The LM4871 is a mono BTL type of audio amplifier IC The BTL means bridge tied Load and the IC delivers 3 watts output on 3 ohms speakers. the input DC supply voltage is around 3V to 5.5V. In 8 Ohms speakers it produce 1 Watt audio power. This article shares the LM4871 circuit diagram and additional information’s.
What is LM4871 Mono BTL IC?
- ✔ BTL IC.
- ✔ 3 Watt power on 3 ohms speaker.
- ✔ Supply voltage is 3 to 5.5V DC.
- ✔ External gain configuration capability.
LM4871 Circuit Diagram
This circuit doesn’t need a bootstrap capacitor, snubber circuit or output coupling capacitors. Two op amps internally connected and gives a bridge power output to the speakers. The circuit consist of very minimal number of external components.
Components Required
| Reference | Component Name | Value / Specification |
|---|---|---|
| U2 | LM4871 | Mono Audio Amplifier IC |
| R1 | Resistor | 22 k |
| R2 | Resistor | 20 k |
| C1 | Capacitor (Electrolytic) | 1 uF |
| C2 | Capacitor | 0.39 uF |
| C3 | Capacitor (Electrolytic) | 1 uF |
| LS1 | Speaker | 3 W / 3 ohms |
| – | Power Supply | 3 to 5 V DC |
| – | AUX Input | Audio signal input |
