Let’s take a look at the LM3886 Amplifier circuit. The LM3886 IC is available in any local electronics market, because it is a most popular hi-fi audio amplifier IC. This article will cover the circuit diagram, PCB layout and its general instructions to build a 3886 IC based audio amplifier.
This is a high performance amplifier circuit and board. The sound quality of lm3886 is excellent because of the low signal to noise ratio of 92db at 2 microvolt. The single ic amplifier board is a simple and compact one, so easy to install on any amplifier cabinets.
Also Check : Power supply circuit for Amplifiers
The input voltage has no need to exceed 35v dual supply DC volt. I suggest using a 27-0-27 transformer for providing the power supply. The IC will produce much high heat on the back side, so you need to attach the IC with a good quality aluminum heatsink.
LM3886 amplifier circuit diagram
Components list
- LM3886 IC.
- 1uf, 100uf, 4.7uf ( non polar capacitor ).
- 100nf capacitor
- 100k, 10k, 47k, 10R, 10k, 220k Resistors.
- 4A fuse
- 0.7uh inductor coil.
LM3886 IC pinout
| PIN NUMBER | PIN FUNCTION |
| 1 | V+ supply voltage |
| 2 | Not connected |
| 3 | Speaker output |
| 4 | V- Supply |
| 5 | V+ Supply voltage |
| 6 | Not connected |
| 7 | Ground |
| 8 | Mute |
| 9 | -ve Input signal |
| 10 | +ve Input signal |
| 11 | Not connected |
Features of LM3886 amplifier
- Output RMS of 68 watt at 4 ohm load.
- 0.1% of total harmonic distortion (low noise in output).
- You can use 4 ohms or 8 ohms speakers on this circuit.
- Standard components are used in this circuit, so you can find these all from the local market.
- Low cost to build a mono amplifier.
- Best circuit for diy projects.
- Excellent sound quality with low noise.
