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STATECD.CK$
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1988-09-03
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******************* FILE 6 of 6 FILES **********************
(C) 31 JUL 88
Eric Gustafson, N7CL
2018 S. Avenida Planeta
Tucson, AZ 85710
DPLL Derived Data Carrier Detect (DCD)
For Filter Based and Single Chip Modems
$
Figure 1 $
$
ASCII Representation of DCD Circuit Schematic $
$
$
//=================7 wire BUS * ================\\ $
|| || $
+5 V>-----------+--+---------------+--+--+--+--+----------------+-----+ $
supply|| | +---|(---G | | | | | || __|___ | $
|| | 10uF | | | | | || | 14 | | $
|| +------+------+ +----+--+--+--+--+------+ || | | | $
|\-| 3 20 2|------|10 28 27 26 23 1 11|-/| | U3 | | $
|\-| 4 5|------| 9 12|-/| |74HC14| | $
|\-| 7 U1 6|------| 8 U2 13|-/| | | | $
|\-| 8 9|------| 7 15|-/| |__7___| | $
|\-|13 74HC374 12|------| 6 27C64 16|-/| | | $
|\-|14 15|------| 5 17|-/| G | $
\-|17 16|------| 4 18|-/ | $
DATA>----|18 11 10 1 19|------| 3 25 24 22 21 20 2 19|--/\/\/\/---+ | $
from +---+--+--+---+ +----+--+--+--+--+--+---+ 4.7K | | $
modem chip | | | | | | | | | | | $
| | | | | | | | | +----+ | $
CLK >--------+ +--+ +--+--+--+--+--+ | | $
input from | | | Q1 | Q2 $
X16 or X32 baud G G | E-+-E $
clock source | |/ 2N \| $
+-B-| 3906 |-B-+$
GND >---G |\ (2) /| |$
C-+-C |$
1N4148 | |$
DCD <--------+ +----|<|----+ +------------------+ |$
out U3D | U3C U3B | | U3A | |$
___ 8 /|9 | 6 /|5 4 /|3 | 220K | 2 /|1 | 470K |$
LED <--o< |--+--o< |--+-o< |--+--/\/\/\/--+--o< |--+--/\/\/\/--G |$
out \| \| | \| | \| | |$
___ | | 0.47uF | 0.1uF |$
DCD <-----------------+ +----|(-----G +----|(-----G |$
out 100K |$
+--/\/\/\/--G |$
| U3F |$
|13|\12 __ 10K |$
CD >--+--| >o------+------------------< CD <---------+-----/\/\/\/----------+$
from |/ | JMP1 | $
modem | (AMD7910) | $
chip | 11|\10 | $
+----| >o----------< CD <---------+ $
|/ JMP2 $
U3E (TCM3105) $
$
NOTE: Only JMP1 OR JMP2 installed NOT both! $
$
* BUS wire connections are in order $
vertically. Top pin goes to top $
pin bottom pin goes to bottom pin $
etc. $
EOT
EOF