I was testing an electret mic when I noticed something strange happen.
I had the electret mic connected in the wrong way to a Common emitter amp circuit that then goes to my speakers. I noticed that I started picking up AM radio station 1650 when I would touch the mic's casing with my fingers (the casing is also the negative terminal).
I would like to know:
What is the phenomenon at work?
Can I pick up different stations?
Does the station I pick up depend on the capacitance of my body only?
Here are some more details as to what I did as well as the circuit.
The above picture is the circuit diagram the only difference is that the mic's polarity is inverted.
I also noticed that when I touched a big metal object like my computer case, the AM signal was greatly attenuated.
I had the electret mic connected in the wrong way to a Common emitter amp circuit that then goes to my speakers. I noticed that I started picking up AM radio station 1650 when I would touch the mic's casing with my fingers (the casing is also the negative terminal).
I would like to know:
What is the phenomenon at work?
Can I pick up different stations?
Does the station I pick up depend on the capacitance of my body only?
Here are some more details as to what I did as well as the circuit.
The above picture is the circuit diagram the only difference is that the mic's polarity is inverted.
I also noticed that when I touched a big metal object like my computer case, the AM signal was greatly attenuated.