Best one yet. Brilliant video. It really helps the visual learners when you laid out the components on the diagram. My son finally got it! This really put all the pieces together in a great package. It is a wee bit fast, but honestly no issue since you can pause and play as needed. Well done!
I can say that the rather low efficiency of ur circuit is due to the 7805 linear regulator used to power the attiny with 5 volts. You could use a smaller Buck converter module for that but that'll totally destroy the diy aspect. Great work as allways
Great video as always. I like how your videos are structured, it explain things at the beginning, then do the practical stuff. As usual, your video give me better understanding on electronics.
The main problem with switching power supply is the noise ( the impulsive ripple which can reach very high values ) do you think you can make a video about that, maybe analyzing the best low pass filter yo make it more " linear "? :D
An approach to solve this is to set the output voltage 2-3 V higher than what you want, and the use a linear regulator/LDO in series. They have very little noise. So the linear regulator would be a post-regulator, and the buck/boost would be a pre-regulator.
@@thephlophers That would be with a regulating LDO like the LM317, keep the same deal of a little above wanted voltage and drop the rest with the LDO, now, how to control both at once is another story...
I am sooo beginner for your projects most of the time. I wish i fully understand. But when i am not that a beginner you are like an enclopedia for me :)) thanks again man
4:58 You don't even need an OP-AMP! Just create a voltage devider between the +5v rail and the output, read the voltage and scale it in software😎 Works just as well and saves time, money, space and power!
@@nielsdaemen acutually, I checked, and yes, you could in theory use a voltage divider for suck a task, the problem is that the voltage divider would load the output, thus decreasing output stability.
The designs problem is, that the output has always the mosfet/inductor switching voltage as an offset to the input. that can lead to serious emc/radiation problems. by switching the diode and the cap, you solve the problem, ending with a standard boost topology which has the input+ voltage as gnd- for the output voltage. just the absolute opposite to the flyback. the main differences between all 4 possible combinations are if the input can be capacitor referenced to the output, if we need high side switching and if we need galvanic isolated dc voltage level to power on an additional "output on/off" mosfet. there is not the best design (otherwise the others were not in use). Thanks for your guides and tips :)
Well, I think the low efficiency is because the capacitor always discharges through R4 and R3 in off time, and although the value of R3 and R4 are high, the capacitance of C4 is very low, so a considerable loss per cycle contributes in an overall reduction in efficiency.
I have to say, everytime I see you explaining and creating diagrams of circuitry, it sparks my interest in learning more about it and being able to reach that knowledge you have as well (someday) Any recommendations of things to learn to be able to be on the right track?
Scott can you make more projects in one week . I will be very thankful to you if you do. your projects are worth apprectation. It is very learning for students.
Awesome man, love your videos! I can't really keep up with them all the time, so I have to pause and research every so often, but that is way, way better than having a 30 minute video that goes into every excruciating detail.
This is that i search for weeks, and is best, i want to convert an ATX power supply in lab source and intelligent charger, with this I feel that i can reach my purpose
Deine Videos sind simple und gut zu schauen. Und dein Vorgehen ist super, erst Grundlagen, dann Bau ist genial. Nutzung der Englischen Sprache hilft auch ne Menge.
Just found your channel today and subscribed, I will need to see all your old movies now :) Thanks for sharing them with us.... Note: not all of us have an +11K euro oscilloscope, 500 Euro multimeter, etc.... I assume this is not only an hobby for you.
nice project again... a opamp in the output it is nice to control voltage by reference.. but what about current? can we have good current in the output from it?
Thanks for your contribution to the development of knowledge, I have learned a lot about this type of switched sources. Tip: You may be able to extend your tutorials to design half brigde or push pull converter topologies. Thank you!!
Great video man! Thanks for sharing practical knowledge. The position of the switch must be on the low side for practical reasons. With high side switch, there will be negative voltage on the source when diode is conducting and you can not use bootstrap method to drive the MOSFET than. You saved me time, thanks again.
wow！love it! I will be building one this week. Questions: 1 what is the frequency? Increasing frequency might be helpful to efficiency and you can do it with Arduino. 2 why not use a resistor valtage devider for feedback？ 3 will you please uplode the code for multi chanal version on instructbles? Thankyou.
