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Messages - the_anomaly
1
« on: February 28, 2024, 10:09:57 PM »
Thank you Dave!! I don't work with op-amps often and I neglected to think about bias current. I noticed the AD8029 has a relatively large input bias current. I suppose one option is to pick something with a much lower input bias and I see there are many options on Digikey. I also found this resource: https://www.analog.com/media/en/training-seminars/tutorials/MT-038.pdf. Following the advice in figure 3, I added a 9090 ohm resistor in series with my offset supply (connected to the positive input) and this worked! Output is nicely centered around 1VDC. Thanks again!
2
« on: February 28, 2024, 02:15:56 PM »
Hi all, I'm missing something, probably basic, about using op-amps to amplify offset signals. If you are not familiar with LTspice, the op-amp is powered by a 10V source. The input signal is a 50mV sine wave that is offset by 1V DC. I have a second source holding the + input at 1VDC as well. R2/R1 should give 10x multiplication (which it does). I was expecting the output to center around 1V, going up to 1.5V and down to 0.5V. Instead, it centers around 0.75V. What am I missing here? Thanks! ** apologies the blue input signal looks very faint. If you right click and open the image in a new tab, it might show better. My image got compressed a little on upload.
3
« on: July 25, 2023, 07:42:24 PM »
The friend promised you customers/sales and loaned you money... He should not expect repayment of the loan if the conditions are not met.
Probably easier to make money on less niche type electronics. How about data logging type equipment? DIY kits for e-bikes/scooters? Grow lamps for small hobby green houses? Something that has a larger market and not as difficult to produce.
4
« on: May 15, 2023, 11:53:51 PM »
Klugesmith those are some good suggestions I have been turning them over in my head. I should have given some more details in the original post. I found these papers https://wp.icmm.csic.es/wp-content/uploads/sites/32/2015/06/JPCL2010.pdf and https://pubs.aip.org/aip/apl/article/96/14/143110/986587/Nanopatterning-of-carbonaceous-structures-by-field. They describe breaking down CO2 into carbon and oxygen using electricity at the nanometer scale. I didn't quite follow why they chose an atomic force microscope to deliver the field; I think these microscopes might have very fine control of distance from probe tip to surface? Anyway it got me thinking about what is the dielectric strength of CO2 in gaseous, liquid, and supercritical forms. I've seen some values given for standard room temp and pressure but what about at 100, 200, 500 psi? From looking at Paschen curves, I believe at high pressures it will continue to increase. In the papers, they achieve dissociation at 40V / nm. I won't achieve that spacing with my setup but reaching 25 um (0.001") or less is not unreasonable. My plan is to apply high voltages to different electrode surfaces, flat, pointy, half sphere and measure the breakdown voltage and see if I do get any dissociation into C + O2 or possibly CO + O. I was even thinking of adding some catalysts. So my needs are: 1. A chamber that can withstand pressures up to 1200 psi. More is better but this seemed like a good starting point. 2. A Way to insulate the electrodes. At 0.0001" or 1/10 of a thou I need just over 101 kV to meet the 40V / nm. 3. See through, at least a window. For part 3, I fill my chamber from a 5lb tank. I use a heat exchanger (SS tube through ICE) to liquify the high pressure gas. Being able to see the liquid has been helpful. I have not found high voltage feed throughs capable of these voltages or maybe they exist but are out of my budget. For the picture of my existing chamber, the ID is 1.250" and each plate of acrylic is 1" thick. I measured the deflection at 740 psi and I got 0.004". My concern has been what davekni first said, the borosilicate would shatter before it deflected that far. I suppose there could be two chambers, one the glass tube is in that I pressurize to keep the differential pressure between inside of tube and outside to a minimum. This would be a more complex design. I found Schott makes a heavy wall glass product capable of 600 psi https://www.schott.com/en-us/products/tubular-gage-glass-p1000375/product-variants?tab=heavy-wall. And I was wondering if I made a mold and melted glass into it, if I could make a very thick wall glass chamber. No My interest in using glass is I came across a source saying that supercritical CO2 will diffuse through acrylic and possibly chemically damage it. So my measurements of breakdown may not be accurate. I have not found any information about borosilicate. I know borosilicate is typically very chemically resistant so I was hoping it would hold up here. If this gets too complex I might stop but its been on my mind for a while and I wanted to give it a shot.
