CRYSTALS
Install all five 11.000 MHz crystals, X1 through X5
[ ] X1
[ } X2
[ ] X3
[ ] X4
[ ] X5
SEMICONDUCTORS
Locate the 8-pin DIP IC socket. Install it in the U4 position, making certain to
align the polarity notch of the socket with the mark on the PC board, facing the
left side of the board.
[ ] 8-pin DIP socket U4
Identify and install the following components. Be certain that their polarity is
correct, and that they match the board silkscreen symbols.
Transistor Q8 requires a heat sink, included in the kit. Install the heat sink prior
to installing Q8 on the board.
√
Ref
Value
Description
D1
1N914
Glass diode
D2
SA15
Surge suppressor
U2
78M05
5v regulator, TO-220
U1
74HC240
Octal Inverter, DIP-
20
U3
TL072
Dual OpAmp, DIP-8
U4
PIC12F609
Counter IC
Q1
2N3904
TO-92
Q2
2N3904
“
Q5
2N3904
“
Q10
2N3904
“
Q12
2N3904
“
