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Or...What ABCD matrices are and why they are useful in circuit analysis.
This page guides the reader through what at first looks like tricky maths, but
with the help of readily available computer tools makes analysing complex passive
circuits quite easy.
Ring modulators have been around for a long time, first developed for telephone systems,
and now used extensively in radio telecomms, and since the 1950s also in electronic music.
up some of the history of the ring modulator since my efforts at correcting the wikipedia
page seem to upset the electronic music crowd.
Linear oscillators are readily available. But how well do they work in
musical applications? This page looks at linearity as a measure of
how well they can play notes on an exponential musical scale.
Noise in electronic circuits is usually not wanted. I put this page together
while I was designing some low noise analogue circuits and needed a quick reference
on resistor thermal noise and how it relates to op-amps.
Electronics engineers can get a bit fetishy about test equipment. I've added a page with some of my thoughts on the matter.