91214B DATASHEET PDF

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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Yes here is the solution. Will the Datasheet Help? By using this IC we can construct two types of multivibrater, monostable and astable. Here is an application. You can control up to 10 devices. Now make a call to your telephone set using a remote telephone set or mobile phone.

From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches are becoming popular. The signal goes to telephone exchange and the daasheet sends a ringing signal to your set through phone line. ChrisP New Member Jun 7, Thanx a lot R. Next we discuss about the device control unit.

There is no risk for false switching.

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Datashert changing the present status of the device confirm the operation you did, here comes the unit which gives the feedback tone after switching ON any device.

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.

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Controlling devices using switches are common. Its decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. IC BCD – seven segment decoder. Potentiometer Questions Started by norbss Yesterday at Before a decoded tone pair is registered, the receiver checks for valid signal duration referred 911214b as character- recognition-condition. By using this system we can control the light from a control room or by the cell phone of the marketing person.

(PDF) 91214B Datasheet download

This gives a triggering pulse to monostable multivibrater which is build around the IC 6. A DTMF signal is the algebraic sum of two different audio frequencies, and can be expressed as follows: This circuit identifies the ringing signal sent from the telephone exchange. This IC gets a datasheeg from a 9V battery.

Here we provide a facility that tells about present status of the device. Here common anode seven segment display is used. The output of each AND gate are connected to the beep tone generator unit by using a transistor.

UMB Datasheet pdf – Tone / Pulse Dialer – UMC

Where f a and f b are two different audio frequencies with A and B as their peak amplitudes and f as the resultant DTMF signal. This 5V source is connected to all ICs and relays. Until you press the key the feedback tone is heard.

For the proper working of this local control section except the local telephone set it needs a permanent back up which gives a 5V back up datasheeet. Before going into detail of the circuit, we will take a brief description about integrated datashete used in local control section.

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Here I am using a telephone as a media, which serves main part of this system, by using home phone as a local phone and another phone, either landline or mobile phone as a remote phone. The frequencies associated with various keys on the keypad are shown in figure A. Thank you Thankx Sebi This output is fed to the line decoder IC The whole circuit except the devices is assembled in a single cabinet in which the board gets fairly fitted along with power supply unit.

This signal is sent to the local dstasheet system through telephone line via exchange.

This encoder IC requires a voltage of 3V. Laser beams are harmful to mankind.

When control signal is at low state, the outputs are held at high impedance state. A parallel connection from the telephone line is taken and connected it to telephone interfacing circuit using a DPDT switch. By varying the values of the R A and C A the ON period of the monostable multivibrater is changed according to the formula given above. This unit consists of a tri state buffer and a D flip flop.

It may be any electric or electronic appliances or devices with simple to heavy appliances. Here this circuit is designed for a period of 60 seconds.