simple mobile detector circuit using  CA3130 op-amp

description source:   http://www.electroschematics.com/1035/mobile-bug-detector-sniffer/

This handy mobile  phone detector  can sense the presence of an activated mobile cellphone from a distance of one and-a-half metre. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorized video transmission.

The circuit can detect both the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode. The moment the mobile  phone detector detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases.

Step 1: components

components list

1, CA3130  - op-amp 
2, PCB
3, Resistors all 1/4W ,
    1.2M Ohm - 1
     2.2M Ohm -1
     1K Ohm -1
     100K Ohm - 1
4, Capacitors
     22 pf ceramic -3
     0.22uf ceramic -1
     0.1 uf  polyester/ceramic -1
    100uF/25V  Electrolytic  -1
5, Red LED -1
6, BC548 -1
7, 5Cm copper wire -1



<p>I would like to ask where is that brown wire connected to. </p>
<p>where is that wire connected to</p>
<p>it's not an antenna ,output from mobile detector circuit.<br><br></p>
Is it going to detect on basic cell activation or smartphones aswell.<br><br>#admin
how much the length of anthena
<p>NC pin (no connection)</p>
It's antenna....
<p>Thanks you</p>
Please help I have made a cell phone detector but the buzzer or led just keeps glowing
Please help I have made a cell phone detector but the buzzer or led just keeps glowing
<p>Hi, Will this detect phone signal basestations and towers (in the absence of a phone) too?</p>
Can we operate it at 9 v<br>
Yes it worked :-D
<p>Hye,,, Plx Help me, my project is not working. Reply me I am waiting</p>
Hi Momykhan, <br>Firstly check if you have correctly made the circuit and all the components are working, also try using a newer IC and the swap the other electrical components, If it still does not work then, I Guess the problem might be with the Cell Phone that you may have used, The circuit basically detects only 2G spectrum and not 3G or 4G. Try using a 2G phone and if still doesn&rsquo;t work then try using a different service provider.<br>Alternating try using this circuit, https://www.seattleu.edu/scieng/ece/laboratory/cellphone/ , this circuit can detect 3G spectrum as well.<br>Hope this helps you.
<p>Thanks aloottt,,,</p>
I have mounted all components of mobile detector on bread board and am fail to detect the mobile. As per your advice i have used 2G mobile. Will you please say me which antenna should i use in circuit. And where am i wrong in please please
Nice work
<p>Can I use LM386 IC</p>
<p>It did work but not well as the circuit displayed here is half and incomplete.</p><p>Here is the link to the full circuit which has 555 Timer IC and buzzer as well along with some other components. Only then it worked with full compliance.</p><p>Good luck and I thinik that one should not mislead people. </p><p>Just look at the circuit and then read the description of the project in this instructable, you will come to know why I am saying this.</p><p>Here is the link:</p><p><a href="http://www.electroschematics.com/1035/mobile-bug-detector-sniffer/" rel="nofollow">http://www.electroschematics.com/1035/mobile-bug-d...</a></p><p>Check it out yourself.</p>
hello... how to make led light become more bright
Hi jestin i need pdf fomat of this project plz
<p>hello can i ask how much the length of anthena should be use help me</p>
<p>how much the length of anthena should be use in this project </p><p>admin please help me i need your help</p>
<p>what the type simulation i can use for this project</p>
<p>hi </p>
<p>Insted of using 12v shall v use 9v</p>
<p>can i please get the breadboard equivalent for the given connection</p>
<p>can i please get the bread board equivalent for the given connecton</p>
<p>hello friend, how long (distance) the circuit will detected the signal between the circuit and mobile phone</p>
<p>ye project kam bhi krta h ky...</p>
Does this detect signals from smartphone.. 4g LTE? Also when I connected a battery the led stays on constantly.. Any solution?
<p>will this circuit be able to detect 4G signals ?</p>
It's not working man<br>after lots of troubleshooting <br>really disappointed me....
<p>bhai ye project bna liya ky .................................ye kam krta h ya nhi</p>
<p>It detects only the signals from basic models.why it is not detecting the signals from smartphones???</p>
<p>This circuit detects simple mobile phones but not the smartphone. Furthermore this circuit detects the transmission and reception frequency of mobile phones that ranges from 0.9 to 3 GHz. Then what is the Tx/Rx frequency of smartphones?</p>
How can i increase frequency range?
<p>Also if i want to make this circuit compact, can i use SMD components ? will the frequency range and sensitivity be affected if i do so ?</p>
<p>connecting buzzer and R4 parallel?????? or replace R4 by buzzer..</p><p>plz reply fast</p>
<p><strong>CA3130 is not available. Can I use CA3140?</strong> Or could you please suggest another replacement for that component? Another thing, is it really necessary to use ceramic capacitors than the other types? Please respond. ASAP. </p>
<p>show me the full diagram</p>
circuit diagram
<p>if we are connecting buzzer like above then is there any need of 1k R in circuit?</p><p>please reply</p>
<p>Where to connect the buzzer ?</p><p>can someone please upload a circuit diagram including buzzer</p>

About This Instructable




Bio: embedded system enthusiast ...
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