Awesome circuit and explanation. Thanks for sharing this.

São vídeos como seu que me incentivam a prosseguir em aprender Eletronica- Parabéns ,Like

Thank you for the video... Much appreciated...✌

Thanks for sharing

thank you for video

Can you do a circuit for a 4.5 volt DC 3 volt motor, push start for ten seconds whilst playing music? I have a toy car and am trying to replicate the PCB which is destroyed 👍

الف شكر ❤

Narrated functional schematic with analysis of pros and cons, improvements suggestions as well, depending on applications. Perhaps test under load and current measurement with and without heat sink? Anyway it's for us to try. Thanks for presentig this simple approach.

@LariFariYoutube

Жыл бұрын

Hi, Francois..To be honest, this very simple soft start is dedicated to people who dont have the knowledge to even understand complex measuring processes.. There are so many tinkerers out there with very little experience and they are looking for super simple circuits... As i said in the video, i bymyself would not use this softstart.. I usually make soft starts with a microcontroller, wich is definitly the best option.. But since there is so much interest, i will perhaps revisit the subject and do a more detailed video on the thing... But anyway... it consists of just a few parts.. It is easy to try it and experiment with the circuit... It dont take much time, money or effort.. ;) Greets from Germany..

@francoisguyot9770

Жыл бұрын

@@LariFariKZread I was looking to provide a soft start on my grandson's toy cart as they jerk quite a lot upon depressing thepedal. After watching your video, I was convinced that investing a little time rehearsing my Arduino skills would pay off. So I'm settling for a full H-bridge BTS796 which costs only $4.83 on Ali Express, shipping included! Even though they claim it is a Stepper Motor driver, it only offers 2 line output to drive the motor. So I''ll assume that it is more adapter to drive a medium size DC motor.

Im looking to add this to my 12 V my kids car battery, because its always had jump start when i push forward and sudden stop. I want to be as soft as possible when it start moving.. good video

@saifialeem8255

Ай бұрын

How many mosfets did you use? Did you manage to get it working? I have to drive a 250W load with a 12V power supply so I might need to tweak the circuit. Please share your experience

Very educative, thank You. If I have a DC motor that is reversible (+ and - switching depending on which rotation I want through a controller) how would I use this soft start PCB?

@LariFariYoutube

Жыл бұрын

A possible solution would be: PWM controller(for motor speed control) --> soft start --> Relais H-Bridge (for motor reverse) --> DC Motor..

I made this circuit for a 12V 8A cooler fan, but I get about 50% power loss with the soft starter connected (it only draws 3.5A on the 12V side) ... Do you have any idea on how to solve that? I use a switch power supply 12V 8.3A

@LariFariYoutube

2 жыл бұрын

Try to measure the gate voltage. After max 5 seconds it should be 10 Volts. (or higher) The datasheet of the IRFZ 44 N calls for 10 Volts at the Gate, to turn the Transistor full on. So virtually no power loss. Replace the 1,8k resistor for a 1,2 or a 1k resistor, to get a higher gate voltage if it is to low. But you have to choose also a higher capacitor value, to get the ramp time, which fits your needs. By the way... as i sayed in the video, for voltages below 20 volts, you dont need the Zener diode, because this Mosfet can handle a maximum gate voltage of 20 Volts. I know, the IRFZ 44 N is not the best choice for this circuit. It could also be an option to try different N - channel mosfets, to find the right one, which works best in conjunction with your Motor. Did you measure the supply voltage, when the Motor is on? Does it stay stable at around 12 Volts when the power supply is under load? This could also be the reason, why the Mosfet does not turn on 100%. I am very busy at the moment, but i will try to find a Motor and a power supply close to your specs and test the circuit in this configuration, to find a solution... As usual...the devil lies in the details. ;)

It sounds like this would work for an electric clutch which is an electromagnet? The normal current draw is 4-6 amps getting up to 10 as the device ages

@LariFariYoutube

Жыл бұрын

Yes, it would work on such a electromagnetic clutch. Do you have problems with high inrush current on such a device?

Reaching out to say - great illustration and narrative on the build of this circuit. Asking two things: can this same thought process be accomplished with an AC motor and are there any tools available to help size the components of the circuit to the AC motor based on the motor specs and application? Thank you for your share!

@LariFariYoutube

Жыл бұрын

Hy, my friend..This is a softstart for DC Loads.. I have a simple soft start circuit video for AC loads on my channel es well.. So check out my video list... Greets from germany

@energydreamer5347

Жыл бұрын

@@LariFariKZread - thank you friend. Do you a recommendation on how I can learn to use the proper sized components for my application? Do you have way I could contact you privately? Thank you sir!

