Electronics > Beginners
converting Volt into dB
schmitt trigger:
Indeed, one can use decibels for many purposes. Many prepostperous.
In my previous job, since it was a public company, the CEO's compensation was available.
As a prank, we started calculating how many decibel dollars (dB$) our pay compared to the CEO's compensation.
Because it was purchasing POWER, it was calculated as: 10log(my$/$CEO$)
Of course, the results were always negative :-DD
soldar:
--- Quote from: bob91343 on August 09, 2019, 04:38:26 pm --- I reiterate that decibels are a measure of power ratio. Any other use is perversion.
--- End quote ---
Can we have a cite for that? Because Wikipedia disagrees and cites ISO 80000-3:2006.
--- Quote ---https://en.wikipedia.org/wiki/Decibel
In the International System of Quantities, the decibel is defined as a unit of measurement for quantities of type level or level difference, which are defined as the logarithm of the ratio of power- or field-type quantities.
--- End quote ---
Audioguru again:
The voltage gain of opamps is measured in decibels.
The voltage gain of audio power amplifiers is measured in decibels.
The voltage cutoff frequency of a filter is measured at -3dB.
The voltage reduction of a logarithmic volume control is measured in decibels.
soldar:
Another cite:
--- Quote ---https://en.wikipedia.org/wiki/Gain_(electronics)
The term gain alone is ambiguous, and can refer to the ratio of output to input voltage (voltage gain), current (current gain) or electric power (power gain).[4] In the field of audio and general purpose amplifiers, especially operational amplifiers, the term usually refers to voltage gain,[2] but in radio frequency amplifiers it usually refers to power gain.
--- End quote ---
Another: http://www.sengpielaudio.com/calculatorVoltagePower.htm
mikerj:
--- Quote from: bob91343 on August 09, 2019, 04:38:26 pm ---I reiterate that decibels are a measure of power ratio. Any other use is perversion.
--- End quote ---
You can reiterate it as many times as you want, but unless you back it up with some actual evidence then I'm just going to ignore it.
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