Honestly, your videos are some of the best out there for explaining electronics, I look forward to some more advanced circuits. This channel will grow in no time, keep up the good work.
Brilliant video series. Thank you for making these. I am 45 and new to electronics. Your videos deliver the facts and the equations in the simplest of terms that even I can understand. Cheers buddy!
@@bradley9856 Nope. Just a hobby for me since I earned my Ham Radio license. I am only just getting to grips with Arduino circuits now, but still having fun with analogue circuits too. Electronics is a fun hobby for everyone of all ages and abilities, it is great to learn something and have fun, even though I am disabled. I only wish I wanted to learn as a youngster as I do now, but time marches on. Been a long time since this channel made a video, I do hope they are okay. Stay safe, god bless.
All your videos are quite interesting and understandable. I am in class 11 and have seen many of your videos and now I am very much comfortable with electronics.
By reducing your zener diode from 5 to 3.3 volts you are automatically already increasing the current through that 330 ohm resister to (12 - 3.3)/330 = 27 mA.
You can calcuate max current through zener diode in this case 0.5W/5V = 100mA but how do you determine MIN current needed for a zener diode?. Thanks for the video.
N00b question. Why would you put the LED in parallel with the zener diode as apposed to in series? I would imagine the 'safe/protected area' to be snuzzled in the middle between the resistor and the diode, where as spanning the diode would create an unregulated path? i.e. like a firewall..
Remember that voltage is measured between two points. The whole idea of this circuit is to create a 'safe/protected' area of voltage between two points. Using the zener diode creates the needed voltage across it to operate the LED. There is no voltage between the resistor and the zener diode. Putting the LED in series with the resistor and the zener diode would be adding another 3V drop which would cause the voltage across the resistor to have around 6V across it, which would cause the current to change. So the whole point is to be able to get the right voltage across the LED and then modify the circuit so that it can supply the right amount of current when under load by the LED. Great question :)
Really well explained, thank you! This and the Part 1 video about zener diodes have finally made me understand what's actually going on. Please keep up the good work! Liked & subscribed.
Really helpful video. I have a zener diode with unknown Zener voltage value. I am trying to figure out it's actual zener voltage by using a variable resistor connected in series with the zener diode, across a power supply of 5V. As I adjust the variable resistor, the voltage across the Zener diode changes too. The problem is that the change in current causes a significant change in voltage across the Zener and the voltage just continues to change rather than settling at it's fixed zener voltage. Having watched this video, it seems that that isn't the case, as the zener voltage changes not so much when you adjust the voltage of the power supply which results in change in current. So what am I doing wrong. Might it be the Zener diode itself?
I can see that the LED is connected across the zener and will draw its own required current to light up, but how much current will it actually draw? I believe the max current for a 5mm LEDs is about 20 mA. Also, how do you determine the minimum current needed by the zener to maintain voltage regulation? These points are not clear on an otherwise excellent video.
would that zener diode working a design modle rocket ignighter i am building the launch controll it does not take much power from a 9v battery to fire the ingigniters
i tried to do a simple PSU for a subwoofer preamplifier, the preamplifier worked flawlessly BUT i didn't get to work the PSU correctly naw i know that the output resistor might be to large so the voltage across the zeners are 0.6V
An extraordinary Video and crystal clear. well, I have a doubt. I am using a BZX84C6V2L Zener diode and as per the spec sheet Zener voltage range is 5.8 to 6.6v. but I am confused with Zener current(5mA) vs reverse current(3mA). Moreover, Zener voltage vs reverse voltage(4v). It would be highly appreciated if you please explain the differences between the above attributes.
in what part we said that we want to limit the current to 20 mA? I calculated it and i have different maximum current for not exceeding the maximum power. 1 = 6,9 * I for resistor and 0,5 = 5,1 * I for diode. For resistor maximum current must be 140 mA and for diode it must be 100 mA. Because 140 mA is too much for diode, we must choose maximum current of 100 mA. Now we can calculate the resistance of a resistor... R = U / I R = 6,9 / 0,1 = 69 ohms. But because its maximum allowable value, we can double the resistance and it will not burn. Anyway its a good video but this part is confusing for me.
Wait a minute. You calculated 0.9A through the resistor while dropping 5.1V across the zener diode. When you changed the zener to 3.3 for the LED you are now dropping 2V more across the resistor which will now exceed the Wattage of the resistor (and diode). If you change the zener, you need to change the resistor, too, just to keep the current the same. Correct?
I also noticed that something was wrong when replacing the zenner. To get the same 20mA (not 0.9A as Rich states), you should have replaced the resistor from aprox 350 to 450 ohms.
