37
Microcontroller Circuit Board – Top View
(1) Install all of the 1/4 watt resistors, making sure the resistor bodies are flat against the
circuit board and that color codes are aligned in the same direction:
R201
1 K
Ω
(brown-black-red)
R202
100 K
Ω
(brown-black-yellow)
R203, R205 10 K
Ω
(brown-black-orange)
(2) Install a 10 K
Ω
trimpot at R204.
(3) Install blue epoxy-dipped ceramic capacitors as follows:
C201–C205 0.1 µF / 50V (marked 104)
C207
1000 pF/50V (marked 102)
C208, C209 0.01 µF/50V (marked 103)
(4) Install 1N4005 diodes at D201-D203. Make sure the diodes bands are oriented as
shown on the silkscreened legends.
(5) Install a 24 pin IC socket at U201. Make certain the socket orientation aligns with the
notch on the silkscreened legend.
