![]() ![]() These, plus some other basic laws, help intuit what most op amp circuits do (though detailed analysis sometimes comes down to specific op amp component specs). How it's connected back there determines the actual behaviour. which it can only do when there is feedback - some circuit back into the inputs. No current flows in/out of the input pins, so #1 happens via changing the output.Tries to keep two two inputs at same voltage.Most of the below is specifically about op amps. In most uses this is tamed (by not using it as an open loop) have a very high gain (think 1E4 to 1E6).Operational amplifiers are differential amplifiers of a specific design. Voltage amplifiers in that they amplify the difference between the voltages presented between their inputs (whereas transistors are current amplifiers).Differential in that they amplify the difference between the voltage at the two inputs ( + and -).The power supply lines (middle top/bottom) are often implied and omitted) This article/section is a stub - probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. Note that the + and - inputs may be swapped in schematics when it lessens line crossings. Side note: While most op amps are voltage amplifiers, there are some variants that are sensitive to current. Typically transistors, or constructions based largely on them. 3 Operational Transconductance Amplifiers (OTA).2.5.1 Power-supply rejection and decoupling (noise-related).2.2.4.3 Why use inverting versus non-inverting.2 Op amps (and differential amplifiers).The below is about electronic components that give (at least a little) more usable power than they get.įor amplifiers as in "the complex box that makes your audio go", see Electronics project notes/Audio notes - amps and speakers Sampling, reproduction, and transmission distortionsĭevice voltage and impedance, audio and otherwise.Some stuff I've messed with: Avrusb500v2 Īctuators: General actuator notes, circuit protection.Sensors: General sensor notes, voltage and current sensing It may get you started, but to be able to do anything remotely clever, follow a proper course or read a good book. ![]() It's intended to get an intuitive overview for hobbyist needs. This is for beginners and very much by a beginner / hobbyist.
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