Wow this is a great explanation using transistors! I've been using the L293D IC for a while now and have been very curious of the magic that goes on in there lol. Thank you for enlightening us sir!!!
Glad to hear you got it to work! But that is very strange, it should definitely be NPN on low side, and PNP on high side, is it possible they got mixed up in your kit? Have you tried verifying the part by the markings on the device itself?
Doubt!!!! The pnp transistor would be of only if veb has voltage greater then 0.7 so the applied voltage should be vin+0.7 to make transistor switch off ryt?
Yes you are partly right and I think he missed that out in the explanation. In PNP transistors, as long as you have VB= VE -0.7 , the transistor will switch ON and vice versa
This was brilliant- If you were a super hero you'd be MR FANTASTIC- come and teach us in Oxford Brookes, please please please- we'll buy you lots of tea and cake...
wouldnt there be a small time when one transistor is turning off and the other is turning on, where both let through a small current, which shorts the circuit?
if both A and B are in the same state, does the motor resist turning if you try to rotate the axle it with your fingers? That is, the axle is being held in place? Or is it like no power was applied at all, the motor turns?
Could you please help me answer the question. Why does a pnp structure transistor open at a low signal, and npn is closed, and vice versa, what is the reason for this?
I have a hub motor for my skateboard that the h bridge computer always breaks because I add mods that short it out sometimes or it gets wet in the rain, so I made a 4 relay computer that just switches its positive and negative terminals to the battery to let it go forward but its really slow and jittery, this motor only goes forward if you keep switching the battery terminals which I guess that's what a h bridge does but my versions just 4 relays switching at 400ms and a Arduino to switch them. is that what your h bridge does, just switch terminals? this motor is dumb I'm going to just get a motor that you can just connect to a battery and it will go.
Will it work if i reverse the npn n pnp transisotr. I mean what will happen if i place npn instead of pnp and pnp instead of npn. Help me i am in trouble.
Problem is PNP transistors are more expensive and lot less available than NPN, so many H bridge circuits use all 4 the same NPN transistors, this is where it starts to get more complicated, you cant join their bases together, so could you do an H bridge circuit using all 4 NPN transistors
Yaser Ibrahim, as for the demo (I am guessing that is what you are referring to) I believe that I used a pair of 2N3904 NPNs, and a pair if 2N3906 PNPs, they are small signal BJTs that I happened to have around, not ideal for doing what I did, but they were sufficient to illustrate the demo. I also can't remember if I mentioned it in the video, but this circuit is put nicely into a single IC (well there are many other ICs which also do this) which is the L293D H Bridge
No offense, but that was a pointless example. The circuit required you to manually switch wires from v+ to v-. You could skip the transistors and do that with just the wires. I understand what you were trying to teach but it would have been more useful if you connected it to two switches or and ldr so that this circuit could actually be useful and the explanation wouldn't appear pointless.
this is the most useful video ever... i spent 2 days looking for a simple h bridge circuit
Best explanation I've seen to-date.
Wow this is a great explanation using transistors! I've been using the L293D IC for a while now and have been very curious of the magic that goes on in there lol. Thank you for enlightening us sir!!!
m.ruclips.net/video/DUVPXXWZvo4/видео.html
😂 finally someone who can explain in detail the difference between PNP and NPN!👍🏼
I spent a full half hour trying to draw out a circuit to accomplish the same function, only to discover that H-bridges exist.
I also
m.ruclips.net/video/DUVPXXWZvo4/видео.html
lol
Thank you, your video was absolutely interesting and useful, greetings from the third world, Colombia.
dude.....thanks for explaining this shit in english.....its been years...decades of confusion....all completely solidified and no math
thank you
Perfectly explained!
Absolutely fantastic job explaining this, thanks wonders
Good explanation and thanks for showing us that the theory actually is true.
Awesome Video. Super great explanation, clear and to the point. This is really cool to see how it works.
you just lite a bulb in my head.. thanks!!
Amazing effective trick!Very simple.Great expanation!Thanks!
Thank you sir! This video was phenomenal!
Bessttttt....... explanation.... continue to upload.💞
Thanks very much. Good demo for the experimenter.
Word of advice add a set of diodes to the bjts to protect against inductive spikes.
Thank you! I built this with an Arduino kit and it worked BUT only when I put the two NPN transistors at the top and the PNP's at the bottom.
Glad to hear you got it to work! But that is very strange, it should definitely be NPN on low side, and PNP on high side, is it possible they got mixed up in your kit? Have you tried verifying the part by the markings on the device itself?
