At 4:31 A capacitor across the coil also works. It could be put across the contacts like in an automotive ignition coil (as you stated in another comment).
It is pretty amazing. It's why that kickback surge needs to be taken in to consideration, so it doesn't harm devices that can't handle it. Luckily it's fairly easy to bring under control.
If you're asking whether inductive kickback (magnetic field collapse) can generate much higher voltages than the voltage applied, then yes it works. It's the principle the automotive ignition coil/points system uses to generate 20,000+ volts from 12 volts.
Wanted to make a non sarcastic comment to say what a great tutorial on what not to do! Really makes the need for a fly back diode light up in your face
When you need true isolation in a design a relay might be the answer. Good article here - www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog+Section%7FAutomotive_Relay_Applications%7F0315%7Fpdf%7FEnglish%7FENG_CS_Automotive_Relay_Applications_0315.pdf
At 4:31 A capacitor across the coil also works. It could be put across the contacts like in an automotive ignition coil (as you stated in another comment).
Across the contacts like the old condenser/points method reduces spark erosion of the contacts
@@MoreThanElectronics True but it will suppress the high voltage spike. You can test this with the o'scope.
I was about to ask a question as the video was running but you answered it as I thought about it. Proof that you're psychic.
I knew you were going to do that. 😁
Wow! Never seen a relay with a lifetime rated in seconds before
Yep, could reach that 100,000 lifetime operations pretty quick....
geeze! ud think it would just be 9v. thats amazing.
It is pretty amazing. It's why that kickback surge needs to be taken in to consideration, so it doesn't harm devices that can't handle it. Luckily it's fairly easy to bring under control.
Do you think this works
If you're asking whether inductive kickback (magnetic field collapse) can generate much higher voltages than the voltage applied, then yes it works. It's the principle the automotive ignition coil/points system uses to generate 20,000+ volts from 12 volts.
Wanted to make a non sarcastic comment to say what a great tutorial on what not to do! Really makes the need for a fly back diode light up in your face
When you need true isolation in a design a relay might be the answer. Good article here -
www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog+Section%7FAutomotive_Relay_Applications%7F0315%7Fpdf%7FEnglish%7FENG_CS_Automotive_Relay_Applications_0315.pdf