Suggestions Thread 0 - Page 1
Forum section: electronics / general

author: Teque5
author_rank: Newbie
timestamp: October 14, 2009, 04:47:47 pm
content: Just to start:0. Describe your top 10 workbench tools.1. Be a guest on thehttp://www.theskepticsguide.org/and talk about audiophile cable pseudoscience. They have a large audience that would likely be interested. You would generate a ton of traffic for your vidblog and I think they might be interested.2. Cover some  clever hardware hacks:2.1. How the original GB ROM got dumped by decapping the chip holding it and reading out the values with an Electron Microscope (two thirds down the pge, the post by nevikisti from Wed, 05/18/2005 - 10:26). Thread itself deals with how they tried to dump the SNES DSP1 chip, but ultimately failed to do so. They were still able to dump the ROM though.http://www.cherryroms.com/forums/copier-and-hardware-forum/manually-extracting-rom.html?page=22.2. How to dump the Color GB ROM: Costis was able to dump the elusive boot ROM from the Gameboy Color by using various voltage and clock glitching tricks. The boot ROM is what initializes the Gameboy hardware, displays the 'GAMEBOY' logo and animation, and makes the trademarked 'cling!' sound effect. Even decapping the CPU had failed previously, but now the boot image and specifics on how it was dumped (along with many photos) are available for download. This was just completed and a cool read.http://www.fpgb.org/?page_id=173. More tool reviews!

author: Neilm
author_rank: Super Contributor
timestamp: October 14, 2009, 07:14:30 pm
content: I would like to see a blog on safety of multi-meters. There have been a couple on cheap meters and the reliability (or lack thereof) but neither of these mentioned any safety aspect. During the course of my work, I have seen the results of a cheap meter with a 600V CAT III rating meeting a surge of the correct voltage on a 600V supply. It was the first time I had seen a meter explode...

author: EEVblog
author_rank: Unknown
timestamp: October 14, 2009, 08:39:40 pm
content: Quote from: Neilm on October 14, 2009, 07:14:30 pmThat's on the cards, assuming I can get/build an appropriate HV surge generator. I'm acquiring meters for a "multimeter destruction" episode!Dave.

author: Unknown
author_rank: Unknown
timestamp: October 15, 2009, 12:47:39 pm
content: Hi,I would like to see some blogs on DIY Test Equipment, like the uCurrent, PSU's etc.I was also wondering if it was possible for "Guest" Presenters, have other people submit Vblogs to you for posting (could increase the number of blogs per week with hardly any time needed by Dave)

author: 74HC04
author_rank: Contributor
timestamp: October 15, 2009, 10:18:55 pm
content: QuoteI really like this idea, especially if the content undergoes a little light moderation (only to ensure quality of submissions remains acceptable and relevant). Just my 2p worth but it'd be nice to see the EEV blog become a "one stop" video blog for quality EE videos, perhaps separated from Dave's own content?

author: EEVblog
author_rank: Unknown
timestamp: October 16, 2009, 01:51:35 am
content: Quote from: GeekGirl on October 15, 2009, 12:47:39 pmI've been thinking about this since very early on. It is a "blog" after all, and most blogs usually just link to and comment on other useful stuff on the net. But up until now I've not really been running it like that, as I've just been generating and posting only my own video content. So nothing to stop me posting links to other useful stuff others have done.I'd limit it to videos I think, as this is of course a video blog.What do others think of this? Would it be ok to "pollute" my original content with other submissions?Ideas on the best way to implement this?i.e. I keep my original episodes going as-is, but post other interesting videos or content in between as well?I currently host my videos on my YouTube channel and also a lower res version locally on my server for the benefit of those who watch via iTunes and other players. So if I linked to just an existing YouTube video, these people won't get the benefit of that, they'd have to come to the site and watch the embedded link, or jump to YouTube.I wouldn't like to pollute my Youtube channel with others peoples videos, so any "submissions" would probably have to be already hosted on YouTube or another embeddable player.Feedback please...Dave.

author: Mastro Gippo
author_rank: Regular Contributor
timestamp: October 16, 2009, 06:53:01 am
content: Well, usually if someone wants to do a technical video and publish it he has already his own website/blog. There are other websites devoted to collect people's work from all over the net (hackaday, hacked gadgets, etc) and I strongly prefer an all-Dave blog.It's just my opinion, of course...

