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Speaker Protection With Active, Protect, Clip And Signal


1. 5×10KΩ resistor 1/4W.
2. 2×1KΩ resistor 1/4W.
3. 1×39KΩ resistor 1/4W.
4. 1×47KΩ resistor 1/4W.
5. 1×4.7KΩ-10KΩ resistor 2W.
6. 6×Diode 1N4007.
7. 1×Zener Diode 1N4148.
8. 1×Zener Diode 1N4744A (15V 1W).
9. 1×Transistor C9013.
10. 2×Transistor C945/ C1815.
11. 2×Transistor 2N5551.
12. 4×LED 3 mm.
13. 1×Preset 100K-220K.
14. 2×2 pin connecter base 2.54 mm.
15. 2×220uF capacitor 25V.
16. 4×6.3 mm vertical PCB terminal.
17. 1×Relay 12V 30A.

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 Speaker Protection

Hello Friends, in this post I make a 500 Watts mono amplifier. This is a class AB mono amplifier. Which can deliver up to 650 Watts RMS output at 4Ω ±65V, Test frequency 1khz. And 500 Watts RMS output at 8Ω ±70V, Test frequency 1khz. For this amplifier I used 5 pair of 2SC5200 and 2SA1943 Transistor. 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 Green 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 Speaker Protection

After complete this speaker protection, touch the input terminal with a voltage wire, if the relay cutout the supply then the speaker protection is working properly. And for test Signal and Clip indicator, connect it with any power amplifier. Then play 1KHz sine wave frequency on amplifier. And then check output signal on this indicator. Check all LED step by step, by increase or decrease resistance of input potentiometer.

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