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100 Watt amplifier with speaker Protection.



1. 3×10KΩ resistor 1/4W.
2. 2×1KΩ resistor 1/4W.
3. 1×100KΩ resistor 1/4W.
4. 1×2.2KΩ resistor 1/4W.
5. 2×4.7KΩ resistor 1/4W.
6. 1×39KΩ resistor 1/4W.
7. 1×22KΩ resistor 1/4W.
8. 1×47KΩ resistor 1/4W.
9. 2×10Ω resistor 1/2W.
10. 2×0.33Ω resistor 5W.
11. 2×Zener diode 1N4148.
12. 5×Diode IN4007.
13. 2×Led Green, Red.
14. 2×2N5401 Transistor.
15. 1×C9013 Transistor.
16. 2×C945/ C1815 Transistor.
17. 2×BD139 Transistor.
18. 1×BD140 Transistor.
19. 1×2SC5200 Transistor.
20. 1×2SA1943 Transistor.
21. 1×330pF (331) capacitor 100V.
22. 2×0.1uF (104) capacitor 100V.
23. 2×10uF capacitor 63V.
24. 2×220uF capacitor 25V.
25. 2×4700uF capacitor 50V.
26. 1×Preset 100K-220K.
27. 2×2 pin connecter base 2.54 mm.
28. 1×Bridge Rectifier GBU808/ GBU1508.
29. 1×3 Pin screw terminal.
30. 1×2 Pin screw terminal.
31. 1×Relay 12V 10A.

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 a 100 Watts mono amplifier. This is a class AB mono amplifier. Which can deliver up to 120 Watts RMS output at 4Ω ±30V, Test frequency 1khz. And 70 Watts RMS output at 8Ω ±35V, Test frequency 1khz. For this amplifier I used 1 pair of 2SC5200 and 2SA1943 Transistor. This amplifier have have in-built Speaker protection. So if for some reason the transistor will burn, this built-in speaker protection circuit will protect the Speaker from high DC voltage. 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 Red 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:- Bias volt 0.5V to 0.7V. 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:- Recommended transformer 30-0-30V 5A.

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