Bluetooth 5.0 transceiver from…

Greetings! The manufacturer endowed it with many ways, both for wired and wireless connections to multimedia – here both optics for TV and an analogue for small portable ones and via USB Type-C are defined as DAC: autonomy is high – up to 20 hours in receive mode , which is very good, enough for the whole day, and since Bluetooth is reinforced with antennas, there should be no restrictions on transmission stability, even in the fresh air BYPASS-mode — USB connection A 100 Hz meander at 30 Hz is a little dull – the shelf collapses more strongly, which confirms the presence of a high-frequency filter in the amplifier, competently, from "permanent" I was interested in CM433, "Transmitter-Receiver" with two Bluetooth antennas for aptX-HD – almost everything can be "wireless", plus it works as a USB DAC … As usual, they are met by the packaging, it is a very compact new seal – cut open Having moved to a stationary location, I first of all began to consider connecting the device as an external DAC, and in this BYPASS mode it is defined as a CSR 8675, it is also seen as a microphone , but unfortunately it does not have this function, even with a headset in a 3.5mm jack. There is already a portable USB-DAC CM402 in use on CS43131, but I wanted to try something else from the company’s range, CM433 caught my eye – what if they just didn’t mention a hardware DAC, such as ESS or AK … naive? — yes, but there was hope. I took the measurement first without load, and then with it – it really turned out to be more than 90dB SNR, as promised, but it’s not > 100, as it could be with a DAC chip, overall it’s good, but it’s clear that the built-in amplifier doesn’t really like current load, slightly raises the edges of the range, but knows his business and does it Walking through the test tracks, I wasn’t surprised by their shape – it’s quite normal for this chip, the only pity is that it doesn’t support LDAC For At the beginning, I was interested in working on an analog output – what level of an analog signal can be obtained with such a connection? In aptX-HD mode with a load, 1.2VA came out without load, from peak to peak the level rose to 1.92V, which clearly indicates not only the presence of an amplifier, but also its not very low output impedance. – slightly fills up, but not critical … most likely, capacitors were installed before the amplifier, the blockage of the shelf indirectly indicates this (they are not in the CM402 from Ugreen, a device of this kind with a DAC) and the drawdown of half a volt with a load is not entirely clear, today it rather, the lot of codecs, you need to figure it out … however, completely different tasks will be set before this device – active, multimedia acoustics or a corner of a home media center, headphones less often. RX-mode – receiver There are soft legs on the bottom of the device, laser engraving indicates the model and some characteristics. The only caveat is that a separate DAC for the output is not declared 3.5mm, but is it necessary here? in multimedia… On the left is the switch for digital (SPDIF) and analog (AUX) inputs / outputs on the opposite side – the power button and the mode switch – RS / BYPASS / TX, which is responsible respectively for receiving signal (RX), wired connection via USB (BYPASS) or for transmission (TX) interfaces that will be used in one mode or another – circled in separate groups – convenient and understandable in my opinion Antennas, unfortunately not removable (and you can’t raise them everyone will need it within the room), but with them the device looks solid! there are only three keys on the panel, two are responsible for the volume or rewinding the track, and the third, as usual, for playback

Bluetooth 5.0 transceiver from Ugreen CM433 with AptX HD/LL based on CSR8675

Measured in RMAA using a smartphone (there is aptX-HD), it served as a transmitter … Connects to a smartphone with aptX HD in priority, codenamed Ugreen-20140 and corresponding quality 24/44.1, with a bit rate up to 576 Connected to a PC over the air – identified as UGREEN 20140 headphones, already correct, without a non-existent headset microphone There is a partition inside, separating the cable compartment from everything else“Everything else” is the device itself, a couple of instructions and a cable for connecting to a PC via USB and there is no charging, additional analog or digital optical cables USB, by the way, “interface” – it transmits data, which I was sincerely glad, after the lack of data transfer from the portable CM402, the instruction on one large sheet is not very convenient, but it is, although not according to our

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