Hi! Did you ever thought that you can build many gagdets from an old electronic device? Yes, maybe. Now I'll show you that what can build from an old casette player/radio. I made an FM transmitter bug and a wind turbine battery charger. The most of the parts are from the casette player. I only needed a 9v battery, a propeller and a AA battery holder. The wind turbine is the easiest project that I've ever made I think because the circuit only requires the 6v DC motor from the casette player and a diode from the circuit.

The FM transmitter is a little bit harder project but works fine. Now let's begin!

Step 1: Parts and Tools

For these projects you'll need only the casette player, soldering iron and some crafting tools.

Step 2: Salvaging Components

Open your casette player or radio then take out as much electronic components that you can. I've found inside a bad speaker :-( , but the other components were good. Removed capacitors and and te resistors. Then I found inside a microphone. These parts are perfect to make an FM transmitter from them. And the 6v DC motor is also perfect for a wind turbine.

Step 3: FM Transmitter

So you'll need :

-a BC547 transitor
-1nF and 22nF capacitor
-4.7pF and 20pF capacitor
-a coil with 4 turns-a small piece of PCB
-9v battery clip
-wire for the antenna
-4.7k and 330ohm resistors

Step 4: Heat Up Your Soldering Iron

Following the circuit diagramm make the circuit on a small piece of PCB. Add the 9v clip and the antenna then you're done.Add the 9v battery and test it with your phone's FM radio or with an FM reciever. If don't works try to modify the antenna's position until you'll get the chanell.

Step 5: Test It!

But what is a FM transmitter?

Is a device that can amplify the microphone signals and transmitts frequency modulated signals via radio waves to your phone or to a reciewer. Works between 90 and 106mHz. My one was 97.8.

Step 6: The Wind Turbine

You'll need the DC motor, a water bottle a germanium diode from the circuit of the casette player, a propeller and a AA nattery holder. That's all! The simplest wind turbine on the world.

Step 7: Soldering

Solder the motor and battery together but add the diode between the positive wires. The anode needs to be connected to the motor's positive output and the catode to the battery's positive wire. This is very easy.