author: johnnyk126
author_rank: Newbie
timestamp: October 18, 2009, 06:34:56 am
content: Workbench... Professionals know what they need. They make money on this and they have it to spend on quality stuff because it will pay off.But what beginner can do? Limited budget is a big problem. Limited space and wife unhappy about every new "piece of junk you bought" is even more problematicThere is a lot of possible options to spend money. What equipment is worth buying. What is essential, useful and especially what is piece of useless crap (to get signal generator or not, second/third multimeter or save for scope). What can be easily replaced by DIY bench stuff (like esr meter, power supply, micro current, basic signal generator). Spend money or build yourself? Hunt for older units with (usually) one purpose or hunt for deals like multimeter with frequency measurement, capacitance, inductance (like UNI-T UT70A, about $60-70, probably a lot better than nothing) to replace bulky old stuff with one small unit. Old equipment is usually heavy, so you can spend on shipping big portion of budget and equipment with multiple purposes can save money.Is it possible that by not saving every penny we can get a better stuff? Example? I can buy decent old scope for about $200. But... Or is old, maybe (or soon to be) broken, not too many useful features like automatic measurements, big, heavy (shipping charges). For digital I may need additional logic analyzer, another big box (or maybe small $100 usb unit, but then computer is required, you don't have one on your bench).Or maybe it is better to get new Rigol scope? DS1052E is about $400 right now. One compact unit, warranty, factory tested, new product smell, easy to move, easy to sell if I don't want to do this anymore or I saved for something betterCan digital scope like this be used as some channel limited logic analyzer? Serial buses are very common, so I probably won't need a lot of channels. Amateur without strict design requirement can replace parallel bus part with serial bus one. Rigol has deep memory, but how deep is it really in practical usage (debugging I2C or SPI or IR remote codes)? Is scope with limited sample memory also capable capturing longer digital sequences or only deep memory unit? I can find ton of videos where they connect the probe to calibration output or signal generator, they put sine wave and play with some measurements. Unfortunately nothing helpful in terms of practical equipment usage. I believe that some samples of practical usage will be helpful to choose between different options on limited budget and to know what is useful and when. I can find pictures of amateur workbenches with many combinations of equipment, but do I need stuff they have? Maybe I can get something different. Can something be done simpler, nicer, cheaper or stick to old tested stuff... When I finally get the staff how to use it, how to use it in unusual way.Workbench stuff is importantMention workbench stuff as frequently as scope glitchesYour capacitor tutorial was great. More stuff like that as well. Mention places to get knowledge or project ideas/solutions. Books, datasheets, websites. Some interesting projects to make. Maybe spend few seconds to show some interesting parts, what they do, some common solutions for different applications.

author: KuchateK
author_rank: Regular Contributor
timestamp: October 19, 2009, 08:56:16 pm
content: More oscilloscope stuff and equipment reviews. Show us interesting DIY equipment or useful stuff that is a lot cheaper to build than to buy (like PSU).

author: Teque5
author_rank: Newbie
timestamp: October 20, 2009, 10:49:21 pm
content: Speaking of O-Scope reviews: check this out. An $89 Portable oscope.http://www.seeedstudio.com/depot/beta-testmicro-digital-storage-oscilloscopedso-nano-p-512.htmlUnfortunately it only has 1Mhz analog bandwidth. Still cool though.Specs:SpecificationDisplay 2.8? Color TFT LCDDisplay Resolution 320×240Display Color 65KAnalog bandwidth 0 - 1MHzMax sample rate 1Msps 12BitsSample memory depth 4096 PointHorizontal sensitivity 1uS/Div?10S/Div (1-2-5 Step)Horizontal position adjustable with indicatorVertical sensitivity 10mV/Div?10V/Div (with ×1 probe)0.5V/Div?10V/Div (with ×10 probe)Vertical position adjustable with indicatorInput impedance >500K?Max input voltage 80Vpp (by ×1 probe)Coupling DCTrig modes Auto, Norma, Single, None and ScanFunctionalities: Automatic measurement: frequency, cycle, duty, Vpp, Vram, Vavg and DC voltagePrecise vertical measurement with markersPrecise horizontal measurement with markersRising/falling edge triggerTrig level adjustable with indicatorTrig sensitivity adjustable with indicatorHold/run featureTest signal Built-in 10Hz?1MHz (1-2-5 Step)Waveform storage SD cardPC connection via USB as SD card readerUpgrade by bootloader via USBPower supply 3.7V Chargeable Lithium battery / USBDimension (w/o probe) 105mm X 53mm X 8mm

author: KuchateK
author_rank: Regular Contributor
timestamp: October 21, 2009, 09:32:30 am
content: MP3 player converted into scope?