@LariFariYoutube

Жыл бұрын

@@energydreamer5347 There are some basic calculations, which you can do.. But in the end, you will have to make some experiments and find the perfect circuit by trial and error..

220 v için bir önerin var mı ?

Hallo Lari Fari, tolles Video und vertständlich erklärt - genau für jemanden wie mich, der nur wenig Ahnung von der Materie hat... 😵‍💫 Habe da noch zwei Fragen: 1) Du erwähnst, dass man für mehr Stromfluss auch zwei oder drei MOSFETs parallel schalten kann. Wie sieht es bei 10 Stück (=100A) aus z.B. für ein Elektro-Gokart? 2) Wird der Transistor nur während der Einschalt- bzw. Hochlaufphase warm, oder während der gesamten Betriebsdauer?

@LariFariYoutube

Жыл бұрын

Zu Frage 1:Ich habe eine PWM Schaltung für ein E Go kart gebaut, vor einigen Jahren. Das waren sogar 12 Mosfets. Weil 10 A Dauerbelastung für einen IRFZ 44 N ist eigentlich schon viel zu viel. Alle Transistoren parallel... Aber man sollte die Transistoren alle mit dem Komponententester messen und in eine Mosfet Bank nur Transistoren einbauen mit halbwegs gleichen Werten... (G-S Spannung).. sonst machen 2 oder 3 die meiste Arbeit. Zu Frage 2: Leistungstransistoren werden immer warm..Auch wenn die mosfets "voll an" sind...Die meiste Wärme entsteht bei dieser Anwendung hier in der Startphase, weil der Mosfet dann "linear" betrieben wird.... Also er ist nur teilweise an...so ein Zwischenstatus, den man bei Mosfets eigentlich vermeiden sollte... Naja, die Schaltung ist eben super simpel..Da muss man Abstriche machen..Wenn du weißt, wie man mit Arduino umgeht, hätte ich eine komplette Fahrzeugschaltung für dich, samt code... Die habe ich letztes Jahr für einen Patreon entwickelt.

Will a circuit like this prevent e.g., an Arduino, that is running on the same power supply as the DC motor, from shutting down due to power fluctuations? In my specific case I decided to design an electrical cabinet for a small CNC mill with one power supply for both Arduino and spindle motor (24 VDC < 80 watts). I haven’t powered it on yet, but I fear that the Arduino will reboot when I activate the relay to start the spindle.

@LariFariYoutube

Жыл бұрын

How do you power the Arduino? I dont think, you send the 24 Volt right into the "raw" power input pin... This would result in a overheat of the Voltage regulator on the Arduino board. I think ( and hope), you have a step down converter from your 24 Volts to 5 Volts.. But anyway...i dont think, the startup current of the motor is so high that the supply voltage drops under 5 Volt. Chances are very small, that your arduino crashes..But CNC spindle motors... depending on the type of motor... can produce a lot of enterference frequencies... This could lead to malefunctions during the operation of the machine. A friend of mine had a lot of problems like this. A LC filter circuit in the motorline solved the problem. How do you controll the spindle Motor with the Arduino? With a relais or driver / mosfet? If so, let the arduino ramp up the speed of the motor instead of turning it on abruptly.

@RitterDK14

Жыл бұрын

Hi, and thanks for the quick reply. I had planned to power it directly with 24 volts, until yesterday when I realized the voltage regulator on-board only supports up to 2 volts. I am now planning gin using voltage regulators that span from 7-32 VDC to 5 VDC. However I tried this trick before for a GSM-setup (for sending text messages from Arduino), and here the Arduino would reboot whenever the GSM-module tried to establish connection, since the current consumption would go from practically nothing to 2 amps in no time. Here I was suggested to add capacitors at the GSM module to prevent this, but I have not had time to test that yet. I am running the motor with a relay controlled by the Arduino, so it’s going to be instantly 0-100, which made me consider making a soft starter circuit (we use AC soft starters at work, I program robots), in hopes that this would reduce the current spike when turning on the spindle motor. I am aware that the spindle will generate a fair bit of noise, and I am actively trying to figure out where to connect the ground wire on the spindle 😊

@LariFariYoutube

Жыл бұрын

Ok...Adding a capacitor to the supply line of the Arduino is always a good idea..the bigger the better (in a nutshell).. You could use the softstart circuit, to start your spindle motor...thats what is ment to do, but you need to add 2 or more mosfets in pararllel to sread the load and heat.. But i would go another route... Look in the internet for DC motor driver board or simply drive the gate of the Mosfet (s) from an PWM pin of your arduino. Watch my video "high side switch for arduino" .. And let the Arduino do the soft start / ramp... The thing is, you will need a variable speed on your spindle anyway at some point in the future. And for powering the Arduino, dont use a linear regulator. Regulating down from 24 volt to 5 Volt would generate a lot of heat. Thats the disadvantage of linear regulaturs. Look on fleahbay for a step down converter board / buck converter.

