LM3886 GC Amplifier Board 68W+68W HiFi Dual Channel Audio Amplifiers Without LM3886 Chip

Product Specifications

Name: LM3886GC Fever amplifier
Supply voltage range: AC20Vx2~AC26Vx2 (transformer above 150W)
Output power: 68Wx2 (transformer determines the final power)
Output impedance: 4~8Ω
Frequency Response: 20Hz~20kHz
Input sensitivity: 800mv (+50mV)
Signal-to-noise ratio: ≥120dB (A-weighted)
Distortion rate: ≤0.03% (20Hz

Design ideas

Simplify the complexity, follow the fever concept of "simplicity first", give the audio signal the most direct path, and truly restore the original sound of the famous device LM3886, abandon the controversial DC servo circuit, and adopt the famous GC circuit structure. The point voltage and distortion rate have been reduced to a very low level, which is almost an order of magnitude lower than the official line. The direct reflection in the sense of hearing is that the sound is transparent and natural, sweet and durable. The arc routing of the circuit board strictly follows the one-point star grounding. The signal-to-noise ratio is as high as 120dB. The high-current loop adopts the upper and lower layers of copper cladding and is supplemented by the immersion gold process. Strong and flexible. The entire assembly has a compact and reasonable structure and is suitable for most common male mold cases. Install a shield plate and ground it with a copper column, which is especially suitable for enthusiasts who use a wooden chassis or bare metal.

Matching instructions:

(1) The output power capacity of this power amplifier board is 68Wx2, the final actual output power is determined by the matching transformer, using a transformer of more than 150W, the input voltage range is AC20Vx2~AC26Vx2;
(2) The magnification of the power amplifier is 30 times (increasing the basin by 30dB), and the original sound effect can be obtained without the pre-amp. Of course, the pre-amp can also be added according to the actual situation.
(3) Match with 4~8 ohm speakers below 8 inches.