5
« on: May 14, 2023, 07:02:16 PM »
Hello all, I've seen a few videos on Youtube of liquid CO2 in high pressure clear chambers https://www.youtube.com/watch?v=-gCTKteN5Y4. I'm interested in performing some experiments on liquid/supercritical CO2 and decided to build one myself out of acrylic: It's in a box with a half inch polycarbonate door. Just in case it ruptured, I wanted to be protected. Later on, I learned supercritical CO2 might have a detrimental impact on acrylic. So now I'm thinking of building one using borosilicate glass as the chamber material. Since the thickest wall I was able to find is 4mm, I'd like to fit the glass tube into a larger acrylic tube. The acrylic tube provides wall thickness to keep the glass from rupturing. The glass/SS electrodes isolate the CO2. A simple model is shown here: My question is, do you think it would be better to have the glass tube (barely) press fit into the acrylic or should I bore the acrylic out to maybe 0.030 - 0.050" larger than the glass tube diameter and fill that interstitial space with a clear epoxy? My concern is I can only slightly press fit the glass tube into the acrylic - I know it won't tolerate much of an interference fit. With epoxy, I can make sure there is solid material between acrylic and glass but it would be a lot more effort to fabricate. I also have not looked at epoxies yet to see if there are any clear ones with high compressive strengths.
6
« on: May 12, 2023, 02:33:09 PM »
If you like power, I see substation design jobs somewhat regularly (design is more based on standards and historical reasons). Solar design with semiconductor converters as well as EV drivetrain electronics also involves power in a very technical way (more creative with less standards to follow). Either could be a good fit.
IMO microcontrollers/processors are hot and I constantly see employers asking for Arm Cortex experience. I also see some FPGA stuff with Verilog and VHDL. Arduino is a buzzword; the processors (Atmel) are great but I don't think the ecosystem teaches the important finer skills in microcontrollers. If you chose Atmel, program with standard MPLAB X. For Microchip, I recommend learning the PIC16F15243. Its a newer generation 8-bit and has minimal errata. The newer gen microchips have better datasheets. The older gen stuff can be a cluster *&^%.
Building projects and having a small website to show prospective employers can be helpful. I showed up to an interview with working electronics (driving a character LCD) and I got the job.
I would check those 'rate my professor' type websites. See who is teaching what courses and who the students recommend - don't pick someone because they are easy. Pick courses taught by professors who teach well. Theory is necessary and hands on should occur when possible. Technical courses can be challenging. If you really want to learn, 2-3 per semester if you can (with the rest being gen-eds). 4 might be a bit heavy of a course load.
Spend some time looking at job boards and see what employers want right out of school and with a few years experience.
I'm quite interested to see what others here think.
8
« on: March 04, 2023, 12:57:53 AM »
I realize this is an old thread but wanted to throw in my 2c. I've done a lot of vacuum work mostly in 10-100mTorr but also in <10^-5 Torr using turbo molecular pumps. So, 0,3 pascals are achievable with a 2 stage pump? Same as above, a good quality name brand (pfieffer, leybold, savant, alcatel, trivac, etc.) All the used pumps I've bought off ebay vary from 2Pa to 13Pa even though their ultimate pressure is listed as less. I have not had good success replacing the vanes either. Leybold tech support told me its difficult to rebuild the pumps, usually need to grind the housings etc. Still 2-13Pa is plenty for experimenting with electrical plasma. I've found that using push to connect tube fittings can work well for electrodes/tubes when you drill the stop out. Easy job if you have a lathe or even a mill. If not, careful use of a drill can get the job done. An example of a setup is shown here: At higher pressure: At lower pressure: Honestly my cellphone can barely capture the beauty of the striations. I'm using pure CO2 in a flow through regime. Also, you can use teflon tape for moderate pressures but I've also found that superglue and various versions of Loctite work well for thread sealants. Here is another useful document on level of vacuum: Vacuum Conversion Table.pdfYou see at the millitorr range how close you are to ultimate vacuum.
