I've watched half a dozen diode videos... this is the first that answered my question. My question, which way does current flow thru the diode. Answered here (they way the arrow in the symbol points) and the name of the parts of a diode. Answered her. Anode and Cathode. Thank you
I think I need a Zener diode without schematics for my repair it looks like it says N4 on it .I have ordered a assorted multi pack of Zener diodes how do I select the correct one ?
Repairing a tv with no power. I dont know which component i pulled out of the pcb. But it is a cylindrical black and it does not have on any markings. Or a silver line. Can u help what it is. Upon testing with multimeter it flows current in both directions.
I have 2 faulty 2amp 1000w diodes in my tv power supply, upon replacing, is it a good idea to replace all 4 of them in the rectifier or can I get away with just de-soldering 2 of them? The replacements are the same specs but different brand, should be ok? Thanks.
Hi, Thanks great video I've got a mirco diode reading 158 when tested on my multi-meter...(158 not .158) Can I replace it with a 15V diode...and it's from a car ECU so operates on a 12V system. and I would guess it has a 3V headroom. Thanks
hi and thankyou for your video. i have a cheap multimeter but it does have the reqired symbols. i have tested a brand new diode in fact i tested 3 new diodes but only get a reading of 290 and the reading dosnt move when i switch ends and re test. The diodes i test on the circuit board read 293 and 300 but again 0 when i switch ends. Videos i watch show readings of around 500 is it most likely my multimeter is too cheap and nasty. its a 9v square battery powered thing model dt830d bought from ebay. Thanx for any thoughts im new to this and appreciate any advice
I think of all the diode check videos, you seem to explain it much better. When you mentioned to isolate your diode from board in order to get an accurate reading, I knew I had the right video. Trouble is the diodes I'm testing are underneath a heat sink and it's going to be a little bit testy trying to remove them. I'll get er done though. Every thing leads to something on the power board being bad and when I read the diodes in the circuit I got some strange reading. So, I guess when I pull them out, I'll just replace them anyway. Thanks for the information.
you do not need to remove them to test them conn meter leads if can to test a reading one reverse the leads no redig its good thats all it can do dono worry about resistance in diodes
I'm trying to learn on my own here and I have a question. I have a diode i'm testing out of circuit. The number on the diode is SB560. What should this test at 0.*** ? BTW I have the same tester as you :-)
The only video I've found that actually places the diode symbol next to a diode! Also, people talk about electron flow instead of conventional current flow without clarifying which standard they are using. It confuses me.
It is very hard to find a video explaining how to know the power capacity, what units is used on diodes. Are they measured in watts amps. Almost any video explains that diodes allows current go only in one direction.
Thanks for the video. I'm learning to check diodes on a TV that has failed and I pulled one that I thought was bad, turned out its the Schottky diode which voltage is lower than silicon diode. Diode is good, lol.
Me too Repairing a tv with no power. I dont know which component i pulled out of the pcb. But it is a cylindrical black and it does not have on any markings. Or a silver line. Can u help what it is. Upon testing with multimeter it flows current in both directions.
Rehan Zahid if the markings on the diode are not visible, they have been erased or rubbed off, or whatever.... you merely revert to the standard procedure of testing Diodes the bottom line is this Whether it's telecommunications, Computers, Electronics (FYI, i do all of these things) and we are dealing with something , if we get a shit situation *We Deal with the Situation Logically* hence.. in Telecomms, when you get Dickheads that don't label the MDF book , you need to work with what you have. Diodes are the same but.. *Keep this in mind as well* A Diode without markings either - has Been punished or - Is Very very old which will in turn give you a hint as to the conditions of it now... the bottom line is TEST THEM ANYWAY because a) What are the changes that you are going to get a diode that has (By some act of god) Reversed it's bias, so that the Reverse Bias Voltage = 0.5 V DC and ... on top of that has Unlimited resistance in the opposite direction. hehe Mate, that would be like winning the lotto 10 days in a row one after the other, it'd never happen BUT *EVEN IF IT DID* you could then use this Diode as normal even though it's reversed because it is still behaviing like a normal IN SPEC diode the reality is .... if the markings are missing - You'll test it and.. - either it's good, so Voltage drop in one direction *OH..SORRY.. FYI So you know, When you put your Multimeter in DIODE mode, IT WILL LITERALLY send 2.0 V DC - 2.5 V DC down the probes, so.. when you set your multimeter to Diode Mode, it MEASURES THE VOLT DROP, .... Get it* so... you'll test it and Volt drop in one direction, but OL in the other direction.. this is good and by this you'll determine which is the Cathode and Anode or Volt drop in both directions, so.... you don't give a shit which is which because you'll throw it out, but, if you really want to know wel... if you had one side with a drop of 0.2 V DC and the other with 0.6V DC the side with least resistance is the Cathode 0.6 V DC would be the cathode but again.. who cares or OL in both directions in this case you can't tell which is which because both have infinite resistance in both directions. throw it out HOPE THAT HELPS
