Brilliant! Let me get my soldering iron and be done with that blown regulator. I was about to buy another Mega. Thank you so very much for sharing this mod with us!
I really like this solution, however, I have decided to just use a buck converter and still cut the diode on the ramps board. This is also because I use a raspberry pi with the ramps board and the pi also needs 5v and more amps. The buck converter will provide everything I need, and now thanks to your guide I know exactly how to circumvent the voltage regulator and just send 5v directly to the Mega.
when i connected my homemade regulator to my arduino (power transistor and zener with some resistors) my arduino did in fact blew up but not as i thought it would, because the only thing that fried was the serial converter chip, which after replacing made arduino 100% working again, later i put 7005 on a radiator and soldered it to the regulator pins although i was using 15V power suply which died soon after but yeah i never understood why people removing the diode and not deal with power regulator itself, might be a bygone from using 5v standby rail of the pc power suply as a 5v suply but in 24v you often don't have that and need another stepdown converter
thanks for showing this, I have a couple of cheap ramps / mega boards that the regulators have popped because of the reprap full graphics controller draws more than the regulators can handle on the cheap boards, - by coincidence I bought 10x L7805CVs which arrived today and browsing over the spec sheet they appear to have a max voltage of 35v so naturally I suspected I wont need 2 different power sources if running the ramps @24v but I wasnt sure how the mega would behave backfeeding 24v from the ramps to it so can I ask have you run this mod at 24v?
Oof wasting so much power feels bad tho :/ that thing will get toastyyyy these days switching ICs are so cheap and amazing and barely need any components. Wish they’d use those :s some have integrated inductors even!
I did it and worked great except for the lcd screen, when using a 12v or less power suply it work without any problem, but when using the 24v power suply the screen just show rare characters or just don't show a thing. Could you help me with this problem? thanks for the video.
So if i remove fuses or replace them with the bigger one (24V 12A/15A), i can use power supply with that max current without problem and another conversion?
just see if components on ramps takes that, some has 16v capacitors... and fusistor... Then cut the diode on ramps so it will not power arduino with more than 12v and voilla,,,, You have a 24v printer!!!
I connect the VR 7805 as you show but still my computer can't detect it (says USB not recognize) on the board to light R17 and R18 and RX blink one time only at start then nothing (don't know what does it mean) is My Mega 2560 gone Thank you
Take the 7805 and hook the board to the USB, if it works (from the 5V from the USB), there is something wrong with the 7805 or the way it was hooked up. If it still doesn't work, the board is faulty.
Brilliant! Let me get my soldering iron and be done with that blown regulator. I was about to buy another Mega. Thank you so very much for sharing this mod with us!
You are a genius, changing the voltage regulator is so easy i always did it the hard way thanks man
Great idea! Thanks for sharing... I did the same with plates and it has quick saved me!!! Thanks a lot! Greatings from South Brazil!
This makes a whole lot more sense. Thanks for sharing.
I really like this solution, however, I have decided to just use a buck converter and still cut the diode on the ramps board. This is also because I use a raspberry pi with the ramps board and the pi also needs 5v and more amps. The buck converter will provide everything I need, and now thanks to your guide I know exactly how to circumvent the voltage regulator and just send 5v directly to the Mega.
when i connected my homemade regulator to my arduino (power transistor and zener with some resistors) my arduino did in fact blew up but not as i thought it would, because the only thing that fried was the serial converter chip, which after replacing made arduino 100% working again,
later i put 7005 on a radiator and soldered it to the regulator pins although i was using 15V power suply which died soon after
but yeah i never understood why people removing the diode and not deal with power regulator itself, might be a bygone from using 5v standby rail of the pc power suply as a 5v suply but in 24v you often don't have that and need another stepdown converter
Thank You for this nice mod. Juergen from Germany
thanks for showing this, I have a couple of cheap ramps / mega boards that the regulators have popped because of the reprap full graphics controller draws more than the regulators can handle on the cheap boards, - by coincidence I bought 10x L7805CVs which arrived today and browsing over the spec sheet they appear to have a max voltage of 35v so naturally I suspected I wont need 2 different power sources if running the ramps @24v but I wasnt sure how the mega would behave backfeeding 24v from the ramps to it so can I ask have you run this mod at 24v?
I meanwhile exchanged the 7805 tot a 2.5A step down converter, to allow multiple screens.
Very good idea - like!
Thanks its very usefull
I will try it, Thank you and can you please inform me if I still have to use 1N4148 diod to connect the sensor to the ramp 1.4
Do you think it would be okay to cut _Vin_ pin of Ramps and feed mega from 5V?
Leuke video
The heat of the regulator won't burn the pcb?? I think this may work but the heatsink thighten to the pcb is not a good idea
Oof wasting so much power feels bad tho :/ that thing will get toastyyyy these days switching ICs are so cheap and amazing and barely need any components. Wish they’d use those :s some have integrated inductors even!
I did it and worked great except for the lcd screen, when using a 12v or less power suply it work without any problem, but when using the 24v power suply the screen just show rare characters or just don't show a thing. Could you help me with this problem? thanks for the video.
So if i remove fuses or replace them with the bigger one (24V 12A/15A), i can use power supply with that max current without problem and another conversion?
just see if components on ramps takes that, some has 16v capacitors... and fusistor... Then cut the diode on ramps so it will not power arduino with more than 12v and voilla,,,, You have a 24v printer!!!
I tried this exact setup and it didn't work.
why not use a switching buck converter?
You just can’t drop it need. A switch I buck converter needs different resistors capacities and not to mention inductors.
Didn't work. Would not power up the ramps or arduino. Just made the chip hot.
I connect the VR 7805 as you show but still my computer can't detect it (says USB not recognize) on the board to light R17 and R18 and RX blink one time only at start
then nothing (don't know what does it mean) is My Mega 2560 gone Thank you
Take the 7805 and hook the board to the USB, if it works (from the 5V from the USB), there is something wrong with the 7805 or the way it was hooked up. If it still doesn't work, the board is faulty.