LM3886 amplifier board #Minimus Gainclone 70W

| | , ,

LM3886 amplifier board #Minimus lm3886 gainclone 70W, Gainclone is a circuit compact audio power amplifier using integrated circuit National Semiconductors LM6886TF, PCB compact, making it ideal for use where you need a compact amplifier with high power and high-quality audio.
Ideal for use in various applications such as, computer games, MP3 Player, Home Theater, Surround sound, etc.

About the amplifier circuit with LM3886 – Minimus Power

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz.

The performance of the LM3886, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKe) protection circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage, undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks.

The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0µV. It exhibits extremely low THD+N values of 0.03% at the rated output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.

Get new posts by email:
Follow us on social media
  • 68W Cont. Avg. Output Power into 4Ω at VCC = ±28V
  • 38W Cont. Avg. Output Power into 8Ω at VCC = ±28V
  • 50W Cont. Avg. Output Power into 8Ω at VCC = ±35V
  • 135W Instantaneous Peak Output Power Capability
  • Signal-to-Noise Ratio ≥ 92dB
  • An Input Mute Function
  • Output Protection from a Short to Ground or to the Supplies via Internal Current Limiting Circuitry
  • Output Over-Voltage Protection against Transients from Inductive Loads
  • Supply Under-Voltage Protection, not Allowing Internal Biasing to Occur when |VEE| + |VCC| ≤ 12V, thus Eliminating Turn-On and Turn-Off Transients
  • 11-Lead TO-220 Package
  • Wide Supply Range 20V – 94V

Buy kits LM3886 in Aliexpress with free Shipping in the Worldwide.

LM3886 is a single-channel, high-performance audio power amplifier IC produced by National Semiconductor (NS) company  , the maximum continuous output power up to 60W, from the launched time to now, was loved by the majority of audiophiles.

The single-channel power amplifier design, a board per channel amplifier parts, amplifier board can be used in parallel.
Recommend DC dual 20-28V power supply.

  • 68W output power into 4Ω at VCC=±28V
  • 38W output power into 8Ω at VCC=±28V
  • 50W output power into 8Ω at VCC=±35V

See other interesting projects:

There is an Excel spreadsheet to assist in calculations for amplifiers with the integrated circuits LM1876, LM4765, LM4766, LM4700, LM4701, LM2876, LM3875, LM3876 and LM3886:
Overture Design Guide xls
Using the Overture Design Guide

C1 of 1µF serves to block any DC voltage at the amplifier input and coupling the audio signal, also together with R3 22K, forms a high-pass RC filter, the formula is Fc=1/2ΠRC. In our circuit it will give 7.2 Hz.
R1 and C3 form a low-pass filter, to avoid RF signals at the amplifier input. The formula is Fc=1/2ΠRC, in our circuit this value was 723kHz, if you prefer you can change this.

R5 is the feedback resistor and defines the gain of the amplifier, the formula is Av=1+Rf1/Ri where Rf1 = R5 and Ri = R2, in our case we have a gain of 23V/V or 27dB.

R6 and C5 form a low-pass filter in the feedback circuit.

R7 and C10 form the Zobel network, preventing high-frequency oscillation caused by inductive loads.

The mute circuit has resistor R4, it should be calculated using the following formula ⇒ RM ≤ (|VEE| – 2.6V)/I8 where I8 is ≥ 0.5 mA. VEE is our negative voltage used.

To use the Excel spreadsheet:
Rf = R5
Ri = R2
Ci = C2
Rb = R1
Rin = R3
Cin = C1

Schematic LM3886 amp circuit diagram #Minimus Gainclone 70W

Schematic Lm3886 Amplifier Board Circuit Diagram #Minimus Gainclone 70W
Schematic Lm3886 Amplifier Board Circuit Diagram #Minimus Gainclone 70W

Suggested PCB printed circuit board LM3886 amplifier board circuit diagram

Suggested Pcb Bottom Printed Circuit Board Lm3886 Amplifier Board Circuit Diagram
Suggested Pcb Bottom Printed Circuit Board Lm3886 Amplifier Board Circuit Diagram
Suggested Pcb Top Printed Circuit Board Lm3886 Amplifier Board Circuit Diagram
Suggested Pcb Top Printed Circuit Board Lm3886 Amplifier Board Circuit Diagram
Suggested Pcb Component View Top Printed Circuit Board Lm3886Tf Amplifier Board Circuit Diagram
Suggested Pcb Component View Top Printed Circuit Board Lm3886Tf Amplifier Board Circuit Diagram
Suggested Pcb Component View Top Silk Printed Circuit Board Lm3886Tf Amplifier Board Circuit Diagram
Suggested Pcb Component View Top Silk Printed Circuit Board Lm3886Tf Amplifier Board Circuit Diagram

Buy kits LM3886 amp in AliExpress with free Shipping in the Worldwide.

BOM to assemble LM3886 amp Minimus power

Last Update: 10/11/2021 15:49

PartValueDescriptionQuantity
Capacitors
C11µF (105)Polyester Capacitor1
C222µF/50VElectrolytic Capacitor1
C3220pF (221)Ceramic Capacitor1
C4, C9100n (104)Ceramic Capacitor2
C10100n (104)Polyester Capacitor1
C547pF (470)Ceramic Capacitor1
C6, C7, C8100µF/50VElectrolytic Capacitor3
Miscellaneous
OUTAudio OutputTerminal block 2 pin 5.08 mm1
INAudio InputTerminal block 2 pin 5.08 mm1
DCDC power supplyTerminal block 2 pin 5.08 mm1
Semiconductors
IC1LM3886T LM3886TFAudio amplifier integrated circuit1
Resistors 1/4W
R1, R21kBrown, Black, Red, Gold2
R3, R5, R622kRed, Red, Orange, Gold3
R447kYellow, Violet, Orange, Gold1
R72.7 — 1WRed, Violet, Gold, Gold1
R80.1 — 5W0.1 ohm 5 Watts Ceramic Resistor1
Solder, Wires, PCB, case, symmetrical supply, etc.

Download PDF files of this LM3886 Datasheet, PCB top and bottom, schematic, board component view.

Gerber added

Download PDF

Mirror

Download the Datasheet in PDF and application notes.

Model for simulation

Buy DIY kit LM3886 in AliExpress with free Shipping in the Worldwide.

How useful was this post?

Click on a star to rate it!

Average rating / 5. Vote count:

No votes so far! Be the first to rate this post.

As you found this post useful...

Share on the social networks!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Previous

TDA7293 amplifier circuit diagram with PCB

TDA7293 amplifier TDA7294 amplifier circuit #Minimus

Next

5 thoughts on “LM3886 amplifier board #Minimus Gainclone 70W”

  1. On this PCB layout we cant can’t make a circuit , those white line should be black and back should be white and many mistake are der in the board

    Reply
  2. TONI are you sure 1µF – capacitor polyester will work for this , according to me lm3886 support Mkt 2.2uf or 1 uf Audio capacitor like Dayton . Polyester may not work . I tried it work working

    Reply

Leave a Comment