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Added alt text to every image, bumped up archive page pagination

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Bastian de Byl
2020-07-12 23:42:13 -04:00
parent a4f698ee8e
commit f83f4515c5
7 changed files with 58 additions and 26 deletions
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content/post/headphone-fix.md
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@@ -8,7 +8,8 @@ tags: ["electronics"]
A colleague offered a pair of Bern Bluetooth drop-in headphones to me fore free,
with the catch being: _I had to fix them_
{{< thumb src="/static/img/headphone-fix/IMG_7505.jpg" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7505.jpg"
alt="Photo of Bern brand headphones under magnifying glass" >}}
<!--more-->
# Don't Turn It On, Take It Apart!
@@ -28,8 +29,10 @@ right speaker put out no sound._ I checked the known-good left speaker using my
wanted to find out what to expect when troubleshooting the right channel.
{{< thumbgallery >}}
{{< thumb src="/static/img/headphone-fix/IMG_7506.jpg" sub="Left Speaker" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7511.jpg" sub="Right Speaker" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7506.jpg" sub="Left Speaker"
alt="Photo of oscilloscope showing working left-speaker analog signal" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7511.jpg" sub="Right Speaker"
alt="Photo of oscilloscope showing broken right-speaker analog signal" >}}
{{< /thumbgallery >}}
Knowing what to expect on the oscilloscope, I hooked up the probe to the right,
@@ -42,7 +45,8 @@ disconnected at this point in time to ease the troubleshooting process.
Lucky for me the PCB pads were labeled -- even better `SPKL+` (_left_) and
`SPKR+` (_right_) were easy to find.
{{< thumb src="/static/img/headphone-fix/IMG_7507.jpg" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7507.jpg"
alt="Photo of close-up magnified view of broken right speaker PCB" >}}
Outside of the bluetooth board hidden under the piece of tape, there's not a
whole lot going on in the circuit. It was my guess that the visible surface
@@ -57,7 +61,8 @@ which verified that to be the case.
115_) to test continuity of the circuit from the known-good and the now
known-bad speaker traces back to the `OUTL` and `OUTR` outputs of the amplifier.
{{< thumb src="/static/img/headphone-fix/IMG_7514.jpg" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7514.jpg"
alt="Photo of right speaker PCB hanging out of casing" >}}
Removing the board from the housing required a bit of finesse. I didn't want to
bother desoldering the left speaker connections to make removal easier. So, with
@@ -81,7 +86,8 @@ Using the 3.5mm mini-jack's solder pads, I found continuity to be true from the
chips left and right outputs to the conveniently accessible solder pads. _A
bodge wire was in order_..
{{< thumb src="/static/img/headphone-fix/IMG_7515.jpg" sub="Note the bodge wire" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7515.jpg" sub="Note the bodge wire"
alt="Photo of close-up magnified view with soldered fix wire in right speaker PCB" >}}
# All's Well That Ends Well
@@ -90,7 +96,8 @@ pin to `SPKR+`. Lo and behold it was now closed-circuit! I was very happy to see
the expected waveform from the known-good left channel now also appearing on the
right channel.
{{< thumb src="/static/img/headphone-fix/IMG_7516.jpg" >}}
{{< thumb src="/static/img/headphone-fix/IMG_7516.jpg"
alt="Photo of oscilloscope showing fixed right-speaker analog signal">}}
At this point I quickly re-soldered the wires to the speaker and enjoyed music
now coming into both ears!