I have recently bought the MK136 Super Stereo Ear kit from Velleman and it works perfectly, but I have some questions about the schematics (see: http://www.vellemanusa.com/downloads/0/ ... _mk136.pdf
How does the kit work? What funtions do the different components have? I get the fact that there are two microphones and the signals from these microphones are seperatly amplified by the opamp. The amplified signal goes to the stereo jack output. But what functions do the different components have (resistors, capacitors etc)? Are they being used as a filter? What type of filter? Butterworth filter? High pass filter/low pass filter?
What type of microphones are used? Are these capacitive microphones?
Does the potmeter influence the amplification factor?
It would be nice to have some answers to these questions. Any knowledge on the subject is welcome!
Thanks in advance!