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Martin Kennedy 2025-03-30 13:42:07 -04:00
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Midterm.md
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@ -13,8 +13,8 @@ experience) that most devices which accept a set of headphones through
a 3.5mm "TRS" audio jack will output roughly the same maximum volume
through that set of headphones.
| ![](./images/Typical_TRS_Jack.jpg) |
|:--:|
| ![](./images/Typical_TRS_Jack.jpg) |
|:--:|
| *A typical, well-loved 3.5mm TRS jack besides a laptop line-out port.* |
Don't believe me? Grab a 3.5mm cable meant to connect an output, like
@ -22,23 +22,23 @@ a phone, to a speaker, and use a multimeter to measure the unloaded
RMS AC output voltage of a 60Hz tone. Be sure to use the same software
on multiple devices to get a normalized comparison of different
hardware.
| ![](./images/audacity_60_hz_tone.png) |
|:--:|
| ![](./images/audacity_60_hz_tone.png) |
|:--:|
| *We generated [this 60Hz tone](./files/60hz.aac) using Audacity, under Generate > Tone > Sine, 60 Hz, Amplitude 1 (100%)* |
- Experiment pitfalls:
- Q: Uhh ... which conductors am I measuring?
<details> If you're unsure which conductors to measure between:
the sleeve is usually a common reference ground, but in doubt,
use your multimeter in continuity mode and see if you can find
contuinty to the computer case or, for example, the outer shield
of a USB connector. </details>
- Q: Why 60Hz?
<details>Not all multimeters are equal, but some things don't
change: any portable multimeter equipped to probe the 60Hz,
120VAC signal provided by your household electrical socket is
@ -51,7 +51,7 @@ hardware.
- We tried this experiment on a Thinkpad and a Dell desktop, using
the `mpv` media player on two Fedora Workstation systems:
| ![](./images/laptop_mpv_100.jpg) | ![](./images/laptop_mpv_130.jpg) | ![](./images/desktop_mpv_100.jpg) | ![](./images/desktop_mpv_130.jpg) |
| ![](./images/laptop_mpv_100.jpg) | ![](./images/laptop_mpv_130.jpg) | ![](./images/desktop_mpv_100.jpg) | ![](./images/desktop_mpv_130.jpg) |
|:--:|:--:|:--:|:--:|
| *Laptop, 100%* | *Laptop, 130%* | *Desktop, 100%* | *Desktop, 130%* |