Yes, I checked them multiple times.. At the bottom I used the BC32725 (PNP) transistor and at the top BCBC337-25 (NPN)
Check the positive and negative of motor
Well explained thx
Doubt!!!! The pnp transistor would be of only if veb has voltage greater then 0.7 so the applied voltage should be vin+0.7 to make transistor switch off ryt?
Yes you are partly right and I think he missed that out in the explanation. In PNP transistors, as long as you have VB= VE -0.7 , the transistor will switch ON and vice versa
Excellent explain, thank you!
AWsum video tutorial bro....thanks
m.ruclips.net/video/DUVPXXWZvo4/видео.html
Very well explained. Thanks a lot!
No Diodes or capacitors added into the h bridge for magnetic energy protection?
This was brilliant- If you were a super hero you'd be MR FANTASTIC- come and teach us in Oxford Brookes, please please please- we'll buy you lots of tea and cake...
loved the explanation...worked for me
wouldnt there be a small time when one transistor is turning off and the other is turning on, where both let through a small current, which shorts the circuit?
i have to make a square wave inverter but it should be able to drive around 400 watts of load, What amendments i have to make?
To control speed you need IC chip but even then would a motor like this be able to be changed to a very low speed like 50 rpm
Very nicely explained.
Thank you!
if both A and B are in the same state, does the motor resist turning if you try to rotate the axle it with your fingers? That is, the axle is being held in place? Or is it like no power was applied at all, the motor turns?
Very well explained 👌🏻
congrats man! really really helpful video
Nicely explained!
Good Video! Thanks for this Tutorial!
Great explanation.
You should publish more of your content 👍🏻👍🏻
I did a connection like this, but when I turn on the power, the transistors started to smoke.
Excellent!
Could you please help me answer the question. Why does a pnp structure transistor open at a low signal, and npn is closed, and vice versa, what is the reason for this?
i think the path of the bridge will change and mess up your circuit and maybe blow something up like KABOOOOOM!!!!!!!!!!!!!!!
Hello,can you help me with some answers about an schematic h-bridge?
I have a hub motor for my skateboard that the h bridge computer always breaks because I add mods that short it out sometimes or it gets wet in the rain, so I made a 4 relay computer that just switches its positive and negative terminals to the battery to let it go forward but its really slow and jittery, this motor only goes forward if you keep switching the battery terminals which I guess that's what a h bridge does but my versions just 4 relays switching at 400ms and a Arduino to switch them. is that what your h bridge does, just switch terminals? this motor is dumb I'm going to just get a motor that you can just connect to a battery and it will go.
I only have same type transistors. Can I make H bridge using 4 of the same type?
thanks... keep update... subscribed
How to make that automatically change with pwm.
frickin badass. thanks
Really helpful cheers man!
I understand the operation. But why ? I mean if you can switch polarity. Why use the transistors at all. .?
pls do you have automatic sequential polarity switching for motor
Whoa that was great! Thanks allot!
Amazing!
youre a god send bro thanks
what is the name of the transistor used in the breadboard circuit
No electronic breaking?
Awesome!
Will it work if i reverse the npn n pnp transisotr. I mean what will happen if i place npn instead of pnp and pnp instead of npn. Help me i am in trouble.
It won't work.
Problem is PNP transistors are more expensive and lot less available than NPN, so many H bridge circuits use all 4 the same NPN transistors, this is where it starts to get more complicated, you cant join their bases together, so could you do an H bridge circuit using all 4 NPN transistors
They cost the same. A couple of dollars each.
700th subscriber (turned 669 to 700)
Thanks.
thanks
great explanation
what kind of pnp and npn?
557 and 547
i like it
Can u give parts description please
Yaser Ibrahim, as for the demo (I am guessing that is what you are referring to) I believe that I used a pair of 2N3904 NPNs, and a pair if 2N3906 PNPs, they are small signal BJTs that I happened to have around, not ideal for doing what I did, but they were sufficient to illustrate the demo. I also can't remember if I mentioned it in the video, but this circuit is put nicely into a single IC (well there are many other ICs which also do this) which is the L293D H Bridge
thank you Bobby! great tutorial. and thumbs up and a sub from me.
4:11
You actually know in a H bridge np transistors are at top and pnp are at bottom right? You draw it wrong
I wonder where bro is now …….
Use CMOS
wrong circuit
he needs to put another npn transistor or a diode between the pnp and npn transistor.
No offense, but that was a pointless example. The circuit required you to manually switch wires from v+ to v-. You could skip the transistors and do that with just the wires. I understand what you were trying to teach but it would have been more useful if you connected it to two switches or and ldr so that this circuit could actually be useful and the explanation wouldn't appear pointless.
too much talking than demo