Limiting inrush current with a soft start relay

[@johnwick1766]

Thanks for these videos. Wish there were a lot more.

[@_dpa3122]

Excellent video driven by a remarquable story board that gives very good explanations. Thanks

[@stephendixon8575]

Wow - this is the very first of your videos I have seen (and certainly will not be the last if they’re anywhere near as good as this). Can I just quickly congratulate you on probably the clearest and best delivered explanation (both the speed and the use of diagrams) I ever come across for an electronics circuit. Simply brilliant - I think anyone with even a modest understanding of the basic principles of component behaviour could follow this and come away with a through understanding of how it works and, best of all, how to modify it for their own needs. Fantastic. Well done 🙌❤️

[@Kurt1968]

I really enjoy your videos. Very well developed and thorough. Looking forward to your next one. Thanks!

[@brim5905]

You deserve more views!

[@jagbusquets]

Excellent explanation.

[@Guishan_Lingyou]

This is a fantastic video, thank you for making it. Extremely clear explanation of a very useful circuit.

[@pazzy4501]

Well done. Very simple yet very effective

[@fabriziolavini7457]

My great appreciation for the estreme clarity about the exposition, showing every detail, taking none for granted. And very clear the voice itself too (often a big issue for a foreigner interpreter as in my case).

[@guilldea]

Everything was very properly explained, what a satisfactory video

[@vloogle4924]

You could use another pole of your relay to connect/disconnect your dissipation across the power connection. This would eliminate the power loss in operation and you could place a smaller resistance when off for quicker dissipation of the cap.

[@111000100101001]

I used your idea to discharge the capacitor more quickly in my welder when the power is switched of. It works much faster and efficiently than having a constant “bleeder” resistor.

[@jgwimmer]

Excellent explanation, it even brushed me up on time Constance and I knew right off the bat the time constant one was 63 percent, I remembered that from school 50 years ago. And I think even at time constant 5 it's only like 97%

[@iyakuz]

Awesome explanation, thank you so much for taking this time to share

[@Tarija3]

Great information and explained like the pro that you are Thank you

[@maksberlec4832]

Excellent video. Thank you!

[@ranger175a2w]

Thanks for the video.

[@cobar5342]

This is a very well presented video.

[@AltereggoLol1]

I like how this is basically pre-charging a capacitor with a pencil lead resistor, but automated lol

[@traditionrider]

Good explanation. At roughly 13 minutes, you provide an analysis of when Q2 is active. It should be Q1.

[@weinihao3632]

Really like your videos! Hope you are doing well!

[@brianreinthaler6749]

Nothing new for 11 months. I hope you're OK.

[@mannys9130]

3 years. I think he's dead.

[@JunayedMahmud-s4s]

Now It's 4 years

[@johangroenewald1752]

I wish I could learn from you from the beginning. You are excellent !!!! This is my second video that I watch and I am completely enslaved by the way you work out things. I have found what I have been looking for After searching for a week or two on the internet. I am glad I have found you .Thank you

[@33samogo]

Fantastic tutorial👌

[@fantasmadosentinel]

Very good, and well explained...😊

[@basabsengupta9661]

fantastic...

[@cdrive5757]

Hawley Hobbies are *Pure Gold Nuggets* buried among a KZbin mountain of Fools (crap electronics) Gold . From start to finish, all HH videos are superior in both tech content as well as exceptionally sharp graphics! How this jewel, posted in June 2020, has received a feeble 82 Likes is perplexing, to say the least! It certainly isn't Hawley's fault. About the only things that should have been discussed thoroughly are ( in this case) Mains Ground vs Circuit Ground. Hopefully we can discuss it here or privately. Wakodahatchee Chris

[@DavidHalko]

I just added another LIKE - pretty amazing! I wish he could do a similar one for 240v A/C conpressor… I can figure it out from here, but high current starts to create all kinds of other interesting problems, that must be addressed!

[@Makatea]

Hi, Jim, I very much enjoy the format of your educational videos going over both the practical aspects as well as how to calculate the values. I very much hope that you'll restart producing your great videos soon. Perhaps do a collaboration with a likeminded channel with a bigger audience to grow yours? Anyway, I subscribed and am being hopeful, there's more to come...

[@montech5647]

A big thumb for this!! 👍

[@WorldOfPPG]

Thank you for sharing. Could this circuit be used for soft starting RV / Camper airconditioner please ?

[@SuperFredAZ]

Make sure to warn your viewers that the line voltage is potentially there to ground since the line is not isolated, this can be dangerous!

[@t1d100]

I have a similar problem with the high inductance of my transformer popping the fuse. I have just discovered a solution similar to yours, and it is even one step simpler... Just use a relay that is driven by Mains VAC... No 15V supply circuitry needed. Meaning, the resistor is placed across the Normally Open connection of the relay switch. When power is applied, the in-rush current is limited to both the transformer and the relay. The resistor is rated (at the least) to be able to provide sufficient voltage to drive the relay (which isn't much.) Once the voltage rises to 80% (for my particular relay) of Mains, the relay engages and takes the resistor out of line. The transformer then charges up to full Mains. But, the largest part of the in-rush current event has been removed. Of course, the relay remains on for the duration of operations. HTH.

[@liuj88]

Can you identify the relay thst you used?

[@alejandrodominguez6963]

EXCELENT

[@tsyondestin5800]

more vids more vids

[@martyboer9740]

I had bought a PSU with Inrush Protection and when i started up my pc i heard a audible click sound, so this might be the answer to my question?.

[@kaybhee6]

if 2A or more needed,,steady state thermistor,,, its temp wll be over 90C.. almost boiling water,, right

[@kaybhee6]

goot

[@ColocasiaCorm]

i wish someone would teach me lt splice, or just do it for me. i'm so sick of learning softawre.

[@kaybhee6]

how hot is relay,,,pls

[@DavidHalko]

Not very hot since very little power is flowing through that relay!

[@alejandrodominguez6963]

REPAIR A PCB WITH RELAY AND NTC

[@michaelbesemer1765]

Nice video, but take off your jewelry when working on energized circuits!

[@morejelloplease]

why can you not buy one of these units complete? there are surge protectors everywhere but no inrush current limiter outlets. code now says you have to have arc fault or combo breakers in a house, every time you turn on a vacuum , blender these stupid breakers trip. if someone like tripp lite, furman, etc made one that i could just plug a device into i wouldnt have this problem. my home stereo has big caps and subs have monster transformers and it trips every other time.