Notes on audio, acoustics and electronics, collected from decades of writing on personal websites and forums: circuit designs, the theory behind them, and opinion. Articles will be revised, updated or have comments added. New articles will be added as time allows.

If this site, my writing elsewhere, or something I designed has helped you and you would like to say thank you, you can buy me a highball. It is not an obligation, but it is appreciated.

Questions about repairs, old designs or design work? See the FAQ.