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FM-100 Page 31
G. TRANSMITTER
This is where we definitely want to
have clean soldering skills and
proper mechanical mounting of
parts. If you need a review, shoot
back to the start of the manual in the
“STRATEGY” section for tips. Make
sure all your parts are flush to the
board and not waving in the breeze.
You will not only lose performance if
parts aren’t installed correctly, but
your kit may not work at all. Have
patience and follow all directions
and you should have no trouble at
all!
1G. Install JMP5 using a scrap piece of lead wire. Leave the jumper “loop”
about 1/4” above the board to allow you to cut it out later. If you wish to
operate the FM-100 in mono, this is the jumper you would cut.
2G. Install Y2, the 38KHz crystal found taped to
a piece of paper. Before mounting, bend the
leads so that they don’t short to ground when
installed. We want to install the part in a lay-
down fashion so that we can strap the crystal to the board with a jumper
so that it is secured in place. Lay it down in the orientation shown, then
use a scrap piece of lead to make a loop over the crystal to hold it tightly
to the board. You can’t miss the two holes where this loop is mounted to.
3G. Install the 18 pin IC socket. Make sure all the leads are though the
board before soldering. Install U6, the BA1404 stereo generator IC, mak-
ing sure that the part is installed in the correct orientation.
4G. Install R46, a 150K ohm resistor (brown-green-yellow).
5G. Install R42, a 4.7K ohm resistor (yellow-violet-red).
6G. Install R15, a 100K ohm trim pot (orange Philips top marked 104).
This will adjust the MPX balance of the internal workings of the BA1404.
Normally this control is at center position.
7G. Install R3, a 1M ohm resistor (brown-black-green). This resistor helps
Y1 begin to oscillate when the unit is first turned on by biasing an internal
inverter in U2 into a linear range.
8G. Install R7, a 100K ohm resistor (brown-black-yellow).
Содержание FM-100
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