Analog Electronics

From identifying components to how analog circuits behave — amplification and gain, the filters that shape signals by frequency, feedback, signal conditioning, and the failure modes that make analog stages misbehave.

• 5.1Amplifier FundamentalsWhat amplification really is — gain, decibels, bandwidth, and the amplifier classes — the analog idea behind everything from a microphone preamp to a speaker driver.IntermediateLow Risk26 min read
• 5.2Filter Circuits — Low-Pass, High-Pass, Band-PassShaping a signal by frequency — the four filter types, the cutoff frequency fc = 1 ÷ (2πRC), roll-off, and passive versus active filters, all built from the reactance you already know.IntermediateLow Risk26 min read
• 5.3Feedback SystemsFeeding the output back to the input — how negative feedback buys stability and precision, how positive feedback makes oscillators and snap-action, and how both shape every amplifier and control loop.IntermediateLow Risk26 min read
• 5.4Signal Conditioning CircuitsTurning a raw sensor signal into something usable — buffering, amplifying, filtering, level-shifting, and protecting it, the whole analog toolkit working as one chain into a converter.IntermediateLow Risk26 min read
• 5.5Common Analog Failure ModesHow analog circuits actually break — drift, noise, distortion, oscillation, dead stages, and intermittents — and the signal-tracing method that turns a vague symptom into a named, localized fault.IntermediateLow Risk26 min read
• Chapter Quiz40questions · 80% required to continue