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  • zanod commented on MatiasMamo's instructable Practical Demonstration of Ohm's Law4 weeks ago
    Practical Demonstration of Ohm's Law

    Did you notice at 5:01 in the video, the HUGE current when the resistance was reduced to zero? ;-)

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  • zanod commented on Yannick99's instructable Table Saw Soft Starter With Option Output2 months ago
    Table Saw Soft Starter With Option Output

    If a guy had been demonstrating the soft-start, I'll bet you anything he would not have had a low-cut T-shirt displaying half his chest. It seemed to me this woman was more interested in showing herself than the device in question. If she doesn't want comments, she shouldn't invite them in that way.

    I made a similar soft-start for a table saw. I bought a low-cost saw, and it had gear teeth cut into the end of the motor shaft, which meshed with a gear wheel on the saw arbor, and after a year of hobbyist use, it had stripped all the teeth off the gearwheel due to accelerating the saw blade up to speed almost instantly - like the kick of a mule! I couldn't get parts, so I bought another cheap table saw (from Aldi), but designed a small circuit - much simpler than yours - and wrote code on an ATtiny85 8-pin microprocessor, which drives a triac to power the saw. It is simply designed to bring the blade to speed in about 2 seconds when the saw is switched on, so the soft-start box is located between the power switch on the saw and the motor. It has been built into the saw for a coupl...

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    I made a similar soft-start for a table saw. I bought a low-cost saw, and it had gear teeth cut into the end of the motor shaft, which meshed with a gear wheel on the saw arbor, and after a year of hobbyist use, it had stripped all the teeth off the gearwheel due to accelerating the saw blade up to speed almost instantly - like the kick of a mule! I couldn't get parts, so I bought another cheap table saw (from Aldi), but designed a small circuit - much simpler than yours - and wrote code on an ATtiny85 8-pin microprocessor, which drives a triac to power the saw. It is simply designed to bring the blade to speed in about 2 seconds when the saw is switched on, so the soft-start box is located between the power switch on the saw and the motor. It has been built into the saw for a couple of fault-free years.If anybody wants the circuit and code, let me know. It was built on strip-board. Components cost was around £12.

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  • Scratch Built Acoustic Absorbers for Bedroom Studio

    What were you actually trying to achieve? - reduced reflections in the room (reduced reverb), or reduced transmission of noise through the wall (improved neighbour relations)? In either case, what tests did you do to check the effectiveness of these dampers? They seem to cover a relatively small percentage of the wall area, so even if they were 100% effective, I would expect them to reduce reflections/transmission by only that percentage. However, 100% effectiveness is usually pretty hard to achieve, so I don't suppose they would be as effective as that.Can you share your test setup and the results?

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  • Hot Stuff! - Building a Wood Fired Oven at Home

    I heard a BBC podcast today (More or Less - http://open.live.bbc.co.uk/mediaselector/5/redir/version/2.0/mediaset/audio-nondrm-download/proto/http/vpid/p070d39y.mp3 - fast forward to 19:30) in which they claimed that wood burning stoves are a greater source of PM-2.5 (particulate matter <2.5 microns) across London than diesel engines are. They estimate the percentage of PM 2.5 pollution in London, emanating from road traffic to be 12%. The amount from wood burner stoves (even though they're not in every house by any means) is 38%. PM-2.5 pollution is associated, they say, with the premature deaths of 29,500 people per year in the UK.

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  • zanod commented on KRP-01's instructable Micro RC Car7 months ago
    Micro RC Car

    A lovely little model, but an unusually poorly described instructable. For example, I just went looking for the micro Rx, but after 20 minutes on the web, I didn't find one. The one and only source I found said "Sold out". Your description of the steering mechanism is also wanting.

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  • 3D Printed Mantel Style Auto Correcting Clock With Chimes and Daylight Savings Time

    Nice project - and very pretty. Here's an idea that you may like.I have had an ambition for a long time to make a wooden clock (with wooden gears) with two chimes, and the chimes would be easy to port to your project - if you're interested, of course. Each quarter hour, the clock would completely specify what time it is. With the traditional Westminster chimes, you may know that it's quarter past something, but the chime itself doesn't tell you what. My two chimes would be a ding and a dong, and would represent binary 1 and 0. and there would be six chimes on the quarter hour. The chimes would be...chime .. chime .. chime .. chime .. [space] .. chime .. chime (4 chimes for the hour and two chimes for the quarter-hour.Each chime would be a ding or a dong (a 1 or a 0)The hour chi...