Another great video... Question: You calculated the efficiency of your own buck/boost converter at 80% on the boost or buck side... is that about the same as a standard commercial buck/boost? If not.. .how do commercial manufacturers accomplish higher efficiency? ... and thanks for the insights.
Great video and explanation. Thank you, I really appreciate it. I wonder in the same time if ATTINY85 could be replaced with something else and increase the efficiency through that solution?
Love the videos. I have a question I think you could answer quickly for me. In terms of efficiency and energy waste, Charging with wind or solar )low voltage(, would it be reasonable to charge the cap bank closer to 75% of it's max only to bump back down to a lower voltage on the load? would this extend the time or just waste energy in the conversion?
Could you please make a video about how to build your own cc/cv power source? I mean building it from scratch. Thank you a lot. Btw. Your videos are so good and helpful. You brought me into electronics.
A linear voltage regulator has a dropout voltage. So it could work with voltages of (for example) 12.6V and above. A linear regulator can also not step up voltage and they are not efficient.
Gee.. i am still learning LTspice and setting up various circuits for some practical experience? Soo... greatscott... this seems like a good one to simulate... thanks...:)
Hi Great Scott, can you make a video about a UPS design for providing battery backup for DC devices such as routers, switches, access points etc? Kind of like a battery charger circuit combined with a SMPS
Would it be possible to use the Buck/Boost Converter for a solar cell to actually create a regulated constant output voltage? I'm asking since I'm actually interested in loading LiPo cells over a solar cell with a non MPPT BatteryCharger IC I have laying around. I know that you already showed a possible way to charge a LiPo cell with a CNXXXX-IC but I actually want to use the Buck/Boost Converter for other projects too and since it has a probrammable ATtiny85 it would be also usefull to implement other functions too.
Not an expert personally, but I'd gather from the formula: V = L * di/dt that for higher frequencies where di/dt is going to be much higher, a relatively lower inductance value is necessary (e.g. for radio frequency chokes). Regarding anything else, all of my electrical engineering friends tend to just guess an appropriate value when they're prototyping and work it out further from there, it seems. At least, I couldn't get a straight answer from them.
Hi. Very nice video, GreatScott! As always. I have a doubt, though: i may be wrong, but isn't "flyback" the name given to the "transformer" in a buck-boost converter topology? As long as i know, you implemented a buck-boost converter only. The flyback converter should have a transformer between circuits, shouldn't it?
Excellent video. I have one problem boosting the voltage. Without load it reaches high voltage higher than input but when i connect a load it doesn't boost the voltage. I didn't use feedback because it was for experiment. Is that the problem
But the electrons are really flowing from the negative to the positive side of the capacitor. Not from positive to positive. I really don't like "conventional current" it makes everything more difficult. I wish everyone could just agree that electrons and current flow from negative to positive.
There's a serious question nobody ever seem to answer. Say you have a class A/B audio amp and you only run it at half the level for the best audio possible and you need a certain voltage, how do we get rid of all of that noise and ripple? Do you use a resister between the pos and neg? If so how do we figure out what value?
Hello Great Scott! Im just wondering about MCP602. Can I use an alternative for that like LM358 instead of that. Stores here dont have any of it. Or could you suggest aside from LM358? It would be a great help ;) thanks :D
Great job! I got a question. Where should i connect the Load in the N-Mosfet circuit? Is there a way to turn-off the circuit if i drive it with a micro?
+GreatScott! Some questions: 1. How did you measure the inductance of a coil? (equipment) 2. Can there be an IC which uses MOD function? i.e. which gives value of the voltage irrespective of polarity 3. Can there be an IC which inverses the voltage value? i.e. +5.5 V to -5.5 V 4. What is the maximum current rating of the circuit you built? Btw, I am a student of Elec. Engg and a huge fan of your video channel.
