Amazon is currently running some major markdowns on Beats products, with prices on multiple editions of its bluetooth wireless and noise canceling headphones slashed by over 50%. Boasting features ...

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Jan 2018: We changed C1=1uF to C1=5uF. It turned out that the Auxiliary Op Amp integrator still has sufficient gain to cause closed looppeaking of up to 10dB at or about 40Hz turning into a 40Hz ...