Mosfet Slayer Exciter Part 1
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- Опубліковано 8 лип 2024
- Hello y'all, this is a followup to the BJT slayer exciter circuit. This circuit runs on a MOSFET, and puts out a lot more power. Thanks for watching and hit that subscribe button!
All diagrams, circuits and more available at platinumboi.wixsite.com/cite/...
Disclaimer. High voltage and RF involved, act accordingly, don't blame me for injuries sustained from circuit. - Наука та технологія
Hey thanks for posting this! I followed your schematic (with some substitutions) and it works great!
Barely any heating in the mosfet, too.
Barely any heating? I am impressed, usually these types of driverless circuits are quite inefficient, sure they are better in terms of efficiency than bjt designs but there is much improvements that can be made, you should try out the schematic from part two. Or better yet build either a bridge/push pull schematic using several fets or transistors for that matter, works like a charm, Ill eventually make a video on it, right now uni sucks up all my free time :D. Glad it worked though!
Well, the mosfet (infineon 07N60C3) has a low R_DS_on at 0.54Ω, and it's FAST, so that helps. I also swapped R1 for 40Ω and VR1 for 10K, and the zener is 6.5V.
It shoots about 2.5cm long streamers at 24V and even at that voltage the heatsink is just decoration. So, great work mosfet-optimising the venerable Slayer Exciter, and thanks again for posting it with a readable schematic!
@@TinkerTom Nice! 2.5 cm breakout to air or to an object by the way? I doubt the internal resistance of the mosfet plays a significant role here because the mosfet is not driven by the circuit in the digital modes but rather the mosfet is close to hysteresis, which is great for having a stable oscillator but can lead to tremendous heating of the mosfet as the current voltage characteristics of the mosfet will emulate a higher value resistor than the Rds value (another problem of this circuit). What could however be of help is the gate capacitance as that could theorhetically leed to a more efficient coupling at the cost of more heating. What coils are you using btw?
Open-air streamers don't shot longer than about 1.7 - 2 cm, but they're very fluffy. It arcs to objects 2.5cm away. My primary coil is 5 turns, 1.5cm tall 6cm diameter. Secondary is approx 500turns 36awg (80Ω dc), 4cm diameter, 23cm long. And to be honest, mosfet physics go a bit over my head. I think I might have just won the silicon lottery with this one.¯\_(ツ)_/¯ it works
@@TinkerTom I guess the streamer lenght is simply a factor of how much juice you give the coil as well as what exactly consitutes a streamer, but yes they do tend to be under 2 cm for lower power systems. What frequency does your circuit operate at and are you using a topload? Seems very similar to the secondary I used, but a bit larger. As for the silicon lottery quite possibly :D ! The funny thing in this circuit is that the mosfet physics are actually rather straightforward for the most part.
Great video! Thanks Ivan!
Thank you for your kind words :) The schematic in this one could use some serious improvements, see the later uploads, if you tweak the diode arrangement you can get maybe 1.5 to 2x more output at the same input power due to a more spectrally dense driving waveform and the circuit running as a switch and not an amplifier.
Hi. I managed to kill few mosfets but it worked well in the end.
What are the size, gauge, and winds of your primary and secondary coils?
my secondary coil consists of 110 meters of 0.2mm wire wound around a 40mm acrylic tube, while my primary coil consists of 4.5 turns of 0.7mm multistrand wire wound around a 5cm PVC tube.
@@ivanrodionov9724 Translation:About 32AWG secondary and 21AWG primary
@@tf3confirmedbuthv54 I guess your right lol
I made a pancake slayer exciter according plasma channel and used this schematic with a MOSfet(irf510) and it works fine and even works better than a transistor but unfortunely the secondary winding has broke down...too thin wires.
Hey! I'm glad the schematic works well for you! It has a few major problems though. I recommend you use a modified version of this schematic where you instead use a fixed gate voltage and clamp it with two shottkies and a low ESR source is used for the gate bias such as a LiPo. You get a more square waveform and thus higher efficiency as well as a more stable and modulatable circuit. I made a video testing the circuit last week but still have to upload the video with the schematic analysis.
Hello, What is the purpose of R1 on the circuit?
Great question. R1 is there to reduce the RC time constant of the mosfet and make the switching more elegant reducing current spikes and preventing undesired secondary oscillations. You can try with and without it to see how the circuit will behave. Alternatively, you could consider using a (very small) ferrite bead as is done in SMPS modules.
MOSFET no?
yup.
How to lower its resonance frequency
What exactly do you mean by lowering the resonance frequency? The operating frequency of the circuit, the resonance frequency of the primary or secondary coil? I will assume you mean lower the resonance frequency of the secondary coil. The simplest way to do this is to wind some more wire on it, no seriously larger coil means lower resonance frequency ceteris paribus, or you could stack a few cans on top of it.
To lower the resonance frequency increase the capacitance, I.e larger top load or toroid capacitor. Or increase the number of windings on your secondary. Larger inductor or capacitor means lower resonance frequenxy
@@ivanrodionov9724 thnx man
@@tf3confirmedbuthv54 i see you everywhere lol
Juntendo lmao