Archive for the ‘Random’ Category
This isn’t going to become a thing on this channel – I was just hungry and wanted to record it… I think I should stick to computer stuff. If I hadn’t put any effort into editing this, I would’ve put this on my other channel.
The second and much-shorter part, as I clear out some random rubbish in my room. There are a few more old electronic devices, including a ~25-year-old LCD game, plus some paper stuff…
This time, I didn’t throw away or dismantle everything in the video! I did thoroughly rearrange whatever remained afterwards, though.
I was cleaning out my room and found a load of random stuff (mostly toys), and some of it was interesting, so I decided to record it. Some of it’s around 14 years old. I didn’t intend for 50% of the video to be about Beyblades.
Never mind just gapless playback – let’s throw 99 tracks at various CD players (hardware and software) within 40 seconds and see how they handle it!
The music I used is “Nature’s Gasp” by Atmozfears & Devin Wild. Big thanks to Atmozfears for letting me use it on YouTube (now let’s hope that YouTube’s automatic song recognition doesn’t punish me despite that…).
This test just naturally emerged after I played around with splitting tracks in a hardstyle mix for seamlessly playing on a CD. The trick to ensuring no silence between tracks was to split on CDDA frame boundaries (every 2352 bytes, which makes 75 per second for audio CDs). It took me some time before I realised that Audacity can measure position in CDDA frames and that I didn’t have to convert the number of samples into CDDA frames myself every time…
I don’t have a grudge against Foobar or anything – it really did get stuck in a loop of spinning up and down the CD the last time I tried it. Also, this may be my most anticlimactic and rushed ending ever.
Here, I conneced a solar panel (via a transformer) to a sound interface as if it’s a microphone, to reveal the subtle pulsing and filckering of various light sources. If you don’t like 50 Hz, this video isn’t for you.
Thankfully, the infrared light from my camcorder is apparently very clean (not pulsing), so I can use that to see things in the dark without affecting the sound.
The transformer is just designed to convert 230V AC to 12V DC, so its audio properties are not very good (it muffles things a lot). Ideally, I’d be using an audio transformer that’s designed to sound good, but this is all I had available. I am using it to remove the DC current that the solar panel makes, because I don’t fancy putting 17.5V into my Quad-Capture (sound interface)’s mic input. I originally tried to make a high-pass filter to remove the DC, using a capacitor and resistor, but it only worked until the capacitor became fully-charged, at which point the sound faded. It was much clearer-sounding than the transformer, but there was also a huge amount of background noise.
I want to revisit this idea in the future, especially to take it for a drive at night, listening to the street lights and car lights (since modern cars use PWM to dim the tail lights).
The circuit board inside this clock died, so I replaced it with my laptop. You could say that the clock speed is about 70x the standard speed (this is the fastest the mechanism can handle before it just oscillates) – I’m impressed it can handle this.
The headphone output is connected directly to the coil in the clock movement and driven with a square wave. The coil is 250 ohms – some headphones are much lower than this, so there’s no need to worry about damaging the laptop’s headphone output, either! The gears, on the other hand, may wear out a little quicker than usual. =P
I had to open this printer to fix it for someone recently, and was impressed with its speed, so I recorded this quick and dirty video. I guess I should re-record it (making it print multiple pages), but I’m lazy. Maybe some day.
The printer is an HP scanner/printer combination (Photosmart C4780). I’m impressed by the fact that it can still run with its scanner board disconnected.