Color Classification:
A: Pre-stage (LME49720NAX2 plan)
B: Pre-stage (MUS8820X2 plan)
C: Pre-stage (5532DDX2 program)
D: Bluetooth 5.0 (LME49720NAX2)
E: Bluetooth 5.0 (MUS8820X2)
F: Bluetooth 5.0 (5532DDX2 scheme)
In December 2018, a new Bluetooth 5.0 function was added. In addition to analog input, it can also receive Bluetooth data from mobile phones. It is easy to use. The solution is Qualcomm&x27;s QCC3003, but Bluetooth 5.0 is not enough to burn. It also adds an independent decoding chip to the Bluetooth digital signal, TI&x27;s high-end PCM5102A, which has a very large improvement in details, dynamics, and level, and lossless transmission.
The schematic diagram of the kit, you can download this file package, there are schematic diagrams of all the kits in this shop
http://pan.baidu.com/s/1gfgF22B
1 Bluetooth receiver is based on the real 5.0 module, with low latency and lossless signal (Qualcomm QCC3003 solution)
2 Bluetooth decoding core The decoding part adopts the latest American BB company&x27;s new PCM5102A decoding core, which is a 24bit stereo audio digital-to-analog conversion chip (DAC), with a dynamic range of 112dB, distortion -93db, and a direct output of 2.1V RMS audio voltage. There is no glitch in the frequency, the low frequency is strong, and the dive is good.
3 Bluetooth is easy to use, just turn on the Bluetooth pairing of the mobile phone to connect to the Bluetooth
200 wide 45 high 191 deep Knob spacing 25+25+34
The signal-to-noise ratio of this tone board is very high, without any hum, but if you are running naked, the potentiometer must be grounded, otherwise it will be interfered by the outside world. It is best to install the chassis to ground, so it is absolutely silent.
Do a good job of grounding, and use shielded wire for input, so that the front stage is absolutely as quiet as the deep sea
E5532 tone boards are everywhere, most of them use the same circuit, and some blindly fight for the price, but do not want to work hard on the effect, ignoring the pursuit of high sound quality for enthusiasts. So I decided to come up with a product with moderate price and better sound quality to benefit enthusiasts. We use professional design, excellent circuits, and many years of DIY experience to make products that enthusiasts want, take a different design style, insist on innovation, and sound us well. Have been working hard, good results are waiting for you to witness.
. Class A power sampling HIFI famous tube BC139 BD140 plus TL431, the capacitor adopts German WIMA ERO Siemens and other capacitors, high-speed rectifier tube, pure copper pin resistance, etc.
Operating voltage: AC12-0-12 to AC18-0-18
Tone board size: 145X66MM
Board size with bluetooth tone: 145X84MM
The following is the rendering of the whole machine
PCB mounting holes and 30W R cattle mounting holes have been opened
Main tone circuit
Class A parallel power supply circuit