Uploaded July 2021 | Updated September 2026, 3 weeks ago
I'm Stefano also known as “Electronic Projects Stefano91ste” - Here my mission is to show simple Electronic Projects and experiments. In any video you will find circuit diagram, PCB files and explanations, so you can understand it.
Music by Free Vibes
#Electronics #diyprojects #Tutorial
I'm Stefano also known as “Electronic Projects Stefano91ste” - Here my mission is to show simple Electronic Projects and experiments. In any video you will find circuit diagram, PCB files and explanations, so you can understand it.
Music by Free Vibes
#Electronics #diyprojects #Tutorial

![LED Water Level Circuit with ULN2003 - PCB Tutorial
► $2 for 2-Layer PCBs & $7 for 4-Layer PCBs: https://jlcpcb.com
This is a LED circuit for measuring water level, based on ULN2003 a darlington transistor arrays IC. The water level is represented on 7 LEDs, where Red LED indicates lack of water and last green LED indicates 100% of the full tank. This circuit is designed to be used with tap water, do not use it with salt water and any flammable liquid.
Mug with my Logo: https://www.youtube.com/c/Stefano91ste/store
After trying the excellent service offered by JLCPCB I recommend it, the quality of the PCB is high, customer service is always available and professional, the time of realization is short and the delivery of PCBs is by express courier. JLCPCB is a great place to get hight quality custom circuit boards at an extremely low price, you can buy 5 PCB Boards (Any Color) for 2$ !!!
More About JLCPCB: https://support.jlcpcb.com/collection/1-faqs
Components:
- 1x ULN2003 IC [ https://bit.ly/3j9ZZpR ]
- 1x 16 pin DIP [ https://bit.ly/3kc9Ixw ]
- 8x 1K Resistors [ https://bit.ly/2ytgn3e ]
- 7x LED 5mm [ https://bit.ly/2UzRDgR ]
- 1x LED 3mm [ https://bit.ly/39vXOd0 ]
- Wire (Like IDE cable)
- PCB: (Ready for jlcpcb.com): https://bit.ly/3j2yYEH
*Dont use my PCB for profit or sponsored videos.
This circuit must be powered with 12V DC, below I leave the references to view: the electronic circuit diagram, the PCB and the Gerber file to be uploaded directly on the JLCPCB website.
For any other questions you can ask me for explanations in the video comments:)
Chapters:
0:00 - Intro
2:22 - Unboxing
3:03 - Assembly
5:42 - Test
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
✅ YouTube: https://www.youtube.com/c/Stefano91ste
✅ Instagram: https://www.instagram.com/Stefano91ste
✅ Pinterest: https://www.pinterest.it/Stefano91ste
✅ My STORE: https://www.youtube.com/c/Stefano91ste/store
Watch another video =)
● Music Keyboard: https://youtu.be/ajtR6eDOaQI
● LED Water Level: https://youtu.be/n9GB0nfwG8s
● Police Light: https://youtu.be/PtmEqcRbu4w
● Vu-Meter Stereo: https://youtu.be/l8oUQpGAOCw
● Traffic Light: https://youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: https://youtu.be/oWB2faToGAA
● Voltage Detector: https://youtu.be/yRWRsSASQTc
WARNING: This video is only for demonstration. I dont take any responsibility.
#Water #Circuit #LED LED Water Level Circuit with ULN2003 - PCB Tutorial](https://i.ytimg.com/vi/iPYb2b1PauY/mqdefault.jpg)
![LED Vu-Meter with Microphone LM3915 & LM386 - PCB Tutorial
► $2 for 1-4 Layer PCBs, Get SMT Coupons: https://jlcpcb.com/DYE
This Vu-Meter with LM3915 integrates an LM386 amplifier and a microphone, so that it can work without having to be physically connected to any audio source. As LED display I used a bargraph (Model: KYX-B10G). The sensitivity of the microgon (GAIN) is adjustable by means of a 10KΩ trimmer placed on the PCB. The Vu-Meter must be powered with a voltage between 5v and 12v DC, and the maximum current absorption is equal to 100mAh. There is also a 1N4007 diode in the circuit which protects the Vu-Meter from short circuits during power supply phase.
● Components:
1x LM3915 IC
1x LM386 IC
1x 10 LED Bargraph (Model: KYX-B10G)*
1x Microphone Capsule
1x 3mm LED (any color)
1x DIP 18 PIN (for LM3915)
1x DIP 8 PIN (for LM386)
1x 1uF Electrolytic Capacitor (25-100v)
2x 10uF Electrolytic Capacitor (25-100v)
1x 100uF Electrolytic Capacitor (25-100v)
1x 10nF Polyester Capacitor
1x 47nF Ceramic Capacitor
2x 1N4007 Diode
1x 50Ω ¼W Resistor
1x 1KΩ ¼W Resistor
3x 2,7KΩ ¼W Resistors
2x 100KΩ ¼W Resistors
1x 10KΩ Trimmer
1x 9V battery Plug (or two PIN/wires)
1x Two PIN for Dot/Bar Mode
1x PIN Bridge with two PIN
1x Trimmer knob (not mandatory)
* I used a 10 Green LED Bargraph (Model: KYX-B10G) but you can use a Bargraph of different colors, as long as it respects the pinouts of this model.
● Equipment:
- Tin Wire (with integrated flux)
- FLUX (extra FLUX if you need to use it)
- Soldering Iron
- Wire cutters
● PCB: (Ready for jlcpcb.com): https://drive.google.com/file/d/1gua93or_xLqqXsX5O4gPY4L0azWS49jc/view?usp=sharing
*Dont use my PCB for profit or sponsored videos.
