Lower voltage output than typical AC adapters, Unstable voltage output at 3 & 4.5 volts
I wonder how many people that have used this have actually TESTED it with a meter? I've been using and testing AC adapters for decades, this is only the SECOND one* out of many hundreds who's voltage output is what is indicated on the adapter. Yep, that's usually NOT the case, voltages are always a considerable % over what is marked; "12v" adapters (or the "12v" settings on universal adapters) are usually about ~15v, "9v" is usually about ~12v, and so on. This adapter's settings are spot-on. This is neither a good nor bad thing, it's just something to note: If you need to power something that lights up, or performs some kind of "mechanical work", and it's a "12v" device on which you've always used a "12v" adapter (which again, usually was putting out about 15v), the device with this adapter may not be as bright, as fast, (whatever the case may be) as it was with a previous "12v" adapter because now it would be getting about ~3 volts less. In some cases this would be GOOD if the device is voltage-sensitive and should not be over-volted. *(The only other adapter was a 3v digital camera adapter that read exactly 3v).
One thing that did trouble me was the voltage output at 4.5v and 3v was really unstable, jumping around a lot by about .2v both + and -, both ways. That's a variance of about .4v, might be of concern for some 3-4.5v voltage-sensitive devices. Luckily I will only be using it for 9 or 12v devices, and hopefully there won't be any issue with the devices getting lower voltage than they previously did.
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