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Registered Member #1223
Joined: Thu Jan 10 2008, 04:32PM
Location:
Posts: 133
Ok, tubes are 4-250A tetrodes. I think input power is about 1500-2000Watts but i havent measured it. Well mostly I just made this for fun and for experience but indeed, there are many useful applications for this like induction soldering, brazing of small parts and im going to make small curcible for melting some metals like aluminium for casting. I like to construct things out of metal so induction heater is very useful tool..:) Now its time to build impedance matching network(aircore transformer, 12 turn primarycoil and 1 turn secondary out of copper sheet surrounding primarycoil) so that singleturn workcoils can be used. Watercooling is also required for workcoils as there might be over 500Amps of RF current.
Registered Member #1223
Joined: Thu Jan 10 2008, 04:32PM
Location:
Posts: 133
I made some modifications. Bigger powersupply and bigger tank capacitor and some fin tuning for tankcircuit and now there is parallel feeded workcoil. There is new video in my first post to be seen :)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I think you should make some sort of crucible and try melting some steel. (If you haven't yet).
I'd be expecting a lot more than 500amps for a single turn coil :O, you better use some really thick pipe and water cooling - I don't know if that is going to be more practical than a multi turn coil.
Registered Member #1223
Joined: Thu Jan 10 2008, 04:32PM
Location:
Posts: 133
For some complex shaped workpieces, its more easy using just singleturn coils. like, sawtooth hardening work or so. And yes, im going to build watercooling system. Even without matching transformer, workcoil glows orange and tank coil gets really hot in a minute.
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Induction heater, vacuum tube oscillator.
How much current does it draw from the wall socket?
