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Preamp Board For Microphone 0-12V


1. 4×10KΩ resistor 1/4W.
2. 2×20KΩ resistor 1/4W.
3. 1×680Ω resistor 1/4W.
4. 1×100KΩ resistor 1/4W.
5. 1×1KΩ resistor 1/4W.
6. 4×Diode 1N4007.
7. 1×LED 3mm.
8. 1×Capacitor 22pF(22).
9. 1×Capacitor 0.1uF(104).
10. 3×1uF capacitor 50V.
11. 1×10uF capacitor 50V.
12. 1×47uF capacitor 25V.
13. 1×2200uF capacitor 25V.
14. 1×UA741/TL071 IC.
15. 2×3 pin connector base 2.54 mm.
16. 2×2 pin connector base 2.54 mm.
17. 1×L7812 +V Regulator.
18. 1×100K single turn Potentiometer.

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 Preamplifier

Hello Friends, in this post I make preamp board for "Dynamic" microphone. For this preamplifier I have used UA741 IC. But in place of UA741 IC, you can also use TL071 IC. 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 Preamplifier

Check Voltages:- Check Audio 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 0-12V 750mA to 1A.

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