Stereo VU Meter using LM3915N-1

 

Components

1. 2×LM3914/ LM3915 IC.
2. 2×100KΩ resistor 1/4W.
3. 2×1.5KΩ resistor 1/4W.
4. 2×560Ω resistor 1/4W.
5. 2×100KΩ Preset.
6. 2×1N4148 Zener Diode.
7. 4×1N4007 Diode.
8. 14×Led 3 mm (Green).
9. 6×Led 3 mm (Red).
10. 2×4.7uF capacitor 25V/ 50V.
11. 1×7812/ 7809 + voltage regulator.
12. 1×2 pin connector Base/ Socket 2.54 mm.
13. 1×3 pin connector Base/ Socket 2.54 mm.
14. 1×1000uF capacitor 25V.

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.

Gerber File - https://bit.ly/3peDne9

PCB Layout & Schematic - https://bit.ly/3peDu9p

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How to make PCB by ironing method

For make PCB you need PCB layout. Download the PCB layout and print it by laser printer on photo paper. Then cut the PCB layout. Then press the PCB layout by iron on copper clad board. Press the iron 10-15 minutes. Then leave the PCB for cool down 10 minutes. When the PCB will cool, put the PCB in water and move the PCB layout to copper clad board. Then put the PCB in ferric chloride [FeCl3+H2O] for etching 10-15 minutes. when etching will end, clean the PCB by water. Then make hole on PCB. And then press the upper side print of PCB. Now your PCB is ready, mount components by instruction.

How to test this VU Meter

Input - Check Audio Input voltage. Here you get no voltages 0.00V. If you get same voltages, then connect this VU Meter to amplifier.