@RitterDK14

Жыл бұрын

I will look into this, thanks a lot!

Hi, is it possible to build same softstarter for an 220V DC motor?

@LariFariYoutube

Жыл бұрын

Yes...choose the right Mosfet, flyback diode and resistor values for the voltage divider and you are good to go. ;)

Thanks. Would you say anything such a circuit design that is able to soft start only, solving motor start problem. You know using this type of circuit cuts a certain amount in voltage, ie from 12V to 10V, and this is a undesirable matter. Do you have any idea?

@LariFariYoutube

2 жыл бұрын

Yes...as i sayed, this is the most simple circuit, you can get away with. ;) The Mosfet is used as a variable resistor. After about 2 seconds, the mosfet ist full on...so virtuallly no voltage drop and no heat loss during operation.... A much better solution would be, to use a microcontroller to control the Mosfet. (arduino / attiny)

@baygomer4706

2 жыл бұрын

@@LariFariKZread Thank you very much, I will try.

@LariFariYoutube

2 жыл бұрын

@@baygomer4706 Yes, i think, thats the best way.... This circuit is so simple, it dont take long to build it. ;) Try it and you will see, if this one is suitable for your application. Maybe i will do a video on a more complex version of the thing ... (PWM)

Hello, how would you change the circuit for a low voltage supply, like a 4.2v lithium battery? It would even get lower voltage considering the discharge, like 3V or less. I have a hand vacuum like that.

@felipetomaz1843

9 ай бұрын

The first thing would be the change of the mosfet, but which one for that such low voltage? I know it’s hard to find mosfet dos low voltage use. Thanks

@LariFariYoutube

9 ай бұрын

You need for such low voltage levels a so called "logic level" Mosfet. For instance the IRFL 44 N...or similar. Such a mosfet dont need 10 volt at the gate to turn on 100%. 3 Volt is enough... And you dont need the zener diode.. The two resistor values have to be determand by experimentation. One is for charging the Timingcapacitor, the other one to discharge it, when you turn off your motor.

Ok, so I made this exactly to the schematic. But I see you fail to give the voltage value for the electrolytic capacitor. What will higher or lower values do? I am trying to soft-start a 25V 47000 uF capacitor, but this circuit is not able to do it. Ramp-up is too quick, so just after a third second the circuit has ramped up and drawing full amps. I need this to limit inrush at around 3A, but this circuit allows too much current to rush in. I only need to limit this for a second or so, then the amp draw will go down to only 1A @ 24V . But no matter how I tweak the circuit without adding a resistor, it will still not be soft enough. Any ideas?

@LariFariYoutube

5 ай бұрын

The timing capacitor will get charged up to the full system Voltage. In your case 24 Volt...right? So you need a cap which can handle at least that... the higher, the better... I would suggest a 35 Volt cap. The capacity of this timing capacitor dictates the ramp time...more µF == more ramp time. But keep in mind, as long as the voltage at Gate of the Mosfet is lower than 10 Volts, it runs in the "linear region"... Meaning, it will get hot. It acts like a resistor... So, the longer the ramp time, the more heat will be produced. Probably you would be better of, using a resistor in series to your massive storage cap. This inrush limiting resistor gets bridget by a relais, which kicks in after the required soft start time... I did a somewhat similar thing in my video " AC soft start circuit". But you could also use a simple timing circuit with just one NPN transistor or a 555 Timer IC, to switch such a "bypass relais" .. or even a ready made timing relais circuit for a few bucks.. If you are lazy :D There are so many different ways, to solve this problem.. Depending on your skills and patience. :D

Need sizing or circuit for 900cc motorcycle. Puhlease.

how if i want to make it for 36 Vdc input?

