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LM1875 IC Stereo Amplifier.


1. 4×10KΩ resistor 1/4W.
2. 7×1KΩ resistor 1/4W.
3. 4×100KΩ resistor 1/4W.
4. 2×22KΩ resistor 1/4W.
5. 2×2.2KΩ resistor 1/4W.
6. 2×1MΩ resistor 1/4W.
7. 2×1Ω-2.2Ω resistor 1/2W.
8. 6×0.1uF (104) capacitor 50V.
9. 2×0.22uF (224) capacitor 50V.
10. 2×22uF capacitor 63V.
11. 2×47uF capacitor 25V.
12. 4×2.2uF capacitor 63V.
13. 1×4558/ NE5532/ TL072 IC.
14. 1×LED 3mm.
15. 1×7812/ 7815 +V Regulator.
16. 1×7912/ 7915 -V Regulator.
17. 2×LM1875 IC.
18. 1×3 pin connecter base 2.54 mm.
19. 1×3 Pin screw terminal.
20. 2×2 Pin screw terminal.
21. 1×GBU808/ GBU1508 Bridge Rectifier.
22. 1×47K/ 100K Dual Gang Potentiometer.
23. 2×4700uF capacitor 35V.

License:- ©Technical Mriganka. You can't use this PCB Layout and Gerber File for commercial purpose. You can use this PCB layout and Gerber file only for Educational and DIY projects.

Lets Build This Amplifier

Hello Friends, In this post I make stereo amplifier, which can deliver up to 18 watt output per channel at 4Ω. For this amplifier I use LM1875 IC. This Amplifier have in-built preamplifier booster, so we can use full power of this amplifier. For designing my PCB, I used EasyEda online software. Then I export the Gerber file (which you can download). And then I go to for manufacturing my PCB. PCBWay are the largest PCB manufacturer in China. They offer Standard PCB, Advanced PCB, Rigid-Flex PCB, SMD-Stencil and PCB Assembly Service. Here you get, 100x100mm 2 Layer PCB only at $5, And processing time within 24 hour. And they distribute, worldwide. The more you order, the less price you have to pay.

You just need to upload the Gerber File, and select the quantity, color, silkscreen, thickness etc. Then select your country, and shipping method and then Pay. PCBWay will deliver your PCB within 7-10 days.

After one week I have received my PCB. You can see the PCB quality, it's awesome. I have ordered Black PCB. But you can choose your PCB color. PCBWay provide total 9 color solder mask - Green, Blue, Red, Purple, Black, White, Yellow, Matte Black and Matte Green. On PCBWay you can get 100x100mm 2 Layer PCB only at $5. Maximum size PCB you can get 500x1100mm. And maximum Layer is up to 14 Layers. And If you order PCB first time at PCBWay, then you get a $5 discount coupon. So upload your Gerber today and get best quality PCB.

Testing Method After Complete This Amplifier

Series light test:- After complete this board don't forget to series light test. When you will on this amplifier via series light, it glow for some time (1 - 2 sec). Then series light will turned off fully. If the series light will fully turned off, then check the voltages.

Power Supply:- Recommended transformer 12-0-12V to 18-0-18V 4A-5A.

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