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TL494 Class D 500 Watt Amplifier.


1. 2×47KΩ resistor 1/4W.
2. 1×10KΩ resistor 1/4W.
3. 1×1KΩ resistor 1/4W.
4. 1×8.2KΩ resistor 1/4W.
5. 1×2.2Ω resistor 1/4W.
6. 2×470Ω resistor 1/4W.
7. 2×56Ω-68Ω resistor 1/4W.
8. 4×Zener diode 1N4148.
9. 2×0.001uF (102) capacitor 100V.
10. 1×0.0022uF (222) capacitor 100V.
11. 1×0.1uF (104) capacitor 100V.
12. 2×1uF (105) capacitor 250V.
13. 1×1uF capacitor 63V.
14. 2×10uF capacitor 63V.
15. 3×1000uF capacitor 63V.
16. 1×TL494CN IC.
17. 1×BD140 Transistor.
18. 2×BD139 Transistor.
19. 2×2 pin connecter base 2.54 mm.
20. 4×6.3 mm vertical PCB terminal.
21. 2×MOSFET IRFP250N/ IRFP260N.
22. 1×Coil 30-35uH.

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.

PCB Layout & Schematic:-

Lets Build This Amplifier

Hello Friends, In this post I make a 500 Watt mono amplifier using IRFP260N MOSFET and TL494 IC. For make coil of this amplifier, must use LCR meter. Because 50% sound clarity is depended on it's coil, and 50% on circuit. Wrong coil can getting hot, and it may burn out MOSFET. 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 Yellow 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.

Check Voltages:- Check Speaker Output and Audio Input voltage. Here you get no voltages 0.00V. If you get same voltages, then connect preamplifier to input and connect speaker to output.

Power Supply:- This amplifier can work minimum 24VDC. But for get best performance of this amplifier, you use 45VDC-50VDC 10-12A SMPS power supply.

Post a Comment


  1. Hi sir,
    Where do you buy all these components? I don't even get many components.