1. Got mine off eBay. Search for lc200a. Cheap and measures a very wide range of inductance. For 3, you can use a boost converter to boost the 5.5 V to 11V. Connect your target circuit with its ground to the power's 5.5V, the target circuit's +5.5V connected to the power's 11V and the target's -5.5V connected to the power's ground.
Great Scott! Please answer this. Can i use arduino uno directly instead of ATtiny85. If so, do I need to change the program? Please guide me to do it. Thank you.
Do I need flyback functionality if I want to use this as battery charger? If I had it wouldn't it just increase amperage until something breaks. Also if I want higher power does it mean that I need to spec every component to that voltage and amperage I would be using.
Amazing tutorial GreatScott ("',), I am building a wind turbine and I'd like to know if i can use this circuit to charge a 12V battery (through a diode) from the fluctuating voltage of the wind generator ?
IF you wanted to improve efficiency could you set them up as separate circuits and use a mosfet to control which circuit needs to be used? do you understand what i mean?
A very good vedio but how can we contact you sir for share your problem if we try to make buck boot converter on higher voltage ⚡ input 100 volt DC to 350 volte DC output 350 volt about 12 amps
Great video, I was wondering if the commercial buck-boost board you show at the beginning has a different type of circuit than you make? I noticed that it has two inductors on it unlike your design.
Please make video about buck/boost converter with output voltage and current adjustment. How to adjust the output current and support constant output voltage simultaneously?
When using this in a flashlight, I guess it is smarter to rather use two LiIon Cells in series and a buck converter, right? But then, charging is more complicated...
Hi I am big fan of ur and ur videos, I am software engineer bt don't know basic things of electronics. I want to start learning this. Can you suggest any book from where I can start
Hi scott is it true that the circuit could be very dangerous if no load is connected and a high duty cycle switch the mosfet becourse the voltage could get very high ?
That's awesome! i never thought that inverting buck converter can function as a boost converter as well, but is it possible to replace the opamp by optocoupler as a feedback to the ATtiny?
Yes it is, but the voltage won't be so stable after it. Btw you don't have to use a microcontroller, I have built a buck-boost converter using an op amp, an optocoupler and a 555 timer as a control chip.
@@davidfelipecastroarias8137 You have to connect the optocoupler between pins 8 & 7 of 555 with a resistor in series, gate of the mosfet is connected to the output of 555 via for example 10ohm resistor. Then, diode of the optocoupler can be driven by TL431 or an opamp, by varying the current flowing through it, you change the duty cycle. I have already built several converters this way, and they work flawlessly
@@pir869 he was only said the efficiency compared to a buck and boost converter individually. He never compared it to a market bought buck/boos converter
great Scott thank you.it will help a lot. but can you use 555 timer instead of 85. 85 is difficult and not available in neer store. Try making one with 555 okay please.😊
hey great scott, can i use a buck boost to get a 5v output from a li ion 3.7v ? . i didn,t understand if the voltage of a prebuild buck boost converter is stuck in 12v.. i really like your videos and i would like to learn more about it
Best one yet. Brilliant video. It really helps the visual learners when you laid out the components on the diagram. My son finally got it! This really put all the pieces together in a great package. It is a wee bit fast, but honestly no issue since you can pause and play as needed. Well done!
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Since I'm already pursuing EE, your videos and its depth of knowledge are always ready to put me in action. Thanks for your existence.
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I can say that the rather low efficiency of ur circuit is due to the 7805 linear regulator used to power the attiny with 5 volts.
You could use a smaller Buck converter module for that but that'll totally destroy the diy aspect.
Great work as allways
You seem to have your passion, friend. And you're damn good at it.
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Your videos changed my life! I wouldn't be where I am at this point if it weren't for these amazing tutorials.
