Description Signal to Noise Ratio: 103 Dimensions (WxHxD): 101*98*33mm Body Material: Aluminum WIFI: No Bluetooth: Yes PCM: No DSD (Direct Streaming Digital): No Op Amp Chip Model: =DAC Model: = Channels: 2 (2.0) Package: Yes Output Power: 120mW Model: DAC-A1 Type: Mini Amplifier Recommended Headphones Maximum Impedance: 151-200 Ohms Built-in Battery: None Output Type: LINE OUT (Audio Output) Input Type: USB, COAXIAL, OPTICAL, Bluetooth Name: Aima:: CE Product Description: Product Name: DAC-A1 Chipset: SA9123L+ES9018Q2M+NJW1194+MAX97220+NE5532QCC3034 Bluetooth: Version 5.0, supports AAC, SBC, APTX, APTX- LL and APTX-HDPC-USB sampling rate: 24bit/192khz PC-USB operating system: Windows XP/window7/8/10 / Max OS/MAC/Linux Optical/coaxial sampling rate: 24bit192khzRCA: Snr: 103 db, THD + N : 0.0032% Headphones (unbalanced): Snr: 100db, THD+N: 0.0032%, Frequency response: 20-20Khz (1db) RCA output level: 2.3V High and bass adjustment range: 10db Headphone amplifier output power: 120mW@32 Headphone impedance: 16-200 Audio input: Bluetooth/USB/Coaxial/Optical fiber Supported devices: mobile phones, tablets, computers, MP3, TV, etc. Output mode: headphone amp/amplifier + passive speaker/active speaker Power supply: DC5V size :101*98*33mm Package includes: 1 piece DAC-A1 Product Problem: 1 Amplifier board has current sound and noise Most of our amplifier boards use DC power supply. The board itself will not produce current sound or noise. The main causes of current noise are: A. The power filter used is not good; current sound is caused by power or audio input errors. B. The input signal quality is poor; the output of the input connected device is improper, and the audio source input is abnormal and produces noise. C. The quality of the input line is poor: the line contact is poor; the wiring is damaged and the wiring is suspended. There are other playback devices connected to the input, and some devices share the power supply, causing noise. 2. No sound output Channel A has no sound. The speaker is broken. B. The input line has poor contact; the wiring is damaged; the device output and input connections are improperly connected. 3. The volume is off, and there is cracking when the sound is loud? A. The input power is insufficient. First, make sure the wiring is correct and the power supply current is sufficient. B. The speaker itself has poor performance or is damaged, and the speaker power is too small or too large. C. The left and right channel speakers (+) (-) output independently and cannot be connected to each other. Does the speaker have cracked sound when the subwoofer amplifier volume is turned up? A. There are not enough nuts now. First confirm whether wirinn is correct. B. Whether the power of the speaker itself is too large or too small or whether the bass performance of the speaker itself is poor: These abnormalities in the structure of the speaker cabinet will cause damage. 5. The volume and power are not enough? power and supply voltage. The amplitude of the sound source signal and the impedance of the speaker are all related, and any defect will affect the power 6. Will the amp get burned? A. The positive and negative poles of the power supply are connected reversely; the power supply voltage is too high and exceeds the board's limit operating voltage B. If the board requires DC power, it is not allowed to directly connect the AC transformer power supply (it can be used only after rectification and conversion to DC power) C. After confirming that the wiring is correct, connect the power supply. Wrong wiring or short circuit will cause damage to key components.