Difference between revisions of "Electronics Formulas"
(Created page with "I'm going to try to keep some useful (but still practical) formulas for electronics here. ===List=== ==High or Low Pass Filter== 1/2πRC <math>E=mc^2</math> Category:onli...") |
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===List=== | ===List=== | ||
| + | Todo: enable math extension. | ||
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==High or Low Pass Filter== | ==High or Low Pass Filter== | ||
| − | 1 | + | 1 over 2πRC |
| − | + | ||
| + | If you know your resistor (i.e. use a standard value, say 10k, 100k) you can reverse calculate the desired capacitance easily. Some of these values can be more or less memorized if you do this enough, given that a 2πR with R being a factor of 10 will always be 2π to some decimal point. That leaves the capacitance as the only variable. | ||
| + | [[File:Formula for high or low pass filter.png|||]] | ||
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| + | ==THD from an Oscilloscope FFT function== | ||
| + | * https://www.youtube.com/watch?v=s_cVP5gu4SY | ||
| + | To recap, in this video he has a DUT that he is checking how it changes the input from a function gen, by outputting to the FFT mode of the scope, counting the dBc between the first fundamental and each following harmonic, and then doing some math to calculate the result. He also compares the result to test equipment that has a THD mode. If you have a scope w/FFT and a DUT that you need to check the THD of (and the noise is simple enough) this video may help. | ||
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[[Category:online_notes]] | [[Category:online_notes]] | ||
Revision as of 02:10, 16 February 2025
I'm going to try to keep some useful (but still practical) formulas for electronics here.
List
Todo: enable math extension.
High or Low Pass Filter
1 over 2πRC
If you know your resistor (i.e. use a standard value, say 10k, 100k) you can reverse calculate the desired capacitance easily. Some of these values can be more or less memorized if you do this enough, given that a 2πR with R being a factor of 10 will always be 2π to some decimal point. That leaves the capacitance as the only variable.
THD from an Oscilloscope FFT function
To recap, in this video he has a DUT that he is checking how it changes the input from a function gen, by outputting to the FFT mode of the scope, counting the dBc between the first fundamental and each following harmonic, and then doing some math to calculate the result. He also compares the result to test equipment that has a THD mode. If you have a scope w/FFT and a DUT that you need to check the THD of (and the noise is simple enough) this video may help.
