LED Dimmer Circuit - Brightness Control Using a Potentiometer

[@nomad943]

I have looked everywhere for an article or video to explain exactly what you just did. Thank you! Thank you!

[@NguyenHaNhutLong]

Haha I admire you so badly! You are like a live wikipedia sir! All your lectures are better than my professors teaching at school. I just wonder how do you learn and understand these materials so quickly?

[@etherealstars5766]

I love this Channel so much, I almost accidentally typed The Divine Chemistry Tutor in the search bar XD

[@lawrencesears3580]

OOPS! Your lectures are terrific, but in this case you made an error: Your analysis is only valid if the bottom leg of the potentiometer is NOT connected to battery negative. Also, it would help if you visually showed the position of the slider. You do a wonderful job!

[@caneisius]

The way he pronounces "potentiometer" drives me nuts... Great content! But every time he says "potentiometer" I die a little on the inside.

[@TheFakeyCakeMaker]

Agree.

[@francoisloriot2674]

this is not an english tutorial man!!

[@awm6368]

Actually after hearing his pronunciation, it should be the accepted pronunciation because it spells out exactly what the compontent operates on - potential power.

[@limuelp.4564]

Thanks its very helpful to us EIM students

[@samsue1224]

Your previous Potentiometer video has the current limiting set up with one leg of the potentiometer not connected, yet here you have all 3. Which one is correct ?

[@winterender8663]

Hello. I LOVE PHYSICS

[@successthruknowledge]

So the current that he refers to is the current entering the diode, correct? Why does he not need to account for the voltage of the second resistor when determining the voltage of the equation? Is it negligible? or what?

[@fireofenergy]

I didn't know there was such a thing as a 2v green. Is that just a mistake or is there one that is yellow (red, orange and yellow is 2v) but that looks kinda greenish? Thanks.

[@hakimzah]

Hi how do you determine the value of Rs needed?

[@jeanjean9343]

Po ten she om a ter Potentiometer. I'm going nuts here trying to fix an LED Lantern. The light flickers, due to a dirty or poorly designed potentiometer. I replaced it, nice pot., with a switch, wired through the switch, through the end of the pot., and the wipe goes to the LED. Works great, but still flickers. Ugh. The pot. is rated 500 milliwatts, I'm drawing 320, so I'm OK there, in dimmer levels, only 100 milliwatts. Why is it still flickering with a new pot. Are there better pots. with switches built in, should I use a wirewound pot. I need 1K end to end reststance, i.e. a 1 k pot. But one that works without flickering.

[@antonmymrikov5338]

What about situation if I have power source with fixed voltage for example 3.3V and LED has the same voltage. How to regulate current? Thanks.

[@borstv4519]

woah thanks ... this is so helpful

[@sietefuegosconcandela8362]

Please show me how to connect how to connect the. components of a toy motor a light or some thing else and when do I use BK 10 BK 50?

[@ainttakenanyshit]

This method to control LED brightness is not the optimal method, but, for the very low current that an LED draws, it works OK. To control a higher current device, I.E. an LED string of lights which draw somewhere between .5 amps to 1 to 2 amps, OR a small DC motor, a PWM - Pulse Width Modulated controller is required. These PWM controllers can control the very light currents of LED's AND that of higher current devices of long LED strings or DC motors.... I'll be using a 20K ohm pot in series with a 330 ohm resistor to vary the brightness of my small crosshair LED to mount to my laser cutter to show my starting position. Remember, the wattage rating of most "hobby pots" are only .25 to .50 watts and to only use them for very light current loads....

[@anikpathan7094]

What if LED is 30watt and supply is 20v. so can we use same circuit

[@winterender8663]

Can u teach differentiation tomorrow

[@stellaroberts6913]

👍

[@TheFakeyCakeMaker]

Would have appreciated seeing how to actually make this.

[@TheUrborg]

You should use a pwm signal to dimm a led.

[@ulissesbarraza9800]

I recently used pwm for dimming on LED strips. But when I move my eyes, my peripheral vision picks up trailing effects from the flickering.

[@wannabemadsci]

puh · ten · shee · aa · muh · tr

[@ziniethan]

potenchometer :|

[@konkcs4]

I think there's a small mistake here, the first part of pot is in series with the LED but you forgot that the rest of pot is in parallel with LED, think about it for a second.

[@kerenhappuch5605]

Hey sir, keep up with the good work that you've been doing we appreciate it. I really need to have a word with you! mind sharing your email with me please.