This looks like a cool design. I designed something like this in 1978. I also made it a stabilized regulator with feedback. At that time there were very few regulator IC's. Now you can use a UC3843 and drive the transistor with pwm so you get voltage regulation and current limit protection and you can use a MOSFET as the transistor. Use the TL431 and an opto for regulation and feedback. The small transformer will give you the AuxVDC for the controls. You can get galvanic isolation from the mains by using a 1:1 isolation transformer and the secondary will be the output similar to a Variac.
Yes, it is a nice circuit design from the past. It is interesting to get a simple solution for today which has not these high amount of losses. I think today one would chop the input voltage by use of PWM and voltage / crossover detection. In order to drive the output I think you need a MOSFET H-bridge with a full bridge or two half bridge drivers. You can apply a low PWM frequency like 0.5 to 1 kHz. So you can keep the switching losses extremely low. Probably you will need no heat sink for MOSFET full bridge even for higher powers in the kW range.
Thank you for another very fine description of a project, and the explanation of its origin, and producing it. Very nicely done. You have a very soothing voice, and articulate very well, very clear and easy to understand. I've worked in electronics for a long time, but learn something from every project. Thank you again, for a fine presentation.
@@wickedprotos1937 Thanks! That puts a long lost piece of the puzzle into place in my mind. Seen SCRs used in application that clearly deal with AC and wondered how they did it (never analyzed the circuits).
@@miklov Cool. You can also use an IGBT or big mosfet as rated for this. I had a use where I needed fast pwm of the AC waveform for a lighting control to avoid the 50/60hz hum, so I used a big mosfet there.
I watching kaysanTV for a long time already, but really hardly seen ever that he answered any questions from his viewers, so anyone else ever seen him answer questions?
Very clear explanations as usual. I will control many devices with this. It can even be used as a soft start circuit. Right? Thanks for sharing. You are a light 💡 in my way.
Thanks for sharing this wonderfull simple circuit.. This is the circuit im looking for quite long..😀 Kaysian TV pls change title as "Mains voltage Regulator" is suitable name.😊
That's a very clever circuit. As long as your circuit is resistive it should drop the voltage in a very linear way, as it's a current regulator, not a voltage regulator.
Great circuit fun as usual, thanks! Just at 10:00 you say that the output is galvanically isolated from the mains which I think is incorrect. I believe you mention earlier in the video that it isn't isolated. Really appreciate your work, thanks... :)
The way the transistor is used to switch AC is nice but the control circuit is lacking. You know what this makes me want to jump over to ltspice and make something better :)
Is the regulator adding its rectified voltage to the primary input on the transformer? And then sending it to the output??? please anyone??? or is it regulating the secondary of the transformer??? ANYONE???
it's amazing because, it shows back in those days, how people stormed their heads and came up with different solutions when they did not have varieties of easy going parts at hand. :)
This looks like a cool design.
I designed something like this in 1978. I also made it a stabilized regulator with feedback. At that time there were very few regulator IC's. Now you can use a UC3843 and drive the transistor with pwm so you get voltage regulation and current limit protection and you can use a MOSFET as the transistor. Use the TL431 and an opto for regulation and feedback. The small transformer will give you the AuxVDC for the controls. You can get galvanic isolation from the mains by using a 1:1 isolation transformer and the secondary will be the output similar to a Variac.
Yes, it is a nice circuit design from the past. It is interesting to get a simple solution for today which has not these high amount of losses. I think today one would chop the input voltage by use of PWM and voltage / crossover detection. In order to drive the output I think you need a MOSFET H-bridge with a full bridge or two half bridge drivers. You can apply a low PWM frequency like 0.5 to 1 kHz. So you can keep the switching losses extremely low. Probably you will need no heat sink for MOSFET full bridge even for higher powers in the kW range.
The circuitry was truly amazing to me.Thanks and expecting such noveltys
Thank you for another very fine description of a project, and the explanation of its origin, and producing it. Very nicely done. You have a very soothing voice, and articulate very well, very clear and easy to understand. I've worked in electronics for a long time, but learn something from every project. Thank you again, for a fine presentation.
First circuit was really fabulous
Cool! Never realized you could use a DC switching element with a full bridge rectifier to make an AC switching element =D
Commonly used to allow an SCR to act similarly to a triac.
@@wickedprotos1937 Thanks! That puts a long lost piece of the puzzle into place in my mind. Seen SCRs used in application that clearly deal with AC and wondered how they did it (never analyzed the circuits).
@@miklov Cool. You can also use an IGBT or big mosfet as rated for this. I had a use where I needed fast pwm of the AC waveform for a lighting control to avoid the 50/60hz hum, so I used a big mosfet there.
The gate drive needs to be isolated optically or otherwise usually.
I watching kaysanTV for a long time already, but really hardly seen ever that he answered any questions from his viewers, so anyone else ever seen him answer questions?
10:28 "LATR" = autotransformer in English. Thanks for another interesting video :-)
And thanks for that translation, appreciated.
Was waiting eagerly for your upload.. Thank you! You are amazing❤
You should atleast have 20 lakh subscribers
Keep it up. Good work.
Very clear explanations as usual. I will control many devices with this. It can even be used as a soft start circuit. Right? Thanks for sharing. You are a light 💡 in my way.
I really like jlcb services but for diy hobbies hand made pcb give pleasure.
Arthur, to the top !!!
Wow! ingenious circuit.
Thanks for sharing.
Thanks for sharing this wonderfull simple circuit.. This is the circuit im looking for quite long..😀
Kaysian TV pls change title as "Mains voltage Regulator" is suitable name.😊
That's a very clever circuit. As long as your circuit is resistive it should drop the voltage in a very linear way, as it's a current regulator, not a voltage regulator.
Great circuit fun as usual, thanks! Just at 10:00 you say that the output is galvanically isolated from the mains which I think is incorrect. I believe you mention earlier in the video that it isn't isolated. Really appreciate your work, thanks... :)
A LATR (autotransformer) is also not galvanically isolated from mains voltage (except you apply an isolating transformer on its input).
merci de partager !!
The way the transistor is used to switch AC is nice but the control circuit is lacking.
You know what this makes me want to jump over to ltspice and make something better :)
Hey kasyan great work i know you are the best you sill got it keep like this.
This is the reason i are subscribe to your chanel
Thanks
Such manly hands for such a sweet voice!
I vote for the voice. LOL
Hmm any ideas why the waveform gets distorted at lower voltage? Is the transistor not staying in linear mode for some reason?
Is the regulator adding its rectified voltage to the primary input on the transformer? And then sending it to the output??? please anyone??? or is it regulating the secondary of the transformer??? ANYONE???
ممكن حضرتك تساعديني في الحصول على دائره تتحكم في 50 فولت و20 أو 30 امبير
Please make a smps of 24v 40-60a appreciate your work
Can you please make a simple buck boost converter
Make a buck converter for making variable powersupply with short circuit protection
Already did
Make Oscillator Pure Sine 60Hz.
Greetings from Brazil.
u forgot the "r"
I wouldn't call anything this inefficient "amazing."
it's amazing because, it shows back in those days, how people stormed their heads and came up with different solutions when they did not have varieties of easy going parts at hand. :)
Awful Indian accent...
Don't
Everyone respect others language and accent
What wrong with you sir