pj woo ok, i'll explain it it's simple 1. Albert bain said "diodes, what if your diode has a red line on one side gold on the other side and 2 blace in the middle. Thanks" so. he is talking about a component that has the following markings Red Band / Black Band / Black Band / Gold Band 2. A diode (Usually) has a silver band one one side and the rest of it is black A Diode Does not have coloured Bands A Diode only allows current to flow in one direction (that is it's purpose) here is a picture of a diode www.google.com.au/search?q=diode&source=lnms&tbm=isch&sa=X&ved=0ahUKEwilkYrZj7PXAhXDlpQKHeKhDX0Q_AUICigB&biw=1290&bih=587#imgrc=AF7URewS3p7nlM: now.. 3. here is a picture of a RESISTOR www.google.com.au/search?biw=1290&bih=587&tbm=isch&sa=1&ei=tCQFWp3iI8Gn0AStpYYI&q=resistors&oq=resistors&gs_l=psy-ab.3..0i67k1l2j0l7j0i67k1.38300.39822.0.40096.9.8.0.0.0.0.476.902.4-2.2.0....0...1.1.64.psy-ab..7.2.899....0.lyC2wG7Bp_w#imgrc=FRYfg2fIVJI4zM: NOTICE how the gold is on one side , but there are various colours on the other side on one side of a Resistor you always get either a Gold or Silver Band to indicate it's tolerance. there are other colours, but USUALLY gold and silver is what you see and gold and silver cannot occur at the first part of the resistor also a resistor can pass current in both directions now. go to this link and select 4 Band Resistors and change the values to be Red Band / Black Band / Black Band / Gold Band www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-4-band you will get the reading of 20Ohms Resistance with 5% Tolerance hence my comment the joke was that Albert Bain was being silly and making a joke and acting as if he didn't know the idfference between a Diode and a Resistor it was pretty obvious because as soon as he mentioned Red Band and Gold Band and just threw in 2 black bands for the sake of it , just to make up 4 bands in total it's pretty damn obvious that he was referring to a resistor THAT'S THE JOKE do you understand now Frank didn't understand the joke also he couldn't spell RESISTOR correctly hehe ScorpioX proved to be even more Naive and clearly didn't get the joke either and went onto a subject of Capacitors (Which.... TECHNICALLY, is correct) but not even remotely close to what was being said here i then came along and decided to be cheeky and a smart arse with my comment hence the emphasis *IN BOTH DIRECTIONS* clearly identifying that it can't be a diode (with a few exceptions) but generally speaking, it's common knowledge in electronics that a diode is Polarized. then you came along as far as i'm concerned, You're the only intelligent one among them hehe at least you admitted to not knowing so... that's the joke explained
Your drawing of the way the current flows is wrong. The current jumps the ramp of the diode. And the end of the ramp stops the current from flowing back.
I have a diode in my amp that is burnt looking and no flow either direction and it has some numbers on it but I'll be damned if can find anyone so far here on youtube to just simply tell me where and how to find a replacement diode for god's sake.
Ugh I hate how when you think of current you so intuitively think of electron flow, but the current is the positive flow which is just backwards >:( worst coin flip outcome ever
Its a well done video, but a waste of time. It cannot be used in teaching electrical basics, because the teacher always has to try and convince the frustrated student to ignore the truth and adopt this on going lie. Why do you keep calling Conventional flow the flow of electrons? Just because the arrow on the diode was mistakenly put in the wrong direction when they didn't know any better doesn't mean we have to keep teaching it incorrectly. it's sad to see the arrogance like in partisan politics, that keep insisting this flawed way of teaching is okay. It only keeps the masses ignorantly confused when outdated incorrect theories are not parallel or consistent with the true application. Nice try, but you need to give the students more credit than that. Me and a lot others would love to use your video if corrected. Please leave the dark side Luke. Ha ha Thanks for your time!
One of the best explanations of a diode I've ever seen. Thank you so much for posting this. If you're not teacher, you should be.
By spending this 6 minutes, I completely know what diode is for and how to check it with multimeter. Thanks! Great teacher!