9
« on: March 31, 2022, 03:47:56 PM »
Do you know if the original manufacturer sold any accessories that would produce a standard video signal? I don't. Its a JEOL JSM-840 which I believe is circa ~1986? Reading a paper dated 1996 states that it is not economical to retrofit analog microscopes to become digital ones and the 840 is definitely analog. Now today that might be different but I have not found anything from JEOL. I've done more research since my first post and aftermarket people talk of using 'frame grabbers'. So that might be the path I want to head down. I was thinking convert the raw H/V and brightness A first look at the signals you have would be very helpful I guess. I owe you guys some o-scope screen shots, I'm waiting on longer BNC cables to arrive so I can capture some images. I found this video where the author does exactly what I hope to do: /> Except in his case, he found a composite video signal and as mentioned he was able to use comparators and an ADC to record and send data to a PC. I am still looking through the schematic book to see if I can find something similar. So... the signals come from the detector (?) of the electron microscope itself, into this photo unit? Did I understand it correctly? Yes, the signal comes from the secondary electron detector which is a photomultiplier tube with a aluminum/phosphor filter that converts reflected electrons to light. Apologies for the scan quality. I am waiting on a wand scanner which I hope will produce better than my phone. [ You are not allowed to view attachments ] Here is a top level view of the connection diagram. The SEI is sending the raw photomultiplier signal (after an internal pre-amp) to the image control unit. [ You are not allowed to view attachments ] Looking at a more detailed connection diagram, you see the image control unit connects to the CRT display unit through NA8/JC2 and NA7/JC7. I picked those two for first interest because they are BNC connections and when looking at the CRT display circuit: [ You are not allowed to view attachments ] (top left) ...they are marked as image1 and image2. I'll post what image 1 signal looks like when I get proper BNC cables. It is a waveform that I did not see any timing in. How fast is the scan speed? 16.7mS / 63.5uS = 263 but since its interlaced x 2 for 526 lines? Long story short, I cannot get any reasonable looking images out of it even at very low magnifications. I was thinking if I could use the longer scan times, this would clean up the image quite a lot. But recently I saw this image of a 'mostly the same' microscope as mine at an auction site: The image displayed on the monitor is far clearer than anything I have been able to obtain. My image is completely filled with shot noise. Past 500X mag. I can only see noise. So, I'm starting to think there is something wrong with the image generation circuit. Now the microscope has an oscilloscope like function where it can show the horizontal sweep waveform. It should look like this: But mine it filled with fuzz. I can see a waveform inside the fuzz but no amount of control/alignment of beam seems to have any impact. So perhaps my digital quest is too early. I'll be able to look at more signals from the SEI detector and so on when my cables order arrives. I appreciate everyone's time looking at this and giving suggestions.
10
« on: March 27, 2022, 03:58:07 PM »
I have a very old JEOL scanning electron microscope. I'm looking for a way to get digital images out of it. Attached is the schematic for the photo unit where you can put film and do a long exposure for a crisp image. The photo unit receives horizontal and vertical coil scan signal (saw tooth waveform I believe) and the brightness and contrast signal. Does anyone know of a plug-and-play style converter unit that could convert these primitive signals into a digital format like VGA/HDMI/Composite video? Or even an IC chip to build a circuit from? Thanks!
11
« on: June 20, 2021, 07:16:17 PM »
Thank you all! My current meter was very cheap and struggled to give consistent values. I went with the DE-5000 in the end but the other options looked just as well.
12
« on: June 17, 2021, 01:58:48 PM »
Does anyone have a recommendation for an LCR meter? Bench or handheld but I slightly prefer bench. Primarily used for measuring inductance in the uH or sub uH range.
13
« on: September 06, 2020, 04:41:32 AM »
I knew you guys would have some good suggestions. Looks like linear motion may not be my greatest challenge. The Piezo linear actuators appear to meet my desired performance and for my budget they are affordable.
If I do not go with a piezo product, thinking about lead screws, for an 80 TPI lead screw each turn traverses 0.0125" or 317,500 nm. If I count in degrees of a revolution that gives about 882 nm per degree. If I further count in minutes of a degree, that would give 14.6 nm per minute.. I would accomplish this using gear reduction (belts/pulleys) counting motor rotation as position feedback. Sounds good in my head at least.
The next issue is slide travel accuracy. If I jog the slide to the end of its travel (1cm or 1"), has it moved off axis more than 50nm.
The 50 nm resolution is negotiable to. I've read that SEM lithography generally has a 10 nm limit of accuracy. I thought, let me back off that level of performance but try stay within the nm range.
I really like the Physikinstruments products, particularly their slide tables. The prices however, the U-723 XY stage is 7k USD.. Their highest precision N-565 linear stage has unidirectional tolerance of +/-50nm. So I know it is possible but for that stage you need to submit a quote so I assume it is out of my budget. They do mention crossed roller bearings for the slide - something to look into.
I've ordered a couple of textbooks on SEM and particle beam physics to learn more, maybe deflection is worth trying.
14
« on: September 05, 2020, 04:29:40 AM »
I want to do some simple shape e-beam lithography. I want to build my own beam writer and I'm thinking that accelerating and focusing an electron beam will be a lot easier if I don't deflect it. Instead of deflection, I want to move the sample table beneath the beam to draw my image. The goal is better than 50nm resolution.
Any thoughts on building such an x-y table? I'm thinking of using friction wheels to move it to avoid backlash of gears.
