Gemini* and Gopher

• Personal/Opinions

  • Purple Yarrow (publ. 2025-07-28)

    Yesterday (2025-07-27) by the church parking lot, my wife and I found some purple-colored yarrow. By "purple", it is what I usually refer to as "dark pink", but maybe should be called magenta. My wife called it "mauve", which is a color name I was not familiar with.

  • Korean banchan recipes 1: Kongnamul Muchim

    Kongnamul Muchim (콩나물 무침) is a very common banchan. It's a staple of Korean cuisine. It is healthy, cheap and easy to make. You can even sprout your own soybeans if you like.

  • bedroom pages

• Science

  • Understanding Op Amps (publ. 2025-07-28)

    I've been trying to better understand if/how electronic analog models are affected by amplitude dampening or growth effects that are not explicitly part of the model. E.g., the differential equation y'' = - y, should give you a stable sinusoid. But when implemented on an electronic analog computer, the wave will either grow or diminish in amplitude. On my system, it seems that with the larger feedback capacitors, such as 1uF, the signal will rapidly diminish. But with the smaller ones, such as 10nF, the signal will rapidly grow.