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    Nice project - and very pretty. Here's an idea that you may like.I have had an ambition for a long time to make a wooden clock (with wooden gears) with two chimes, and the chimes would be easy to port to your project - if you're interested, of course. Each quarter hour, the clock would completely specify what time it is. With the traditional Westminster chimes, you may know that it's quarter past something, but the chime itself doesn't tell you what. My two chimes would be a ding and a dong, and would represent binary 1 and 0. and there would be six chimes on the quarter hour. The chimes would be...chime .. chime .. chime .. chime .. [space] .. chime .. chime (4 chimes for the hour and two chimes for the quarter-hour.Each chime would be a ding or a dong (a 1 or a 0)The hour chime would go from 0 0 0 1 for 1:xx (where xx is the quarter) to 1 1 0 0 for 12:xxThe quarter chime would be 0 0 on the hour, 0 1 for quarter past, 1 0 for half past, and 1 1 for quarter to.Every hour chime has at least one ding and at least one dong, so the difference can be discerned. This means that even if the quatrer-hour chime is 0 0 , you already have a 0 and a 1 in mind from the hour chime, so the quarter hour is easy to distinguish also.So if the clock goes...ding .. dong .. ding .. dong ....... ding .. dong... then it's half past ten.If it goes...dong .. ding .. dong .. ding ....... dong .. ding... then it's 5:15

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  • Recycled Wireless Door Lock (No Coding)

    If you wanted to make something more serious of this, it shouldn't be too hard to incorporate some sort of encryption, such as used in remote opening of car doors. You could use a microcontroller, or it might be possible with the radio control. I fly RC planes, and the Tx/Rx uses all sorts of encryption and channel hopping so as not to interfere with another person's plane - and there can be lots of them in the air at once. I also have a cheap Motorola walkie-talkie that has 128 channels using encryption so that what you say can't be understood by somebody on another channel. That person can hear that you're talking, and he can't use his channel at the same time - but he can't understand what you're saying.I once worked on a hotel door locking system, and the mechanism was better th...

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    If you wanted to make something more serious of this, it shouldn't be too hard to incorporate some sort of encryption, such as used in remote opening of car doors. You could use a microcontroller, or it might be possible with the radio control. I fly RC planes, and the Tx/Rx uses all sorts of encryption and channel hopping so as not to interfere with another person's plane - and there can be lots of them in the air at once. I also have a cheap Motorola walkie-talkie that has 128 channels using encryption so that what you say can't be understood by somebody on another channel. That person can hear that you're talking, and he can't use his channel at the same time - but he can't understand what you're saying.I once worked on a hotel door locking system, and the mechanism was better than simply driving a bolt. If a door sags a small amount on its hinges, the bolt doesn't align any more, and it takes more force that you'd get from a servo. In the hotel mechanism, the servo moved an interposer in the lock, and the lock was opened by manual force. If the interposer wasn't in place, then turning the handle didn't do anything. If it was in place, then turning the handle pushed the interposer, which pushed the latch.

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  • zanod commented on Ryan110's instructable Cycle Tyre Belt11 months ago
    Cycle Tyre Belt

    When you're wearing it, do you find that ladies are queuing up for a date?

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  • Step-by-step Guidance to Build a Drone From Scratch Using Ardupilot APM Navio2 Flight Controller

    Wow! 10 marks out of 10 for the article. Fantastic.There's a lot to be said for DIY - the satisfaction of producing something from your own efforts, and the chutzpah of taking it to the flying club and flying what everybody knows is 'yours'. And then, there's all the experience you get, and the things you learn along the way - which is probably priceless.However, talking of price, I find that it is only worth making something if it is unique, and cannot be found on the market. If a product is available, it is usually cheaper to simply buy it. Compared with commercially available drones with a similar spec to yours, how did you find the cost of making it?

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  • Turn Your Old Plates to Decorative Plates

    AzureOzma - I hope you didn't think my comment about machines was a put-down, intended to trivialise your work. It was more in regret that machines are replacing so many things in life. My passion is for woodwork, and like you, I have made many unique things to my own design, and spent hundreds of hours over getting it right, and like you, I don't use automated tools (though many others do). The work, as you say, is cathartic, and if done as a present for somebody else, is the more valuable for the time and patience you have put into it.

    Beautiful, but like so many other things, this could be easily accomplished by a machine. A CNC router could be used with paint bottles instead of woodworking bits.

