I am having some trouble to use the microphone electronic brick in with a lilypad board powered via a 3.3v ftdi basic usb cable.
First, I tried to get some microphone signal using PWR, GND and a analog input from the lilypad board. It seems that is there is no connection, no signal, like an open circuit. Nothing changes if a change VR1(microphone board) position.
Also I tried to supply 5V directly to microphone board, using a 9v battery and 7805 regulator. Nothing changes.
how to test this microphone board?
where is the datasheet of this brick?
Any ideas are welcome