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Im not building anything, no fking clue what hes talking about...still love to watch these videos. :D
hes talking about buck rogers and the temple of doom
Great video as always. I like how your videos are structured, it explain things at the beginning, then do the practical stuff. As usual, your video give me better understanding on electronics.
pm me can you to install do solar panel of charger,
The main problem with switching power supply is the noise ( the impulsive ripple which can reach very high values ) do you think you can make a video about that, maybe analyzing the best low pass filter yo make it more " linear "? :D
it would be interesting to see output on harmonic analyzer
An approach to solve this is to set the output voltage 2-3 V higher than what you want, and the use a linear regulator/LDO in series. They have very little noise. So the linear regulator would be a post-regulator, and the buck/boost would be a pre-regulator.
@@thephlophers That would be with a regulating LDO like the LM317, keep the same deal of a little above wanted voltage and drop the rest with the LDO, now, how to control both at once is another story...
I am sooo beginner for your projects most of the time. I wish i fully understand. But when i am not that a beginner you are like an enclopedia for me :)) thanks again man
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Day by day he is progressing and his english akcent is much much improved ..............
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I am 100% Sure That Great Scott Will Go really really Far.
Best wishes man. :))
He is near one million subscribers now.
He's at 1 million now.
@leafonabreeze 1.19
1.25
@@joa4935 1.47
4:58 You don't even need an OP-AMP! Just create a voltage devider between the +5v rail and the output, read the voltage and scale it in software😎
Works just as well and saves time, money, space and power!
The output is inverted
@@baoxuezhang3300 Yes, but if you make the devider so that even at the max negative output it does not go below 0v on the analog input it works fine!
@@nielsdaemenhow though? The “voltage divider” you are describing is capable of inverting voltages, and that is no different to an op-amp
@@nielsdaemen acutually, I checked, and yes, you could in theory use a voltage divider for suck a task, the problem is that the voltage divider would load the output, thus decreasing output stability.
The designs problem is, that the output has always the mosfet/inductor switching voltage as an offset to the input. that can lead to serious emc/radiation problems. by switching the diode and the cap, you solve the problem, ending with a standard boost topology which has the input+ voltage as gnd- for the output voltage. just the absolute opposite to the flyback. the main differences between all 4 possible combinations are if the input can be capacitor referenced to the output, if we need high side switching and if we need galvanic isolated dc voltage level to power on an additional "output on/off" mosfet. there is not the best design (otherwise the others were not in use). Thanks for your guides and tips :)
We appreciate the work you put into preparing and drawing those schematics while explaining it. Never doubt that.
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it is incredible the way you clearly make things easy
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Well, I think the low efficiency is because the capacitor always discharges through R4 and R3 in off time, and although the value of R3 and R4 are high, the capacitance of C4 is very low, so a considerable loss per cycle contributes in an overall reduction in efficiency.
can you explain more about this, why the capacitor can discharge for r3 r4 during close cycle. thank u
I have to say, everytime I see you explaining and creating diagrams of circuitry, it sparks my interest in learning more about it and being able to reach that knowledge you have as well (someday) Any recommendations of things to learn to be able to be on the right track?
Great video! I love these videos because they pack so much information into a relatively short video. Keep up the great work!
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I don't know what you are doing, but it looks fun
I had no idea such a thing existed. Thank you!
This is an excellent project for an engineering student.
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Another fantastic video. I am going to try all three projects; Buck, Boost and the Buck/Boost. Very nice instructions.. Thanks
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Scott can you make more projects in one week .
I will be very thankful to you if you do.
your projects are worth apprectation.
It is very learning for students.
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Very nice video. Now I know, how are the China boost converters exactly working. Thanks for it!
Awesome man, love your videos!
I can't really keep up with them all the time, so I have to pause and research every so often, but that is way, way better than having a 30 minute video that goes into every excruciating detail.
pm me can you to install do solar panel of charger,
This is that i search for weeks, and is best, i want to convert an ATX power supply in lab source and intelligent charger, with this I feel that i can reach my purpose
Deine Videos sind simple und gut zu schauen.
Und dein Vorgehen ist super, erst Grundlagen, dann Bau ist genial.
Nutzung der Englischen Sprache hilft auch ne Menge.
Your truly great , left when the channel had 100 k subs , Great man now your have Half a mil . Keep up the great job scott .
