Review on 🔊 Ximimark NE5532 PCB Sound Magnifier Board: Enhance Your Audio with Preamplifier Amplifier Module 4558 LM833 LT1057 AD827 OPA2604 by Chelsea Hayes

Perfect. Exactly what I needed and didn't have to build it myself. I bought two. Only one was needed but a second was needed and I ordered two more. Beautifully finished with all Suface mounts but this makes them difficult for the user to modify. No documentation or schematics were included. But I got confused when I found a diode on the board. It turned out that this was placed at the input of the power supply to protect against incorrect power connections. I couldn't get all the details and do it at this price. Gain 5 (approx. 15 dB). This is an ANALOG audio amplifier not intended for use with digital applications. The input power can withstand the range of 12 to 30 volts. COLOMBIA REGION. I use 12 volts.