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PPM3 Page 16
5. In the same way install C20, a 10uF electrolytic capacitor, again
checking your polarity before soldering.
6. Install C19 and C18, noting that these are also 10uF electrolytics and
the polarity is exactly opposite to the two parts you just installed. Simply
follow the silkscreen and layout diagram for proper placement.
7. Install R14, 10k ohms (brown-black-orange). Resistors have no polarity
and can be installed in either direction, although your board will look more
uniform if you have all the gold stripes headed in the same direction.
8. Install R6, 470 ohms (yellow-violet-brown).
9. Install C8, 0.1uF capacitor (marked 104). Like resistors, disc caps can
be installed in either direction.
10. Install R17, 470 ohms (yellow-violet-brown).
11. Install D3, 1N4148 diode (orange glass body with black band). The
band indicates the cathode or negative side of the part. Follow the PC
board silkscreen and Part Layout Diagram for correct placement of the
band before soldering the part in place.
12. Install R21, 15k ohms (brown-green-orange).
13. Install R20, 470 ohms (yellow-violet-brown).
14. Install C17, 10uF electrolytic capacitor. Remember to watch the polarity
when installing!
15. Install R13, 10k ohms (brown-black-orange).
16. Install D7, another 1N4148 diode (orange glass body with black band).
Remember to line the black band up with the silkscreen for correct
orientation.
17. Install C24, 0.1uF disc capacitor (marked 104).
18. Install R25, 1 Meg ohms (brown-black-green). 1 meg is 1 million ohms!
Wow!
19. Install C2, 10uF electrolytic capacitor. Follow the silkscreen for polarity.
20. Install VR1, the 78L05 5 volt regulator. Place the flat side as shown on
the silkscreen. This part regulates the incoming voltage down to 5 volts for
the parts that require it, and, along with its associated capacitors, smoothes
out the voltage and “cleans” it up.
21. Install C9, 0.1uF disc capacitor (marked 104).
22. Install R28, 470 ohms (yellow-violet-brown).
23. Install R29, 220k ohms (red-red-yellow).
24. Install R26, 75k ohms (violet-green-orange).