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31. Identify C1, the 10 uF electrolytic capacitor. Electrolytic capacitors
are polarized with a (+) and (-) lead and must be installed in the correct
orientation. Ordinarily, only the negative side is marked on the capacitor
body with a dark band and the (-) sign clearly shown, while the PC
boards will usually show the (+) hole location. Use care to ensure proper
polarity. See the parts diagram for proper placement. The capacitor
should fit snugly down to the PC board.
32. Install C1, noting the polarity.
33. While we are in the area, lets install C10,.01 uF disc (marked .01 or
103 or 10nF).
34. Install resistor R4, 270 ohm (red-violet-brown).
35. Install C4, 10 uF electrolytic capacitor. Be sure to orient the part
correctly. See the parts layout diagram for proper placement.
Believe it or not, you're better than halfway done with your treasure finder!
Take a short break to examine your work up until now. You have completed
the two oscillators that are contained in the circuit. Well, that's enough of a
rest, lets get back to work!
Next we'll work on the audio path for the output signal.
36. Install, C9, 220 uF (marked 220 uF). Again, this capacitor is
polarized and should be placed in only one direction.
37. Jumping around a bit, also install electrolytic capacitor C12, 220 uF.
Watch that polarity!
38. Using a scrap component lead, form a jumper wire and install in the
JMP2 holes. Jumpers are like electronic "bridges" that carry signals over
the PC board traces.
39. Install C13, .01uF disc capacitor (marked .01 or 103 or 10nF).
40. Install U2, the LM386 audio amp IC. Make sure to align the notch or
dot associated with pin one with the notch shown in the parts layout
diagram. Also check to be sure all 8 pins are through the board before
soldering the IC in place.
41. Using a scrap component lead, form a jumper wire and install in the
JMP1 holes.
42. Identify and install R9, the 2 ohm (red-black-gold) resistor.
TF1 • 13
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