author: EEVblog
author_rank: Unknown
timestamp: October 21, 2009, 12:11:08 pm
content: Quote from: KuchateK on October 19, 2009, 08:56:16 pmI've got some Gossen multimeters already in the mail for review, plus a brand spanking new Fluke meter just released on it's way for review in a few weeksDave.

author: Unknown
author_rank: Unknown
timestamp: October 21, 2009, 05:06:14 pm
content: Regarding Gossen multimeters compared to cheap multimeters, here is what Gossen has to say about cheap multimetershttp://www.gossenmetrawatt.com/english/seiten/cautiondangerousmultimeters.htm- Including a video of a burning meter. A related video is athttp://gps.sozialnetz.de/global/show_document.asp?id=aaaaaaaaaaaakarLet's see if Dave can spark the same flames :-)

author: armandas
author_rank: Frequent Contributor
timestamp: October 21, 2009, 07:52:47 pm
content: QuoteYour videos just can't come out soon enough!

author: EEVblog
author_rank: Unknown
timestamp: October 21, 2009, 09:14:53 pm
content: Quote from: Andrew on October 21, 2009, 05:06:14 pmThat's on the the to-do list!I'm having trouble finding info on the exact test pulse conditions used to get that result, might have to actually ask Gossen.They are also supposed to be sending me a couple of old meters to destroy tooDave.

author: Unknown
author_rank: Unknown
timestamp: October 21, 2009, 09:40:40 pm
content: Quote from: EEVblog on October 21, 2009, 09:14:53 pmFollowing the links I think some version of IEC 60010-1 and IEC 61010-031 were the base for the testing.

author: Neilm
author_rank: Super Contributor
timestamp: October 24, 2009, 08:45:40 pm
content: Quote from: Andrew on October 21, 2009, 09:40:40 pmIEC61010-1 is the general requirements for test and measurement equipment. -031 is the requirements for test leads. As I can't see a CAT rating on either instrument or video I can't tell you what the correct surge requirement would be. I can say I have seen the results of a very cheap meter (CAT III 600V) having a 4kV spike on 400V supply. It took out the lab circuit breaker (60A) and blew the plastic window over the display about 2 ft away from the instrument.

author: Dago
author_rank: Frequent Contributor
timestamp: October 25, 2009, 04:17:15 pm
content: I'd like to see practical real world stuff on op-amps, like how to select an op-amp for some certain application or how the real world op-amp parameters (offsets, slew-rates, whatever) affect stuff and in what kind of application you need low slew rate or low offset etc.Op-amps are an interesting topic (to me at least) because in theory as ideal components they are very simple but in practice they are quite complicated and hard to do stuff "right" with them.Btw. what is the allowed avatar or posted image size on the forum?

author: Veramacor
author_rank: Regular Contributor
timestamp: October 26, 2009, 10:47:48 pm
content: Might I suggest a review of digital power supplies? Newbies as myself would benefit. I have a 3A Radio Shack and a 20A Astron, both 12 Volt, but those in the market for more control of their voltages and current would find a review on the subject I'm sure quite useful.V

author: EEVblog
author_rank: Unknown
timestamp: October 27, 2009, 12:14:15 am
content: Quote from: Andrew on October 21, 2009, 09:40:40 pmSome poking around pointed me to IEC 61508 part 5, but finding a download seems next to impossible without paying a few hundred $$$Dave.

author: Unknown
author_rank: Unknown
timestamp: October 28, 2009, 11:02:47 am
content: Hi Dave,It's been great following your blog. Lots of good stuff.As I was just replacing my printer cartridge today in my printer (Epson R210) as I have done hundreds of times before, I realized I had never actually looked inside one of them. I know it has a little chip on it, which I presumed was detecting when it was empty. So today I attacked it with a stanley knife to see what makes the cartridge tick. It was pretty interesting what was inside the cartridge .... well anyway what I was getting at, why not pull one or two of them apart in your blog? ..... right I'm off to try to figure out how to clean up this mess off my hands and the table from a supposedly 'empty' cartridge that the printer reported it could no longer use.

