... Any updates? I finished a prototype HF/HV starter, but haven't tried it on the torch yet. Arcs maybe 1/8"? I think with some tuning it can get longer. Also...
... source ... there is ... try to ... tried ... can ... Ah, sorry, no she didn't have any other comments. She hasn't actually used the TL494 before....
After realizing just how little real power you can get out of a non-pfc SMPS (~.6 pf for other plasma cutters), we should really look at PFC (like yellow73bb...
... Finished the PFC section and uploaded it to the files. PWM will come next. The design is for 120/240 selectable input, with 110 20 amp output. Switching...
PFC is a good idea, and relatively simple to implement. I did a quick calculation, and it looks like around 16,000 each assuming 30A at 160V or 4800 Watts....
... Igor Chudov (he built an inverter stage for his welder http://igor.chudov.com/projects/Homemade-TIG-DC-to-AC-Inverter/) reminded me that I needed to run a...
... I can only share my experience here. I have a 220V, 60A circuit to my garage. I put it in by myself. I regret tremendously that I did not spend a...
I have a little bad news about the supplier for the magnetics (tsc international). It seems the tooling for the torroid needed is not finished, and won't be...
Assuming the 102-57-25 U core is what we're going with; Material is 50ALL (low core loss at 50kHz, saturation .4T at 100C) Peak Flux Density is .1T Np=53 turns...
I would say to up the wire size - you may not be able to reduce copper loss to ~3w but a good rule of thumb is to divide the total loss between copper and...
Let's try two ways: reducing turns until magnetic loss~=winding losses and increasing diameter of wire Aiming for B=.15T Np=35 turns Ns=25 turns Rp=.14 ohms ...
Argh! I knew there was something wrong with my calculations. I used primary average current for the losses, when I should use "on" current times duty cycle. So...
try www.planetengineer.com for wire You can also wire multiple strands of a smaller wire to get the same cross section. For the bobbin, you need to use a...
Uploaded some simple code to create a 45 duty cycle 50khz signal for testing the gate driver (in code folder). I'm working on making a PCB layout for an...
Hi all, I have a Miller Syncrowave 200 AC/DC TIG welder. Is it possible to use this as a plasma cutter if I get a plasma torch that would plug into it ??? ...
... You would need to set the welder on 50/50 balanced AC, max current, no HF, and build a capacitor voltage doubler. It looks like your welder can output 60v...
From the sound of it, it looks like I'd be better starting from scratch than trying to rig my welder to be able to do both. Thanks for the info. Keith ... ...
Sorry for such a long time since the last post, but I have been working on the prototype. I etched a PCB for the mosfet board, but the large amount of copper...
If you are having trouble with speed, warm the echant and brush the board lightly with a clean chip/paint brush to expose clean copper. Also, drop a copper...
I've begun construction on your plasma cutter . A few questions if I may; What is the zener voltage on your timer circuit (pg2) You mentioned an upgrade for...
Hey Guys, While perusing Ebay yesterday, I came across several low cost plasma cutters that are from China (I think). A couple brand names are Mitec and...
... The zener isn't critical, just sets the delay. I think I used 12.6V. For the nichrome replacement, I'm currently using a large fluid heater resistor now....
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