I did some changes to the wind harp preamp, some of which
Acme Fixer (see previous blog) suggested. Moving the preamp at the harp also reduced a lot of the 60hz pickup. I posted at You Tube a video of the waveform as shown by Visual Analyzer 8.
View the YouTube video
here.
Improved circuit:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGXVo69XYH5Ky_2nICVC-mlspBueig-R-5aCUdO7wuM7fbVbyI9xQulZcalS3Da_FwKDbQP-BE5l7TbPltyz8fZJCc_0pzeR_vuGwf7mnMz-R6_fdyoBjtDPXz_m1RhNfabNHg7rJdPRFd/s320/preamp4.jpg)
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