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  • TCSC47 commented on MikeTheMaker's instructable Repair Christmas Lights3 days ago
    Repair Christmas Lights

    I haven't tried it but I don't think it would work for LEDs. If you have your meter one way round you may have reverse bias of the LEDs and so no reading on your meter. The other way round and you will be forward biased but there will need to be 1 to 1.5 V across each diode before they conduct and again you will get no reading on your meter.The other problem with LEDs is that they are all soldered in so you would have to cut the insulation to get at the wire, and it is going to get a bit messy, I would think.But of course the advantage of diodes is that they don't suffer anywhere as badly as filament bulbs and their unreliable sockets. I have just hung up my LED lights I bought 10 years ago and they are still working perfectly. Back in the day, I could get out of all the other Christmas...

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    I haven't tried it but I don't think it would work for LEDs. If you have your meter one way round you may have reverse bias of the LEDs and so no reading on your meter. The other way round and you will be forward biased but there will need to be 1 to 1.5 V across each diode before they conduct and again you will get no reading on your meter.The other problem with LEDs is that they are all soldered in so you would have to cut the insulation to get at the wire, and it is going to get a bit messy, I would think.But of course the advantage of diodes is that they don't suffer anywhere as badly as filament bulbs and their unreliable sockets. I have just hung up my LED lights I bought 10 years ago and they are still working perfectly. Back in the day, I could get out of all the other Christmas chores trying to get the blessed tree lights working!

    Good one. Many people think electrics and electronics are difficult, but a lot of problems are solved with the logical thinking shown here.I would add that if anybody asks why do we need something like this with the very reliable LED lights we have nowadays, I would counter that filament bulbs tend to have a gentler and softer illumination that many people prefer.

    Totally agree. Easy to check if you have an ohm meter. Measure the hesitance of a bulb known to be working and check that the replacement bulb has the same resistance. My problem with this was getting a decent contract between my probes and the wire of the bulbs. Very fiddly.

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  • TCSC47 commented on iain_h's instructable Handmade Electric Guitar6 months ago
    Handmade Electric Guitar

    Nice one. I bet you are still playing this guitar when you are 70!

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  • How to "Weld" Aluminum Without a Welder

    Cheers Fred. I found your comments very interesting. I learnt how to weld aluminium many many years ago as an apprentice and I found it quite hard. I would prefer using glue of some sort but having seen it used in car manufacture what worries me is its toxicity. There were quite a lot of precautions taken to keep the toxic fumes away from the workers. The other thing is the need to make sure the surfaces are extremely clean (toxic cleaners again?). You deal with that well, but I have to admit as an amateur nowadays,it is the fault of many of my gluing attempts. Some times my joints work well and sometimes they don't and I put it down to poor preparation as much as buying a cheap glue.

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  • How to Upgrade Your Vehicle's Exterior Incandescent Bulb to LED

    It is correct that your Instructable only refers to side lights, but ICBM's warning is very apt. Your article should have contained his warning as it goes a long way towards encouraging swapping main headlight bulbs for perhaps inappropriate LEDs even if it does not show it.

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  • TCSC47 commented on diyer2112's instructable HOMEMADE Hydrogen Generator1 year ago
    HOMEMADE  Hydrogen Generator

    Hmm-m. An appropriate time to remind people that Chernobyl was not a nuclear explosion, but was a hydrogen explosion!

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  • TCSC47 commented on mikeasaurus's instructable Unusual Uses for WD-401 year ago
    Unusual Uses for WD-40

    Excellent article stating the limitations of WD40 straight away. I am one of those who fell foul of WD40 by trying to lubricate a clock and some of my model trains. It so looks like a fine oil. But--- Fail!However, WD40 is still a wonder chemical to me. Of course, I have used it when I needed a short term lubrication and did not have to worry about the long term consequences. Many years ago I used it to get my future Mother in Law's car going after she drove through a small flood and got water inside the distributor. Fired up straight away after spraying in WD40 --- HERO!!Mike says to be careful about spraying it on electronics because it may damage some of the plastics. I don't disagree but just to say that I thought it was originally developed for the job of preserving the electronic...

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    Excellent article stating the limitations of WD40 straight away. I am one of those who fell foul of WD40 by trying to lubricate a clock and some of my model trains. It so looks like a fine oil. But--- Fail!However, WD40 is still a wonder chemical to me. Of course, I have used it when I needed a short term lubrication and did not have to worry about the long term consequences. Many years ago I used it to get my future Mother in Law's car going after she drove through a small flood and got water inside the distributor. Fired up straight away after spraying in WD40 --- HERO!!Mike says to be careful about spraying it on electronics because it may damage some of the plastics. I don't disagree but just to say that I thought it was originally developed for the job of preserving the electronics of 1960's ICBMs whilst they sat in their silos. 15 years ago, I was in charge of a university undergrad electronics lab. We had 30 PSUs that were on their way out. The voltage control pots were noisy and caused the output voltage to flick up and down as they were turned with potentially disastrous effect on the students electronics. I didn't have the time to replace all the 30 pots, so I sprayed WD40 into the pots and BINGO! They worked properly. Mind you the repair only lasted 8 or 9 months but I just sprayed them again! If the PSUs were used in a critical application and I was not going to be present to pick up the pieces, I would have done it properly. Apparently what we are seeing here is "quantum tunnelling". WD40 is normally an insulator until we are down to molecular dimensions. Then it acts as a conductor as the electrons tunnel through it Shades of Star Trek or what!!?I have used WD40 to get chewing gum and blutack out of carpets. Spray on WD40. Rub vigorously with a cloth and remove the gum. Clean with detergent or carpet cleaner to get rid of WD40. Brilliant!The most surprising use of WD40 to me and one I haven't seen mentioned here was to unstick a wooden exterior door. Our kitchen door had swelled and jammed a bit. I simply sprayed WD 40 on the bit of the door that was sticking. It apparently penetrated through the paint and displaced the water out of the wood cells. It really worked! HERO again!

