Review on 🔌 JOVNO 9V 1A Power Supply (2-Pack), Universal AC to DC Adapter 100-240V with 5.5x2.5mm Tip for Arduino, NES, RCBS Chargemaster, Breast Pump, Elliptical Machine, Elegoo Kits, Security System, Router by Frank Dubey

the price was great. I ran some simple tests and the adapter supplied a relatively stable voltage (9.4V) to the amp. I love the little terminal block they include. It will be useful for my work with simple electronic projects. I think a lot of people won't need it. It has an LED that shows it's on. This is useful. There is some noise at the output. This is a fairly low level and is mostly around 40kHz. Probably with a switching power supply. A 1uF capacitor on the load reduced the noise spike by about 10-15dB in my setup, so this approach can be useful if needed. I bought two at first and will probably buy two or three more for different projects.