FM transmitters broadcast signals to FM receivers. The receivers then transmit these signals through stereo or P.A. systems. Transmitters can be wireless components, or consist of attachable wires. With the ability to pick up a wide range of signals, they are highly utilized and very popular. In order to make an FM transmitter, you will need a few accessories. These items can be purchased from an electronics or hardware store. The transmitter allows you to enhance your home or office stereo system.
- Soldering iron
- Copper sheet
- Copper wire
- 9 volt battery clip
- Industrial glue
- Wire strippers
- Audio cable
- FM receiver
Assemble your FM transmitter
Cut out a 3×4 block of the copper sheet using scissors. This will be used as your circuit board. Next, cut out 5 small pieces from the same sheet. Using industrial glue, paste the pieces as desired onto the 3×4 block. This will be the base of the circuit board.
Connect the 9-volt battery clip to the copper board. Use the soldering iron to attach the black wire to the board itself. The red wire should be connected to the top copper piece on the board. Next, strip the audio cable using a wire stripper. This will expose its white and red cables. Solder the white cable onto the board itself. The red cable should be connected to the far left copper piece on the board.
Connect the resistors and capacitors onto the circuit board. Make sure the components are attached to each of the 5 small copper pieces. For details on placement, you can access the Internet for proper diagrams and schemes. Next, cut out a small piece of copper wire. This will be used as your coil. Wrap it 4 times around a pencil then remove. Straighten out its edges, and then solder it between the top and second right copper piece.
Connect the transmitter into the audio input of your FM receiver. Make sure the audio cable, which is connected to the board, is compatible with your receiver. Your FM transmitter is now ready to broadcast signals to the receiver. If desired, you can also connect the transmitter to other audio sources.
As a final step, choose a band on your FM receiver that is hard to get. If the static is replaced with decent audio, your transmitter is properly functioning. If the static ensues, simply adjust the FM transmitter’s wires to broadcast signals again.
- To maximize broadcasts, adjust the receiver’s antenna.
- Make sure your FM receiver has an accessible audio input port.
- To avoid short circuits, keep the transmitter away from other receiver wires.
- When trimming copper or audio wires, use gloves to prevent scrapes and cuts.
- Keep the soldering iron away when not in use.
- Always check FCC rules and regulations before broadcasting signals.