Mobile incoming call indicator
Description.
This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated.
When a call is coming to the mobile phone, the transmitter inside it becomes activated. The frequency of the transmitter is around 900MHz.The coil L1 picks up these oscillations by induction and feds it to the base of Q1. This makes the transistor Q1 activated.Since the Collector of Q1 is connected to the pin 2 of IC1 (NE555) , the IC1 is triggered to make the LED connected at its output pin (pin 3) to blink. The blinking of the LED is the indication of incoming call.
Circuit diagram with Parts list.
Notes.
- The coil L1 can be made by making 150 turns of 36 SWG enameled copper wire on a 5mm dia plastic former.Or you can purchase a 10 uH coil from shop if available.
- The circuit can be powered from a 6V battery.
- Assemble the circuit on a good quality PCB.
- C1 & C3 are to be polyester capacitors.
- The electrolytic capacitor C2 must be rated 10V.
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please give me full construction and working of Mobile incoming call indicator with ckt and please tell me that this works or not thnx
hello every one……..
i am gonna do “mobile incoming call indicator ” as my own mini project,and i already buy the components in order to reconstruct the circuit as soon as possible …….i need your help as well to offer me circuit simulation + circuit analysis electronically and any other information if it’s available in next four days, would you please help me???? if so, contact me through (abuamer.hala@yahoo.com)
looking forward to hear from you soon
thank you
Sir, what will i substitute to the polyster capacitors if it is not available? can i use mylar or ceramic? and also can i use 50V?
In our place. Polyester is not available can i use ceramic?
Dear circuitstoday team your all projects are very excellent and greats i am using your all circuits here is some mistakes are avilbale kindly find that your some mistakes but i belive that your team working is excellents thnks
Regards
Naeem Ashraf
Sir can I get to know about how to solder mobile headphone’s(Earphone’s) jack?
Mine is not working and i want to know the reason behind improper working by them…..Also I want to experience with it….Mine is showing some of its wires…But they are too small to be soldered…..So please give me some clue about how to do it…..!
Hey,I hav did the circuit as it is in the circuit diagram,bt the prblm is that LED is glowing continously nd thr is no blinking…. Please help me to do it……
Hey!!!…i tried winding the 28 SWG on a coke can with 200 turns…but the LED isnt lighting!!!…can u help me out???…lso do i have to remove the can before its connected to the circuit???…
can i make this circuit on the bread board ???????????????
Hi Sandeep you can use BA148. the problem may be some thing else.
i ve made the circuit, but it s not workin properly…
can i replace that IN5819 diode by any other diodes???
please help me..
Hi Charles Connect 470 ohms between anode of LED and positive supply. The LED will be glowing steadily. with incomming call to your mobile it will start flashing.
100nF is 0.1uF. check in the following site.
http://cgi.ebay.com/WIMA-MKS4-Polypropylene-Film-Cap-100nF-100V-10PCS-/270323545396#ht_500wt_715
Hi am doing the project of cell phone detector but the LED is blink without turning off and any body who can help me the capacitor picture of 100nf
nop…just 2 volts across Led… i think there should b some mistake in cct diagram shown, coz with the diode Led get the supply, n starts blowing… may be thats the rezn !!!
Hi Sweet Boy you might have blown your LED, with 5.3 volt appearing across LED?
dear admin, i ve made the circuit, but problem is that, LED continously illuminates as DC source is connected..plz let me know how to over come this problem.
I would a appreciate if you could publish the circuit about GSM control relay or SMS control relay.
prease give me the details of this project I’m so impresed to it.
Hi Anshul you may see the samples in the following site.
http://www.coilws.com/index.php?main_page=index&cPath=208_212_231
Hi Anshul You have to use a coil as explained in the notes for L1, as it has to pickup stray rf field.
Radial inductors (radial leaded inductors) will have the leads comming from one side of the bobin hence can be inserted to PCB directly. axial leaded inductors the leads have to be bent by 90 deg to insert into the PCB.
Can i use inductor in place of coil.
What is Radial Inductor? & what is chock?
is ur circuit work
dear ADMIN, It looks like a mistake in the circuit. with the diode connected the LED will get a supply of 5.6volt from a 6volt battery directly. LED may get destroyed immedeately. The diode can be deleted or the supply voltage can be reduced to 1.5volt with a 7555 cmos timer. with pulsed 3 volt the led can blink.
Could “D1″ be a 1N4148? Thanks