Great stuff Scott! ? Ground loops can be a huge problem in any analog circuits and especially bad with mixed analog and digital! ?You could easily earn a PhD learning the details of this subject.
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Hello all. At David R.'s suggestion, I thought to join in the group to discuss all things CS-80.
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Please find attached a paper I pulled together to discuss the problem with some early serial numbers of the CS-80 that had a problem with pitch shifting when holding low notes and then playing high notes..
The issue was discussed in Yamaha Service Bulletin 096, but the modification I propose addresses the root cause which the mods in SB 096, while worthy, do not.
The CS-80 Yamaha Service Bulletins, including 096, can be found at the Borish Electronics web page under his Articles tab.
Thanks -
Scott in Ohio
<Yamaha CS-80 - Pitch Shift Paper.pdf>
