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MicroBlocks Guru


Joined: 12 May 2012 Location: Thailand
Online Status: Offline Posts: 2120
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Posted: 07 January 2018 at 2:50pm | IP Logged
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Look for 'heater cartridge' on ebay. They are cheap and work very well. They are used in 3d printers to control the temperature of the nozzle.
__________________ Microblocks. Build with logic.
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Azure Senior Member


Joined: 09 November 2017 Location: Australia
Online Status: Offline Posts: 242
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Posted: 07 January 2018 at 3:10pm | IP Logged
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Just to throw more options into the mix, there is always the good old heater elements, you get those convection hotplates very cheap these days, maybe not cheap enough for what you are thinking of.
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Grogster Guru


Joined: 31 December 2012 Location: New Zealand
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Posted: 07 January 2018 at 3:15pm | IP Logged
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Owwwwwwwwwwwww!!! Check this thing out!!!
Full size heating pad, complete with NTC sensor. This is the current front-runner. 
__________________ Smoke makes things work. When the smoke gets out, it stops!
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MicroBlocks Guru


Joined: 12 May 2012 Location: Thailand
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Posted: 07 January 2018 at 3:24pm | IP Logged
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I have a few of those pads and they work good although i have the 220v ones. The higher the voltage the more wire the less current -> better distribution of heat.
A 12v one would need about 12A current. A 220v version not even 1A.
__________________ Microblocks. Build with logic.
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Grogster Guru


Joined: 31 December 2012 Location: New Zealand
Online Status: Offline Posts: 5618
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Posted: 07 January 2018 at 3:40pm | IP Logged
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There is a 24v version for about three bucks extra, and that would probably be the one I would go for, as I need this thing to be portable. A couple of 12v gell-cell batteries in series would supply the 24v, and 6A or so is managable when it not 100% duty cycle. A switchmode PSU can be built-in to charge the batteries as well as supply it when cold for initial heat-up.
Thanks MB - I had never considered 3D printing parts before you mentioned 'Cartridge heater'.....
__________________ Smoke makes things work. When the smoke gets out, it stops!
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Warpspeed Guru

Joined: 09 August 2007 Location: Australia
Online Status: Offline Posts: 1528
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Posted: 07 January 2018 at 4:53pm | IP Logged
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That certainly looks like a very nice solution. Well done !
__________________ Cheers, Tony.
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palcal Guru


Joined: 12 October 2011 Location: Australia
Online Status: Offline Posts: 953
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Posted: 07 January 2018 at 5:21pm | IP Logged
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What are you using for a thermostat. These are my favourite thermostat
Paul.
__________________ "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"
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Grogster Guru


Joined: 31 December 2012 Location: New Zealand
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Posted: 07 January 2018 at 5:24pm | IP Logged
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The pad has an inbuilt NTC thermistor, and you use THAT to regulate the plate temperature, by reading it with a MM or other MCU. 
__________________ Smoke makes things work. When the smoke gets out, it stops!
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palcal Guru


Joined: 12 October 2011 Location: Australia
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Posted: 07 January 2018 at 5:43pm | IP Logged
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NEAT Paul.
Edit. Out of interest what eggs are you hatching.
Edited by palcal on 07 January 2018 at 6:30pm
__________________ "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"
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GoodToGo! Senior Member


Joined: 23 April 2017 Location: Australia
Online Status: Offline Posts: 151
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Posted: 07 January 2018 at 7:03pm | IP Logged
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I find a frypan full of water delicately heated by a gas burner brings out eggs just nicely.........
GTG!
__________________ ...... Don't worry mate, it'll be GoodToGo!
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Phil23 Guru

Joined: 27 March 2016 Location: Australia
Online Status: Offline Posts: 1375
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Posted: 07 January 2018 at 8:13pm | IP Logged
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palcal wrote:
Out of interest what eggs are you hatching. |
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Shhhh,
They are probably Dragons....
Destined for the next GOT Series.
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CaptainBoing Guru


Joined: 07 September 2016 Location: United Kingdom
Online Status: Offline Posts: 476
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Posted: 07 January 2018 at 9:21pm | IP Logged
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I'm going a different way...
a few of these - 12V 1Amp they easily get too hot to touch with no heatsink (your plate), monitor the temperature and PWM them really easily.
Two plus points: 1. visual indication it is working 2. would look really cool
my 2p
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