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FM-100 Page 26
it. Don’t let this confuse you, so make sure the flat side of the transistor is
in the same orientation as shown in the parts layout.
22D. Install C81, a .01uF ceramic capacitor (marked .01, 10n, or 103).
This cap is used to filter out noise on the gates of Q5 and Q6.
23D. Install Q5, another BS170 FET. Make sure and mount the flat side in
the same orientation as shown in the layout.
24D. Install U8, one of the LF347 quad low noise opamps. Make sure the
dot or tab indicating pin 1 is installed in the same orientation as the tab
shown in the layout. Solder all 14 pins while making sure each pin has
been inserted into the board.
25D. Install C58, a 10uF electrolytic capacitor. Check polarity!
26D. Install C72, another 10uF electrolytic capacitor.
27D. Install C73, yet another 10uF electrolytic capacitor.
28D. Install C76, even another 10uF electrolytic capacitor.
29D. Install C77, a 10uF electrolytic capacitor.
30D. Install C80, a .01uF ceramic capacitor (marked .01, 10n, or 103).
31D. Install Q6, the last of the BS170 FETs. Again make sure that the flat
side is installed in the same orientation as shown in the layout.
Now it’s time to move on to the next section of our project, but maybe you
want to take an eyeball break first. Not including the pots that will be used for
control, the mixer and microphone sections are now complete. This would be
a good time to go through and check your work for good assembly practice.
Check for solder bridges, cold solder joints, and improperly oriented devices.
A common practice among engineers and techs at the factory when you can’t
find a mistake is to get up, take a short break and come back with a new per-
spective. You would be surprised how many problems you can find when you
do this. Sort of like getting up and leaving one marriage for a fresh, new per-
spective?
Onward!
Содержание FM-100
Страница 17: ...FM 100 Page 17 SECTION LAYOUT ON MAIN BOARD...
Страница 21: ...FM 100 Page 21 MAIN BOARD PART VALUES...
Страница 22: ...FM 100 Page 22 MAIN BOARD PART LAYOUT...