• Chat

    The EEVblog Chat system is a place for like minded people to hang out and chat about electronics, or anything in general.
    There is just one rule, don’t be a dick.

    You can use the embedded window below, or use your own IRC client by connecting to:

    Here are two web based IRC clients that let you chat directly on this page without any account, just jump in and chat!

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      • moe qahtani

        Hello, I have been doing a research on how to measure the energy of a spark. I’m having an issue with the duration of the spark which is about 3 micro seconds. If anyone knows how to deal with that, help is needed.

      • showdoc

        curious –
        have seen a a number of constant volt/current output modules on ebay –


        anybody have one or know how good these are?
        like to build a bench power supply – thought these might work nicely vs one of the cheaper units.


      • 2ontrack

        Forget solar roofs. The world’s first solar road is here, in the small village of Tourouvre-au-Perche in Normandy, France. The 1 kilometer road was opened yesterday by French Ecology Minister Ségolène Royal and could generate enough electricity to power the street lights. http://www.theverge.com/2016/12/22/14055756/solar-panel-road-electricity-france-normandy

      • Dave, The EEVblog Brymen BM235 Multimeter on Amazon (US) shows “currently unavailable”. Will more be available soon? Looking forward to getting one soon!

      • Rafael Lafuente

        Hello from Spain, Dave. I need a soldering station (only with iron, no air) but under 100 €, and all the models about this price are Aoyue, Yihua, Bakku… Please can you help me about this? (no hakko, please, because hakkos in Spain are all fake. The original Hakko works in 110 V. and the Hakko I can buy here works in 220 V. , fake)
        Best Regards

      • Ali Namazi

        Hello from Germany. Can anyone say that this Desoldering-Unit is good?

      • Marian Calarasu

        Hello from Romania. Any sugestions about Stamos brand?
        I’m interested about a hot air soldering station…

      • Taiga

        I have been waiting for admin approval of my registration since January 4th. Is this normal? What am I supposed to do to get approved?

      • Richard Mellersh

        ‘Gday from Oxfordshire in the UK. Hi Dave, your blogs are becoming addictive – keep it up – firstly, as a result of one of your blogs & after a bit of research I bought ‘The Art of Electronics’ (the real one) and I can’t put it down!. second, I bought one of your EEVBlog DMM’s and it is just as you say a great little thing. third thing, I already had a CEM DT-9663BT and was wondering if it is this maker that you are using for you 121CW? If so would you be able to review this model sometime as I’m curious to know about the trimpots all over the pcb. all the best blue.

      • Andrew Stein

        Love the videos. Would you do a “Tear Down” / “Debunking” of HDMI converters like this? See these examples on Amazon – I would like to know if these things work. Or are they fakes? I don’t want to give up my older receiver that requires RCA input, for 5.1 surround. Amazon link: https://smile.amazon.com/gp/offer-listing/B019RF7ZVA/ref=dp_olp_new_mbc?ie=UTF8&condition=new

        • Gunjan Upadhyay

          can you share details about your HDMI source device and Amp .
          these devices do work there is nothing to Debunk about them ,they take digital input converts it to analog output , they provide additional HDMI & SPDIF out similarly to USB Hubs ,and since HDMI is digital signal there is no degradation in its HDMI out.Because there are so many similar devices before ordering make sure the device you order have minimum 20 to 25 reviews and feedback of 3.5 – 4 star.

          If your source is a P.C. / Mac or a Laptop the best result you will get is by using device like :

          Creative Sound Blaster X-Fi Surround 5.1 Pro USB Audio System Link- https://www.amazon.com/Creative-Blaster-Surround-System-SB1095/dp/B0044DEDCA or Asus Xonar U7 Link- https://www.amazon.com/Xonar-U7-MKII-Headphone-Amplifier/dp/B06X3RGC8Y these two devices are amazing having S/N Ratio greater than 105 – 110 dB.Gunjan ,

      • Fabio Barone

        Hi Dave, I enjoyed watching EEVblog #527, then I searched your blog (http://www.eevblog.com) for any new videos or posts regarding Altium CircuitMaker, but got no results for “altium” or “circuit maker” and all permutations of these strings for lower case, upper case, spaces, no spaces, etc. What gives? Has there been any videos on Circuit Maker since #527? Thanks in advance.

      • aljosa mlinaric

        Hi Dave

      • Stephen Low

        Hi Dave,

        I’m staggered by the genius behind some pairs of eyes. This one floored me tonight.
        (No affiliation).

      • Martin C


        Has anyone watched the “The Theory of Everything” a 2014 movie about Stephen Hawking? There is one scene where Stephen Hawking is taken to the lab where Rutherford split the atom. You can see an oscilloscope in the scene.

        I am fairly certain that it is way too modern for an early 1960’s oscilloscope.

        Can anyone out there confirm that?


      • Hi Dave, been watching your chanel for a while now, and love electronics and a master noob in electronics. doesn’t bother me, i enjoy learning, especially from people like you.

