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When the detector recognizes the simultaneous presence of two valid tones known as signal conditionit raises the Early Steering flag ESt.

The main theme of this project is to control the devices using telephone. IC BCD – seven segment decoder. In this type 91214bb PBEX only 12 extensions can be used. For producing the appropriate signals it is necessary that a crystal oscillator of 3. The low and high group tones are separated by applying the dual-tone signal to the inputs of two 6 th order switched capacitor band pass filters with bandwidths that correspond to the bands enclosing the low and high group tones.

Silan Semiconductors – datasheet pdf

Here this D flip flop is used in the toggle mode. 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. Circuit Diagram of Local Control Section.

Each of the low and high frequency groups comprise four frequencies from the various keys present on the telephone keypad; two different frequencies, one from the high frequency group and another from the low frequency group are used to produce a DTMF signal to represent the pressed key.


If the device is already switched ON then you will hear a short duration beep tone from beep tone generator unit. In advertising board or sign board used for display the company product purpose at the road 912114b requires the focus light on the dusk time. Until you press the key the feedback tone is heard.

According to that BCD number it selects the active low output line from 1 to 16 which is decimal equivalent of the BCD number present at its input pins. When you press the digit 5 in the keypad it generates satasheet resultant tone signal which is made up of frequencies Hz and Hz.

When this key is pressed the output of the line decoder goes low. Thank you Thank you ChrisP for the datasheets. This IC gets a backup from a 9V battery. This is a control unit through which you can control your appliances. Here we use the transistors to energize the relay coil.

Before a decoded tone pair is registered, the receiver checks for valid signal duration referred to as character- recognition-condition. These signals are digital signals which are symmetrical with the sinusoidal wave.

Will the Datasheet Help? This system is divided into two sections 1: This contains one telephone line and a control unit. The row and column frequencies are given below: This system is divided into two sections, 1: By pressing the number 5 in the key pad the output tone is produced which is the resultant of addition of two frequencies, at pin no.

When the base voltage of the transistor is above 0. The signal goes to telephone datasneet and the exchange sends a ringing signal to your set through phone line. Signal limiting is performed by high gain comparators provided with hysteresis to prevent detection of unwanted low-level signals and noise. IC BCD – seven segment 991214b Next we discuss about the device control unit. 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.


Click here to register now. In this time interval the output of the tri state buffer will be the signal at its input terminal. Laser beams are harmful to mankind. The filter also incorporates notches at and Hz, providing excellent dial tone rejection. By this the device is switches Dqtasheet.

These demultiplexer are ideally suited for implementing high-performance memory decoders.

Silan Semiconductors

Thank you Thankx Sebi Forums New posts Search forums. For a better experience, please enable JavaScript in your browser before proceeding. The resultant frequency signal is called ” Dual Tone Multiple Frequency “. This circuit is useful to receive the telephone in the absence of the person.

(PDF) 91214B Datasheet download

Sebi Active Member Jun 4, The device selected from the Remote Section for control purpose, its code is displayed in this seven segment display. These tones are identical and unique. This contains one telephone line and 91214 Local Control Section. Also i’m using a microprocessor to dial different digits shorting different rows and columns The connecters are provided to all the relay switches so that the devices are connected easily.

Minimal external components required include a low-cost 3. This device saves your money. And 3V backup Vcc for this IC is supplied by using 3.