1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test . Integrated Circuit. Transistor Transistor Logic (TTL). 4−Line−to−16−Line Decoder /Demultiplexer. 24−Lead DIP Type Package. Description: The NTE is a. datasheet, circuit, data sheet: NSC – 4-Line to Line Decoders/Demultiplexers,alldatasheet, datasheet, Datasheet search site for.

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This output is fed to the line decoder IC Working of the monostable multivibrater already discussed. Now power supply is connected and devices are also connected so that the whole section is ready for control device using a remote telephone set.

In both the cases, the column frequency Hz is the same. Where f a and f b are two different audio frequencies dataxheet A and B as their peak amplitudes and f as the resultant DTMF signal.

This IC is used as a multivibrater click here to download datasheet. After a period of 5 seconds the output of the IC 6 goes low and puts the tri state buffer in the high impedance state.

This unit consists of telephone set which is present in the remote place. In the relay datasueet circuit resister is used to provide the necessary base current to the transistor so that it can bias properly.

The MT decoder uses a digital counting technique to determine the frequencies of the limited tones and to verify that they correspond to standard DTMF frequencies. Provision is made for connection of a feedback resistor to the op-amp output GS for gain adjustment. These tones are identical and unique.


This device status feedback unit uses a dual input AND gate, datashet output of the flip flop and the tri state buffer are to dataseet the input. Because of this here we need a BCD to seven segment decoder which gives logic low output for the respective BCD input.

So no output will be available at the output terminal. This unit is constructed using a timer chip. This all has to do with the actual ic design.

(PDF) 74154 Datasheet download

Understand, this is a typical example of application, not it’s sole purpose. This Dwtasheet is a tri state buffer contains four independent gates each of which performs a non-inverting buffer function.

Now we see these units in detail. High on the pin 3 of this timer IC biases the transistor T2 in the relay driver circuit which in tern switches ON the relay. Download the datasheet below for a more comprehensive summary. This circuit consists of some passive components like resisters, capacitors.

4 Line to 16 Line Demultiplexer / Decoder

After 60 seconds the local control unit will disconnected from the telephone line so that your money is saved. If you have some experience using Datasneet you will know that NPN transistors are best used to pull a signal to 0V common emitter, with the output connected to the collector and quite weak at pulling a signal high.

Minimal external components required include a low-cost 3. When the both inputs are high that indicates that device is switched ON, then the output of the AND gate goes logic high state. To perform any operations through remote phone line, the user needs to dial to the local telephone to which the interfacing circuit is connected then the respective code of the device is dialed.


Device Control Using Telephone:

It is nothing but remote telephone set which is present in the remote place. Above figure shows a single D-flip-flop. This is a control unit through which you can control your appliances. Since the low output of this IC the output is inverted to get logic high output. With a monostable operation, the time datassheet is controlled by one external resistor and one capacitor connected between Vcc-Discharge Rand Threshold-Ground C.

This intern switches on the relay. IC is a conventional D-flip-flop IC. Before going into detail of the circuit, we will take a brief description about integrated circuits used in local control section. While switching OFF the device this tone is not heard. This will keeps the output high for a 5seconds.

This circuit gives an acknowledgement tone after switching ON the devices to confirm the status of the device. The demultiplexing function is performed by using the 4 input lines to address the output line, datasheef data from one of the strobe inputs with the other strobe input low. The main theme of this project is to control the devices using telephone.

The actual implementation of the chosen ic has active low outputs. This is the main unit of this system. The DTMF mode is shortly called as tone dialing mode.