Hello everyone,
As my college project, I have to design and build a prototype of an electrical stimulation device. I have total freedom in design, components etc. The stimulation will be provided via two electrodes, the stimulus going from one electrode through a solution who's impedance is less than 1 kOhm to the second electrode. They will be about 6 inches apart. The signal must be 0-30 Hz generated using a white noise generator and filtered using a low-pass filter with a cut-off at 30 Hz. The signal must then have an adjustable amplitude between 0 and 700 uA.
If possible, I would like to use a 10th order low-pass Buttersworth filter with a cutoff at 30 Hz as we learned about these in class, but if a different filter would acquire 0-30 Hz stochastic white noise signal easier then I am open to that. I am also unsure of how to scale the stimulus levels between 0 and 700 uA, if possible I would like to scale them linearly from 0, +-100 uA, +-200 uA, +-300 uA all the way to +-700uA.
I have been looking into the circuitry for each step, a white noise generator circuit, Buttersworth filter circuit etc and I think I will take the project in steps like that. I am unsure how to combine them though.
Any help at all on the steps I should take, circuit design etc is truly appreciated. Thanks!
As my college project, I have to design and build a prototype of an electrical stimulation device. I have total freedom in design, components etc. The stimulation will be provided via two electrodes, the stimulus going from one electrode through a solution who's impedance is less than 1 kOhm to the second electrode. They will be about 6 inches apart. The signal must be 0-30 Hz generated using a white noise generator and filtered using a low-pass filter with a cut-off at 30 Hz. The signal must then have an adjustable amplitude between 0 and 700 uA.
If possible, I would like to use a 10th order low-pass Buttersworth filter with a cutoff at 30 Hz as we learned about these in class, but if a different filter would acquire 0-30 Hz stochastic white noise signal easier then I am open to that. I am also unsure of how to scale the stimulus levels between 0 and 700 uA, if possible I would like to scale them linearly from 0, +-100 uA, +-200 uA, +-300 uA all the way to +-700uA.
I have been looking into the circuitry for each step, a white noise generator circuit, Buttersworth filter circuit etc and I think I will take the project in steps like that. I am unsure how to combine them though.
Any help at all on the steps I should take, circuit design etc is truly appreciated. Thanks!