Rich Booth 0.9A assuming you have a 10ohm resistor, he actually had a 330ohm, 6.9v (the voltage across the resistor)/330ohm = 0.020 amps or 20mA. To get 40mA, just do the math, I = V/R, you want R, so you solve for it and you get R = V / I that is R = 8.7v (he changed his diode to 3.3) / 0.040, which equals 217ohms, he used a close value resistor and got something close to 40mA
Good day sir I'm new here watching your awesome vedio can I asking some question hmm how about 19v sir what resistor I'm gonna use and what zener diode. I want to break down into 12v help me sir thanks.
Your videos are the best I've seen yet, but I'm a little confused on this subject. If you can power an LED off of any voltage with just a resistor, why are you adding the zener diode? Like I know well that you can just power that LED off of the 12v supply using a single resistor, so the point of a zener diode seems useless in that situation
That is why a current source should be used to power a led. This ensures a 20ma current through the led, as long as the input voltage is above the leds forward voltage. When a fixed voltage is available, a simple series resistor is fine.
I don't think so, because if the supplied voltage is less than the zener breakdown voltage, then the entire voltage will be dropped across the zener itself, and there would be no current flow in the circuit at all, neither any voltage drop across the resistor.
Very good. You explained for me thee Holly Grail of building circuits capable of LED powering for my truck and how to figure it out. However,,, I have claber for a brain anymore, 63 year old, I am going to have to keep the video from here to my death.
I'm a bit confused. When you added the LED, didn't you place that in parallel with the zener? Doesn't that mean that it's only the resister regulating the voltage/current through that LED? How's the zener regulating the voltage to this load?
Good stuff. Maybe slow down. The issue of multiple current paths through a circuit is massively confusing to people new to the art. A totally separate video on that concept should preceded this one.
ack!.. what about the 14 volts.. ohm's law uses output voltage instead of input voltage? Geez different names for the same thing different interpretations of laws I am to old for this stuff.
Can you please help me then ... i want to make a circuit Where i have a 12-15V input 75amp And i want to output 7-9V 5amp 30W Which will power a bulb that is rated 12V 21W 1.7-2 amps I want to power the bulb continually as 7-9 V And sometimes pulse a 12v across that bulb to make it brighter without damaging the circuit while it is getting 12v pulses All my social medias are omeeDoski if anyone could help please i will appreciate it alot
Excellent 👍 tutorial. Thanks I want to make a powerful mobile phone charger. I need 5.4 volts fixed and 20amps using zener diod. Can you please tell me how it is possible?
This is bullshit. A Led conected in paralel with zener will bypass the zener. The voltage across led is the remaining of resistor voltage drop. Also the current is equal in circuit so 20 mA will be good for led. Come on man....
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
Honestly, your videos are some of the best out there for explaining electronics, I look forward to some more advanced circuits. This channel will grow in no time, keep up the good work.
Brilliant video series. Thank you for making these. I am 45 and new to electronics. Your videos deliver the facts and the equations in the simplest of terms that even I can understand. Cheers buddy!
You're 48, just thought I'd remind you of that.
You're welcome
@@bradley9856 Lol, cheers mate.
@@KennethNicholson1972 But the real question is, are you pro at electronics?
@@bradley9856 Nope. Just a hobby for me since I earned my Ham Radio license. I am only just getting to grips with Arduino circuits now, but still having fun with analogue circuits too. Electronics is a fun hobby for everyone of all ages and abilities, it is great to learn something and have fun, even though I am disabled. I only wish I wanted to learn as a youngster as I do now, but time marches on. Been a long time since this channel made a video, I do hope they are okay. Stay safe, god bless.
@@KennethNicholson1972 That's good to hear!
keep posting more videos, congrats on 10,000 subs
Well explained,within only 10 minutes i have learned lot about Zener diode.Thanks a lot.
All your videos are quite interesting and understandable. I am in class 11 and have seen many of your videos and now I am very much comfortable with electronics.
This totally cleared all of my misconceptions. Thank you!
I’m beginning to write a simple book “Out the Gate to the Circuit”.
A hands on guide for beginners
Great 👍 Analysis.
Thanks for your tutorial. Easy to learn by your step by step explainations and descriptions! (Sorry for my english...)
By reducing your zener diode from 5 to 3.3 volts you are automatically already increasing the current through that 330 ohm resister to (12 - 3.3)/330 = 27 mA.
thank you for these videos am watching you and inviting all my friends to your channel
peace from iraq 🇮🇶
surely the LED has to be in series with the Zener? because it looks like it's in parallel, and just bypassing the diode
Thank you. As a newbie, this video cleared up some confusion for me. Great job!
