Step 3: Building the circuit

First about the TDA2822M chip:

The TDA2822M is a monolithic integrated circuit in
8 lead Minidip package. It is intended for use as
dual audio power amplifier in portable cassette
players and radios.
very handy chip in use and low cost

In this project its only one channel (mono) because i didn't have the room to add few capasitators more. the audio jack makes it for the both channels but from the chip its only on one channel (you can make stereo by using both channels and using two microphones or bridge the channels)

Now when you have the circuit board ready. start soldering the parts on to it by copying the layout from picture 3 (if you have something to say about the layout please do say it. i'm not perfect about it and it might have lots of work to do about it, but for me it works just fine).
In the layout at the speaker part you put the audio jack.

Remember to fit the circuit to the phone after every added component that it fits in the phone.
<p>that is cool</p>
<p>do they work</p>
<p>Can a smartphone be used instead and do this by software?</p>
Sure. Why not? This is a example how to do it with basic electronic components. ie. how to make a amplifier.
can`t understand how to use it ? how is it work ??
<p>Well. It amplifys the sounds around you so you can hear much better. For in this project the headline &quot;Spy Phone&quot; should say something.</p>
can you tells us which pins of the TDA2822 you used in the circuit ? the numbers of the pins. thank you :)
The pin numbers can be seen in the datasheet. just google tda2822 datasheet.
Will do :) thanks for the instructable, I plan to try it out in the not so distant future.
nice one but what is it do?
amplifying the sound around you so you can hear anything clearly and things that you wouldn't hear with normal hearing. &quot;The thing about the phone is that is actually a super sensitive hearing device that you can use everywhere and no one will ever know what you hear.&quot; Read the damn thing and then ask questions.
you didnt had to be rude....its all electronic ( I read all the post but its to much electronics hehehe) reaally really nice post! I`m thinkings seriusly to start learning electronic . If I do I`ll definitly try these one !
The best way to start learning about electronics is to buy a toy electronics test board (the kind they sell at toy stores). Its the best and easyest way to start learning electronics because if you screw up you can easily start again (i always try my builds on the same kind of board before soldering to see if it works). so no soldering there. When you &quot;master&quot; that and think you can go to the next level. try soldering. just solder random components to a breadboard or something like that or try to build something to the board you have allready build on the toy test board. <br>You will need: <br>decent multimeter. just for measuring voltages etc. and learn that way the use of it. and has got hell lot of information in the future. <br>Soldering stuff. don't buy the cheapest you will find. its just pain in the ass. buy something you can change the temperature of the solderer(don't know if a real word.) <br>And open mind for anything <br>Remember. Start small and go big. <br> <br>and remember also. when you get the idea of the components and the idea of electronics. its time to try programming the electronics. if you want i can send you a picture of 8-bit Attiny 2313 test and programming board (yea. you can do knight rider lights with that... so Nothing cool really ;) )
The part you referred to as a &quot;condenser&quot; is actually called a capacitor.
&quot;Condenser&quot; is the old name for a capacitor.
sorry. bad english
Its called Surface Mount Device SMD. Very neet instructable thow. <br> <br>
thanks. i will correct that when i get the chance :) i just happened to have some kind of brain fart and didn't remember anything... thanks for the reply!
My phone has a &quot;voice recorder&quot; mode. If I activate that, it will record everything just fine, no mods needed!
but not cool. every phone has got that mode. And you wont hear things in real time
and amplified volume
I love the fake skin from the battery screen! that's genius!
This seems like the best thing ever to make!!! Can you do it with any kind of phone? And where do I get the supplies? I have never made anything like this before, and I have no idea what a resistor or a condenser! Can u make a video please? Thnx for reading am comment!
Don't worry about me voting for you, cuz I just did. You are awesome to come up with this cuz i could have soooo much fun with this!!! THANK YOU!!!!! <br>&eth;Ÿ˜œ
yes. you can do it with any kind of phone. just make sure there is enough space inside the phone to put the circuit into. You can also try to put the circuit first into something bigger like inside a box or something than a phone. <br>Try to find the parts from here: <br>http://www.radioshack.com/category/index.jsp?categoryId=2032230 <br>OR <br>Try your local electronics store.(they will be happy to help you and to make sure you get the right parts.) <br> <br>This is perfect project to do with your mom or dad or with friends <br> <br>Also you will need soldering iron (any kind will do) and soldering tin <br> <br>the parts are: <br>amplifier IC -TDA2822M x1 <br>30Kohm resistor x1 ( the ohm is the basic resistanse of the resistor) <br>4.7ohm resistor x1 <br>100 uF condenser x2 (the u is micro and the F is Farad) <br>10 uF condenser x1 <br>0.1 uF condenser x1(the voltages about condensers does not matter much in this kind of project. try to keep them over 16 volts) <br>and some breadboard <br> <br>Try wikipedia for learning about Amplifier IC, resistors and condenser. They are simply to use and simply to learn. and if you learn it your self you will remember it always! <br>I will not make a video about this project, but maybe in the future. <br>Happy building <br>If you have any questions just ask! <br>make sure you pressed the vote button in the upper right corner for Spy consest ;)
Great! Can I have more info on the specs of the condenser and transistors? Voltage and such? I'm new to this and don't want to risk messing up.
sure. keep the condensers over 16 volts and the resistors 1/4W and you will be fine. the circuit does not use big amps or voltages so there is no hazardous parts included. be careful with the amplifier to not to brake it (for short circuits and heating it too much with soldering iron). this is a good projeckt to start learning about electronics :)
Thanks! <br>
Love It 4 stars! <br>But alas, I am going to vote for one of my entries. Sorry!
damn :D
Comment and rate!! also vote for spy contest when its available to vote

About This Instructable




Bio: I am 26 years old engineering student from Oulu in Finland. Currently living in Joensuu. I make these projects as a hobby, and it would ... More »
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