Science Buddies: "Ask an Expert"

For my project, I am building the low power AM radio transmitter that is outlined on the science fair ideas section of this website:

https://www.sciencebuddies.org/mentorin ... ?from=Home

I have collected the parts and have assembled then using the instructions, but the transmitter does not transmit any sound. What could be the possible problem? I have checked every connection with no success.

This is my parts list:

* 1 crystal oscillators: 1 MHz
* solderless breadboard (e.g., Radio Shack 276-175),
* 1000 ohm to 8 ohm audio transformer (e.g., Radio Shack # 273-1380),
* 1/8 inch mono plug (Radio Shack # 274-286A),
* a 6 V AA battery holder (holds four batteries),
* four 1.5 V AA batteries,
* a set of alligator jumpers,
* jumper wires for breadboard.

Jakester90 wrote:For my project, I am building the low power AM radio transmitter that is outlined on the science fair ideas section of this website:

https://www.sciencebuddies.org/mentorin ... ?from=Home

I have collected the parts and have assembled then using the instructions, but the transmitter does not transmit any sound. What could be the possible problem? I have checked every connection with no success.

This is my parts list:

* 1 crystal oscillators: 1 MHz
* solderless breadboard (e.g., Radio Shack 276-175),
* 1000 ohm to 8 ohm audio transformer (e.g., Radio Shack # 273-1380),
* 1/8 inch mono plug (Radio Shack # 274-286A),
* a 6 V AA battery holder (holds four batteries),
* four 1.5 V AA batteries,
* a set of alligator jumpers,
* jumper wires for breadboard.

Hi, Jakester90!

Can you tell us a little more about what you've tried? For example, have you connected the output of yoru MP3 or other player to the input? Did you check the batteries? Do you have a meter that can be used to make voltage and resistance measurements?

Something that I have done in the past is to re-assemble the circuit using different holes in the breadboard. Sometimes the connectins inside of the breadboard are not obvious.

It's difficult to speculate on the problem you are having unless I know more about what you've done.

Thank you!