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
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1LM1876TFU1,U2TF15B
21kR1,R3,R4,R5,R11,R13,R14,R15,R37,R38PKG-0.25W RESISTOR
347kR2,R6,R12,R16PKG-0.25W RESISTOR
410uFC1,C2,C9,C10CAP-D5.0XF2.0
51000uFC3,C4,C11,C12CAP-D16.0XF7.5
61uFC5,C6,C13,C14CAP-CBB-23.0*8.0
7100nFC7,C8,C15,C16CAP-CBB-12.0*4.5
84.7ΩR7,R8,R17,R18AXIAL-0.8
922kR9,R10,R19,R20,R24,R26,R31,R33PKG-0.25W RESISTOR
105532U3,U4DIP08
1110kR21,R22,R23,R25,R28,R29,R30,R32PKG-0.25W RESISTOR
1250kR27,R34RES-ADJ_3296W
13MKP 250V 2.2uFC20,C18,C17,C19CAPACITOR-MKP250V-2.2UF
14100NFC21,C22,C23,C24100NF, 63V CAPACITOR
15AKL701_3_15X1AKL701_3_15
16TB 5MMOUT4,OUT1,OUT2,OUT3TERMINAL_BLOCK_2P_5
17BD140_C20604Q1TO-126
18BD139Q2TO-126
19Z12VD2,D3ER_ZENER_12V_D0-35
2022uFC35,C36CAP-D6.3XF2.5
21100uFC37,C38CAP-D6.3XF2.5
22100nC39,C40100NF, 63V CAPACITOR
23XHB-2A ConnectorP1,P2,P3,P4XHB-2A
241MR39,R40,R41,R42PKG-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:https://jlcpcb.com/m

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 JLCPCB.com
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.

Amplifier Test





Download
Schematic LM1876 Quad Amplifier PDF
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.

1 Comments so far

Hi, very nice work.
would you mind to share the easyeda files ? the traces look weird but maybe for good reasons.
Thanks


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