You can calcuate max current through zener diode in this case 0.5W/5V = 100mA but how do you determine MIN current needed for a zener diode?. Thanks for the video.
"The resistor would be on fire, and that is not good" Perfect!
N00b question.
Why would you put the LED in parallel with the zener diode as apposed to in series?
I would imagine the 'safe/protected area' to be snuzzled in the middle between the resistor and the diode, where as spanning the diode would create an unregulated path?
i.e. like a firewall..
Remember that voltage is measured between two points. The whole idea of this circuit is to create a 'safe/protected' area of voltage between two points. Using the zener diode creates the needed voltage across it to operate the LED. There is no voltage between the resistor and the zener diode. Putting the LED in series with the resistor and the zener diode would be adding another 3V drop which would cause the voltage across the resistor to have around 6V across it, which would cause the current to change. So the whole point is to be able to get the right voltage across the LED and then modify the circuit so that it can supply the right amount of current when under load by the LED. Great question :)
vince rodriguez nice explanation. Thanks
Excellent tutorial on the Zener. Best on RUclips. Thanks much.
wow very helpful...
keep it up..
your explanation is clearer than any videos that i have watched...
thank you very much :)
Really well explained, thank you! This and the Part 1 video about zener diodes have finally made me understand what's actually going on. Please keep up the good work! Liked & subscribed.
I tinkered with simple electronics while in school... Interest re-awakened...
Really helpful video. I have a zener diode with unknown Zener voltage value. I am trying to figure out it's actual zener voltage by using a variable resistor connected in series with the zener diode, across a power supply of 5V. As I adjust the variable resistor, the voltage across the Zener diode changes too. The problem is that the change in current causes a significant change in voltage across the Zener and the voltage just continues to change rather than settling at it's fixed zener voltage. Having watched this video, it seems that that isn't the case, as the zener voltage changes not so much when you adjust the voltage of the power supply which results in change in current. So what am I doing wrong. Might it be the Zener diode itself?
Thank you for this great information. You've been such a hub to me. Thanks. for sharing.
Excellent sir, clear and concise! Thank you...
Just what I needed. Keep up the awesome videos! I'm finally getting all of this stuff!
Simple and Perfect way of explanation...
Awesome, its really helpful to understand the topic by experiments! Thanks a lot!
I can see that the LED is connected across the zener and will draw its own required current to light up, but how much current will it actually draw? I believe the max current for a 5mm LEDs is about 20 mA. Also, how do you determine the minimum current needed by the zener to maintain voltage regulation? These points are not clear on an otherwise excellent video.
Can a 5V or a 6.3V zener diode be used with 12V input supply to trigger a 5V relay?
Silly question, but why is the LED put in parallel with the Zener diode instead of series? Does that matter?
Great demos and explanation for the electronically challenged like myself! Liked and subscribed!
would that zener diode working a design modle rocket ignighter i am building the launch controll it does not take much power from a 9v battery to fire the ingigniters
Such an amazing video.
Pretty good explaination, i wonder if it'd handle small voltage spikes up to 40 volts without passing them on to the IC i was hoping to run.
i tried to do a simple PSU for a subwoofer preamplifier, the preamplifier worked flawlessly BUT i didn't get to work the PSU correctly naw i know that the output resistor might be to large so the voltage across the zeners are 0.6V
An extraordinary Video and crystal clear. well, I have a doubt.
I am using a BZX84C6V2L Zener diode and as per the spec sheet Zener voltage range is 5.8 to 6.6v. but I am confused with Zener current(5mA) vs reverse current(3mA). Moreover, Zener voltage vs reverse voltage(4v).
It would be highly appreciated if you please explain the differences between the above attributes.
Excellent information, thanks for sharing.
Will I lose more energy if I just connect a series resistor to the LED?
Good video, one question though, looking at your logo I can't understand why is the(NPN) transistor base is connected through a switch to the ground?
@Bloodred Pyrate I do not remember my comment, I am not sure what I saw, but any way I am not a native speaker.
Learned a lot from your channel. Thanx….
you are one of the best, keep doing video please, am inviting everyone to your channel.
Thank You Brad. I very much intend to keep going :)
Thanks for such informative great videos .
How well would a zener do in regulating the charging of a Capacitor?
( in the reverse bias position)
in what part we said that we want to limit the current to 20 mA? I calculated it and i have different maximum current for not exceeding the maximum power. 1 = 6,9 * I for resistor and 0,5 = 5,1 * I for diode. For resistor maximum current must be 140 mA and for diode it must be 100 mA. Because 140 mA is too much for diode, we must choose maximum current of 100 mA. Now we can calculate the resistance of a resistor...