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Just found your channel today and subscribed, I will need to see all your old movies now :) Thanks for sharing them with us.... Note: not all of us have an +11K euro oscilloscope, 500 Euro multimeter, etc.... I assume this is not only an hobby for you.
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I was expecting this video to release finally it has come
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nice project again... a opamp in the output it is nice to control voltage by reference.. but what about current? can we have good current in the output from it?
Thanks for your contribution to the development of knowledge, I have learned a lot about this type of switched sources.
Tip: You may be able to extend your tutorials to design half brigde or push pull converter topologies.
Thank you!!
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Nice video thank you sir , is necessary to use microcontroller
interesting working principle of boosters circuitry. many thanks !
I have no idea But I really enjoy you soldering.great vid
Great video just like Great Scott.....but is it possible to achieve the same results without any microcontroller?
This dude is Einstein the second :) keep up the good work!
Great video man! Thanks for sharing practical knowledge. The position of the switch must be on the low side for practical reasons. With high side switch, there will be negative voltage on the source when diode is conducting and you can not use bootstrap method to drive the MOSFET than. You saved me time, thanks again.
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wow！love it! I will be building one this week.
Questions:
1 what is the frequency? Increasing frequency might be helpful to efficiency and you can do it with Arduino.
2 why not use a resistor valtage devider for feedback？
3 will you please uplode the code for multi chanal version on instructbles?
Thankyou.
2: I think because its inverted, so it is -5V and not 5V. This damages the ADC
You are right, thankyou
You're welcome :)
I believe you can use a capacitor for feedback. Not the best, but will work with a little bit of conpensation while coding.
So.. what is the frequency value he is producing?
Another great video... Question: You calculated the efficiency of your own buck/boost converter at 80% on the boost or buck side... is that about the same as a standard commercial buck/boost? If not.. .how do commercial manufacturers accomplish higher efficiency? ... and thanks for the insights.
Great video and explanation. Thank you, I really appreciate it. I wonder in the same time if ATTINY85 could be replaced with something else and increase the efficiency through that solution?
Great video! What would you do to increase the efficiency?
so using the "directIO" library for the arduino should help out with the switching frequency.
Love the videos. I have a question I think you could answer quickly for me. In terms of efficiency and energy waste, Charging with wind or solar )low voltage(, would it be reasonable to charge the cap bank closer to 75% of it's max only to bump back down to a lower voltage on the load? would this extend the time or just waste energy in the conversion?
What can we use as an alternative Mcp602 ?
You deserve more subscribers. Superb quality videos that are very informative and easy to understand.
pm me can you to install do solar panel of charger,
Could you please make a video about how to build your own cc/cv power source? I mean building it from scratch. Thank you a lot.
Btw. Your videos are so good and helpful. You brought me into electronics.
good video!, but, why wouldnt you use a Voltage regulator to keep 12 stable volts instead of the buck/boost converter?
A linear voltage regulator has a dropout voltage. So it could work with voltages of (for example) 12.6V and above. A linear regulator can also not step up voltage and they are not efficient.
its less efficient and the linear voltage regulator can't regulate unless the voltage supplied to it is a few volts greater than the desired voltage
Thanks!
FYI, the module you've shown is most likely a SEPIC, not a buck-boost. Buck-boost uses just one choke. Correct me if I'm wrong.
Gee.. i am still learning LTspice and setting up various circuits for some practical experience? Soo... greatscott... this seems like a good one to simulate... thanks...:)
Finally somebody explained what voltage feedback means! Keppp up the good work!
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Very interesting video, I had no idea you could create a buck/boost with only one inductor.
easy eda
Hi Great Scott, can you make a video about a UPS design for providing battery backup for DC devices such as routers, switches, access points etc? Kind of like a battery charger circuit combined with a SMPS
Would it be possible to use the Buck/Boost Converter for a solar cell to actually create a regulated constant output voltage? I'm asking since I'm actually interested in loading LiPo cells over a solar cell with a non MPPT BatteryCharger IC I have laying around. I know that you already showed a possible way to charge a LiPo cell with a CNXXXX-IC but I actually want to use the Buck/Boost Converter for other projects too and since it has a probrammable ATtiny85 it would be also usefull to implement other functions too.
