NS LM3886 is the United States launched the mono audio power amplifier chip, using an 11-foot TO-220 package, the back of the "TF" suffix is ​​fully insulated package meant. And LM1875T compared to its more powerful, at the rated working voltage up to 68W continuous average power without distortion, also has a relatively perfect over-voltage over-current overheating protection function, in addition it has a current anti switch automatically when shock function, the speaker may be possible to avoid current surge when the amplifier power is turned on causing injury.



LM3886 performance parameters at a glance:

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

· VCC = ± 35V OUTPUT = 50W / 8Ω

* Peak power: 135W

· SNR ≥92db

* Conversion rate: 19V / us

· Intermodulation distortion: 0.04%

· 11 feet TO-220 package

· Mute function

· SPiKeTM protection

The amplifier board has the following characteristics:

1, using double-sided alignment, careful layout, signal input portion away from the output section. Ground part of that ground.

2, part of the coupling capacitors for longer minimum pad 5mm, the maximum suitable for the capacitor of 10mm.

3, the input section added high pass circuit, making the board more stable!

4, the output part RL circuit (inductance and resistance in parallel) effective protection chip, effectively preventing the induced electromotive force shutdown speaker damage to the chip!

Materials used:

1, Sheet glass fiber 1.6, size: 106 * 54mm, chip pitch of 51mm. Widening output section traces, and left large electrical flow tin!

2, Germany WIMA coupling enthusiast capacitor decoupling Nikon, Panasonic Silver word negative feedback enthusiast audio capacitors, mute is the day of, Beiru Er capacitance Thomson, the resistance rings are gold film copper foot. LM3886 (original disassemble) is insulated version without the installation of the insulation sheet! Tu-point proposal grease on the line.

Installation note:

1, the amplifier board can not be directly connected to a transformer output connected to the power supply board first, and then to the power supply part of the board from the power board output, pay attention to positive and negative level not be wrong!

2, the plate DC power supply, speaker output impedance smaller current increases, the greater the heat, it is recommended when the speaker is 4Ω, the voltage suggested the use of ± 28V (transformer dual 21V), the speaker of 8Ω voltage ± 32V (transformer dual 24V), the highest possible ± 35V (transformer dual 28V), but pay attention to the local grid voltage is stable, it is recommended not to use.

3, when the power test, the signal input on the board to take the load, can not be suspended, otherwise there will be induction noise, the signal line to make use of shielded cable.

4, the input end of the ground if the board into the chassis, be sure to board on the chassis of the housing and connected, if added to the front stage, the input stage is not necessary to draw a box, as long as the preceding stage input connected to chassis ground then, then, then both will cause ground loops, noise.

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