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Author: Subject: Building a Heating Element?
Metacelsus
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[*] posted on 7-6-2016 at 14:43


Why do you even need to use DC? Why not AC? Transformers are easier to deal with than DC/DC converters.



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[*] posted on 7-6-2016 at 15:23


Does AC work with kanthal? I tried looking it up, but didn't find much.



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[*] posted on 7-6-2016 at 16:16


Kanthal wont know the difference. AC is much easier. You could then use a variac for power control. Simple, and very robust - which switching supplies are not.



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[*] posted on 10-8-2024 at 23:06


chatgbt sugest me to use silicon carbide as isolation. I checked price and it is very cheap. What do you think guys?



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[*] posted on 13-8-2024 at 10:19


Kanthal is usually insulated with magnesium oxide inside heater elements. I cannot think of a cheaper material. And the kanthal will fail well before the magnesium oxide.
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[*] posted on 13-8-2024 at 11:27


You cant push a 12volt atx power supply up to 60 volt.
First you will need some kind of load on the 5 volt line because the overvoltage protection will cut off(even if you fool the 12volt OVP part with trimmer/pots or zener diodes)
Also, the electrolytic capacitor inside that power supply are not rated for this voltage, so if you manage to get this kind of voltage then it will blow up.

Running 2 smps in series is usually a bad idea(but it do work).

As for calculating wire length and voltage/current, i like to use this calculator
https://jacobs-online.biz/calc2.html
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[*] posted on 13-8-2024 at 13:04


a half wave rectifier with a motor start capacitor will give a 60v output up to about 7 amps assuming 120vac input. Using a high wattage light dimmer or using a regular light dimmer to drive a triac ahead of the rectifier will do fine. Honestly for a heater application you can just use a half wave rectifier and high wattage light dimmer.

You can use an arduino to drive a triac but it requires a few other components.
Search for arduino kiln controller. It will provide a number of hits.

Most SSRs are just a triac with driving circuitry to allow 3 to 24 volt drive.
Look up SSR tear down on you tube.
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[*] posted on 14-8-2024 at 15:09


Quote: Originally posted by macckone  
Kanthal is usually insulated with magnesium oxide inside heater elements. I cannot think of a cheaper material. And the kanthal will fail well before the magnesium oxide.


On another forum I asked about this and one guy replied that I need burnt magnesia to fill the heating element. To get this element I have to heat MgO to 1700-2000*C so I decided to leave it. He suggested me to use talc, water and phosphoric acid to make a paste but after I asked about the proportions he didn't answer so I started looking for another material. Before I ordered SnC I did some good research and it looks promising. Now I have both (SnC and MgO), only one detail is that I use Ni-Cr wire and not Kental so maybe this guy is right about overheating if I would use MgO with nichrome wire. Does anyone can confirm or decline this info's?




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