Very clear explanation others I have looked at seem over complicated to the point of becoming unclear' just learning; this helps a lot thanks. Subbed
Good, comprehensive, basic diode explanation. Thanks, Geo.
Very good explanation. Simple and to the point. Thank you.
Thank you so much for your explanation, I am in the process to learn new things and your video is very helpful, thank for taking your time to explain.
Thank you for the clear explanation, i have watched other videos but was very confusing, good job, thanks again
Great job explaining. Just what I needed to know...
Good info its very helpful, thanks very much for posting.
I've watched half a dozen diode videos... this is the first that answered my question. My question, which way does current flow thru the diode. Answered here (they way the arrow in the symbol points) and the name of the parts of a diode. Answered her. Anode and Cathode. Thank you
I think I need a Zener diode without schematics for my repair it looks like it says N4 on it .I have ordered a assorted multi pack of Zener diodes how do I select the correct one ?
Repairing a tv with no power. I dont know which component i pulled out of the pcb. But it is a cylindrical black and it does not have on any markings. Or a silver line. Can u help what it is. Upon testing with multimeter it flows current in both directions.
You hit a home run at the end when you said they should be removed from the board for testing. THAT was my primary concern. Good job!
Only one leg needs be unsoldered to test as it is then free of the circuit. Easier to test with one leg anchored .
Very helpful !!! Great presentation
You are an amazing instructor!!
Thank you for the explicit explanation
how many amp rating is that diode..? And will the measurement be different if you have a higher amperage rating..?
I have 2 faulty 2amp 1000w diodes in my tv power supply, upon replacing, is it a good idea to replace all 4 of them in the rectifier or can I get away with just de-soldering 2 of them? The replacements are the same specs but different brand, should be ok? Thanks.
Hi, Thanks great video
I've got a mirco diode reading 158 when tested on my multi-meter...(158 not .158) Can I replace it with a 15V diode...and it's from a car ECU so operates on a 12V system. and I would guess it has a 3V headroom. Thanks
when i tested a diode the buzzer sounded,so what does it mean???
hi and thankyou for your video. i have a cheap multimeter but it does have the reqired symbols. i have tested a brand new diode in fact i tested 3 new diodes but only get a reading of 290 and the reading dosnt move when i switch ends and re test. The diodes i test on the circuit board read 293 and 300 but again 0 when i switch ends. Videos i watch show readings of around 500 is it most likely my multimeter is too cheap and nasty. its a 9v square battery powered thing model dt830d bought from ebay. Thanx for any thoughts im new to this and appreciate any advice
Thank you this helped me a lot
Great job explaining😎
Your explain is a step by step very good ....
good idea & easy to comprehend
educative:) thank you !
I think of all the diode check videos, you seem to explain it much better. When you mentioned to isolate your diode from board in order to get an accurate reading, I knew I had the right video. Trouble is the diodes I'm testing are underneath a heat sink and it's going to be a little bit testy trying to remove them. I'll get er done though. Every thing leads to something on the power board being bad and when I read the diodes in the circuit I got some strange reading. So, I guess when I pull them out, I'll just replace them anyway. Thanks for the information.
you do not need to remove them to test them conn meter leads if can to test a reading one reverse the leads no redig its good thats all it can do dono worry about resistance in diodes
Can someone tell me what is the forward bias resistance? Thanks,
What is the resistance of the diode, once conducting?
gud information.... thanks guys
Very good show, thanks
Thank you for keeping this simple, because there are idiots like me out there, that needs it to be simple. Great simple tutorial....
Cool video shot, thanks for sharing it with us, well done :)
Ok, testing like this worked for my diode but when I connect the diode to a 7ah sla I get 12 volts both directions. Why?
Thank you Sir terrific keep it up....v informative
Thank you!
What a shame that you are the only one so far to explain such a simple thing clearly to us that are not sure.
Why would you get voltage in both directions in circuit?
Nice one Thanks mate
do you jump a diode to neg to pos ?
I'm trying to learn on my own here and I have a question. I have a diode i'm testing out of circuit. The number on the diode is SB560. What should this test at 0.*** ? BTW I have the same tester as you :-)
Saved me a trip to buy another diode, turned out to be the a/c pressure switch, either bad or low on refrigerant
how would you use it connected across the coil of a relay in a dc setup?
as a rectifier ac to dc
thank you very educative.
The only video I've found that actually places the diode symbol next to a diode! Also, people talk about electron flow instead of conventional current flow without clarifying which standard they are using. It confuses me.
