The hottest Amplifiers Substack posts right now

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Resistors are out to get ya

lcamtuf’s thing • 2652 implied HN points • 28 Nov 23
🔬 Science Electronics Components Circuits Amplifiers
  1. Some components in electronics, like resistors, may not behave exactly as expected especially at high frequencies.
  2. Parasitic impedance and capacitance in resistors can affect circuit performance, especially in applications like feedback loops for operational amplifiers.
  3. Using a two-stage amplifier can help mitigate issues caused by resistor parasitics and ensure better signal integrity.

Building a decent microphone amplifier

lcamtuf’s thing • 2856 implied HN points • 30 Mar 23
đź•ą Technology Electronics Amplifiers Circuit Design
  1. Building a good far-field microphone kit requires attention to microphone sensitivity and selecting a suitable op-amp.
  2. Creating a basic but effective circuit architecture for a microphone amplifier involves understanding current-to-voltage conversion and noise reduction techniques.
  3. To avoid issues like over-amplification and background noise, solutions such as manual gain control and automatic gain control (AGC) can be implemented in microphone amplifier circuits.

Chopper amplifiers: history and present

Only Wonder Knows • 19 implied HN points • 15 Dec 23
🔬 Science Electronics Engineering Physics Circuits Amplifiers
  1. Chopper amplifiers are a technique to reduce DC offset and low frequency noise in amplifiers.
  2. Historically, chopper amplifiers have been implemented using innovative methods like optical chopping with cadmium sulfide light-dependent resistors.
  3. Contemporary engineers can refer to Jim Williams' design for an ultrahigh performance instrumentation amplifier that resembles the old chopper amplifier concept.

Yet More On Decoupling, Part 4 – Don’t Get Into A Macromuddle!

filterwizard • 0 implied HN points • 08 Sep 24
đź•ą Technology Electronics Simulation Circuit Design Modeling Amplifiers
  1. Many op-amp simulation models don’t accurately show how they react to power supply changes. This makes it hard to trust the results from these models.
  2. Just because an op-amp is high quality doesn't mean its simulation model will behave well in tests. It's important to check each model individually.
  3. Finding a reliable op-amp model for testing took a lot of effort. Even after trying many, only a few performed as expected.
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