author: Neilm
author_rank: Super Contributor
timestamp: October 28, 2009, 09:24:03 pm
content: Quote from: EEVblog on October 27, 2009, 12:14:15 amMultimeters are not covered by 61508 - that relates to safety in process control. They are covered by 61010-1 " Safety requirements for electrical equipment for measurement, control, and laboratory use". The range of tests include misconnections (for example attaching the meter to the maximum volts when it is set in current mode) physical damage (dropping large steel ball from 1m onto it) and surges to test overvolts protection systems. (600V CATIII would be 6kV surge I think). Part 031 details the requirements of the test leads.Neil

author: XynxNet
author_rank: Regular Contributor
timestamp: October 30, 2009, 03:22:30 pm
content: I wish you would make a blog about top quality analog multimeters, Dave.During my work in my physics institut I often had to argue against the opinion that cheap digital multimeters are more precise.

author: Neilm
author_rank: Super Contributor
timestamp: October 30, 2009, 06:35:27 pm
content: Can you still get true analogue multi-meters? Most I have seen recently appear to be a digital system driving a movement.Mind you, thanks to the European Union I belive these are now classified as machines so have to meet the machinery directive.

author: EEVblog
author_rank: Unknown
timestamp: October 30, 2009, 09:40:56 pm
content: Quote from: Neilm on October 30, 2009, 06:35:27 pmYes, Triplett for example still make them.I've got a Triplett 630NAhttp://www.triplett.com/product_info.php?cPath=26&products_id=57Dave.

author: Unknown
author_rank: Unknown
timestamp: November 05, 2009, 01:09:57 am
content: Hi Dave! Great video blog, I like itQuick tip about the forum itself. I just registered and it sent me the activation e-mail. This first mail also contained the password I had set for my account. This is unsafe and a bad practice, I'd suggest you do something about it.

author: EEVblog
author_rank: Unknown
timestamp: November 05, 2009, 01:19:58 am
content: Quote from: talex004 on November 05, 2009, 01:09:57 amSomeone else mentioned this, but I cannot find any option in the forum to disable it, so if anyone knows how then please let me know.I can't read your password, so it's pretty secure, unless someone intercepted your email!Dave.

author: Unknown
author_rank: Unknown
timestamp: November 05, 2009, 10:49:15 am
content: I just found out how. You'll need to edit one of the source files of the forum. The file is here:/Themes/default/languages/Login.english.phpThe line you need to edit is:$txt['register_activate_message']Once you do it, I recommend you register a new user account, just to make sure everything is alright, and then delete it later.I hope you understand php syntaxGood Luck!

author: mightyohm
author_rank: Regular Contributor
timestamp: November 10, 2009, 06:20:41 am
content: I'd like to see a discussion of multimeter "counts", how they affect accuracy, etc.

author: Dago
author_rank: Frequent Contributor
timestamp: November 10, 2009, 09:15:32 am
content: Quote from: mightyohm on November 10, 2009, 06:20:41 amI'm pretty sure Dave has already covered this in some video

author: EEVblog
author_rank: Unknown
timestamp: November 10, 2009, 09:14:34 pm
content: Quote from: mightyohm on November 10, 2009, 06:20:41 amYour wish is my command!http://www.eevblog.com/2009/08/21/eevblog-26-multimeter-counts-accuracy-resolution-calibration/Dave.

author: mightyohm
author_rank: Regular Contributor
timestamp: November 11, 2009, 02:09:38 am
content: My apologies, I still have 20+ back episodes to watch. I've been getting through 3-4 a day this week. Will check it out!

author: Unknown
author_rank: Unknown
timestamp: November 11, 2009, 12:27:56 pm
content: Dave,Could you talk about the hows- and whys- of PLL's? My PIC32 uses a /2 then *20 PLL mechanism to obtain the necessary 80MHz from an 8MHz oscillator... WHY?!! Why not simply use a 80MHz oscillator, and only /2 later for the peripheral bus? This sounds kinda "Rube-Goldberg" to me!Also, in my quest to measure the clock on everything electronic I own, I found a neat little IC from Cypress, a CY22050ZX in an old satellite modem that I had lying around-- 50Mhz in, 100Mhz, 10Mhz (x3) out-- and apparently, they're "field programmable!" Perhaps you could white-board how this works?Thanks,-Trent

