• 0 Posts
  • 28 Comments
Joined 1 year ago
cake
Cake day: June 23rd, 2023

help-circle




  • Well written.

    I think an important concept to introduce is Pulse Width Modulation, or PWM for short.

    Normal AC Power coming out of wall looks like a sine wave, in that it smoothly cycles between +110/240V and -110/240V. This means that 50% of the time the voltage is positive and 50% of the time the voltage is negative.

    PWM usually deals with signals which are either entirely on or off, with no transiton between them. This way, you can vary the amount of “power” delivered by varying how much of the time the signal is on and how much of the time it’s off.

    Dimmers usually modify the sine way in a way that tries to accomplish the same thing, by chopping up the signal to make the effective “on” time be shorter than 50%.

    With non-dimmable LEDs, this messes with the AC to DC circuitry in the lamp in the way slazer2au says, because the lamp doesn’t retain enough power between two on-cycles to stay on.














  • I like it a lot.

    I have pretty narrow ear canals, so I can’t really wear airpods without fear of them flying out while biking. The ear hook design solves that. I misplaced a pair of KZ AZ09s on holiday this summer, but I’ve since replaced them with a set of Fiio UTWS3.

    I have nothing but good things to say. The weight of the Bluetooth hooks negligible, especially because the majority of the weight is resting on your ears. I hardly feel them when I’m use (besides the feeling of the actual IEMs in my ears), and having a button on each ear is really convenient.

    The case is on the big side, but it fits well enough in my pockets to not be that big of a deal. The battery in the units are big enough to last for ages, and the battery in the case being an actual big battery means I charge them once a month, at most.