        What i notice as an absolute noob is that it is hard to find simple electronic circuits. like a diode in combination with a capacitor produces a way to measure the peak level of an ac input.

        As a noob i am super intrested in these kind of mini circuits. Maybe an idea to do a eevnoob channel or something ?

        good luck mate and thanks so far.

      • Steven Corson

        I’m designing a hand-held device for a
        client, and I’m in need of a membrane switch keypad. One of the requirements is that the
        keypad be manufactured to withstand moisture. Do you know any companies who specialize
        in very tough keypads for rigorous environments?

        • Gregory Heinz

          While I’m not sure where you are located, I’ve used a company called SSI Electronics in The States.
          They had a ton of unique ways to “beef up” a typical keypad to make it stand up to harsh environments. In fact, the project I used them for was a medical one. I typically find that nurses are very hard on equipment(not to mention the chemicals they use), and we’ve had great success after a couple years of our products being in the field. Good Luck!

      • Gabriel Barrandeguy

        what is the best universal programmer ? xeltek vs elnec

      • Ilan Messing

        uh oh! why is chat down?

      • Mounish Periyasamy

        WIll DSO is more enough for power analysis of a crypto system or i need to go with MSO?

      • Richard Bell

        Wondered if you have ever came across these battery chargers. I bought one and was given one. They are set to recharge battery’s in pairs. On both chargers the right banks get hot. At first i thought it was a problem with one charger but both do it. The battery’s get hot (over charged) .Thought these were fitted with temp sensors on both banks but something is a miss with them. So now stopped using as one pair of battery’s very near melting (very hot) https://uploads.disquscdn.com/images/97990b1114f938437253e43717f5d23226e530ebbef1db332fb4c2a05f8e795b.jpg

        • Die JeCo’s

          Are you using normal batteries or accumulators?
          Because you can’t “reload” normal batteries and they almost looks the same as accumulators.

      • Mohammed Jassim

        https://uploads.disquscdn.com/images/22290f0a3f6b1e4fcb407d6e2dc235ffe26dbc6ce6f25653ad02062523fcac1b.jpg Hello Dave,
        i have a 30KVA APC UPS need calibration. any idea how to do it?

      • Powerelectronicsguy L


        I’m a US yank living in Florida. “Wafi” is a slang sailing
        term (google it). Several of my friends sold their homes, bought a sailboat,
        became wafies, and blue water cruisers. Some actually made it to the eastern
        hemisphere where marina shore power outlets are 230v 50Hz 50amps. Most all of
        their onboard appliances are 240/120v 60 Hz and do not work with lower
        frequency power. I also recently met a British bloke with the opposite problem.
        He wants to run his 50 Hz appliances from US 240/120v 60 Hz 50amp marina

        Most of these wafies do not have a pot to piss in or a
        window to throw it out of after buying, refitting, and provisioning their
        sailboats. Several have become bikini clickbait Youtube beggars. Because of
        this, I would like to DIY build a “shore power converter” for them. This device
        is basically a high power switch mode AC to DC converter (+/-350Vdc 17.5amp) directly
        wired into a pure sine wave inverter. The device input would be anything
        between 120v to 480v AC 45-65 Hz in at or near 12kw and a switchable 240/120v 60
        Hz output or a 230v 50 Hz output at or near 12kw less device inefficiency.

        The internet is filled with low power SMPS projects. Would someone
        please help me design this 12kw device? I’ll assume it would involve wrapping several
        turns of 20amp wire around large toroids and connecting forced air heatsinked
        high power mosfets to a control circuit and switchmode noise filter. If Dave
        would get involved, this would truly be his first high power (12kw) project on
        EEVBlog and it might even go viral on Youtube. Thank you for any reply or

        Best regards.

        Jack Laturell
        [email protected]

        • David S.

          So…you have these broke idiots sailing around and you want them to build themselves a device that uses mains voltages and handles up to 12kw? You know what would be much more likely to go viral? Videos of them making and connecting this deathtrap to a plug.

      • Michael Bauer

        Recently I bought a NKR (Not Kwite Right!) model K1000 “mini 2-channel audio mixer” from a supplier on AliExpress (for under AU$30 incl. post), only to discover that it does not function as a mixer at all, but rather as a 2-channel audio switch! On the plus side, it has a digital echo processor. No mention of this in the product spec’s, but the ad on Ali implies it connects to a mobile phone via USB! I pulled the thing apart and reverse-engineered it to see if it could be modified to function as a mixer.

        Sure enough, there were some missing resistors which, if fitted, could make it work as a mixer, but I suspect not optimally. I devised a simple modification to make the device function properly as a mixer and to use the echo processor more effectively. Let me know if you want details of the mod. To find the product on eBay or Aliexpress, use the keywords “mini sound mixer K1000”. By the way, there is no USB connectivity… the USB socket is used solely for charging the battery. https://uploads.disquscdn.com/images/1777a3be892d85b1bb857ab26dad5bf930edbe430eeddc1f8194a0788014ad7f.jpg

      The EEVblog Store generally ships twice a week, on Tuesdays & Fridays, Sydney time. Dismiss