Radioham since 1992 (G7LSZ and SA6BID), have a great love of op amp circuits, I also rather like valved RF power amps after a rather sad experience as an undergraduate.
Chemistry Academic at Chalmers University of Technology, research interets include solvent extraction and recycling.
I have an interest in simulation through the use of analouge computers which are simulated in turn in LTSpice. For example I modelled the Bill Phillips MONIAC machine in LTSPice using op amps. This was published in RadCom plus (Using op-amps to model the Phillips economic computer in SPICE, RadCom Plus, 2020, 5(1), 34.)