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:
PCB Layout LM1876 Power Amplifier Quad Gainclone
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.
If you have already entered the account, click quote now. And then upload the Gerber Files
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.
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.
Schematic LM1876 Quad Amplifier PDF
Gerber Files Power Amplifier Quad LM1876 High-End Audio
Bill of Materials Quad Gainclone Amplifier LM1876 .CSV