I'm thinking of building a front end for a PC Oscope. Some info and ideas can be found in the AAC eBook at http://www.allaboutcircuits.com/vol_6/chpt_4/13.html . I'm thinking of something a bit more comprehensive and complex, for basic amplitude, gain control, and input protection for the stereo input of the PC. Ultimately I will add this to my blog.
My first thought is input protection. What is the maximum input a PC stereo input can take and be safe? If it is around ±½V then I could use to regular diodes back to back, otherwise two zeners back to back might work.
I'm also thinking of a simple 555 calibration circuit for peak to peak calibrations.
A basic PC Oscope package and my current graphics files can be downloaded here.
Ideas anyone?
My first thought is input protection. What is the maximum input a PC stereo input can take and be safe? If it is around ±½V then I could use to regular diodes back to back, otherwise two zeners back to back might work.
I'm also thinking of a simple 555 calibration circuit for peak to peak calibrations.
A basic PC Oscope package and my current graphics files can be downloaded here.
Ideas anyone?
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