Circuit power amplifier stereo audio with LM1875 – 2 x 20 watt

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This is an audio amplifier circuit using integrated LM1875 stereo to 2 x 20 Watts. With power supply for ease of assembly for any hobbyist. With a power of up to 20 Watts stereo amplifier that is suitable for use as power audio amplifier in various applications such as power amplifier for PC audio, FM radio, MP3 speaker, finally you’re sure to find great uses for this amplifier with LM1875 easy to assemble.

Diagram of stereo power amplifier lm1875

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circuit Lm1875 stereo power amplifier schematic

Suggested printed circuit board for mounting the amplifier chip LM 1875

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Lm1875 stereo power amplifier PCB
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circuit Lm1875 stereo power amplifier pcb layout
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Lm1875 stereo power amplifier PCB silk

Part List for assembly of a stereo amplifier with LM1875

Parts Value
Capacitors
C1 100nF/63 V Polyester film or ceramic capacitor
C2, C3 3300µF/35V Polarized electrolytic capacitor
C4, C5, C12, C13 2.2µF/25V Polarized electrolytic capacitor
C6, C9 220nF/63V Polarized electrolytic capacitor
C7, C14 10µF/25V Polarized electrolytic capacitor
C8, C11 2200µF/35V Polarized electrolytic capacitor
Semiconductors
D1, D2, D3, D4 1N4004
B1 KBL406 4A Bridge Rectifier or equivalent
LED Red LED 5mm
IC1, IC2 LM1875T
Connectors
IN-L Connector Left channel audio input
IN-R Connector Right channel audio input
OUT-L Connector Left Channel Audio Output
AC Connector to the transformer
OUT-R Connector Right channel audio Output
Resistors 1/4 watt 5%
R1, R6, R12 10k Brown, Black, Orange, Gold
R2, R3, R4, R8, R9, R10 22k Red, Red, Orange, Gold
R5, R11 220K Red, Red, Yellow, Gold
R7, R13 1R Brown, Black, Gold, Gold
Several
J1 – Jumper – piece of wire
Heat sink for the IC, printed circuit board, solder, Box to the amplifier, speakers, 30 watts 4 ohms
Transformer – 12 to 18 VAC / 2A to 3A

Download PDF Files Mounting amp with LM1875
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11 thoughts on “Circuit power amplifier stereo audio with LM1875 – 2 x 20 watt”

  1. This schematic is incorrect. R5 and R11 should go from pin 4 to pin 2 of their respective ICs, not the junction of the 10k resistor and the 2.2uf capacitor. Also, much better performance can be achieved using a centre-tapped transformer and dual-ended supply. See the datasheet’s typical application schematic.

    Reply
  2. 12v dc amplifier stereo audio top hi fi power sistem please sir my numbers 09417825411, 09417812056 please back call me

    Reply
  3. Why my left out make noisy sound, but the right one dont issue anything. That problem can be related with suuply?
    Help !!!!!!!!!!

    Reply

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Crash Course Electronics and PCB Design
Crash Course Electronics and PCB Design
DC circuits, operational amplifiers, EXERCISES, SIMULATIONS
DC circuits, operational amplifiers, EXERCISES, SIMULATIONS