SoulBay Universal Power Supply AC to DC 3V 4.5V 5V 6V 7.5V 9V 12V Multi Voltage Power Adapter with 8 Plugs for Center Negative(-) Tip Negative Effects Pedals Keyboards Instrument - 2A Max

I found this neat ball clock at goodwill for a good price and had to pick it up. It did not come with a power adapter and it happened to be center negative. I work with electronics a lot and have never come across a center negative device before. This adapter was only a few dollars more than a different one on amazon, but is way more valuable because of the variable voltage. Since center negative is so rare, if I ever find another device that needs it I can just adjust the voltage and borrow the clock's power supply.

I have an old tape player and a ton of Prairie Home Companion radio shows I taped and haven’t listened to in years. I couldn’t find the cord for the tape player and I wanted to save on its batteries. This was the perfect solution! Works like a charm!

I was looking for a power adapter for a Casio CDP100 which requires a 12V 2A non standard negative center pin. This power adapter has the ability to switch voltages which was great and it also comes with a number of connector to fit different hole sizes. Unfortunately the CDP100 power connector hole is very non standard and requires a short connector. This power supply did power the keyboard but slight movements would lose connection. Still rating this adapter high but a different connector is needed for the CDP100.

perfect...

Needed a negative polarity (which I believe a lot/possibly most guitar effects pedals use) along with 12V and 2Amps power. That 12V/2A/Neg Polarity combo was extremely hard to find but is required to power an older T-Rex Octavius Octave Generating Pedal. This pedal really saved the day for that one. Switched it to 12V and attached the largest physical plug-in adapter they included properly; it fit tight and fired right up all around. I suspect it would also work with 9V guitar pedals (of which there are many) if you switch it over to the 9V designation but have not tested that.

I bought this adapter because it specifically mentioned my piano, but it doesn't even fit correctly.The boot of the cable started falling apart a month after useThis adapter has been plugged in, used and but never touched... still fell apart.

We have an electronic dartboard bought more than 15 years ago, and we lost the plug-in for it. Some forums online said that it was center-negative and about 9.5v. I couldn't find the original manufacturer plug online and decided this was worth a try. It works perfectly! If the dartboard dies, the plug has so many options that I'm sure I can find another device I could use it on in the future.

Was able to use it on a small Casio, the sound came through the speakers with no issues. Very convenient.