I am a retired teachers looking at Voice Stress Analysis as a hbby. I need a competent circuit designer, professional or amatuer to design and build a fairly simple test board for me. Naturally, I will be prepared to pay any reasonable price for this work. In the first instance, please contact me with a price quote to produce a working prototype board as follows.
The board would have a European female telephone input socket. The telephone input signal would be divided into two streams.
- One stream would be passed through to a short lead terminating in a male European telephone plug which could be connected to a standard telephone, so completing a normal telephone line.
- The second stream would be directed through a lowpass filter with a fairly sharp cut off frequency of 12 Hz. The dominant frequency passing though the filter would be displayed on an LED array or bar which would approximately show the dominant frequency in the 0 to 12 Hz range. The device should be powered by a 9V battery and appropriate terminals for such a battery should be included.
I am advised that this is not a highly complex circuit for any competent engineer and would appreciate anyone with the appropriate skills, advising me of their charge for this service and also letting me know somethings of their credentials, experience etc.
Eddie Carron