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We offer an optional kit, the CW700MX, which simply plugs into the socket.
This upgrade, the CW700MX will store up to 32 messages.
33. Install R28, 10K ohm resistor [brown-black-orange].
34. Install R27, 10K ohm resistor [brown-black-
orange].
35. Install R26, 10K ohm resistor [brown-black-
orange].
36. Install R23, 470 ohm resistor. [yellow-violet-
brown].
37. Install D3, 1N4148 glass bead diode.
Remember to insert it with the band facing in the
proper direction.
38. Install D4, 1N4148 glass bead diode. Again,
pay attention to the band.
39. Install C10, .01uF disc capacitor [marked .01 or 103 or 10nF].
40. Install R18, 10K ohm resistor [brown-black-orange].
41. Install C9, .01uF disc capacitor [marked .01 or 103 or 10nF].
42. Install C11, 10uF electrolytic capacitor. Electrolytic capacitors are
polarized with a (+) and a (-) lead and must be installed in the correct
orientation. Ordinarily, only the negative side is marked on the capacitor
with a dark band and the (-) sign clearly shown, while PC boards will
usually show the (+) hole location. Use care to ensure proper polarity.
43. Install R20, 1K ohm resistor [brown-black-red]. This resistor must
be mounted "standing up." (Boy, if those resistors didn't have such
strong legs, you might open your kit up some day and find them all
laying down on the job.)
44. Install R32, 1K ohm resistor [brown-black-red]. Make sure that this
one stays standing up also.
45. Install C13, another 10uF electrolytic capacitor. Be sure to pay
attention to the polarity.
You have now completed the power supply for the microcontroller chip. You
have also completed the circuit that determines the speed of the code.
Please check for bad solder joints and insure that all of the parts have been
inserted correctly. Give your eyes a rest. When you return, you will be
building a circuit for the memory chip first. Then, you will be building the
circuit that makes the tone that you hear, and it's volume control.
CW700 • 15
Capacitor
Speed
5 to 32
C19
10 to 60
C14
3 to 23
C14 and
WPM
C19
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