@LariFariYoutube

2 жыл бұрын

The Mosfet IRFZ 44 N cam handle up to 60 Volt...but only 20 Volts at the Gate.... So make the Resistors of same value. (8,2k and 8,2k). And maybe an 18 volt Zener diode instead of a 12 volt. I did not ry this before, but it should work. The electrolytic capacitor does the timing...so you have to adjust the value to your deeds. It shold be rated for at least 25 Volts...the higer, the better..

Hello im building this circuit now and i am wondering what operating voltage the LED is, most i have found on fleabay are about 3 volts. This seems low.

@LariFariYoutube

9 ай бұрын

It depends on the forward voltage of the LED. Gree LEDs have forward voltage of about 2,5 Volt, red 2 volt, blue and white 3 Volts. Choose the right value of resistor for the LED. There are online calculators on the internet, if you dont want to do the math by yourself... I personally always "underrun" my LEDs. This gives them a longer life and in most applications, they need to be super bright... In this case, it is just an indicator LED.

@user-sp5vb1sy8u

9 ай бұрын

@@LariFariKZread Amazing, thank you for the clear explanation.

Sir can you please design a soft start circuit that is always on. Has a DC input, and the moment it senses a load connected to the output, the circuit soft starts itself. And then the moment the load is removed, the soft start circuit automatically resets itself. Trying to make a circuit similar to a magsafe charger, which outputs around 4-5v Dc when not connected to the macbook, and the moment it senses the load is connected(the charger is plugged to the mac), it starts sending a full output voltage of 18 volts.

@LariFariYoutube

2 жыл бұрын

Voltage and current? I will see, what i can do for you.. ;)

@anirudhkundu3567

2 жыл бұрын

@@LariFariKZread max voltage 24 volts. Current 6 amps max. What i am looking for is a kind of circuit that outputs around 5 volts normally. The moment it senses a load is connected, it switches the voltage from 5 volts to 19 volts ( or the main source DC voltage). And then the circuit resets immediately after the load is removed). Basically trying to remake the magsafe charging system. Thanks for your reply Sir.

Ciao e complimenti per i circuito. Credi sia possibile renderlo reversibile? Che sia indifferente l’entrata del positivo e del negativo

@LariFariYoutube

Жыл бұрын

Yes, add a "relais H - Bridge" to the output side of the circuit (to the Motor / load wires)...Thats the easiest way, to reverse the Motor.

@g4vrv

Жыл бұрын

@@LariFariKZread grazie per la risposta. Se voglio aumentare gli ampere, farlo a 50A devo mettere 5xIRFZ44 ?

@LariFariYoutube

Жыл бұрын

@@g4vrv Yes, you can connect 5 Mosfets in paralell to get a higher current rate. But i would recommend to use 8 irfz 44N for the 50 A load.And mount them on a big heat sink.

@g4vrv

Жыл бұрын

@@LariFariKZread ottimo. Io ho già acquistato tempo fa un kit “AR163 Soft Start” su Amazon. ma questo kit ha solo un IRFZ44N, posso collegare ugualmente su questo 8 IRFZ44N in parallelo? Ovviamente li metterei su una scheda a parte con un grande dissipatore come da te suggerito

@LariFariYoutube

Жыл бұрын

@@g4vrv Yes you can "upgrade" your circuit.. No problem..

Max volt and ampere?

@LariFariYoutube

2 жыл бұрын

You can use the circuit with virtually any N channel mosfet of your choice...Or 2 and more mosfets in paralell.. The type of Mosfet sets the current and voltage limit.

Dont know what i did wrong but it doesnt eork

@LariFariYoutube

5 ай бұрын

Do you have some experience with electronics? Do you understand the function principle ? Does your motor run, when it is hooked up to the circuit?

@danguglielmo9147

5 ай бұрын

Yes i am an electrician tinkerer no formal training though. 12v 2000ma motor (per specs on amazon) GM25-370 Output rate: 150 + 10% for RPM Rated voltage: 12V Rated current: 2000mA I got your design to work with 3 470uf caps in series between gate an sourcw 1m at gate after switch 4.7m between gate and source. Only problem now is its taking 30 sec to even start And 20 sec to discharge caps So figure if i reduce the gate R more and the drain R more it should give me what i want. (Start at 2 sec. Ramp for 5-6 sec discharge in 1 sec or less) Using it on a relay board that is controlling 2 motors for tracks on robot. Ive heardmany times PWM but yet to find one that would do what im looking to do. I am not familiar with those circuit design softwares so trial and error. Your design is similar to other fet soft starts ive tried but prefer sw on power and the led so workin with yours till i get it. Thanks for reply if you have a different suggestion im all ears.