CW700
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In order to save you money, we buy our parts in bulk. This is why R25 and
R10 are identical. For the speed control, there is no use for the switch
feature. Therefore, you have two choices. One is to simply disable the switch
feature. The other is to keep the feature so that you can experiment and use
it for a feature that you design.
79. In order to disable the switch feature, you
must first find the small post that is pushed up
when the switch is turned off. This is
accomplished by operating the switch. The small
non-metal object in the middle pushes up on the
post when you turn the switch off. Using a small
pair of cutters, cut the post away. The knob should
turn freely when operated through its whole range of motion.
80. Install B1, the battery connector. The red (or positive) lead should be
mounted towards the outside of the board, while the negative (or black
lead) should be mounted towards the inside of the board.
81. Before we connect the boards together, we have just three things left
to install. Find the battery holder for B1, a 9 volt battery. Also find a wire
clipping that is approximately one inch long. Taking the wire clipping,
insert it in the two holes on each side of the mount, and solder the wires to
the PC board. The wire clipping should hold the battery holder in more
securely. Now solder the wire to the battery holder where they touch,
making sure that the battery holder is very straight.
We will install U2, the 68HC705K1 microcontroller, and its X2402 memory
chip. A microcontroller is basically a whole computer in one chip. The chip
contains a microprocessor, the “brain” of real computers today, and also has
memory and other features. Of course it doesn't have enough speed and
memory to actually be put into a computer today, but it is enough to make
your Micro Memory Keyer send as fast as you want.
82. Install U2, the 68HC705K1 chip into it’s socket. Start by making sure
all of the pins are straight. Place the chip evenly on top of the socket,
making sure that the notch is pointing towards the battery holder. Next,
press evenly on the chip until it is completely in the socket.
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