Check out the function generators from FeelTech on Amazon or AliExpress, like the FY6900 or FY6800. They’re cheap in a flimsy plastic case, but they’re good eno

Check out the function generators from FeelTech on Amazon or AliExpress, like the FY6900 or FY6800. They’re cheap in a flimsy plastic case, but they’re good enough for many applications.