MT8870 DTMF voice dialing fixed detection module learning board audio decoding module. | Обустройство дома

MT8870 DTMF voice dialing fixed detection module learning board audio decoding module. | Обустройство дома

First, it is declared that this module can not be used on the telephone link that can work normally. It can only be used as a realization learning. The power supply voltage is 8-12V DC voltage supply.
At the beginning of the module design, it is mainly used in teaching.
The voltage in the various states of the fixed phone.
Tool: CHINT electronic multimeter
Range: DC 200V
Hook to dial 8V
Off hook dial in 8V
Off hook call 8V
Hands-free dialing 10.3V
14V in hands-free dialing
14V in hands-free call
Quiet standby 54V
Call in the bell 46-54V
The voltage of switches in different areas is different. Oh, for reference only.
This module does not design the situation of waiting and entering the ring, so please don't connect the board to the normal link telephone line.
Wiring method:
The two green terminals in the diagram:
On the left side: according to the instructions on the back of the board, connect the telephone line which is plugs out on the fixed telephone. (a crystal head is inserted on the phone, and the other end is directly connected to the two terminals on the left side, regardless of the positive or negative).
On the right side: according to the instructions on the back of the board, connect 8-12V and GND, which is DC DC.
After the connection, the electricity will work properly.
This module with hook monitoring function, photographed and payment after I will send information to you!
The fixed phone keypad 1 presses the corresponding plate's lights Q1, ------Q2, -----Q3 and ------Q4, which is 1-0 -0 -0.
Fixed phone keypad 2 press the corresponding plate lights, Q1 extinguish ------Q2, light -----Q3, destroy ------Q4, that is, 0-1 -0 -0.
By analogy, the increase in the number of binary numbers.