This amplifier comes as a kit, but no soldering is required. The base plate is made of laser-cut Plexiglas. coppered on both sides. Soldermask has been cleverly used on the top plate to make brilliant marks on the underlying solder coated copper to clearly mark all connections. This amp has 5 Mangxin capacitors to filter the input voltage. Each is rated at 470uF at 35V. This leaves 8V headroom at maximum input supply voltage. Good quality output inductors and capacitors. They were very easy to assemble, it only took five minutes to screw on the top and bottom. I hooked this amp up to a set of TV speakers and a 12v lead acid battery from an old scooter. Since I'm running it on battery, there shouldn't be any noise from the power supply affecting the sound quality. let me know it works. This amp beeps every time it is connected or disconnected. For example, when you turn off Bluetooth on your phone. Before it was paired with anything, a slight hiss came out of the speakers. As soon as I connected the adapter (BT-WUZHI) to my phone, the speakers went completely silent. The amp with my phone was very simple and required no codes. When audio is played with no delay between audio segments, there is no audio jitter. It works well for text to speech apps so you can listen to your books. just starting, there is a 100ms delay before the sound comes out of the speakers. This means you may not hear the first syllable of a text message. However, after playing the audio, there is no hesitation. The noise level can become very loud if you turn up the volume. The volume control is a bit noisy as there is a slight hissing or wiper noise when adjusting the volume. I measured 70mA when the volume was high enough to fill my living room. m measured 74 mA in standby mode and without pairing. Power consumption is slightly higher when audio input is used instead of Bluetooth as Bluetooth is not paired and the lowest current is 74mA when not paired. The audio line works well and is perfect for a Raspberry Pi or connecting to an MP3 player. Overall this is a really good amp with good sound quality. This amp will be very useful for all kinds of applications.
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