This week assignment is to build our own microphone!
Here is the LINK.
The picture below show the materials I prepared.
I try to use a wood stick instead of a straw, and used two washer to control the position.
It turned out that it didn’t work, even work with a better amplifier. Although I could listen to a little noise when I move the stick. I thought the problems are:
- the wood stick are too heavy to oscillate.
- the cover (is made of 3mm acrylic) are too heavy to work as a diaphragm.
- the coil might not long enough to generate higher electricity.
In that case, I had to change the materials as the tutorial said.
I used cardboard as a cover and coil wires round a straw. It worked!
But it generate too much noise. Maybe I need to recoil the wires and borrow a filter to get rid of the noise.
The following video shows it amplified the vibration of my cellphone.