Yes, you could even do your own MPPT
Could an inverting buck-boost be used as a "constant wattage" dc supply?
but how do i boost my duck
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Great tutorial. How to calculate the inductor value needed?
Not an expert personally, but I'd gather from the formula: V = L * di/dt
that for higher frequencies where di/dt is going to be much higher, a relatively lower inductance value is necessary (e.g. for radio frequency chokes). Regarding anything else, all of my electrical engineering friends tend to just guess an appropriate value when they're prototyping and work it out further from there, it seems. At least, I couldn't get a straight answer from them.
Hi. Very nice video, GreatScott! As always.
I have a doubt, though: i may be wrong, but isn't "flyback" the name given to the "transformer" in a buck-boost converter topology? As long as i know, you implemented a buck-boost converter only. The flyback converter should have a transformer between circuits, shouldn't it?
No soy muy bueno con el inglés, pero es emocionante ver tus vídeos. Saludos!
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Excellent video. I have one problem boosting the voltage. Without load it reaches high voltage higher than input but when i connect a load it doesn't boost the voltage. I didn't use feedback because it was for experiment. Is that the problem
Great video as always but cant it be dont without a arduino???
echt schade, dass die Videos nicht auf deutsch sind, trotzdem einen Daumen nach oben
Great Scott! You just earned yourself a new subscriber. Your videos are so informative.
So the efficiency would be better if you use the Non-Inverting Version since you use two curcuits with an efficiency of 95/90 %?
Nice video! Instead of the cmos op-amp a regular one like the 741 could be use?
But the electrons are really flowing from the negative to the positive side of the capacitor. Not from positive to positive. I really don't like "conventional current" it makes everything more difficult. I wish everyone could just agree that electrons and current flow from negative to positive.
We can blame Ben Franklin.
As long as you understand the situation you should have no problems.
There's a serious question nobody ever seem to answer. Say you have a class A/B audio amp and you only run it at half the level for the best audio possible and you need a certain voltage, how do we get rid of all of that noise and ripple? Do you use a resister between the pos and neg? If so how do we figure out what value?
Hi, great video, can you tell me what internal osc. did you use ?
Nice Video as always ! 👌😀
Thanks ;-)
what pens do you use
thanks
👍👈👉✌😐😕😶😯😟😦😧😎😘
fineliner
Hello Great Scott!
Im just wondering about MCP602. Can I use an alternative for that like LM358 instead of that. Stores here dont have any of it. Or could you suggest aside from LM358?
It would be a great help ;) thanks :D
thank you very much. please keep making these videos. they are very appreciated!
Great job!
I got a question. Where should i connect the Load in the N-Mosfet circuit? Is there a way to turn-off the circuit if i drive it with a micro?
Do you plan to show us an approach of an efficient balanced LiIon charger?
+GreatScott!
Some questions:
1. How did you measure the inductance of a coil? (equipment)
2. Can there be an IC which uses MOD function? i.e. which gives value of the voltage irrespective of polarity
3. Can there be an IC which inverses the voltage value? i.e. +5.5 V to -5.5 V
4. What is the maximum current rating of the circuit you built?
Btw, I am a student of Elec. Engg and a huge fan of your video channel.
A full-wave rectifier, or an operational amplifier setup the right way, IIRC.
I did not understand. Elaborate please.
1. Got mine off eBay. Search for lc200a. Cheap and measures a very wide range of inductance. For 3, you can use a boost converter to boost the 5.5 V to 11V. Connect your target circuit with its ground to the power's 5.5V, the target circuit's +5.5V connected to the power's 11V and the target's -5.5V connected to the power's ground.
Thanks for info.,
Keval Pandya he uses a transistor tester to measure inductance of a coil. Btw all the best for ur engineering
Great Scott! Please answer this.
