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FM-100 Page 35
H. MICROCONTROLLER
This section is a little vague in what’s
entailed. The microcontroller really controls
the entire circuit, but this section deals with
the parts which are fairly exclusive to the
controller itself. We’ll wait until later to install
the switches because they get in the way
while we’re installing the rest of the parts.
1H. Install R21, a 47K ohm resistor
(yellow-violet-orange).
2H. Install R20, a 1K ohm resistor
(brown-black-red).
3H. Install R18, a 1K ohm resistor
(brown-black-red).
4H. Install R6, a 10K ohm resistor (brown-black-orange).
5H. Install R10, a 10K ohm resistor (brown-black-orange).
6H. Install R12, another 10K ohm resistor (brown-black-orange).
7H. Install R14, yet another 10K ohm resistor (brown-black-orange).
8H. Install R19, a 1K ohm resistor (brown-black-red).
9H. Install Q3, a 2N3904 switching transistor. Make sure when installing
that the flat side is facing in the same direction as shown in the layout.
10H. Install SP1, the mini speaker. Make sure the + terminal of the
speaker is facing towards C50, but away from Q3. This is where
confirming tones are sounded when a button is depressed.
11H Install the 20 pin IC socket for U4. If the socket has a notch in one
end, install it at the same end the layout shows to prevent confusion later.
12H. Install R9, a 10 ohm resistor (brown-black-black). This resistor limits
the volume of the speaker.
13H. Install R5, a 10K ohm resistor (brown-black-orange).
14H. Install C22, a .1uF ceramic capacitor (marked .1 or 104).
15H. Install C17, a .01uF ceramic capacitor (marked .01, 10n or 103).
16H. Install J1, a 5 pin jumper header. Make sure the shorter ends are
installed into the board. This will be the connection to the digit display.
Содержание FM-100
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