R = U / I
R = 6,9 / 0,1 = 69 ohms. But because its maximum allowable value, we can double the resistance and it will not burn.
Anyway its a good video but this part is confusing for me.
Cannot see multimeter reading ?
So, where have you gone to?
Thank u. Fully satisfied
wow brilliant.....best video on zener diode :)))) cheers mate
Wait a minute. You calculated 0.9A through the resistor while dropping 5.1V across the zener diode. When you changed the zener to 3.3 for the LED you are now dropping 2V more across the resistor which will now exceed the Wattage of the resistor (and diode). If you change the zener, you need to change the resistor, too, just to keep the current the same. Correct?
I also noticed that something was wrong when replacing the zenner. To get the same 20mA (not 0.9A as Rich states), you should have replaced the resistor from aprox 350 to 450 ohms.
Rich Booth 0.9A assuming you have a 10ohm resistor, he actually had a 330ohm, 6.9v (the voltage across the resistor)/330ohm = 0.020 amps or 20mA. To get 40mA, just do the math, I = V/R, you want R, so you solve for it and you get R = V / I that is R = 8.7v (he changed his diode to 3.3) / 0.040, which equals 217ohms, he used a close value resistor and got something close to 40mA
Good day sir I'm new here watching your awesome vedio can I asking some question hmm how about 19v sir what resistor I'm gonna use and what zener diode. I want to break down into 12v help me sir thanks.
Your videos are the best I've seen yet, but I'm a little confused on this subject. If you can power an LED off of any voltage with just a resistor, why are you adding the zener diode? Like I know well that you can just power that LED off of the 12v supply using a single resistor, so the point of a zener diode seems useless in that situation
That is why a current source should be used to power a led. This ensures a 20ma current through the led, as long as the input voltage is above the leds forward voltage. When a fixed voltage is available, a simple series resistor is fine.
Will this work if the voltage by the power supply is lower than the rated voltage of the zener diode?
I don't think so, because if the supplied voltage is less than the zener breakdown voltage, then the entire voltage will be dropped across the zener itself, and there would be no current flow in the circuit at all, neither any voltage drop across the resistor.
Very well explained!
you are the best man
Great Job!
Very good. You explained for me thee Holly Grail of building circuits capable of LED powering for my truck and how to figure it out.
However,,, I have claber for a brain anymore, 63 year old, I am going to have to keep the video from here to my death.
Very good teaching
I'm a bit confused. When you added the LED, didn't you place that in parallel with the zener? Doesn't that mean that it's only the resister regulating the voltage/current through that LED? How's the zener regulating the voltage to this load?
أحسنت. بارك الله فيك.
Thanks very much for the great video's.
Thanks. Obrigado. Grazzi. Dankeschön.
thanks for the videos!
vewry well explained thanks a lot
Thanks man ^^ Very helpful
thanks for the vedio very clear make more vedios
what lovely diode omg epic
awesome bro...
How in the world 14 minus 1.5v is 9volts?
liked
Luv u so much
good thank you
half of 330 ohms resistor is less than 200 ohms which you used.
Good stuff. Maybe slow down. The issue of multiple current paths through a circuit is massively confusing to people new to the art.
A totally separate video on that concept should preceded this one.
8:48 whats up with that hand?
ack!.. what about the 14 volts.. ohm's law uses output voltage instead of input voltage? Geez different names for the same thing different interpretations of laws I am to old for this stuff.
çok güzel.
cool
Can you please help me then ... i want to make a circuit
Where i have a 12-15V input 75amp
And i want to output 7-9V 5amp 30W
Which will power a bulb that is rated
12V 21W 1.7-2 amps
I want to power the bulb continually as 7-9 V
And sometimes pulse a 12v across that bulb to make it brighter without damaging the circuit while it is getting 12v pulses
All my social medias are omeeDoski if anyone could help please i will appreciate it alot
Excellent 👍 tutorial. Thanks
I want to make a powerful mobile phone charger. I need 5.4 volts fixed and 20amps using zener diod. Can you please tell me how it is possible?
😁
This is bullshit. A Led conected in paralel with zener will bypass the zener. The voltage across led is the remaining of resistor voltage drop. Also the current is equal in circuit so 20 mA will be good for led. Come on man....
Circuits giving you a nigtmares? scout androidcircuitsolver on google
You might want to clip your nails before filming a video... 😉😉
i can't trust people who don't ever pause to clear their throat or close their mouth to rehydrate