Using the ULN2003A Transistor Array with Arduino 

An excellent device, superbly explained. Clear speech and no music. Probably the best tutorial I've ever seen.

Your video is 9 years old but still a gold (other than the cough, ha ah )

Thank you so much for including the diagram at 7:15. I never would have thought to connect the pins for more current.

Just came across this video. Thanks! This was an excellent description of the uln2003's practical use. This helped me, as hobbyist, to understand its function and make a decision on its fitment for my project. Thank you for sharing your expertise! This helps folks like me who may not completely understand the data sheet and are looking for parts for our projects.

Man you are the best . Well explained . You have patients. All students love you. People like you make this world a better place. Thank you for the info.

Well done, love to see things explained down to circuit level and not just a pin in pin out of a IC.

Excellent discussion...clear, concise and visual. NOTE: I used to play the "pins" all the time.

Brilliant explanation, I am glad I came across this video as I was planning to wire up 8 2N3904 NPN transistors to drive a 4x7 segment display with a 595 shift register. Now I can prevent a headache with this beaut :)

Thank you for all of your videos. I've learned a lot!

Thanks Lewis! I'm just an electronics hobbyist, and had no idea this kind of thing even existed! This is going to make my current project cheaper, easier, and smaller - thank you!

it is the best class of uln2003 i've ever seen. Great video.

What a great little chip. Thanks for bringing it to us.

GREAT TUTORIAL !!! Love ULN2003 !!!! Thanx for Sharing this !!!

Thank you very Much Sir. Your Explanation with Different Examples made it very Helpful

well done video, thanks for the clear, concise explanation!

thanks for making such detailed and skilled videos.

An oldie but a goody -- saved some time on investigating use of this part -- Thankyou

Brilliant explanation! thank you so much!

An excellent tutorial - clean and concise. Before I watched this video, I was having a tug-of-war with my hair :)

Thanks for the videos, helped me to use this transistor array Btw:, I think your tea is ready.

Thanks Lewis! Great tutorial!

Great video as always very well explained Thank you

Спасибо за предоставленные знания!)

Thanks, explained in terms that i can understand Cheers Gilbert

Concisely explained!!!

This was super helpful. Thanks

Now this was very usefull! I mistakently connected the other side of my relays (on side being connected to the ULN2003) to ground. Smarter Every Day ;)

best explanation I've seen

Note while the frame at 20 sec. shows a ULN2803 this video is about the ULN2003. Thanks.

Great explanation!! Thanks

useful Examples especially paralleled outputs for higher power

Fantastic explanation.

thanks, it really helps a lot

Thanks for the video. I made my mind to make my own PCB for stepper motor control with the ESP32 rather than using the external PCB.

Very eye opening. Thanks

Hello Professor, I brd brded a single coil latching relay with 1000ohm into bases of 2n2222a's form arduino. Then I triggered the relay with ULN2003A. The ULN required 7V to power the relay coil and the 2n...'s ran fine on 5V rated coil. Do I need to add R here somewhere? Thanks, Donald

Thanks sir most use full knowledge.

Hi, thanks for the clear and concise description of the ULN2003. In the last example, 3 inputs and outputs were tied to increase the output current. Would it be possible to use three digital outputs from an arduino on pins 1,2 & 3 and combine the outputs of 14, 15 & 16. My hope is to provide three levels of current to an ammeter by turning pin 1 high then pins 1&2 then pins 1,2 & 3. I want to insert a printed face to an analogue ammeter to show three states driven by different input pins on an arduino. I’m just researching possible ways to achieve this.

very cool explanation

Du bist immer top Bruder

i have an opto-coupler to isolate my Micro and 24 V. I cant do common ground as i would loose isolation. shall i apply 10K resoster in series to 24V DC base Vin ?

hi there, I have a question about the relays. where the negative terminal of the 24v go? I mean to power the relays ?thanks a lot

Really clear video

great video thumbs up

Thanks for the info!

Excellent - Thankyou

Fantastic! Thank you.

Thanks a lot ,very well explain

you have got yourself a subscriber

GREAT VIDEO THANK YOU

Thanks for your videos I subscribed

Good explanation

Thank You Sir!!

thanks for sharing

One thing to watch out for is that there is a voltage drop (somewhere around 1 volt) across the darlington's CE junction, so that should be taken into consideration.

Excellent

Excellent♥

good video :D i learn some things :D

excellent

Did you say they invert the input?

Awesome!

when it comes to doing 120v lighting with relays, I've always cut the hot wire and attached that to both sides of relay contacts, leaving the neutral wire uncut. Is that dumb?

Thought I was already subscribed. YT must have hit that toggle switch to ground on this circuit. Seems like Big Tech and the government have a Darlington pair in common with the Transistor movement. That being said. I’m just a resistor in this circuit called Life. Great content. 😅 😀 😂

Excelent video

Thank you

Exelente

what is the stabilizing resistors.Can you explain please?

Hi Lewis, I accidentally burnt my ULN2003L chip on my oven board. I believe this controls my oven door lock (motor) and convex fan motor. How "difficult " is it to unsolder without causing other issues with soldering iron? Also..don't want to damage new chip when soldering. Thanks.

