor (brown-black-orange).
30. Install C12, 100-220µF electrolytic capacitor; observe polarity. This
capacitor couples the output of the LM-386 to the speaker jack.
31. Install C9, 4.7-10µF electrolytic capacitor; observe polarity.
32. Install speaker jack J2. This jack is a 2.5mm type and mates with any
2.5mm plug as found on virtually all mini earphones.
33. Install the 9-volt battery clamp. Use a scrap component lead to loop
through the two holes in the clamp and through the PC board. Solder the
leads firmly to the board and to the battery clamp. Do not use too much
solder on the clamp as this will cause the battery to sit too high and not
seat securely.
Congratulations! You have completed the assembly of your HR20 receiver kit.
Now is a good time to sit back and admire your work and make a final check
of all solder joints and component placement. It is always better to find errors
now before you test the HR20.