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5.1 Amplifier LM1875 And TDA7294



1. 11×10KΩ resistor 1/4W.
2. 8×22KΩ resistor 1/4W.
3. 6×1KΩ resistor 1/4W.
4. 5×1MΩ resistor 1/4W.
5. 1×680Ω resistor 1/4W.
6. 5×1Ω resistor 1/2W.
7. 5×2.2uF capacitor 50V.
8. 7×22uF capacitor 50V.
9. 2×10uF capacitor 50V.
10. 4×4700uF capacitor 35V.
11. 5×0.22uF (224) capacitor 50V.
12. 1×0.47uF (474) capacitor 50V.
13. 1×0.1uF (104) capacitor 50V.
14. 5×LM1875 IC.
15. 1×TDA7294 IC.
16. 2×3 pin connecter base 2.54 mm.
17. 2×2 pin connecter base 2.54 mm.
18. 6×2 pin Screw Terminal.
19. 1×3 pin Screw Terminal.
20. 4×100K Dual Channel Potentiometer.
21. 1×Bridge Rectifier GBU1508.
22. 1×3 mm LED.

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.


How I make this Amplifier

Hello guys, in this post I make a 5.1 HI-FI Surround sound Amplifier using TDA7294 and LM1875 IC. This is a class AB amplifier. Which can deliver up to 200 Watts RMS output at 4Ω ±25VDC, Test frequency 1khz. LM185 IC per channel output 20 Watts and TDA7294 IC output 100 Watts, so total 200 Watts RMS. For power supply of this amplifier you can use 18-0-18V 8A-10A Transformer.

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 7 days I have received my PCB. You can see the PCB quality, it's awesome. I have ordered Red color 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.

How to Test 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:- For get best performance of this amplifier, you use 18-0-18V 8A-10A Transformer (Don't increase voltage).

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  1. how do you do to compensate the amperage for the lm1875, when they can only work at maximum 4 amps