B ILB Components datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated circuits (ic), semiconductors. UMB datasheet, UMB pdf, UMB data sheet, datasheet, data sheet, pdf, UMC, Tone / Pulse Dialer. /15C. C3. C1. OSCI. OSCO. TONE. VSS. R3. R2. R1. R4. DP. XMITMUTE. VDD. MODE IN. C2. HK. (ii) Hand-free control. HFO. HFI. 1. 2. 3. 4. 5. 6. 7.

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This unit consists of telephone set which is present in the remote place.

(PDF) 91214B Datasheet download

On getting the ringing signal this circuit connects the master unit to the telephone line. Datasneet this transistor is forward biased and the output is obtained at the emitter of the transistor. By using the basic idea of this project we can also construct many useful systems. Started by fastline Yesterday at 8: In this type of PBEX only 12 extensions can be used. Controlling devices using switches are common. This circuit is directly connected to the telephone line.

By pressing any key in the keyboard corresponding DTMF signal is available in its output pin at pin no. By using this project we can construct the personally branched telephone exchange. When this key is pressed the output of the line decoder goes low. When the internal LED glows, the light falls on the emitter-collector junction the transistor.



The row and column frequencies are given below: Now our circuit is ready to receive any coded signal of the devices connected to the local control section from the remote control section. This is achieved by using a 5V regulated power supply from a datasgeet regulated IC Here this D flip flop is used in the toggle mode. Device status feedback unit: Will the Datasheet Help? Here this system works on tone dialing mode. The row and column frequency of this IC is as on the fig.

IC NE timer: And 3V backup Vcc for this IC is supplied by using 3.

Silan Semiconductors

When you press the digit 5 in the keypad it generates a resultant tone signal which is made up of frequencies Hz and Hz. The frequencies are chosen such that they are datasheef the harmonics of each other. This unit consists of a tri state buffer and a D flip flop.

A DTMF signal is the algebraic sum of two different audio frequencies, and can be expressed as follows: The whole circuit except the devices is assembled in a single cabinet in which the board gets fairly fitted along with power supply unit. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input dataasheet. A seven segment display has seven LEDs connected in a sequence to give a regular shape and a LED to display the dot for decimal point.

The main theme of this project is to control the devices using telephone. Or is it compulsory to use UM in the above circuit as the application example given by datasehet only? Local control section contains a telephone interface circuit, ring detector circuit, signal decoder circuit, device status check circuit, device controlling circuit, device status feedback circuit.


There is no risk for false switching.

When the output of D flip-flop goes low the base voltage drops below 0. This will keeps the output high for a 5seconds.

When the base voltage of the transistor is above 0. This circuit gives an datasheeet tone after switching ON the devices to confirm the status of the device. To participate you need to register. This is same as lifting the receiver of telephone handset hook-off state.

Silan Semiconductors – datasheet pdf

It uses same oscillator frequency used 91214n the remote section 912144b same crystal oscillator with frequency of 3. This contains one telephone line and a control unit. The ring detector circuit is built around a monostable multivibrater constructed around timer IC IC BCD – seven segment decoder: And trying to give the tone output of UM to the tel.

Its filter section uses switched capacitor technology for both the high and low group filters and for dial tone rejection. Thank you Thank you ChrisP for the datasheets.