Monday, January 14, 2019

High-End LM1876 Quad Amplifier Gainclone using High Quality PCB

LM1876 Quad (4 Channel) Amplifier Gainclone

Creating a power amplifier circuit for the high-end class AB using the LM1876 IC is in great demand among audio amplifier lovers. Amplifiers using the LM1876 IC have power up to 20W per channel, while the LM1876 IC has 2 input outputs so that it can output 20W + 20W per IC, with very low distortion compared to other amplifier chips. This LM1876 IC is the same as the LM1875 IC with the same audio quality produced. The difference is only in the number of output inputs and also features a mute and standby feature on the LM1876 IC.

You can use this amplifier for home theater or audiophile amplifiers, or it can also be applied to system power amplifier circuits 2.1 Stereo + Subwoofer using 2 ICs. And on this occasion, I will share the circuit and the PCB layout file for the LM1876 Quad amplifier circuit or 4 channel power amplifier using 2 ICs. Besides that, I have also completed the preamplifier circuit along with the power supply regulator for the IC op-amp. The Op-Amp IC that I use is dual type. You can use several types of op-amps such as 4558, NE5532, TL082, etc. Recommended power supply using +-25V with 5A Current.
Below is the LM1876 series of quad amplifier circuits:

Schematic LM1876 Quad (4 Channel) Amplifier Gainclone High-End
Part List
LM1876TF U1,U2 TF15B
1k R1,R3,R4,R5,R11,R13,R14,R15,R25,R26,R32,R33,R37,R38 PKG-0.25W RESISTOR
47k R2,R6,R12,R16 PKG-0.25W RESISTOR
10uF C1,C2,C9,C10 CAP-D5.0XF2.0
1000uF C3,C4,C11,C12 CAP-D16.0XF7.5
1uF C5,C6,C13,C14 CAP-CBB-23.0*8.0
100nF C7,C8,C15,C16 CAP-CBB-12.0*4.5
4.7Ω R7,R8,R17,R18 AXIAL-0.8
22k R9,R10,R19,R20,R24,R31 PKG-0.25W RESISTOR
555 U3,U4 DIP08
10k R21,R22,R28,R29 PKG-0.25W RESISTOR
4k7 R23,R30 PKG-0.25W RESISTOR
50k R27,R34 RES-ADJ_3296W
MKP 250V 2.2uF C20,C18,C17,C19 CAPACITOR-MKP250V-2.2UF
100NF C21,C22,C23,C24 100NF, 63V CAPACITOR
AKL701_3_15 X1 AKL701_3_15
BD140_C20604 Q1 TO-126
BD139 Q2 TO-126
Z12V D2,D3 ER_ZENER_12V_D0-35
22uF C35,C36 CAP-D6.3XF2.5
100uF C37,C38 CAP-D6.3XF2.5
100n C39,C40 100NF, 63V CAPACITOR
XHB-2A Connector P1,P2,P3,P4 XHB-2A
1M R39,R40,R41,R42 PKG-0.25W RESISTOR

PCB Layout LM1876 Power Amplifier Quad Gainclone
PCB Layout LM1876 Quad (4 Channel) Amplifier Gainclone High-End

How to get High-Quality PCB from JLCPCB 
First, you must download the Gerber file at end of this post.
If you have downloaded it via google drive with the .rar format, please visit the JLCPCB site here:

Here is the website homepage of JLCPCB, next login to your account or register if you don't have JLCPCB account.
JLCPCB website homepage

If you have already entered the account, click quote now. And then upload the Gerber Files
How to uploading Gerber files on JLCPCB

Uploading gerber files JLCPCB
Then select your PCB options such as number of PCBs to be ordered, PCB thickness, copper thickness, masking color etc.
PCB option at
Then click save to cart, and checkout securely, and you will be redirected to the page to fill in the shipping address, and shipping options and payment options. You can use a credit card or PayPal to pay it.
How to pay JLCPCB

The following is an example of a PCB that I have ordered from JLCPCB with a red double layer masking PCB, HASL (with Lead) surface finish.
PCB Review from JLCPCB LM1876 gerber files

Using a high-quality PCB from JLCPCB and using the Audio Grade component makes it possible to get good results for this LM1876 Power Amplifier. Apart from good sound results we also get a cool look too.

Gerber Files Power Amplifier Quad LM1876 High-End Audio
Bill of Materials Quad Gainclone Amplifier LM1876 .CSV

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.