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FM-100 Page 41
19K. Install C86, a 3300uF electrolytic capacitor. Notice how there are
three holes available for the negative side of the capacitor. Only one of
these needs to be used by the capacitor. These holes just make
allowances for various lead spacings, just use the best fit. Make sure and
check polarity!
20K. Install C52, the other 3300uF electrolytic capacitor. Again make sure
the part is installed in the correct orientation.
21K. Install VR2, the 7808 +8 volt power regulator. Before soldering, bend
the part over while installed in its holes. Make sure the tab does not short
to the trace above it. Use a 4-40x1/4 screw and lock nut to hold the
regulator tightly to the board. The copper of the PC board works well as a
heat sink for this part.
22K. Install C4, a .1uF ceramic capacitor (marked .1 or 104)
23K. Install C5, a 100uF electrolytic capacitor (Watch polarity!).
24K. Install the transformer bracket over T1. Use four 4-40x1/4 screws
and 4 lock nuts on the top side of the board to hold the transformer in
place. Be sure to place the lock nuts on the top side of the board.
If
tightened on the bottom they may short out the power line!
25K. Locate a 4” piece of hookup wire . Strip back and tin each end about
1/4”.
26K. Insert and solder one end into the hold marked ‘A’ near the antenna
screw. The other end will attach to the rear panel mounted antenna jack.
Again check all of your work up to this point, especially the orientation of all of
the parts in the power supply section. Now we will install the parts for the 1
watt module.
Содержание FM-100
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Страница 22: ...FM 100 Page 22 MAIN BOARD PART LAYOUT...