Awesome explanation! I have a question about parallel connection example: will it triple the input current drain from IN1 and IN3 also?

hi sorrie for this stupid quistion i happen to have a 4ch low input active high current darlington sink driver called TD62308APG i just cant figure it out cause a transistor have 3 pins but if you look the inside of this array the transistors have 4 pins and the ic have vcc and ground -5v recomended im fearly new in electronics if maybe you could just explain to me how it works or if its posable thanks for your time

In the last example when pairing in/outputs for higher current (1A), the current per pair in 100% load seems greatly reduced, I wonder if its possible to even drive 1A trough it?

Thanks for a very informative video. Is it possible to use the ULN2003 to make a 12V LED strip fade in and out, by varying the input? (Similar to the Arduino 'fade' example)

I'm actually researching a replace 18 descrete parts with chip now (6 channel).

Im making an led cube with common cathodes, red green being the anodes , do you think I can PWM thought this chip to make the leds dimmer to brighter ?

how does uln2003a differ from uln2003

thank you for the video; what is the difference between the ULN2003A and the ULN2803AN, do they do the same ?

Hello Mr. Lewis, great tutorial. One academic question --- when we parallel the outputs so as to draw larger current for larger loads, during the switching time of Multiple Outputs, would the earlier switched output get eventually damaged? (I am referring to the time gap between (pseudo code) PinOne.makeHigh( ) and PinTwo.makeHigh( )) In case they do not get eventually damaged, what is the thumb rule for such a time -- I mean, "for X microseconds Y times higher currents are tolerated", etc.?

Pin 9 is to be given Vcc. Will it operate if we ground it? 5:15 How is it working if it works?

Is there a way to make these switch positive or can it not be done?

So you can leave pin 9 unconnected? It’s not needed right?

Is there a way to use the uln2003 for have bio directional rotation of a simple DC motor if so please describe.

In the 24 vdc lamp, and 24 vdc relay with 120 vac lamp examples, is pin 8 ground connected to the 5 vdc ground for the microcontroller inputs, or is it connected to 24 vdc ground?

Can ULN2003 be used to drive more than six dc motors? What are the possible options?

Excellent! Thank you for talking about applications. Just one question.... what is a "Pinball Machine"? No but really.. thanks. Videos calculating beta and all that don't help when what I'm looking for is application centric.

In relay circuit . If 9th pin is not connected with the 24v supply what will be the result

شكرا جزيلا أتمنا ان يكون مترجم الى اللغه العربيه

can they switch AC? or only DC? i have to switch many 24V 100mA AC signals....

Can I use ULN2803|Uln2003 to control solenoid valve using PWM|Analog write??? Thanks :)

if I connect one of the base input to 5v of Arduino...then the base current will be 1.3 mA ( (5-1.4)/2700) .. Am i right?

What is the different when I connect pin 9 to ground or to volt? How the array will work?

More pages videos. Using the ULN2003A Transistor Array with Arduino Using the ULN2003A Transistor Array with Arduino www.bristolwatch.com/ele/uln2003a.htm ULN2003A Darlington Transistor Array with Circuit Examples ----- Using the TIP120 & TIP120 Darlington Transistors with Arduino Using the TIP120 & TIP120 Darlington Transistors with Arduino www.bristolwatch.com/ele/tr3.htm Tutorial Using TIP120 and TIP125 Power Darlington Transistors ----- Using Power MOSFETS with Arduino Using Power MOSFETS with Arduino www.bristolwatch.com/ele/tr2.htm N-Channel Power MOSFET Switching Tutorial www.bristolwatch.com/ele/tr1.htm P-Channel Power MOSFET Switch Tutorial ----- Using PNP Bipolar Transistors with Arduino, PIC Using PNP Bipolar Transistors with Arduino, PIC Using NPN Biploar Transistors with Arduino, PIC Using NPN Biploar Transistors with Arduino, PIC www.bristolwatch.com/ele/tr4.htm Understanding Bipolar Transistor Switches ----- How to build a Transistor H-Bridge for Arduino, PIC How to build a Transistor H-Bridge for Arduino, PIC www.bristolwatch.com/ele/tr5.htm Build a High Power Transistor H-Bridge Motor Control www.bristolwatch.com/ele/tr6.htm Driving 2N3055-MJ2955 Power Transistors with Darlington Transistors ----- Build a Power MOSFET H-Bridge for Arduino, PIC Build a Power MOSFET H-Bridge for Arduino, PIC www.bristolwatch.com/ele/h_bridge.htm H-Bridge Motor Control with Power MOSFETS www.bristolwatch.com/ele/tr7.htm More Power MOSFET H-Bridge Circuit Examples

sorrie another thing it says NPN output stages and PNP input stages what does that mean

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There are eight parts per channel but he only explained seven . . .

burned 2 uln2003 when connected 12V lamp with 12V voltage source in the way as is shown on this movie (lamp eg.),

... Except that the photo shows an 18-pin DIP...

Aaah those darlingtons, why not mosfets? Mosfets take less power. UCC2776 - 18V 1.5 A to 3A peak per channel driver

Unipolar stepper motor driver using ULN2003 driving PNP Darlington transistors. Arduino Unipolar Stepper Motor Driver Board with Arduino Code ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HTVYiLOY8SQ.html

You're showing the photo of a ULN2803 (which has 18 pins, not 16) while talking about the ULN2003. Kind of confusing...