PHONE DIALER ACCREDITED PP.TT.

SINCLAIR is an one channel PHONE DIALER, able to send, on the commuted phone line, the alarm messages previously recorded to the NOT volatile DAST memory, to the set numbers, previously saved on the NOT volatile EEPROM memory. Moreover it introduces a very important characteristic, the RING DETECTOR

A method used by the burglar in order “to block” the telephone dialer is the following: They find out the phone number of the dwelling they want to rob, then, an accomplice calls the number, while the other commits the infraction. In the moment in which the alarm system finds the intrusion, the dialer is connected to the line in order to make the alarm call… BUT instead calling, IT ANSWERS to the received call (RING) that the accomplice is making! The result: A communication is establish that can last the entire time of the theft rendering useless the installed device!!

WITH THE RING DETECTOR THIS IS NOT POSSIBLE ANYMORE
In fact SINCLAIR, in case of alarm, controls if there is an incoming call (RING), if affirmative, does NOT keep busy the line, but waits the conclusion of the incoming call (if there is NO answer the call ends after 40 sec.). Even it will be tried again to call the phone number, SINCLAIR will be however faster to take the line, engaging it, to this point, with the ALARM CALL!

The apparatus has been accredited some years ago, the only difficulty met was in the BURST, easy resolved eliminating a CONDENSER that I had put between MASS and EARTH (in order to experience the effectiveness….)

Schematic

Schematic:

Telephone interface with Ring Detector realized with the TS117 that is also occupying to couple the line (HOOK). A particular attention has been given to the protections. After a first GAS discharger primary protection (towards EARTH), we have a faster secondary protection TRISIL and then the classics 2 DIODE in anti-parallel. The rele, the optisolator and the TS117 guarantee also the necessary isolation to the several tests of homologation.

In some SAFETY fairs I have seen phone dialers of the respectable --- (I will not say the name) with homologation certificate, when, giving a glance (as a good planner) to the card, they were obvious a BUNDLE of tracks passing under the otpo isolators.....excuse the vent!

The PULSE command, at last, takes us to the times of the product realization.... Besides DTMF, the composition of the telephone number, happens also for impulse (PULSE)

In this page of the schematic you can notice the connection with the 7 SEGMENTS DISPLAY through the serial registry 4094, then all the analogical part that takes care of the RECORDING/REPRODUCTION of the audio signal (the alarm message). This part has been realized with an integrated ISD DAST that, through the node (R30,R31) brings the signal to a first filter (U5B) and then to a second filter with the Vref slightly moved towards the bottom in order to increase dynamics (we are working with the feedings of the op-amp from 0 to 5V).
To the node (R30,R31) ends also the DTMF signal coming from the EFG71891 generator.
While the signal coming from the BOURNS transformer is being filtered by U5C and "squared" by U5D for being presented in the correct shape to the Micro PIC, through the signal TONE/IN.

Here we have the PIC Microcontroller, the NOT volatile memory EEPROM 24C01 where the phone numbers will be saved and the various settings. Finally the keyboard 4X4 (16 keys) read to matrix.

Part List

COMBINATORE TELEFONICO A SINTESI VOCALE SINCLAIR RevA
Bill Of Materials
Item	Qty	Reference	Part
1	3	C1,C8,C15	100uF
2	8	C2,C3,C12,C13,C24,C25,C26,C32	10nF
3	1	C4	10uF
4	4	C5,C11,C20,C33	1nF
5	5	C6,C7,C19,C31,C35	220nF
6	2	C9,C10	15pF
7	1	C14	22uF
8	1	C16	1uF
9	4	C17,C18,C27,C29	100nF
10	1	C21	4.7uF
11	2	C22,C23	22nF
12	1	C28	330pF
13	1	C30	470nF
14	1	C36	100pF
15	1	DB1	BRIDGE 1A
16	3	DZ1,DZ2,DZ5	ZENER 18V 1W
17	2	DZ3,DZ4	ZENER 5V1
18	2	D1,D2	DIODE 4001
19	2	D3,D4	DIODE 1N4148
20	2	EF1,EF2	EMI FILTER
21	1	F1	FUSE RXE040
22	1	IC1	78L05
23	1	JP1	AK100
24	1	JP2	HEADER 2
25	1	JP3	HEADER 5
26	2	J1,J2	CON8
27	1	K1	RELE TRK22
28	1	K2	RELE TRK12
29	1	OP1	4N29
30	5	Q1,Q2,Q3,Q4,Q5	BC547
31	15	R3,R4,R13,R16,R19,R24,R25,R27, R29,R30,R34,R36,R40,R51,R52	10K
32	3	R18,R32,R33	4K7
33	1	R5	10
34	2	R6,R7	100
35	7	R8,R9,R20,R21,R22,R23,R26	1K
36	2	R10,R17	470
37	1	R11	33 1/2W
38	1	R12	220
39	2	R14,R42	1K2
40	3	R2,R15,R53	47K
41	3	R28,R41,R55	470K
42	1	R31	15K
43	1	R35	12K
44	1	R37	56K
45	1	R38	330
46	2	R1,R39	100K
47	8	R43,R44,R45,R46,R47,R48,R49,R50	680
48	1	R54	390K
49	1	SK1	GAS TUBE 3PIN
50	1	SP1	SPEAKER 8 OHM
51	2	TRIS1,TRAN1	TRISIL
52	1	T1	TRANSFORMER BOURNS
53	1	U1	TS117
54	1	U2	PIC16C64
55	1	U3	24C01
56	1	U4	4094
57	1	U5	LM324
58	1	U6	EFG71891
59	1	U7	ISD1020
60	1	X1	MICROPHONE WM54BY
61	1	Y1	CRYSTAL 4MHZ
62	1	Y2	CRYSTAL 3.579 MHZ

Printed circuit PCB

Component side tracks (TOP). In the center the plans of mass for 2 quartzes..

Track weldings side (BOT). To be noticed the EARTH track for the telephone line with the 4 points on the income connections in order to discharge eventual extratensions. Moreover the telephone interface is completely isolated from the rest of the circuit (zone up on the left)

Assembly plan (SST). Side component TRADITIONAL

Assembly plan (SSB). Side component SMD

Download the instructions --->> sinclair_man.pdf

For HOBBY use:

You can find the schematics in the DOWNLOAD section (for access you have to be registered)

For PROFESSIONAL use:

The complete firmware plan ASM source and GERBER files
for the realization of your SINCLAIR DemoBoard (accredited telephone dialer) can be found here --->> sinclair_full.zip