Simple and easy explanation
Tnx so much just don't understand what the numbers on the diodes mean?
It is very hard to find a video explaining how to know the power capacity, what units is used on diodes. Are they measured in watts amps. Almost any video explains that diodes allows current go only in one direction.
Don't you mean resistance ie: ohms. How can you get a voltage reading on your meter when it is set to OHMs?
Its not set to ohms. Its set to the diode test setting
I wish this discussed checking large diodes that have no reading on a regular multimeter.
Hi sir . How about if my diode is connected to a coil am I going to detach my diode from the coil to get an exact voltage reading?
Thanks and Godbless
Best to
Thank you
Thanks brah.
Thank u
How do you get voltage reading from a component not in circuit??
There's no source. Wouldn't it be a resistance reading?
The meter sends the voltage to the diode.
Awesome.🇦🇺
Thanks for the video. I'm learning to check diodes on a TV that has failed and I pulled one that I thought was bad, turned out its the Schottky diode which voltage is lower than silicon diode. Diode is good, lol.
Me too Repairing a tv with no power. I dont know which component i pulled out of the pcb. But it is a cylindrical black and it does not have on any markings. Or a silver line. Can u help what it is. Upon testing with multimeter it flows current in both directions.
@@jemsncrystals that sounds like a bead around a wire , is there clearance around the wire ?
This is all based on conventional theory, correct? So in reality the direction of flow is opposite of what is explained here, correct?
THANKS
Great video enjoyed watching, your testing diode was 1 amp does that mean no more than 1 amp can flow through it
no
Also the white line indicate which way the electons won't flow.
if the polarity of diodes eraised , then how can we recognize the polarity of diodes ??
Rehan Zahid
if the markings on the diode are not visible, they have been erased or rubbed off, or whatever....
you merely revert to the standard procedure of testing Diodes
the bottom line is this
Whether it's telecommunications, Computers, Electronics (FYI, i do all of these things)
and we are dealing with something , if we get a shit situation *We Deal with the Situation Logically*
hence.. in Telecomms, when you get Dickheads that don't label the MDF book , you need to work with what you have.
Diodes are the same
but.. *Keep this in mind as well*
A Diode without markings either
- has Been punished
or
- Is Very very old
which will in turn give you a hint as to the conditions of it
now... the bottom line is TEST THEM ANYWAY
because
a) What are the changes that you are going to get a diode that has (By some act of god) Reversed it's bias, so that the Reverse Bias Voltage = 0.5 V DC and ... on top of that has Unlimited resistance in the opposite direction.
hehe
Mate, that would be like winning the lotto 10 days in a row one after the other, it'd never happen
BUT *EVEN IF IT DID* you could then use this Diode as normal even though it's reversed because
it is still behaviing like a normal IN SPEC diode
the reality is ....
if the markings are missing
- You'll test it and..
- either it's good, so Voltage drop in one direction
*OH..SORRY.. FYI So you know, When you put your Multimeter in DIODE mode, IT WILL LITERALLY send 2.0 V DC - 2.5 V DC down the probes,
so.. when you set your multimeter to Diode Mode, it MEASURES THE VOLT DROP, .... Get it*
so... you'll test it and
Volt drop in one direction, but OL in the other direction.. this is good
and by this you'll determine which is the Cathode and Anode
or
Volt drop in both directions, so.... you don't give a shit which is which because you'll throw it out,
but, if you really want to know
wel... if you had one side with a drop of 0.2 V DC and the other with 0.6V DC the side with least resistance is the Cathode 0.6 V DC would be the cathode
but again.. who cares
or
OL in both directions
in this case you can't tell which is which because both have infinite resistance in both directions.
throw it out
HOPE THAT HELPS
diodes, what if your diode has a red line on one side gold on the other side and 2 blace in the middle. Thanks
resisters have colored bands, maybe you are looking at a resister
HEHE
Well, i guess you'll be looking for 20 Ohms resistance in both directions then... with LET'S NOT FORGET 5% tolerance LMFAO
I don't know enuf about this stuff to get your joke really, but it still struck me funny. Thanks for the laugh (MFAO).
pj woo
ok, i'll explain it
it's simple
1. Albert bain said
"diodes, what if your diode has a red line on one side gold on the other side and 2 blace in the middle. Thanks"
so. he is talking about a component that has the following markings
Red Band / Black Band / Black Band / Gold Band
2. A diode (Usually) has a silver band one one side and the rest of it is black
A Diode Does not have coloured Bands
A Diode only allows current to flow in one direction (that is it's purpose)
here is a picture of a diode
www.google.com.au/search?q=diode&source=lnms&tbm=isch&sa=X&ved=0ahUKEwilkYrZj7PXAhXDlpQKHeKhDX0Q_AUICigB&biw=1290&bih=587#imgrc=AF7URewS3p7nlM:
now..
