Intriguing that the HP touchpad charger won - it is the charger we won't stand to have during the Bed room. When not less than load, ours gives off a high-pitched (like 10khz) whine that drives us insane.
Internet websites for instance AppleDefects.com were being developed in response to The difficulty and specific top quality Handle concerns with Apple's merchandise portfolio.
There are numerous comments about tests manufacturer Bb and aaaa. I think the sole way the author can examination will be to send him two units!
Thanks for the time you've got place in scripting this article. Pretty effectively produced, through and insightful.
Anonymous with the step-down transformer: My guess is the fact that using the stage-down transformer supplies a little bit of filtering If your input energy is poor (due to its inductance), but it really wastes some energy in the procedure.
I am puzzled by the steep voltage sag on both equally the iPhone and iPad charger. For the reason that designers of your Apple charger went to an excessive amount of exertion to make a high quality charger, I conclude they must not look at voltage sag worthy of stressing about.
Though the two the LEDs along with the regulated NodeMCU are possibly isolated from problems with higher-frequency oscillations, it is actually a concern if you will find any issues through the charger basically not providing 1A or from its build high-quality.
Also investigating the oscilloscope traces I suspect that not just was this examined just for 230V but additionally only at 50Hz.
I've taken apart several counterfeit chargers and visitors have despatched me shots of Many others. Astonishingly, the counterfeit chargers I have examined all use distinct circuitry internally. If you have a counterfeit, it may be even worse or much better than what I've seen.
This counterfeit charger has a great deal noise from the output which i had to double the dimensions over the still left to acquire it to fit. Be aware the incredibly massive spikes while in the output (yellow).
The above photograph reveals his response the internals of a counterfeit Apple apple iphone dice charger. The 2 boards stack to kind the compact cube shape. This charger blatantly attempts to pass as a real Apple charger; as opposed to the "Designed by California" charger, this one particular accurately copies the "Designed by Apple in California" textual content from the real charger. Note the very simple circuitry - there are no components on the opposite aspect on the board, no controller IC, and hardly any filtering.
The graphs in this area require a little bit of explanation, that's furnished during the diagram under. The voltage/existing load curve displays the overall performance from the charger less than various masses.
The plots also display the frequency spectrum in orange, from 0 at the left to 230 kHz at the appropriate. The specified graph would've the orange spectrum in close proximity to the bottom of the monitor.
In this area I think about the voltage and recent output via the charger because the load raises. The very first rating is Voltage Sag, that's the undesired drop in output voltage as being the load boosts.