Shocking! not really but it's a start :)
Okay, so this is my layout pre-soldier, yes it's messy but go to hell the FET's pins don't fit into the proto-board. I replaced the larger resistor (5kish) with a 10k potentiometer so that it's fully tunable, if i wanted to I could utilize this circuit with just about any transformer that I want a half wave signal out of.
Figuring out why I was burning my MOSFET's wasn't hard to figure out, take a look at the sheer size difference between these two.
Yes, that is a large paper clip holding my FET to a copper heatsink from a computer.
After soldering everything together, having a really bad failure. Round 2 ensues and here's the result:
Like the layout? I sure as hell do because I suck ass at board layout, and I cut the crap out of my fingers drilling through that heatsink to mount the FET.
So here's the final layout before I box everything up, the reason I haven't done so is because I can push more out of this flyback although it's not necessary as this is just a test run to experiment. Right now it runs on 12v, I'm thinking I can push it towards at least 18 - 24 volts, the problem is that I need to solder in a voltage regulator and a snubber to reduce the risk of frying everything that is actually sensitive. Once again, not totally necessary for the final project but still a personal goal to get the best out of a small package.
SUCCESS! I hear a whine from the flyback and FET, voila!
Yeah, yeah it's not really impressive. That picture has it at around 1 - 1.5cm. After I took the pictures I tuned the circuit a little and was easily getting over 2cm (remember, this is ONLY AT 12V!).
That candle in the background? Yeah I lit it with the solid plasma arc (low power arc welder ftw)
Also a few things of note:
1. This is using a cheap ass flyback out of a dell monitor I got at IKEA for 10$.
2. After prolonged use I think the heat got to the FET and reduced it's efficiency enough to actually reduce the arc that was produced, if you're making one of these remember that this isn't exactly the most efficient circuit. That's a lot of power being wasted!
I'll post the circuit I used and some neat upcoming things to play with (new transformers I tore from an OLD television set).
Figuring out why I was burning my MOSFET's wasn't hard to figure out, take a look at the sheer size difference between these two.
Yes, that is a large paper clip holding my FET to a copper heatsink from a computer.
After soldering everything together, having a really bad failure. Round 2 ensues and here's the result:
Like the layout? I sure as hell do because I suck ass at board layout, and I cut the crap out of my fingers drilling through that heatsink to mount the FET.
So here's the final layout before I box everything up, the reason I haven't done so is because I can push more out of this flyback although it's not necessary as this is just a test run to experiment. Right now it runs on 12v, I'm thinking I can push it towards at least 18 - 24 volts, the problem is that I need to solder in a voltage regulator and a snubber to reduce the risk of frying everything that is actually sensitive. Once again, not totally necessary for the final project but still a personal goal to get the best out of a small package.
SUCCESS! I hear a whine from the flyback and FET, voila!
Yeah, yeah it's not really impressive. That picture has it at around 1 - 1.5cm. After I took the pictures I tuned the circuit a little and was easily getting over 2cm (remember, this is ONLY AT 12V!).
That candle in the background? Yeah I lit it with the solid plasma arc (low power arc welder ftw)
Also a few things of note:
1. This is using a cheap ass flyback out of a dell monitor I got at IKEA for 10$.
2. After prolonged use I think the heat got to the FET and reduced it's efficiency enough to actually reduce the arc that was produced, if you're making one of these remember that this isn't exactly the most efficient circuit. That's a lot of power being wasted!
I'll post the circuit I used and some neat upcoming things to play with (new transformers I tore from an OLD television set).
posted by Phreakazoid187 at 9:55 PM
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