Vu-Meter 20 LED Dot/Bar 60dB with LM3915 - PCB Tutorial 

► $2 for 2-Layer PCBs & $7 for 4-Layer PCBs: jlcpcb.com
This is my new Vu-Meter with 20 LED on PCB that integrates DOT/BAR switch and High Level LED!
This Vu-Meter is powered at 9-12V DC, has a range of 60dB and is connected to a pre-amplifier or directly to the amplifier outputs (like a speaker). As Driver I used two LM3915 (logarithmic ICs) cascated, in order to drive 20 LEDs.. each LED represents 3dB. The "HIGH" LED is connected in parallel with LED 19, This LED is a precaution to indicate that the measured Audio Level is very high
After trying the excellent service offered by JLCPCB I recommend it, the quality of the PCB is high, customer service is always available and professional, the time of realization is short and the delivery of PCBs is by express courier. JLCPCB is a great place to get hight quality custom circuit boards at an extremely low price, you can buy 5 PCB Boards (Any Color) for 2$ !!!
Components for this PCB:
- 2x LM3915 IC
- 2x DIP 18 PIN
- 2x LED 3mm
- 20x LED 5mm
- 1x 10Ω Resistor
- 3x 1KΩ Reistors
- 1x 33KΩ Resistor (or 100KΩ)
- 5x 2.7KΩ Resistors
- 1x 1uF 25/50/100V Electrolytic Capacitor
- 1x 100uF 25/50/100V Electrolytic Capacitor
- 1x 1N4007 Diode
- 3x PIN for DOT/BAR Mode
- 4x PIN for VCC - GND - Signal
- 1x 10cm of Metal Wire
- 1x PCB (Link below)
- PCB: (Ready for jlcpcb.com): bit.ly/37iwwaG
*Don't use my PCB for profit or sponsored videos.
*In the PCB shown in the video I UPDATE the values of two resistors:
- The 330Ω resistor is now 1KΩ.
- The 100KΩ resistor can be set at will between a value of 33KΩ and 100KΩ (for example, if without audio signal, one or two LEDs remain ON, use a value lower than 100KΩ but not less than 33KΩ).
- Obviously the PCB you can download from here has already been updated!
Components If you prefer to assemble the circuit on breadboard, matrix board etc with the circuit displayed in the video:
- 2x LM3915 IC
- 2x DIP 18 PIN
- 1x LED 3mm
- 20x LED 5mm
- 1x 10Ω Resistor
- 2x 1KΩ Reistors
- 1x 33KΩ Resistor (or 100KΩ)
- 4x 2.7KΩ Resistors
- 1x 1uF 25/50/100V Electrolytic Capacitor
- 1x 100uF 25/50/100V Electrolytic Capacitor
- 1x 1N4007 Diode
- 1x button for DOT/BAR Mode
PCB Dimensions: 42x141 mm
This circuit must be powered with 9-12V DC
For any other questions you can ask me for explanations in the video comments:)
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Chapters:
0:00 - Intro
0:37 - Circuit Diagram
0:53 - JLCPCB
1:21 - How to Order
2:00 - Unboxing
2:45 - Assembly
3:07 - Resistor Change
3:22 - Assembly
5:16 - TEST BAR Mode
6:12 - TEST DOT Mode
6:23 - TEST BAR Mode
7:21 - END
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WARNING: This video is only for demonstration. I don't take any responsibility.
#LM3915 #VuMeter #PCB

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