● Features:
Range: 30dB (3dB for LED)
Power Supply: 9-12v DC
Absorbed current (MAX): 100mA/h
Weight (assembled): 20g
PCB Layer: 2
PCB Size: 33x67 mm
PCB Thickness: 1,6 mm
Screw fixing holes: 4x 2 mm
Short circuit protection: YES (with a 1N4007 Diode)
Cool design: YES
Adjustable GAIN (by 10KΩ Trimmer)
- About LM3915:
LM3915 is a monolithic integrated circuit that detects analog voltage levels and drive ten LEDs, LCDs or vacuum fluorescent displays, supplying a logarithmic 3 dB/step analog display which can be calibrated logarithmically and is suitable for log measurements as logarithmic bar graph driver.
- About LM386:
LM386 is an integrated circuit containing a low-voltage audio power amplifier.It is suitable for battery-powered devices such as radios, guitar amplifiers, and hobby electronics projects. It can output 0.25 to 1 watts of power and has an impedance of 8Ω
- About 4mm LED:
It is a LED with a diameter of 4 mm, an unusual size. I found this LED on an old board taken from trash. I havent found any others on the market.. dont worry, you can use a 3 mm LED!
- About Microphone Connector:
The microphone connection pad on this PCB was designed by me to allow the connection of different types of microphone capsules. Just be very careful in respecting the polarity + and - of the microphone.
► PROS and CONS of use a Vu-Meter with mic instead a standard one:
🟢 PROS: Portability, Not physically connected to the Amp, So cool!
🔴 CONS: Less accurate measurement than cable
For any other questions ask me in the video comments:)
✅ Subscribe to my YouTube channel Its FREE!
Chapters:
0:00 - Intro
0:34 - Circuit Explanation
2:03 - JLCPCB Factory
2:25 - PCB Upload
3:05 - Unboxing
3:40 - Start PCB Assembly
6:45 - Assembly Completed
7:00 - Music Test
7:50 - Circuit Diagram
7:55 - END
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
✅ YouTube: https://www.youtube.com/c/Stefano91ste
✅ Instagram: https://www.instagram.com/Stefano91ste
✅ Pinterest: https://www.pinterest.it/Stefano91ste
✅ My STORE: https://www.youtube.com/c/Stefano91ste/store
Watch another video =)
● Music Keyboard: https://youtu.be/ajtR6eDOaQI
● LED Water Level: https://youtu.be/n9GB0nfwG8s
● Police Light: https://youtu.be/PtmEqcRbu4w
● Vu-Meter Stereo: https://youtu.be/l8oUQpGAOCw
● Traffic Light: https://youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: https://youtu.be/oWB2faToGAA
● Voltage Detector: https://youtu.be/yRWRsSASQTc
WARNING: This video is only for demonstration. I dont take any responsibility.
Test Music: Elektronomia - Sky High [NCS Release]
( https://youtu.be/TW9d8vYrVFQ ) - Copyright-free Music
#LM3915 #diyprojects #VuMeter LED Vu-Meter with Microphone LM3915 & LM386 - PCB Tutorial](https://i.ytimg.com/vi/imeEG9M_QDo/mqdefault.jpg)






![Easy Traffic Light circuit with Transistor BC547🚦
in this video we are going to make a very simple traffic light circuit, we used three transistors BC547 and other simple composts..
This circuit will flash three LEDs, You can change time interval with change the capacitors. More power capacitor decrease speed and less power capacitor increases the speeds. You can also connect variable resistor on the place of 100K resistor to adjust the time interval as want. In fact, as you can see in the diagram, one of the three capacitors is 100uF while the other two are 220uF. The 100uF capacitor allows yellow LED to stay on for less time than the other two LEDs..
Components List:
- 3x 5mm LED [ https://bit.ly/2UzRDgR ]
- 5x BC547 NPN Transistors [ https://bit.ly/3cJtc9u ]
- 3x 2.7K Resistors [ https://bit.ly/2ytgn3e ]
- 3x 100K Resistors [ https://bit.ly/2ytgn3e ]
- 2x 220uF Electrolytic Capacitors [ https://bit.ly/2WlIgCt ]
- 1x 100uF Electrolytic Capacitor [ https://bit.ly/2WlIgCt ]
- 1x Bradboard [ https://bit.ly/3b2zv7k ]
- Power this circuit with 9-12V DC
- Electric Diagram at: 1:45
*use 25/50/100V Electrolytic Capacitor
Chapters:
0:00 - Intro
1:08 - Test
1:45 - Circuit Diagram
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
Watch another video =)
● Music Keyboard: https://youtu.be/ajtR6eDOaQI
● Water Level indicator: https://youtu.be/n9GB0nfwG8s
● Police Light: https://youtu.be/kG2LQmEtqZo
● Electric Field Detector: https://youtu.be/4nS8xujHZT8
● Vu-Meter Stereo: https://youtu.be/l8oUQpGAOCw
● Traffic Light: https://youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: https://youtu.be/oWB2faToGAA
● Voltage Detector: https://youtu.be/yRWRsSASQTc
● NE555 Signal Generator: https://youtu.be/iYP3Db3jyOQ
Follow me ♥
- YouTube: https://www.youtube.com/c/Stefano91ste
- Instagram: https://www.instagram.com/Stefano91ste
- Pinterest: https://www.pinterest.it/Stefano91ste
● If youd like to support the channel:
- Like, Subscribe, Comment and Share :)
- My STORE: https://www.youtube.com/c/Stefano91ste/store
■ Do you want to Make a PCB?
Look this: https://youtu.be/l8oUQpGAOCw
WARNING: This video is only for demonstration. I dont take any responsibility for damage to things, people and animals.
#Electronic #Easy #Projects Easy Traffic Light circuit with Transistor BC547🚦](https://i.ytimg.com/vi/kOlmGUwj_dk/mqdefault.jpg)
