This project is good for learning the basic idea about electronics and its fun to do. The build is very easy to make and safe to use (no hazardous parts).
The idea about spy phone is that it looks like an ordinary phone. I made this instructable just for the spy contest (and have thousand ideas to come) . challenge in this project is to make everything small as possible. You can use in this project any phone you have (including mp3 players and everything that is small and mobile). 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. Now if you build this, i'm not responsible for any action you use this device for.
Step 1: This is what you will need:
obviously you will need an old phone(or new if it's not about cash) or a dummy phone. you will probably find an old phone from your own home/ ask your friends that do they have any or buy from Ebay, second hand store. You can find also a dummy phones from internet, google is your friend.
The components that you will need are:
The amplifier IC -TDA2822M
Few resistors- one about 30Kohms for the microphone and 4.7 ohms
four condenser- one 0.1 uF, one 10 uF and two 100 uF.
Battery (i used a phone battery because its small and easy to recharge on another phone. it has 3.7 volts and 600mAh so it will last. keep in mind that the amplifier needs only 1.8 volts to work and maxes out on 15 volts)
3.5mm audio jack
microphone (smallest that you can get)
and something to solder the parts to
and some wire
... i think that's all. use your imagination if needed
Tools that you will need:
sharp knife to cut the plastic if needed
Ps. If you have the chance. do this project to surface-mount (i'm not sure about the right word) and use the smallest parts possible.