[Photos] 50W amplifier with LM3886

LM3886 is a new high-fidelity high-power music IC with protection from overvoltage and overtemperature, which is simple and easy to manufacture. Its performance is as follows:

VCC = ± 28V OUTPUT = 68W / 4Ω, 38W / 8Ω

· VCC = ± 35V OUTPUT = 50W / 8Ω

· Peak power: 135W

· Signal to noise ratio ≥92db

· Conversion rate: 19V / us

· Intermodulation distortion: 0.04%

· 11-pin TO-220 package

· Mute function

· SPiKeTM protection function

There are two models of LM3886: LM3886TF and LM3886T, the former heat sink is insulated, the latter is not insulated.

The following figure is the application circuit diagram provided by National Semiconductor Corporation:



how about it? Simple. The following is a list of components:

R1: 1KΩ 1 / 4W gold film

RM: 33KΩ 1 / 4W gold film

Ri: 1KΩ 1 / 4W gold film

Rf1: 20KΩ 1 / 4W gold film

R6: 10Ω / 3W

L: 0.7uH Use Φ1 enameled wire to make 4 rounds on the signature pen, just remove it

Ci: 10uF / 35V tantalum capacitor

All other capacitors are 100uF / 50V electrolytic capacitors

Potentiometer is 10KΩ finger

The following is the PCB diagram I typeset, single panel, it is easy to process by yourself. The potentiometer is canceled because it is only the pure final stage; the mute is normally open and the switch is also canceled; a 3Ω / 2W resistor and a 0.1PF speaker compensation circuit are added to the output. The left picture below is the PCB wiring diagram, and the right picture is the component arrangement diagram. Immediately grab it and take photos, and then tell me how the effect is? Don't tell me it doesn't ring :)




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