The major op amp suppliers continue to improve and update their online design tools. Here, three of the major tools will be applied to the same relatively simple 2 nd order multiple feedback (MFB) ...

RP Sallen and EL Key of the Massachusetts Institute of Technology’s Lincoln Laboratory in 1955 introduced the Sallen-Key analog filter topology. Engineering literature extensively discusses the second ...

Michael Steffes challenges conventional approaches to Sallen Key Filter design. He says today's components and VFAs offer greater flexibility. This opinion piece links to more detailed explanations.

So…The First Stage of the K2-W Op Amp is Neither Balanced Nor Differential (Part 2) Design analysis of the K2-W Vacuum Tube Op Amp’s design and operation reveals ...

Fosi Audio ZH3 DAC/Headphone Amp/Preamp offers balanced outputs, ultra-low noise, high-res support, and replaceable op-amps for $199.99. Fosi Audio has officially unveiled the ZH3, an all-in-one ...