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January 21, 2010
about 2 years ago
You forgot to add that they’re stackable. You can stack two or three together and get a larger bargraph. Old technology from the 80s or so. Popular electronics even had an article for a digital Spectrum analyzer using these..
News - Engineering Roundtable - …
about 3 years ago
What you did was dangerous. No fuse, Not hooking up to the switch side of the ignition And paralleling the heating pads, Is definitely dangerous. As others have said, The use of a fuse is absolutely Essential.. Also as others have said, it should be hooked to the ignition side of the switch, So if something does happen it will happen when someone is around. Not when it’s setting in your garage in the middle of the night when everyone is asleep. There should be a junction point under the dashboard to connect power to your device. Paralleling the heating pads is also a bad idea. It is one thing to run these pads on 13.5V+ on the bench. They have open-air to displace the heat. Putting them in a seat insulates them. The heat builds up quicker and could catch the foam padding on fire. A related example is when they used to use Knob and tube wiring In houses. 14gauge would carry a 20 amp circuit. When they started Insulating the wires there was no place for the heat to go so they had to increase the Size of the wire to 12gauge in order to keep them from overheating and catching the house on fire. Also you should not use solid core wired in Any automotive application. Vibration can cause the wires to break and short out. And the movement of the seat can cause it to break as well. Also do not twist the wires. Lay them as flat as possible and keep them from rubbing against each other when you sit down. When running it through the seat do not stretch the wires. Route them In a curve type pattern so they can move when you sit down. I have been doing this type of work since the 70s and if you were working in my shop you would be fired for doing that kind of work. There have been several incidents involving cars catching fire in garages and burning down the house and maybe killing the occupants. Keep your family safe and disconnect this garbage and do it correctly.
about 3 years ago
Interesting, how about adding conductive paint to it.
News - September Caption Contest
about 3 years ago
Caption: the owl with a Red Hat says, hoooo did that, hoooo just farted.
News - Enginursday - Three Child…
about 3 years ago
In the mid-70s, I was working as an automotive technician. Knowing that times was changing in the automotive industry. And that electronics and computers was going to be a big part of that change, I started studying computers and electronics. Most of my revelations was small and pretty insignificant. The most memorable was not a Revelation that I had, But one that I gave An engineer. At the time I was installing air-conditioning systems and they had just started using electronic thermostats. At first everything worked good, then we got a batch that would not cool. The thermostats was kicking off the compressor way too early. After trying every little trick that normally worked in failing I finally called the engineering department. From the tone of his voice you could tell he had a major problem, it seems they had learned about the problem and was having to design a whole new thermostat to fix it. He said I would just have to wait and it would take about a month to fix. I said is therenothing I can do to get this going. He said nothing, you will just have to wait. I said how about putting a resistor in line with the potentiometer or the temperature sensor. It got deathly quiet for several seconds I said will that work. He said in an excited voice yes yes. I said then you authorize the modification. He said yes do it. I promptly went down to RadioShack and purchased a potentiometer because I did not want to calculate the resistance value needed for the unknown circuit and several packs of resistors, Hooked up the potentiometer and match the resistance needed, measured it, and install the appropriate resistor. The next shipment we got had a resistor installed. I’m sure that the Modification saved the company millions of dollars in lost revenue and possibly lawsuits. That’s when I figured out, engineers are taught to think in a complicated manner. Sometimes you have to hit them over the head before they see the obvious. On the relay circuit above, a diode Would be the correct modification to prevent electrical shock. But turning the switch 180° in the circuit should also work.
News - Free Day, Lotteries, and …
about 4 years ago
Where I live, money actually has to change hands before it can be considered a lottery. If the chances free, it is not a lottery. I’m not a lawyer and have no idea how your state laws are considered, but if you give everyone a chance when they purchase to get their purchase free, “no money changes hands” in order to get this chance, then it should not be considered a lottery. The purchase amount on the product has not been changed in order to give the customer that chance. It is the normal price of the item. And if the window comes up stating you have received your purchase free before the payment screen comes up, then no financial payment would be requested. I.e. there is no fee aspect within this promotion.
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