Uploaded November 2020 | Updated September 2026, 3 weeks ago
► WANNA SEE YOU 2020 (JLCPCB E-exhibition) ◄
LINK: jlcpcb.com/E-exhibition
This small circuit is able to converting an alternating current to direct (AC to DC) and stabilize it at 5V, the circuit is completely self-built on a matrix board and is capable of delivering a maximum current of 1A
- How does it work?
The voltage is converted from AC to DC thanks to this Graetz bridge, formed by four 1N4007 Diodes
I decided to put a Diode 1N4007 to separate the Graetz bridge from the LM7805 this in case it was necessary to add an extra capacitor to the circuit or a battery (in case of H24 applications)
LM7805 is a small 3-pin integrated circuit also called voltage regulator, able to receiving a voltage input up to a maximum of 30V DC and output a stable voltage (DC) at 5V (up to a maximum of 1.5A)
Components:
- 1x Transformer (MAX Out 1A)
- 5x 1N4007 Diode
- 1x LM7805 Voltage Regulator
- 1x Heatsink for LM7805
- 1x LED 5mm (or 3mm)
- 1x 1KΩ Resistor
- 1x 100uF @ 50/100V Electrolytic Capacitor
■ About WANNA SEE YOU 2020‼️
We missed a precious chance to see users in Munich exhibition this year, so we prepare such exhibition and activity for virtually communicate with JLCPCB users on online exhibition and give every attendee 100% chance of winning Gift!
● When: November 10 - 25
● Where: jlcpcb.com/E-exhibition
●How to join in?
- Enter the webpage to choose your favorite guide
- Browse 3 showrooms in order and get 3 gifts
- Share your experience then get a "Spin to win" chance (100% possibility win gifts)
- Prizes include iPhone 12, 3D Printer, Instant Camera, $50 Amazon gift card, cash dollar coupons, etc.
✅ Subscribe to my YouTube channel It's FREE!
✅ Visit JLCPCB: jlcpcb.com
Chapters:
0:00 - Intro
0:23 - JLCPCB E-exhibition
1:04 - Explanation
1:54 - Test
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
✅ YouTube: youtube.com/c/Stefano91ste
✅ Instagram: instagram.com/Stefano91ste
✅ Pinterest: https://www.pinterest.it/Stefano91ste
✅ My STORE: youtube.com/c/Stefano91ste/store
Watch another video =)
● Music Keyboard: youtu.be/ajtR6eDOaQI
● LED Water Level: youtu.be/n9GB0nfwG8s
● Police Light: youtu.be/PtmEqcRbu4w
● Vu-Meter Stereo: youtu.be/l8oUQpGAOCw
● Traffic Light: youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: youtu.be/oWB2faToGAA
● Voltage Detector: youtu.be/yRWRsSASQTc
WARNING: This video is only for demonstration. I don't take any responsibility.
#ACDC #JLCPCB #Electronics
► WANNA SEE YOU 2020 (JLCPCB E-exhibition) ◄
LINK: jlcpcb.com/E-exhibition
This small circuit is able to converting an alternating current to direct (AC to DC) and stabilize it at 5V, the circuit is completely self-built on a matrix board and is capable of delivering a maximum current of 1A
- How does it work?
The voltage is converted from AC to DC thanks to this Graetz bridge, formed by four 1N4007 Diodes
I decided to put a Diode 1N4007 to separate the Graetz bridge from the LM7805 this in case it was necessary to add an extra capacitor to the circuit or a battery (in case of H24 applications)
LM7805 is a small 3-pin integrated circuit also called voltage regulator, able to receiving a voltage input up to a maximum of 30V DC and output a stable voltage (DC) at 5V (up to a maximum of 1.5A)
Components:
- 1x Transformer (MAX Out 1A)
- 5x 1N4007 Diode
- 1x LM7805 Voltage Regulator
- 1x Heatsink for LM7805
- 1x LED 5mm (or 3mm)
- 1x 1KΩ Resistor
- 1x 100uF @ 50/100V Electrolytic Capacitor
■ About WANNA SEE YOU 2020‼️
We missed a precious chance to see users in Munich exhibition this year, so we prepare such exhibition and activity for virtually communicate with JLCPCB users on online exhibition and give every attendee 100% chance of winning Gift!
● When: November 10 - 25
● Where: jlcpcb.com/E-exhibition
●How to join in?
- Enter the webpage to choose your favorite guide
- Browse 3 showrooms in order and get 3 gifts
- Share your experience then get a "Spin to win" chance (100% possibility win gifts)
- Prizes include iPhone 12, 3D Printer, Instant Camera, $50 Amazon gift card, cash dollar coupons, etc.
✅ Subscribe to my YouTube channel It's FREE!
✅ Visit JLCPCB: jlcpcb.com
Chapters:
0:00 - Intro
0:23 - JLCPCB E-exhibition
1:04 - Explanation
1:54 - Test
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
✅ YouTube: youtube.com/c/Stefano91ste
✅ Instagram: instagram.com/Stefano91ste
✅ Pinterest: https://www.pinterest.it/Stefano91ste
✅ My STORE: youtube.com/c/Stefano91ste/store
Watch another video =)
● Music Keyboard: youtu.be/ajtR6eDOaQI
● LED Water Level: youtu.be/n9GB0nfwG8s
● Police Light: youtu.be/PtmEqcRbu4w
● Vu-Meter Stereo: youtu.be/l8oUQpGAOCw
● Traffic Light: youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: youtu.be/oWB2faToGAA
● Voltage Detector: youtu.be/yRWRsSASQTc
WARNING: This video is only for demonstration. I don't take any responsibility.
