QUASAR CODES 3140 - DTMF Telephone Relay Switcher
Page
6
REFERENCES
Understanding Telephone Electronics
, by J. Fike &
G. Friend, published by Sams (ISBN 0-672-27018-8)
The newsgroup
sci.electronics.basics
frequently
discusses telephone related questions.
Visit
http://
www.atmel.com
for a datasheet on the
89C2051
microcontroller and 24C01 EEPROM.
MAX666 datasheet from Maxim
http://pdfserv.maxim-ic.com/arpdf/MAX663-
MAX666.pdf
LCA110 datasheet from CP Clare
http://
www.clare.com/home/pdfs.nsf/www/
Lca110.pdf/$fil
e/Lca110.pdf
PARTS LIST
Resistors (0.25W carbon film unless specified)
56R 1W green blue black .. R3 ................................. 1
100R brown black brown .. R4 ................................. 1
820R gray red brown ......... R5 ................................. 1
1K brown black red ........... R18,22 .......................... 2
2K2 red red red.................. R6 ................................. 1
8K2 gray red red ................. R21 ............................... 1
10K brown black orange ... R8,17,19,20 .................. 4
22K red red orange ............ R7 ................................. 1
47K yellow violet orange .. R1,2 .............................. 2
56K green blue orange....... R11 ............................... 1
68K blue grey orange ........ R12 ............................... 1
180K brown gray yellow ... R16 ............................... 1
220K red red yellow .......... R9,10,13 ....................... 3
270K red violet yellow ...... R14 ............................... 1
3M3 orange orange green .. R15 ............................... 1
Capacitors
27pF ceramic ...................... C12,13 .......................... 2
10nF 103 63V box poly...... C5,6 .............................. 2
100nF 104 monobloc.......... C7,8,11 ......................... 3
120nF box poly................... C3 ................................. 1
1uF 105 63V/100V poly..... C15 ............................... 1
330nF 250V poly................ C4 ................................. 1
1uF 63V electrolytic ........... C1 ................................. 1
4.7uF 63V electrolytic ........ C2 ................................. 1
10uF 25V electrolytic ......... C10,14 .......................... 2
100uF 25V electrolytic ....... C9 ................................. 1
Semiconductors
1N4004 diode ..................... D1,2,3 ........................... 3
1N4148 ............................... D4 ................................. 1
WO2 ................................... B1,2,3 ........................... 3
Diode bridge
MJE340 NPN transistor...... Q1 ................................. 1
MPSA42 NPN transistor .... Q2 ................................. 1
CM8870 datasheet from California Micro Devices
www.calmicro.com/products/data/pdf/cm8870.pdf
DTMF Decoder, in Silicon Chip, 5/91, p30.
DTMF Decoder, in Electronics Now, 11/93, p53.
Build a DTMF Decoder/Logger, in Popular Electronics,
9/95, p37.
For information about all Quasar Kits see our web page at
http://www.quasarelectronics.com
Send us email - mailto:
For technical support queries please contact our Support
Team by email:
mailto:
Semiconductors (cont.)
LCA110 opto-isolator ........IC1 ................................ 1
4N25 optocoupler ...............IC2 ................................ 1
CM8870 ..............................IC3 ................................ 1
DTMF receiver
AT89C2051-24PC ..............IC4 ................................ 1
ATMEL microcontroller
24C01A...............................IC5 ................................ 1
128x8 serial EEPROM
ULN2003A .........................IC6 ................................ 1
MAX666 .............................IC7 ................................ 1
LED, 5mm Green................L1 .................................. 1
Miscellaneous
Crystal, 3.5795MHz............Y1 ................................. 1
Crystal, 12.000MHz............Y2 ................................. 1
Metal Oxide Varistor ..........MOV ............................. 1
Socket, RJ-11 ......................X1 ................................. 1
Pluggable header.................X2 ................................. 1
12 way, Dinkle 2EHDRC-12P
DC jack, 2.5mm, PCB mtg .X3 ................................. 1
Pluggable socket .................for X2............................ 4
3 way, Dinkle 2ESDV-03P
Relay, SPDT .......................RL1,2,3,4 ...................... 4
Goodsky RWH-SH-112D
TACT pushbutton switch....S1 .................................. 1
LED clip, 5mm black ..........for L1 ............................ 1
IC socket, 20 pin .................for IC4........................... 1
IC socket, 18 pin .................for IC3........................... 1
IC socket, 16 pin .................for IC6........................... 1
IC socket, 8 pin ...................for IC5,7........................ 2
IC socket, 6 pin ...................for IC1,2........................ 2
Self tapping screws for fixing PCB to case ............... 4
Plastic case, 130(W) x 100(D) x 30(H)mm ............... 1
PCB,
3
140 ................................................................. 1
Set of front & rear panels........................................... 1