I was on DXSoul.com buying some more of the USB LED lights (see photo). I noticed they have these OBD2 Bluetooth diagnostic tool devices for less than six dollars. I thought about buying one, but then I thought about some of the ramifications of using one. They are great because the device eliminates the wiring
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Read update at the end first. I was searching for some regenerative receiver schematics and looked at some other circuits. Google says similar images, but it doesn’t know anything about the purpose of the image, it just knows that it has lines connecting different symbols, and even then I’m not sure if it even knows
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I was considering what I would do if the electricity went off and I needed to solder something. I was on YouTube and I watched a guy make a battery operated soldering iron from copper wire, part of a telescoping antenna, wood, fiberglass sleeve tubing, some 0.2mm nichrome wire, and battery and holder. The video
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The LCD on my digital thermometer faded away, so I knew that it needed to have the single AAA cell replaced. I bought the indoor/outdoor thermometer probably more than two decades ago from Radio Shack. This time, I removed the AAA cell and I had marked it as installed in Nov of 2005, so it
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I was coming back from lunch, walking through the parking lot of the shopping center across 17th St from the college. I saw Pat Ewing also walking several rows away. We were both headed for the crosswalk at the front entrance of Santa Ana College. All of a sudden this pickup pulls into the parking
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I ordered a few toroid cores today, and I used this toroids.info to find the turns and inductance for some cores. It has a basic calculator that can give the information for the cores in the list. Most of the cores were chosen for RF projects, so some very large cores are shown. The T
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The thought comes to mind about why do the scanners at the checkout counters use a red laser light to illuminate the UPC barcodes (history and technical data here). I can point my phone camera at the QR codes on advertising and it will read the ‘barcode’. The camera doesn’t need a laser, it just
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I got this Bad Science book by Goldacre last week, and I’ve been reading it. It was published about a decade ago, so some things have since changed. It is a paperback book. He points out how the pseudoscience supporters go about this, and the mistakes in their logic.
I wander the Internet and often collect schematics of things I want to learn more about, or want to build. I have generated many hundreds myself, many of which I have built. I must have thousands, and hundreds of megabytes of them on the PC. I just put them in folders inside of folders and
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I’ve been looking online at the Next Thing Co. C.H.I.P. $9 Computer, also at its wiki. It looks like a real good deal. The R. Pi is more expensive, but either computer by itself is only a fraction of the cost, because both of these require external stuff, like a keyboard, mouse, monitor, power supply,
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