3. here is a picture of a RESISTOR
www.google.com.au/search?biw=1290&bih=587&tbm=isch&sa=1&ei=tCQFWp3iI8Gn0AStpYYI&q=resistors&oq=resistors&gs_l=psy-ab.3..0i67k1l2j0l7j0i67k1.38300.39822.0.40096.9.8.0.0.0.0.476.902.4-2.2.0....0...1.1.64.psy-ab..7.2.899....0.lyC2wG7Bp_w#imgrc=FRYfg2fIVJI4zM:
NOTICE how the gold is on one side , but there are various colours on the other side
on one side of a Resistor you always get either a Gold or Silver Band to indicate it's tolerance.
there are other colours, but USUALLY gold and silver is what you see
and gold and silver cannot occur at the first part of the resistor
also a resistor can pass current in both directions
now.
go to this link
and select 4 Band Resistors
and change the values to be
Red Band / Black Band / Black Band / Gold Band
www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-4-band
you will get the reading of 20Ohms Resistance with 5% Tolerance
hence my comment
the joke was that Albert Bain was being silly and making a joke and acting as if he didn't know the idfference
between a Diode and a Resistor
it was pretty obvious because as soon as he mentioned Red Band and Gold Band and
just threw in 2 black bands for the sake of it , just to make up 4 bands in total
it's pretty damn obvious that he was referring to a resistor
THAT'S THE JOKE
do you understand now
Frank didn't understand the joke
also he couldn't spell RESISTOR correctly hehe
ScorpioX proved to be even more Naive and clearly didn't get the joke either
and went onto a subject of Capacitors (Which.... TECHNICALLY, is correct) but not even remotely close to what was being said here
i then came along and decided to be cheeky and a smart arse with my comment
hence the emphasis *IN BOTH DIRECTIONS* clearly identifying that it can't be a diode (with a few exceptions) but generally speaking, it's common knowledge in electronics that a diode is Polarized.
then you came along
as far as i'm concerned, You're the only intelligent one among them hehe
at least you admitted to not knowing
so...
that's the joke explained
We use double diodes all the time as they allow our low frquency ac signal to pass while blocking the dc power we use to detonate explosives.
Thanks, yes it is a resister . thanks
Resistor
Your drawing is backwards from other video's and text books. are you sure that's the direction of current?
My old memories when coming with new as our T cell
The focus is making my eyes feel dodge
How can i be your student sir?
can a diode charge a battery ?
+C J , no diodes can charge a battery
HowToWith GEO . base on my experience diodes can charge battery if your using a solar pannel.
😇
In my opinion, all looped currents should have a diode.
5 : 55 i think i was wrong about faults till i see this note
Your drawing of the way the current flows is wrong. The current jumps the ramp of the diode. And the end of the ramp stops the current from flowing back.
This video is wrong. On the symbol, The arrow points to a wall Indicating electrons can not flow in that direction.
I have a diode in my amp that is burnt looking and no flow either direction and it has some numbers on it but I'll be damned if can find anyone so far here on youtube to just simply tell me where and how to find a replacement diode for god's sake.
Ugh I hate how when you think of current you so intuitively think of electron flow, but the current is the positive flow which is just backwards >:( worst coin flip outcome ever
Its a well done video, but a waste of time. It cannot be used in teaching electrical basics, because the teacher always has to try and convince the frustrated student to ignore the truth and adopt this on going lie. Why do you keep calling Conventional flow the flow of electrons? Just because the arrow on the diode was mistakenly put in the wrong direction when they didn't know any better doesn't mean we have to keep teaching it incorrectly.
it's sad to see the arrogance like in partisan politics, that keep insisting this flawed way of teaching is okay. It only keeps the masses ignorantly confused when outdated incorrect theories are not parallel or consistent with the true application. Nice try, but you need to give the students more credit than that.
Me and a lot others would love to use your video if corrected. Please leave the dark side Luke. Ha ha Thanks for your time!
Useful and helpful... but are you aware that you are using a tone like you are speaking to third-graders?
I thought his voice and tone were very pleasing, first rate in fact. I thoroughly enjoyed the video in every way.