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  • zanod commented on Sean of Earth's instructable Convert Light Fitting to LED Cluster1 year ago
    Convert Light Fitting to LED Cluster

    It looks great, and clefrly provides a much better light. I recently converted an anglepoise lamp to take an LED downlighter in my workshop because filament bulbs were always blowing. So far, so good.I hope I'm wrong, but the bulbs you used look like the Chinese style of LED bulb, with lots of little square LED elements in them. If so, good luck with them. I used that style for kitchen downlighters, because the advert said they were good for 100,000 hours. In reality, 8 out of the 12 I bought had failed in under two years. (I calculate less than 1,500 hours)

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  • zanod commented on ariellehein's instructable Mycelial Forms1 year ago
    Mycelial Forms

    I saw a TV programme a while back that showed mycelium being used as an ecological replacement for polystyrene in packaging, and I wondered about its application for model aircraft. Can you say anything about its strength to weight ratio? How does its tensile and compression strength compare with polystyrene?You said something rather concerning in the instructions - "Mold can be dangerous, and is difficult to get rid of once it starts". Could you expand on that? I know dry rot is a real problem in houses, and if anybody unwittingly introduced something like that, he might regret ever experimenting with it. Then you say "if this happens to you it is usually a sign that you should start over" I would have thought it might be more appropriate to say "if this ...

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    I saw a TV programme a while back that showed mycelium being used as an ecological replacement for polystyrene in packaging, and I wondered about its application for model aircraft. Can you say anything about its strength to weight ratio? How does its tensile and compression strength compare with polystyrene?You said something rather concerning in the instructions - "Mold can be dangerous, and is difficult to get rid of once it starts". Could you expand on that? I know dry rot is a real problem in houses, and if anybody unwittingly introduced something like that, he might regret ever experimenting with it. Then you say "if this happens to you it is usually a sign that you should start over" I would have thought it might be more appropriate to say "if this happens to you it is usually a sign that you should get your house on the market as quickly as possible",

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  • zanod commented on ludektalian's instructable Speed HeadUp Display1 year ago
    Speed HeadUp Display

    How distracting is this at night? I realise that LEDs can be dimmed, but how does it work out?

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  • Custom Painting a Motorcycle Tank (with Aerosol Cans?!)

    My brother did one about 50 years ago. He sprayed the tank white, then stretched lace over it from an old lace curtain, and sprayed it black, so the black went through all the holes in the lace. He then clear-lacquered it all and polished it.It gave the appearance of white lace on a black tank - and the result was stunning.

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  • zanod commented on felipemundy's instructable Integrate ArduinoISP and Atmel Studio1 year ago
    Integrate ArduinoISP and Atmel Studio

    felipemundy - In the end result, the -F wasn't a problem for me either - it turned out to be something different, but when I went to AVRfreaks for help, one of the guys noticed it in about 50mS, and flagged it, then they all started discussing it. They have seen it pretty often as a cause of problems.AVRdude takes a bunch of parameters from the command line, among which is the chip type. When AVRdude looks at the target chip, it reads its signature, which is a 3-byte number, and compares it with what it should be according to the chip type in the parameters. That way, it avoids destroying chips if you have accidentally put in the wrong type. If, however, you have put a -F among your parameters, it ignores the result of the test - though I think it still logs something to the screen....

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    felipemundy - In the end result, the -F wasn't a problem for me either - it turned out to be something different, but when I went to AVRfreaks for help, one of the guys noticed it in about 50mS, and flagged it, then they all started discussing it. They have seen it pretty often as a cause of problems.AVRdude takes a bunch of parameters from the command line, among which is the chip type. When AVRdude looks at the target chip, it reads its signature, which is a 3-byte number, and compares it with what it should be according to the chip type in the parameters. That way, it avoids destroying chips if you have accidentally put in the wrong type. If, however, you have put a -F among your parameters, it ignores the result of the test - though I think it still logs something to the screen. I believe that in rare cases, you can get a processor that has a corrupted signature, in which case, you can still program it by using the -F - but it should only ever be used in a one-off situation.

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  • zanod commented on felipemundy's instructable Integrate ArduinoISP and Atmel Studio1 year ago
    Integrate ArduinoISP and Atmel Studio

    When I started in AVR processing, this article was very helpful - but also costly, as I have just lost 4 ATtiny85's as a result of it. I went to the guys at AVRFreaks to ask if they were recoverable, and they immediately picked out the "-F" in the parameter string to AVRDude, which is a frequent cause of questions to their forum.See the thread at http://www.avrfreaks.net/forum/my-at85-bricked-can-it-be-recovered#comment-2309006I was asked to update this thread with the following (from them)..."WARNING! Never, NEVER, use the -F switch unless you know exactly what you're doing and understand the possible consequences. The -F switch incapacitates checks that you've selected the correct AVR model, and results in AVRDUDE "blindly" programming your chip as if it was ...