I am looking at getting an SEM but setting them up for lithography is not simple and I would like a large writing area of >1cm2.
15
« on: December 06, 2019, 03:35:39 AM »
For medical products, IEC standards have creepage and clearance requirements for exposed conductors. They denote line of sight and surface length from conductor to case. This is intended for non insulated connection points like flag terminals. I would expect consumer products have similar standards.
My current toaster oven's manual requested the unit be run for some time until the elements stopped emitting smoke. Burning off some manufacturing lubricant I assume.
16
« on: January 17, 2019, 02:01:36 AM »
Nice video Pete! I am actually not planning to use water cooling, probably 12-14ga solid copper wire. I am hoping that using it only for a minute at a time will be sufficient to get a 7/16" bolt red. Hopefully this will be a short enough duty cycle to keep the coil from melting. If I do need water cooling I was planning to go to the auto store; they usually stock 1/8" copper tube for oil pressure gauges. Since space is tight for my application, I need to use a smaller coil.
Is that a South Bend lathe in the background?
17
« on: January 14, 2019, 01:15:53 PM »
I have also just purchased one, Yosoo 1000W by huhushop on Amazon. Bought it Sunday morning, got it delivered Sunday evening.. man I love Amazon haha. Looks ok except one of the FETs is not fully secured to its heatsink; the screw is only part way threaded in. Also no thermal compound, Mads does your unit have thermal compound on the FETs? As long as I can use it to heat stuck bolts on this outboard engine I am repairing I will be happy. I've been tempted to build Uzzors PLL induction heater http://uzzors2k.4hv.org/index.php?page=pllinductionheater1 but I took this gamble to hopefully save time and money. One thing I've been warned about using ZVS induction heaters is you need a power supply with a fast turn on transient otherwise oscillation may fail to start and resulting in both FETs turning on at the same time. Probably best to connect the power supply to the induction heater through a relay so you can turn on the power supply, let it fill its output filter caps and then activate the relay.
18
« on: December 22, 2018, 01:06:53 PM »
I don't see a current sense resistor on the battery pack so I don't think you will be able to charge them accurately. You need to be able to count the coulombs of charge going into and coming out of the battery to know to keep charging/discharging or not. I have some doubts about this chip TP4056X. Texas Instruments makes a lot of battery management chips like the bq40z50-r2 which would work well for you http://www.ti.com/product/BQ40Z50-R2
19
« on: November 09, 2018, 01:42:06 PM »
Nice equipment! How do you like the Rigol scope? I was going to get one but I heard some mixed reviews.
Did you ever get the solar panels set up?
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alan sailer April 11, 2024, 01:44:32 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 11, 2024, 01:31:40 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 11, 2024, 01:11:00 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 11, 2024, 12:58:52 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 11, 2024, 12:31:37 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 11, 2024, 12:30:21 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 10, 2024, 11:41:46 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Mads Barnkob April 10, 2024, 11:33:32 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 10, 2024, 10:41:33 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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MRMILSTAR April 10, 2024, 10:31:31 PM
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Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 10, 2024, 09:56:35 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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unrealcrafter2 April 10, 2024, 08:59:26 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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markus April 10, 2024, 06:35:30 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 10, 2024, 05:35:14 PM
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Medium Drsstc question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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unrealcrafter2 April 10, 2024, 03:07:02 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Michelle_ April 10, 2024, 03:42:12 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Michelle_ April 10, 2024, 03:41:04 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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sky-guided April 10, 2024, 02:50:23 AM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Unrealeous April 10, 2024, 01:32:17 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 10, 2024, 01:26:29 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
|
OmGigaTron April 10, 2024, 01:18:35 AM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Mads Barnkob April 09, 2024, 07:34:19 PM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 09, 2024, 06:14:27 PM
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Re: CM400 Induction Heater
[Electronic Circuits]
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markus April 09, 2024, 06:08:53 PM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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markus April 09, 2024, 05:15:19 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Michelle_ April 09, 2024, 05:11:04 PM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Benjamin Lockhart April 09, 2024, 06:32:16 AM
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DRSSTC V1 using BSM150
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Unrealeous April 09, 2024, 04:04:47 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 09, 2024, 03:27:11 AM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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davekni April 09, 2024, 03:25:47 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 09, 2024, 03:01:40 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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sky-guided April 09, 2024, 02:46:46 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 08, 2024, 09:32:57 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 08, 2024, 09:25:11 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 08, 2024, 08:45:15 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 08, 2024, 08:24:13 PM
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Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 08, 2024, 04:02:48 PM
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