author: Unknown
author_rank: Unknown
timestamp: November 12, 2009, 09:14:50 am
content: Quote from: TrentO on November 11, 2009, 12:27:56 pmhttp://en.wikipedia.org/wiki/PLLis a great place to learn the basics of PLL (it even goes into the maths required for the filters etc), one of the best way to learn about things like a PLL is to play with one, the easiest way to do this at home is to play with the 4046B (this is a standard CMOS chip made by every man and his dog), You could go and find a discreet PLL circuit and build it, but you will not learn much more than you would playing with the 4046B.Quote from: TrentO on November 11, 2009, 12:27:56 pmhttp://www.cypress.com/?rID=13742Is the Cypress page for this part, it explains everything you need to know to play with this partIt actually looks like a great part till you read the datasheet and find you can only program it 100 times (I am sure you could program more than this, but this value is the MINIMUM number of times they guaranteeThere are some clock generators out there that are serially programmed (eg I2C, SPI etc) that you have to set them up EVERY time you power the system up, these can be changed for ever, I was actually thinking of using one of these as the heart of a frequency generator.

author: cd
author_rank: Newbie
timestamp: November 13, 2009, 10:10:29 am
content: A chat about your product's lifetime and the reasons for it would be interesting.Reviews of your favoured hand tools and why.

author: Unknown
author_rank: Unknown
timestamp: December 04, 2009, 03:39:46 am
content: Hey Dave,Great blogs, I love them.As a 'sidebar' podcast, how about a little tour of your bench behind you? I'd be interested to see what you got hanging out back there.Like that little yellow panel that's mounted under the left corner of your benchtop...Bryan

author: Dago
author_rank: Frequent Contributor
timestamp: December 04, 2009, 09:20:44 am
content: Quote from: cygnus2112 on December 04, 2009, 03:39:46 amI'd assume it's the grounding point for ESD straps and such.

author: Unknown
author_rank: Unknown
timestamp: December 04, 2009, 08:23:14 pm
content: Hi. Dave, I love that your blogs assume a certain level of professional experience, so I almost hesitate to request this subject, but as a newb it's something that would really interest me.When faced with unfamiliar territory, i.e. specs that have requirements you have no experience in, how do pros go about researching and choosing parts? It seems to my uneducated eye that there are about 1.24x10^23 chips available out there... how do you keep track, how do you know you're not spending 3 days on a portion of a circuit when there's a 30p chip available from XYZ corp to do the same thing, etc?Obviously with experience you amass a library of favourite parts in your head, but what resources do you turn to when your internal catalogue fails you?

author: armandas
author_rank: Frequent Contributor
timestamp: December 04, 2009, 08:45:29 pm
content: Quote from: rfrey on December 04, 2009, 08:23:14 pmSimple, you just spend those three days looking for that part in various catalogs!

author: Unknown
author_rank: Unknown
timestamp: December 05, 2009, 07:54:58 am
content: Quote from: rfrey on December 04, 2009, 08:23:14 pmI use various resources, RS and Farnell catalogues, the flyers that companies like Maxim and Ti send out (these product briefs are great to get you in the right direction)If you really are stuck, suppliers reps can sometimes provide a good lead, I sometimes find it hard to describe the function I need the way that the manufacturers call it, it also helps to think outside of the square, you may need an operational amplifier, but you have to remember that just because a part is marked "Video Amp" does not mean you can not pass an audio through it.

author: EEVblog
author_rank: Unknown
timestamp: December 05, 2009, 08:38:54 am
content: Quote from: rfrey on December 04, 2009, 08:23:14 pmGreat question, and this is something I've been meaning to do a blog on for a long time now.Basically it all comes down to hard work doing the research. Probably a good 80% of my design time is spent finding the right parts.Not only trying to find out what chips are available to do certain jobs, but what ones are available in the qty I need, at the price I need, in the package(s) I need, with the specs I need, with available brand substitutes!It 's not uncommon the change the specs of your design because of what parts you can actually get or can afford.Cost driven designs are harder because you can't just pick the first chip you find that meets your requirements.Not as hard as it sounds, but very very time consuming. My tools are usually the big component suppliers first (Digikey, Mouser, Farnell) to find actual parts based on various functional categories. i.e. Opamp -> Dual - > Low Power -> 5V single supply -> SO8 packageThen findchips.com and octopart.com to find the best price and how many people stock that part.Then the manufacturer websites if needed for more exotic part searches.Dave.

