Författare: jenslabs.com
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How to repair a Samsung LE40M87BD LCD TV
The other day my TV suddenly turned itself on. I turned it off again, but sure enough after about 30 minutes it was on again. It didn’t take long before the TV was unable to start at all. When I pressed the power button, the TV started to click and the red status LED flashed.…
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What can you cut with a 300mW DIY laser cutter?
I built this laser cutter after being inspired by this laser cutter and the design is almos identical, there for I will not go into details about my build but will instead focus on what you can do with it. Since the diode (LPC-826) I have used is from a DVD burner and have an output power of…
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Ketosense – An Arduino based ketosis detector
In this post I will go through the hardware and software of the instrument I have made. If you are curious to why I have made it, I would recommend that you start reading the other posts I have done about this project and work your way forward. Just click on Ketosis detector under categories.…
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El-Wire
Yesterday I received some EL-wire I had ordered. If you don’t know what EL-wire is it is a plastic coated flexible wire about 1 mm thick that glows with a neon glow and runs of a small battery pack. I have not figured out what to use it for but I was curious about it…
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DIY graphene videos
In the recent days videos from people who actually made some DIY graphene has started to pop up on youtube and in this post I will introduce you to a few of them. Robert Murray-Smith One of the very first people who I think deserves a mentioning is Robert Murray-Smith. Robert is a MacGyver of DIY…
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Calibrating a Figaro TGS822 sensor, by drawing…
After consulting with the boys and girls at chemicalforums.com about how to produce an ethanol gas with a 300 ppm without having to buy a lot of fancy gear and thus finding out that it was more difficult then I initially thought I have reluctantly decided that I don’t think I will be able to pull…
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Hi, I’m Ketosense
During the weekend I have managed to put together a first very early prototype of my ”Ketosense”. It does register when a person is blowing in to the ”gas chamber” where the sensor is located and something that feels encouraging is that my wife gets significantly higher readings then me. Since I’m still a carbohydrate…
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Measured sensor characteristics MQ-3 and TGS822
The 48 hour burn in of both sensors has now been completed and I have been able to do some initial measurements of the sensors characteristics. So far both the sensors does seem to react to acetone but that is not rely surprising. The sensor resistance range (Rs) does vary a lot between them, the…
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DIY Graphene
I came across a much inspiring video about some scientists at UCLA who successfully made some graphene and using only commercially available equipment doing it. After watching this I just had to look in to what it would take to make some graphene and perhaps a super capacitor or two of my own. Graphene is a fascinating material and…
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The sensors has arrived
Yesterday the sensors I had ordered arrived, I had ordered the Figaro TGS822 and the MQ-3 from Hanwei Electronics. Since this type of sensors require a burn-in of 24-48 hours I wired them and applied some power. I had a suspicion that the sensors were actually going to be identical in function but perhaps I was wrong since they…
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