Cursed circuits #5: capacitance multiplier

Electronic circuit theory is a frequent theme on this blog. As a part of this sorta-curriculum, I published a number of articles about operational amplifiers. I keep coming back to this topic for two reasons. First, I think these components are usually explained poorly, making them a major stumbling block for folks trying to learn the craft. Second, op-amps have gotten really good, inexpensive, and small, so I think they should be used more.If the component is still a mystery to you, this article is probably not the best place to start; we’ll cover the very basics, but I recommend carving out some time to go over two other write-ups from 2023:I also cover op-amp theory (and a lot more!) in The Secret Life of Circuits, a lovingly-crafted book that’s available in early access and will be hitting the shelves in about two months.Today, I’d like to talk about a circuit that didn’t make the cut for the book. It’s not nearly as useful as a transimpedance amplifier, an integrator, or a…