FM-100 Page 24
C. MICROPHONE AMPLIFIER
1C. Orient the board in the same direction as
shown in the parts layout diagram.
2C. Install R24, a 33K ohm resistor (orange-
orange-orange).
3C. Install R70, a 10K ohm resistor (brown-
black-orange)
4C. Install R17, a 10K ohm resistor (brown-
black-orange)
5C. Install R48, a 1M ohm resistor (brown-
black-green).
6C. Install U7, the MC2830 voice detector IC. Make sure the part is orient-
ed correctly before soldering, and that all 8 pins are through the board.
7C. Install R49, a 10K ohm resistor (brown-black-orange).
8C. Install D8, a 1N4148 type diode (small glass orange body with black
stripe). Make sure the striped end that indicates the cathode is oriented in
the same direction as shown in the layout.
9C. Install R55, a 10K ohm resistor (brown-black-orange).
10C. Install R41, another 10K ohm resistor (brown-black-orange).
11C. Install R25, a 220K ohm resistor (red-red-yellow).
12C. Install R38, a 1M ohm resistor (brown-black-green).
13C. Install R29, a 1K ohm resistor (brown-black-red). Note that this part
stands upright.
14C. Install C38, a 1uF electrolytic capacitor. Make sure that it is installed
with the correct polarity. Make sure the stripe indicating the negative side is
on the other side from where positive is marked on the PC board.
15C. Install C33, a 10uF electrolytic capacitor. Check polarity!
16C. Install C42, a 10uF electrolytic capacitor. Polarity!
17C. Install C59, a 47uF electrolytic capacitor. Again check polarity!
18C. Install C39, a 10uF electrolytic capacitor. Orientation!
19C. Install C12, a 2.2uF electrolytic capacitor. Polarity again!
20C. Install C47, a 47uF electrolytic capacitor.
