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From: Taylor Alexander <tlalexan...@gmail.com>
Date: Mon, 16 Apr 2012 15:24:13 -0700
Local: Mon, Apr 16 2012 6:24 pm
Subject: Re: Heated bed PCBs
On Mon, Apr 16, 2012 at 2:58 PM, Jelle Boomstra <je...@protospace.nl> wrote: Eek, yeah that wouldn't do. I'll have to put a scope on things for sure. > Afaik, Arduino's 'analog out' is actually about 400Hz pwm, but it might > be that they have corrected that to something sane since. So yes, you would > need a very big cap to smooth that out. I'm not too sure if they use > standard arduino analog out or have written a faster replacement. > The heater won't be a problem because of the heat capacity in the head, it run on the Ultimaker at 19v or 24v with PWM at some fraction of 100% to limit current draw. That would depend on PWM frequency, board inductance (which I was hoping would be enough but someone said would probably be nil) and any capacitance added to the system. But I don't think anyone was worried about temperature changing in 2.5 milliseconds. > On Sat, Apr 14, 2012 at 1:05 AM, Joel Chia <j...@revivalstudios.com> wrote: >> Just curious, running the ultimaker at 24v, wouldn't that adversely >> Also, not sure if it's a design choice or due to board size, but having >> In my experience, aluminium beds can warp and become uneven (infact, >> Cheers, >> On Sat, Apr 14, 2012 at 8:05 AM, Taylor Alexander <tlalexan...@gmail.com>wrote: >>> Yeah I assume its in the kHz range. I definitely don't know much about >>> I do have a scope so I'll check it out both on the input voltage and on >>> On Fri, Apr 13, 2012 at 2:58 PM, Boman33 <Boma...@vinland.com> wrote: >>>> I do not know the switching frequency of the Arduino PWM circuit and it >>>> Modern switching regulators now run around the MHz range. At that >>>> If you have an oscilloscope at home, please let us know what you see in >>>> Have a great weekend! >>>> Bertho >>>> ============================================ >>>> *From:* Taylor Alexander *Sent:* Friday, April 13, 2012 15:52 >>>> If its true pwm then my thinking is that the inductance of the traces >>>> As far as voltage drop - my power supply voltage will not drop. I have >>>> On Apr 13, 2012 6:46 AM, "Boman33" <Boma...@vinland.com> wrote: >>>> The capacitor has to be VERY large to average out low frequency >>>> As you wrote earlier, no perfect solutions but your higher resistance >>>> Bertho >>>> ======================================== >>>> *From:* Bernhard Kubicek *Sent:* Friday, April 13, 2012 09:12 >>>> On Fri, Apr 13, 2012 at 3:06 PM, Boman33 <Boma...@vinland.com> wrote: >>>> I am not sure if it is a good idea to run the 12V heater PCB off a 24V >>>> ========================================== >>>> Thats also not entirely true, I think. If the PWM frequency is large >>>> There are also forums, which are the official gathering place for >>>> If you still want to post to this group, send email to >>>> For information about the Ultimaker, visit: http://Ultimaker.com >>> -- >>> There are also forums, which are the official gathering place for >>> If you still want to post to this group, send email to >>> For information about the Ultimaker, visit: http://Ultimaker.com >> -- >> There are also forums, which are the official gathering place for >> If you still want to post to this group, send email to >> For information about the Ultimaker, visit: http://Ultimaker.com > -- > ProtoSpace | FabLab Utrecht > *Make your vision come to life! * > -- > There are also forums, which are the official gathering place for > If you still want to post to this group, send email to > For information about the Ultimaker, visit: http://Ultimaker.com You must Sign in before you can post messages.
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