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MicroBlocks
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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.
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Azure
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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
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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. 
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MicroBlocks
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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.
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Grogster
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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'.....
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Warpspeed
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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 !
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palcal
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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.
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Grogster
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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. 
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palcal
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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
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GoodToGo!
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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! 
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Phil23
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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
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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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Topic: Electronic heater plate....