    Just to add, I would not spray it on my skin. For a start, use barrier cream if you are going to get to the state that WD40 will deal with. Secondly, at age 70, I can tell all that our health is far too valuable to use short cuts over. It is difficult to get back if you loose it!

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  • TCSC47 commented on Karlstrom's instructable Build Your Own Development Board1 year ago
    Build Your Own Development Board

    I have been using veroboard since it was invented (I am that old!!) and I have never seen or thought of putting a printed over plan on it as shown in your picture. What a great idea! Much respect if it is your idea.

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  • TCSC47 commented on AlexB504's instructable TfCD touch / slide bar1 year ago
  • TCSC47 commented on aerdronix's instructable Arduino IoT Robotic Arm1 year ago
    Arduino IoT Robotic Arm

    Good one. A very comprehensive project.

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  • Simplest Wireless Electricity Transmission Experiment

    It is not racist to point out when people are being rude.

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  • Simplest Wireless Electricity Transmission Experiment

    No, it is rude, like whispering in public. You could be saying anything. At the university where I worked there were a lot of students whose first language was not English, but in class they were not allowed to converse in their own languages for precisely this reason.

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  • DIY: Squeeze Extra Capacity From Old NiCd Batteries

    You will find that the B6AC battery charger is extremely useful and versatile. Mine cost only £20 from China. It might be a copy but it works fine. Difficult to understand how to use it though because the instructions are in Chinglish.

    You also assist yourself to get a better solder joint because you can heat up the thin metal connection to the required temperature more easily. Particularly a good idea if you have a small iron.

    Good one.

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  • Simplest Wireless Electricity Transmission Experiment

    This web site is not intended as a history site, so the mentioning of particular people who had a historical input into the topic being discussed is slightly irrelevant. It is intended for people to talk and demonstrate projects and other things that they have found interesting.Also I would suggest that as this is an English speaking web site that you should respect that and write in English. You can clearly understand English or you wouldn't have been able to read it. If I were posting on a Russian site, I would write in Russian out of politeness.

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  • TCSC47 commented on How-ToDo's instructable Powerful burning Laser2 years ago
    Powerful burning Laser

    It is an order of 100 times 5mW.

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  • TCSC47 commented on How-ToDo's instructable Powerful burning Laser2 years ago
    Powerful burning Laser

    So, what do you use it for?

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  • TCSC47 commented on Honus's instructable Convert old cordless tools to Lithium power2 years ago
    Convert old cordless tools to Lithium power

    Great idea. I have a couple of old drills that I will convert. They have Ni-Cd cells which did not last very long. Also the big trouble of Ni-Cd is that if you recharge them before they are completely discharged, they have a "memory" effect that effectively reduces their capacity. The only way to always have drills ready to work was to have two sets of batteries. (You might have said this, but I scan read your article - sorry!)My early Ni-MH did suffer from discharging on the shelf, but my more modern ones keep their charge much better and as I've got a pile of cheap AA of 2000mAh (Chinese, I'm afraid) I'll see how I get on with these. I have an imax B6AC cheap charger which works quite well.

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  • TCSC47 commented on deba168's instructable Make 4 Useful Things From 9V Battery2 years ago
    Make 4 Useful Things From 9V Battery

    Exactly right. I think the value of this site is to encourage an interest in technology by constructing things.

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  •  Generate Electricity Using Footwear-Charge Your Mobile(Piezo Generator)

    You have only given us a quarter of the project. Voltage sensing switch? USB wiring? How did an LED magically appear in the testing of the circuit? Spec and sourcing of the piezo device?As regards the voltage sensing switch, what exactly do you mean? The circuit that would be used in such an application would be called a diode pump circuit (look it up). The pump would decouple the voltage spikes generated by the piezo device from 0V and allow them to sum onto the voltage across in the capacitor.

    You have only given us a quarter of the project. Voltage sensing switch? USB wiring? How did an LED magically appear in the testing of the circuit? Spec and sourcing of the piezo device? Battery spec?You are missing a vital part of the circuitry. You need a diode pump circuit (look it up) between the bridge rectifier and the charge storing capacitor. The pump would decouple the voltage spikes generated by the piezo device from 0V and allow them to sum onto the voltage across in the capacitor. I presume the voltage sensing switch is really a voltage limiting circuit to avoid excessive pd, across the battery?Sorry, not impressed.

    You have only given us a quarter of the project. Voltage sensing switch? USB wiring? How did an LED magically appear in the testing of the circuit? Spec and sourcing of the piezo device?You are missing a vital part of the circuitry. You need a diode pump circuit (look it up) between the bridge rectifier and the charge storing capacitor. The pump would decouple the voltage spikes generated by the piezo device from 0V and allow them to sum onto the voltage across in the capacitor.Sorry, not impressed.

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