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-=-=-=-=-=-=-
Here are the schematics to a DTMF decoder:
-=<Parts List>=-
C1 .01uf cap S2 momentary, normally open
C2 47uf cap S3 momentary, normally closed
C3,C4 .1uf cap IC1 SSI202 DTMF decoder
R1,R3 4.7K res IC2 5101 256x4 SRAM
R2 1M res IC3 CD4070, quad XOR
R4 1K res IC4 74C93, ripple counter
LED 7segment common cathode IC5 74C48, BCD to 7-segment
X1 3.579 Mhz colorburst, HC case IC6 78L05, 5v regulator
S1,S4 SPST switch
-=<THE MAIN PC BOARD>=-
+5v
+5v +5v __|_
_______| _|_ _|||__|_
| _____|____ _____|___|___ | 345 16 | ____
|_|2 5 1|___________|9 17 22 10|_______|7 13|_a| |
|_|3 18|___________|11 12|_______|1 12|_b| L |
|_|8 S 17|___________|13 14|_______|2 11|_c| |
| S 16|___________|15 5 16|_______|6 10|_d| E |
| I | | 1 | | 9|_e| |
C1 | 2 | o__+5v | 0 | | 15|_f| D |
o__||__|9 0 4|__o _|1 1 | | 14|_g|____|
|| | 2 7|__o |_|2 S | |___8____| |
o _|14 10|__| |_|3 R | | \
| | | 15|__| |_|21 A | GND /R4
GND | |_11_____12| GND |_|18 M | \
| | R2 | |_|19 | |
| |--/\/--| |_|8 | ^ o
| | _ | | |__20___4567__| \ S4
| |_|| ||_| | | |||| o
| ||_|| GND | ||||___________ |
| X1 ___| |||__________ | GND
| +5v | ||_________ | |
| _____| | +5v |_________ | | |
| __|_____|_____ | _|_________ || | |
| | 13 14 | | | 4 | || | |
| | | _ | | | 12|_|| | |
|___|12_>)_)-----11|____| | 7 10|__| | |
|_|6__ _ | | 4 9|____| |
_|5__>)_)------4|_________|14 C 13|______|
+5v |_|3_______ | | 9 8|_|
|______|2__ _ | 9|___ | 3 |
\ ___|1__>)_)-- 8|___| | |
R1/ | |___________7__| | |_1_2____11_|
\ | | | | | |
S2 o__|__| | | | | |
^ _|_ | | +5v | | |
\ ___C2 | | | | | |
o__|__________________|______| / | | |
| \R3 | | |
GND /____|_| |
|________o<--o S3
|
GND
-=<voltage regulators>=- (optional)
^ +5v
/ _____ _|_
____o o__|78L05|____o+5v _|_ _|_
| |_____| C3 ___ ___ C4
9v | |___|
| GND |
(-) GND
For instructions and details write to: HB Technologies
PO Box 2771
Spring Valley CA 91979
enjoy---
Dispater
. . . ^
`____ + ________ __ ____ _|\ _ _ ______ __ _|\ ___
\ \ /.(__ __). | # /. // | \ \| (__ __)_ \/ | \/ /
|\/: \/ | |/ \/ | | / |_// | \ : \/ \ _/ / | \ / +
| | \ _ \\ / _ \ / | _\ : / . /\ / \ \ : /'---.
|_____/_| /_\/\__| / \___ |_\___/__| /._\/__/\ \___/____/
|/ |/ \| |/ \__/NomaD93'
: v . : ~
. '
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