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Metacelsus
International Hazard
Posts: 2537
Registered: 26-12-2012
Location: Boston, MA
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Mood: Double, double, toil and trouble
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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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elementcollector1
International Hazard
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Does AC work with kanthal? I tried looking it up, but didn't find much.
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
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Twospoons
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Location: Middle Earth
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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.
Helicopter: "helico" -> spiral, "pter" -> with wings
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Texium
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Thread Moved
22-11-2023 at 20:20 |
LookingForAnswers
Harmless
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chatgbt sugest me to use silicon carbide as isolation. I checked price and it is very cheap. What do you think guys?
Chemistry Pope
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macckone
Dispenser of practical lab wisdom
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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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fx-991ex
Hazard to Self
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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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macckone
Dispenser of practical lab wisdom
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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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LookingForAnswers
Harmless
Posts: 17
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Location: United Kingdom
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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?
Chemistry Pope
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