I am a science student of grade 8 and researching and learning about radio waves.
I am currently trying to make a crystal radio. The problem I am facing is the speaker I have to use for the project.
I searched on the internet regarding the same and found that there are high sensitive piezoelectric earpiece that most of the people use for crystal radios, but in my locality I could not find them.
So I also tried using piezoelectric buzzer for my project but it failed to produce sound.
what kind of speaker should I use?
Best Answer
You might try looking in old Army surplus stores. Old tube type radios used a 2000 ohm headphone. This is the type of headphone that was used on crystal radios in the past century.
The impedance is 2000 ohms, and the resistance is a bit lower. Take an ohmmeter along with you shopping so you can measure the headphone. Anything measuring from 500 to 2000 ohms could work.
You can also search online for 2000 ohm headphone.