Can i use arduino uno directly instead of ATtiny85. If so, do I need to change the program?
Please guide me to do it. Thank you.
Do I need flyback functionality if I want to use this as battery charger? If I had it wouldn't it just increase amperage until something breaks. Also if I want higher power does it mean that I need to spec every component to that voltage and amperage I would be using.
Amazing tutorial GreatScott ("',), I am building a wind turbine and I'd like to know if i can use this circuit to charge a 12V battery (through a diode) from the fluctuating voltage of the wind generator ?
My hunch is yes, but should regulate to get higher than 12V to charge
Awesome engineering & teaching as usual!!
thats it im making one that 300percent efficient!! free energy for all!!
Still watching! Great vids!
Gee, that is quite innovative. very clever, and the video fast yet very informative. Thanks, I enjoyed it...
IF you wanted to improve efficiency could you set them up as separate circuits and use a mosfet to control which circuit needs to be used? do you understand what i mean?
A very good vedio but how can we contact you sir for share your problem if we try to make buck boot converter on higher voltage ⚡ input 100 volt DC to 350 volte DC output 350 volt about 12 amps
Great video, I was wondering if the commercial buck-boost board you show at the beginning has a different type of circuit than you make? I noticed that it has two inductors on it unlike your design.
you can get ride of the attiny by repleasing it with an op amp and a tri osilliator
Please make video about buck/boost converter with output voltage and current adjustment. How to adjust the output current and support constant output voltage simultaneously?
Great video. Do you plan on making higher powered flyback circuits?
Not yet.
When using this in a flashlight, I guess it is smarter to rather use two LiIon Cells in series and a buck converter, right? But then, charging is more complicated...
same here. I need a 30A flyback circuits.
OK, this might be a dumb question but why not use an LM-317T ? wouldn't the feedback keep the output swings in check?
03:43 "a small load of a milliohm"
Hi I am big fan of ur and ur videos, I am software engineer bt don't know basic things of electronics. I want to start learning this. Can you suggest any book from where I can start
"The arts of electronics"
Thanks this will be a great help
Wonder if this was asked already, but, simple. How much times researching average count of your project?
Hi scott is it true that the circuit could be very dangerous if no load is connected and a high duty cycle switch the mosfet becourse the voltage could get very high ?
what can I say more? GREAT SCOTT!
That's awesome! i never thought that inverting buck converter can function as a boost converter as well, but is it possible to replace the opamp by optocoupler as a feedback to the ATtiny?
Yes it is, but the voltage won't be so stable after it. Btw you don't have to use a microcontroller, I have built a buck-boost converter using an op amp, an optocoupler and a 555 timer as a control chip.
@@__MINT_ you can input straight the 555 pwm to the mosfet? And how do you apply control with those?
@@davidfelipecastroarias8137 You have to connect the optocoupler between pins 8 & 7 of 555 with a resistor in series, gate of the mosfet is connected to the output of 555 via for example 10ohm resistor. Then, diode of the optocoupler can be driven by TL431 or an opamp, by varying the current flowing through it, you change the duty cycle. I have already built several converters this way, and they work flawlessly
Heey, good video. I have a question: What is the efficiency of your model? Is it comparable to the bought converters?
he told you in the video,maybe you should watch it again and pay attention.
@@pir869 he was only said the efficiency compared to a buck and boost converter individually. He never compared it to a market bought buck/boos converter
great Scott thank you.it will help a lot. but can you use 555 timer instead of 85. 85 is difficult and not available in neer store. Try making one with 555 okay please.😊
It won't work most likely as the 555 isn't that stable.
hey great scott, can i use a buck boost to get a 5v output from a li ion 3.7v ? .
i didn,t understand if the voltage of a prebuild buck boost converter is stuck in 12v..
i really like your videos and i would like to learn more about it
Rather than a programming shield for attiny85 , i use it with optiboot bootloader and a usb to serial adapter.
Nice video! Why didn't you try a building a SEPIC step up/down converter?
this might be a stupid question, but how does the current behave?
what was the sensitive circuit you wanted to power...just curious