#ACDC #JLCPCB #Electronics

![Fire Alarm DIY Tutorial with LM358 🔥
This is a Fire Alarm/Sensor! - the core of this simple circuit is the LM358 IC. The heat is detected by a thermistor, a resistor that varies its value as the ambient temperature changes. With the 10KΩ trimmer it is possible to adjust the temperature, at which the alarm will be actived. Finally, the buzzer I used is an active type, a normal buzzer would not sound.
● Components:
- 1x LM358 [ https://bit.ly/2VCFPLy ]
- 1x 10 KΩ Thermistor [ https://bit.ly/2yrIhMG ]
- 1x 10 KΩ Resistor [ https://bit.ly/2ytgn3e ]
- 2x 330Ω Resistors [ https://bit.ly/2ytgn3e ]
- 1x 10 KΩ Trimmer [ https://bit.ly/3cyvozr ]
- 1x Active Buzer [ https://bit.ly/2VisN6H ]
- 2x LED 5mm [ https://bit.ly/2UzRDgR ]
PCB coming soon ;)
■▬▬▬▬▬ 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
● Automatic LED Light: https://youtu.be/fwPQcBr8nwc
● Voltage Detector: https://youtu.be/yRWRsSASQTc
● Music LED with TIP31: https://youtu.be/3qZ3uA8hDmE
● 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
■ My STORE: https://www.youtube.com/c/Stefano91ste/store
● If youd like to support the channel: Like, Subscribe, Comment and Share :)
■ Do you want to Make a PCB?
Look this: https://youtu.be/l8oUQpGAOCw
Music: Light by Vexento
WARNING: This video is only for demonstration. I dont take any responsibility for damage to things, people and animals. Dont play with fire!
#Fire #Alarm #Sensor Fire Alarm DIY Tutorial with LM358 🔥](https://i.ytimg.com/vi/_YVGpxwwtk0/mqdefault.jpg)








![LED Volt Meter LM3914 for Tuning Cars - PCB Tutorial
► $2 for 2-Layer PCBs & $7 for 4-Layer PCBs: https://jlcpcb.com
This circuit is able to indicate the charge level of a battery, and is designed for 12V batteries.. each LED represents 1.2V (12V / 10 LEDs).. and during normal operation the first Red LED indicates 8V while the last Green LED indicates 12V. You can make the calibration of the Volt Meter by put 12V on the circuit and turning the trimmer until all the LEDs turn ON. With the special round design of this PCB we can use as Volt-Meter car Tuning!
What is a voltmeter?
A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog-to-digital converter. Voltmeters are made in a wide range of styles. Instruments permanently mounted in a panel are used to monitor generators or other fixed apparatus. Portable instruments, usually equipped to also measure current and resistance in the form of a multimeter, are standard test instruments used in electrical and electronics work. Any measurement that can be converted to a voltage can be displayed on a meter that is suitably calibrated; for example, pressure, temperature, flow or level in a chemical process plant.
After trying the excellent service offered by JLCPCB I recommend it, the quality of the PCB is high, customer service is always available and professional, the time of realization is short and the delivery of PCBs is by express courier. JLCPCB is a great place to get hight quality custom circuit boards at an extremely low price, you can buy 5 PCB Boards (Any Color) for 2$ !!!
More About JLCPCB: https://support.jlcpcb.com/collection/1-faqs
Components:
- 1x LM3914 IC [ https://bit.ly/3kiRAlF ]
- 1x Dip 18 Pin [ https://bit.ly/3kc9Ixw ]
- 1x 56KΩ Resistor [ https://bit.ly/2ytgn3e ]
- 1x 18KΩ Resistor [ https://bit.ly/2ytgn3e ]
- 1x 10KΩ Trimmer [ https://bit.ly/3cyvozr ]
- 1x 3.9KΩ Resistor [ https://bit.ly/2ytgn3e ]
- 5x Red LED 3mm [ https://bit.ly/39vXOd0 ]
- 2x Yellow LED 3mm [ https://bit.ly/39vXOd0 ]
- 4x Green LED 3mm [ https://bit.ly/39vXOd0 ]
- 1x 1KΩ Resistor (optional) [ https://bit.ly/2ytgn3e ]
- PCB: (Ready for jlcpcb.com): https://bit.ly/30gv59d
*Dont use my PCB for profit or sponsored videos.
My Car Video: https://www.youtube.com/playlist?list=PL 2OB3tNsdQjBnuD6rjFp1fTrsl5LMcf
My Drone Video: https://www.youtube.com/playlist?list=PL 2OB3tNsdQKJ2PqQ_Zj1PeXRv3LVPK9
Chapters:
0:00 - Intro
0:33 - Circuit Explanation
2:30 - JLCPCB Upload
3:07 - Unboxing
4:14 - Volt-Meter Assembly
7:18 - TEST
9:16 - Car TEST
10:16 - END
**JLCPCB have a Technical Support for exporting Gerber files from many software at this link: https://support.jlcpcb.com/category/23-technical-support
For any other questions you can ask me for explanations in the video comments:)
► Subscribe to my Channel: https://www.youtube.com/c/Stefano91ste
■▬▬▬▬▬ 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
● Automatic LED Light: https://youtu.be/fwPQcBr8nwc
● Voltage Detector: https://youtu.be/yRWRsSASQTc
● Music LED with TIP31: https://youtu.be/3qZ3uA8hDmE
● 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
■ My STORE: https://www.youtube.com/c/Stefano91ste/store
● If youd like to support the channel: Like, Subscribe, Comment and Share :)
■ 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.
#LM3914 #Voltmeter #Tuning LED Volt Meter LM3914 for Tuning Cars - PCB Tutorial](https://i.ytimg.com/vi/f-r80nU-Njg/mqdefault.jpg)