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LM660AIN quad rail-to-rail opamp (U1)
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MC68HRC908JK1CP programmed chip (U3)
MISCELLANEOUS
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25 MHz crystal [silver can marked 25.0000] (X1)
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Laser pointer (D3)
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Microphone (MC1)
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DPDT pushbutton switch (S1)
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2 pin header (J1)
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3 pin headers (H1,H2)
2
jumper blocks for H1 and H2
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2.1mm DC power jack (J4)
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9 volt battery snap
3
cable ties
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wire with aligator clip on the end
Now, let's get building!
We'll begin assembly with the Receiver board and we'll install the ICs first;
that way you can lay the board flat and be sure you have them seated
correctly before soldering. Remember to save a few clipped off leads to use
as jumpers later in the assembly process. By now your parts are sorted, your
soldering iron is hot and you're ready to begin!
1. Install U1, the LM660AIN quad rail-to-rail opamp. Note that there is a
dot or notch on one end of the IC. Be sure to orient the part by following
the parts layout diagram and PC board silkscreen for the placement of
this notch or dot. Be sure all pins are through the board and the part is
sitting flat on the PC board before soldering. Solder all 14 pins.
2. Install U2, the LM386 audio power amplifier. Just as you did with U1,
orient the chip by the dot or notch and make sure it is flat to the board
before soldering all 8 pins.
3. Install R1, 1M ohms [brown-black-green]. Resistors can be installed
in either direction; just be sure the part is flat to the PC board before
soldering.
4. Install R4, 4.7K ohms [yellow-violet-red].
5. Install R5, another 4.7K ohm resistor [yellow-violet-red].
6. Install C2, .1 µF disc capacitor [marked .1 or 104 or 100 nF].
7. Install C6, a 10 µF electrolytic capacitor. Electrolytic capacitors have
a polarity and must be installed properly to function correctly and so that
LBC6K • 12
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