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    When I started in AVR processing, this article was very helpful - but also costly, as I have just lost 4 ATtiny85's as a result of it. I went to the guys at AVRFreaks to ask if they were recoverable, and they immediately picked out the "-F" in the parameter string to AVRDude, which is a frequent cause of questions to their forum.See the thread at http://www.avrfreaks.net/forum/my-at85-bricked-can-it-be-recovered#comment-2309006I was asked to update this thread with the following (from them)..."WARNING! Never, NEVER, use the -F switch unless you know exactly what you're doing and understand the possible consequences. The -F switch incapacitates checks that you've selected the correct AVR model, and results in AVRDUDE "blindly" programming your chip as if it was the one you've selected on the AVRDUDE command line. If it actually isn't (e.g. you've made a typo on the command line) then it might render your AVR "bricked" (impossible to program) and hard to resurrect from that state, possibly requiring a "parallel programmer" (a quite rare type of programmer these days - your programmer most likely isn't one of those).REPEAT: Never, NEVER, use the -F switch on the avrdude command line. If you're having trouble programming your AVR then there is a fault somewhere and -F is not the solution!Also, see http://www.nongnu.org/avrdude/user-manual/avrdude_...for the command line parameters.

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  • zanod commented on happydupa's instructable Inexpensive Garage Lights From LED Strips2 years ago
    Inexpensive Garage Lights From LED Strips

    I have seen many negative comments on the web about low cost Chinese LED lights, and my own experience has not been good. I bought eight 240V LED light bulbs (replacements for bayonet incandescent down-lights) in the fond belief that they would last a very long time. Within a couple of months, two of the bulbs failed, so for the sake of getting matching bulbs, I ordered four more. Now, a year after initial installation, a total of five have failed, so I have seven of the Chinese ones and one local replacement from the hardware store. The Chinese ones are cold white, but I was unable to get a colour-matched one in the UK.The bulbs are completely glass-encapsulated, so I can't get into them. They contain a matrix of 60 LEDs, and each time one has failed, it has been a single LED, but...

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    I have seen many negative comments on the web about low cost Chinese LED lights, and my own experience has not been good. I bought eight 240V LED light bulbs (replacements for bayonet incandescent down-lights) in the fond belief that they would last a very long time. Within a couple of months, two of the bulbs failed, so for the sake of getting matching bulbs, I ordered four more. Now, a year after initial installation, a total of five have failed, so I have seven of the Chinese ones and one local replacement from the hardware store. The Chinese ones are cold white, but I was unable to get a colour-matched one in the UK.The bulbs are completely glass-encapsulated, so I can't get into them. They contain a matrix of 60 LEDs, and each time one has failed, it has been a single LED, but they must all be in series because when it happens, the bulb goes dim. I hope you have better luck - though you can.at least, replace short sections.

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  • zanod commented on ThomasVDD's instructable Hard Drive Sander2 years ago
    Hard Drive Sander

    Anybody got an old IBM 3330?

    When you're running up the motor on a RC model, you always start from zero throttle then increase it. As you increase the throttle, the frequency sent to each winding increases, and the motor ramps up its speed. Maybe the motor just follows the frequency. Is there any feedback from the motor to the ESC to tell it the speed of the motor? There are only three wires. So if you tried to spin the motor initially with a frequency equivalent to running speed, it's quite possible the motor wouldn't turn.

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  • zanod commented on BrotherJames8765's instructable Cheap Solar Panel for Under $302 years ago
    Cheap Solar Panel for Under $30

    "the cost will never provide a benefit over buying electrical power off the grid"... so all these huge solar farms covering hectares of land, are running at a loss?I don't think so.

    When speaking about sealing the panels in plastic, you say "compared with the trade off of weatherproofing, which enables one to take the panel into real sunlight, I thought it was worthy". Does this indicate that sealing them in plastic precludes taking them into direct sunlight? It's confusing, because you later speak about using mirrors to focus more sunlight onto them.How hot can they get in direct sunlight? It should be noted that items assembled with hot-melt glue will come apart if left locked in a car in Summer.

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  • zanod commented on felipemundy's instructable Integrate ArduinoISP and Atmel Studio2 years ago
    Integrate ArduinoISP and Atmel Studio

    It's not working for me. My project is called "Reg2Scope", and the hex file is called "Reg2Scope.hex"When I try to send the file to my target (ATtiny85), everything seems to work ok - the fuses are written etc, but it fails when trying to write "main.hex" - which doesn't exist. It appears that $(ProjectDir)Debug\$(ItemFileName).hexdoes not substitute the right name.BTW, I'm using the currently-available Studio-7. Your instructions were written for Studio-6.

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