Audio circuits
Circuits for making and testing sound. Each one works out its filter corners, gains and headroom, and says which values are ours and which come from a datasheet.
Pages in this section
Lessons behind these pages
- Noise basicsThermal, shot and flicker noise, and how each spreads over frequency.
- The decibelReading −3 dB per octave and −10 dB per decade.
- Low-pass filtersThe single RC pole that every audio filter is built from.
- Non-inverting amplifierSetting gain with two resistors.
- Op-amp limitationsGain-bandwidth and why high gain loses the treble.
- Audio amplifier ICsThe power stage a test signal usually ends up driving.