author: hakko
author_rank: Contributor
timestamp: December 06, 2009, 12:34:45 am
content: Quote from: EEVblog on October 21, 2009, 09:14:53 pmWhy instead destroing all of then why not to make a raffle of some of it to forum membersOne per month of reweied instruments should be nice for forum users!B.RMatheus

author: armandas
author_rank: Frequent Contributor
timestamp: December 06, 2009, 11:21:05 am
content: Quote from: hakko on December 06, 2009, 12:34:45 amI didn't know it was raining equipment in Dave's labSeriously though, the talk is about destroying a *cheap* multimeter.

author: Unknown
author_rank: Unknown
timestamp: December 08, 2009, 12:27:40 am
content: How about a blog on EE design best practices. I loved the blog about "Worst Practices", or how things are typical in an EE design firm and how managements screws things up, etc., but what are the best practices?I have been in software for 15+ years and know a lot about best practices there and have coached a lot of newbs on how to be successful with software design while reducing headaches by using some simple project life cycle techniques/methodologies, but I would love to hear about the "ideal" way to do it in the EE world. What are the typical roles (besides the actual engineer), etc? How is quality verified (QA)? How are changes/revisions managed?

author: Unknown
author_rank: Unknown
timestamp: December 09, 2009, 03:05:04 pm
content: Quote from: EEVblog on December 05, 2009, 08:38:54 amThanks for the rundown - If I had been to guess a % of project time I'd have guessed in high 10s or low 20s. This one post is a real perspective changer for me.

author: Unknown
author_rank: Unknown
timestamp: December 09, 2009, 03:08:58 pm
content: Quote from: GeekGirl on December 05, 2009, 07:54:58 amI guess that's why design is at essence a creative activity and why people like you and Dave are deservedly driving your Lotus Esprits to your personal helicopters to commute to work. As it should be.Seriously, it sounds like the parts search is a much bigger bag of worms than I thought, and may even be at the core of the profession in some sense.

author: yoshiki
author_rank: Contributor
timestamp: December 14, 2009, 01:59:22 am
content: I would love to see a comparison between electronics simulation software, some people say B2-Spice is the best, I personally agree with that but I know there is more out there, which one do you recommend, why?

author: Unknown
author_rank: Unknown
timestamp: December 19, 2009, 07:09:24 am
content: I have a good topic for a blog, SMPS, in things like CFL's, We have all had a CFL just die with a "POP" I have yet to pull one apart, I have the ideal candidate, it is a 130W CFL (power consumed not incandescent equivalent, that is around 500W lol)I always love small discrete SMPS, no controller, just a bridge with bulk cap, 2 transistor multivibrator, transformer and then the output bridge and filter cap.

author: Simon
author_rank: Unknown
timestamp: December 26, 2009, 10:11:18 am
content: how about a blog about HD44780 displays ? they are probably the most eleasing thing for a pic/uC user but perhaps not the most obvious things to use ?

author: kodon
author_rank: Contributor
timestamp: April 03, 2010, 11:20:54 pm
content: Hello,I e-mailed to dave about a week a go with the gyroscopes... But it seems that it was not interesting enough to blog about.Well here's an another idea:How to improve a switching mode power supplies efficiency? What are the things to watch out etc... I'm interested in this because I desigined and built a push/pull SMPS and ran out of ideas how to make the FET's to run cooler. Well, the heating problem is now solved with a better heatsink, but there's obviously some things that I am not aware of. I studied how to clamp that thing but that just reduces the efficiency. So how on earth are you supposed to have 80% plus efficiency out from those things? My built is running now about 55 to 60 percent. The FET gate Voltage is nice and clean, I'm using a power mosfet driver +/- 1,5Amps to the gates @30kHz, I tried various deadtimes etc... I'm trying to rise 12VDC to ~600VDC for CDI.On the LED hacking blog Dave said something about another transistor with the buck converter... what was that all about?And generally, I just started to wonder how can you improve a SMPS efficiency? It seems that the greater the efficiency, the higher the FET's Drain to Source Voltage toleration should be? Am I totally wrong?? Also it seems that the transformer's coils should be winded in some particular order to get the best efficiency out of itSo there's a lot of mysteries behind and I think this would be very useful information to anyone who watches your blog.So how about it?