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Fitbit Connect and Mac OS X (10.11, El Capitan)

2016/05/29 By staze

img_1199-1.jpgUPDATE: They have since updated the Fitbit Connect app to work with El Capitan. So, things actually work now. Below is the original message.

——

As several posts have indicated, and my step tracker that’s on the right of my site show (though it’s been kind of lacking in data for the reason outlined below), I’m a Fitbit user and fan. But, since late September of 2015, since the introduction of Mac OS X 10.11, the Fitbit connect app, which handles syncing of the Fitbit via their dongle, this hasn’t worked reliably. Any reboot results in the dongle being lost by the software. Unplugging and re-plugging sometimes works, but sometimes results in the computer slowing to a crawl until you unplug again. Any either way, rebooting breaks things again.

[Read more…]

Filed Under: Apple, Miscellany Tagged With: fitbit

Amscope SE400-Z Review

2016/05/16 By staze

Amscope SE400-ZAfter moving my workbench, I’ve been buying tools that I couldn’t otherwise have used in my old space. One of the last things I needed was a stereo-microscrope for doing SMD work. Some looking around quickly pointed me to the Amscope SE400-Z, which gets great reviews, is affordable ($185 on Amazon as of today). I had a bunch of Amazon credit, and rewards, to I used those and the total was only $115. Two days later, Ontrac delivered the scope in a pretty small, but weighty, box. The unit goes together quite easily (especially if you’ve seen pictures, or any reviews online). The manual, for whatever reason is password protected from download, but the access code was on the side of the box rather than in the included pamphlet. The manual, however, is pretty useless.

The scope as a whole is quite nice. I’m haven’t used for much SMD re-work at this point, but it seems like it should work very well for everything I might do. While a continuously zoomable scope, on a boom or arm would be nice, but I don’t really have a good space for one and didn’t want to spend the $500+ for one. =/ Same goes for a trinocular (camera) port.

The base of the scope is pretty stout, but could be a bit heavier. It’s ferrous, so you can slap a magnetic parts tray to it, and put screws, etc in that. The gooseneck light is great, and allows for moving the light to just the right angle to see SMD markings (which are often laser-etched, and aren’t legible in direct light). I do use the microscope without my glasses on, and it looks very clear. The working distance is great, but I will need to figure out a good working surface for some boards since they don’t always lay on the bench “flat”, or study enough to allow soldering. Which is my only complaint. Although the working distance on the unit is very good, I do wonder about any kind of clamping I’ll have to do on double-sided boards. I may need to invest in some low profile clamping (either something cheap like this, or a couple Hakko Omnivise‘s).

The scope does sit on my bench well enough that I can use it seated from my stool. My bench height is 33 inches, and I’m medium height, so it should work for most people. Rough focusing for your working height is done by moving the horizontal arm height up and down, then fine focusing is done via the knobs. The optics are very good for a scope this price, and really made me realize the finish difference between the cheap eBay/Amazon tweezers, and the good WIHA ones I have. Yeah, I’m probably going to need more tweezers at some point. =/

All and all, I’d highly recommend at this time. It’ll be interesting to see how well it survives. It feels very sturdy, but I do have a toddler, so it will have to get that test. =)

[xrr rating=4.5/5]

UPDATE 1 (6/1/2016): I have since soldered a QFP64 package using the Amscope, and holy cow, it’s awesome. Previously, doing this by eye (and I have pretty good close up vision), it was a pain. I was basically drag soldering, then cleaning up the bridged pins, and then running a blade between the pins to make sure things were clear. With the scope, and actually being able to see the pins, it was MUCH simplier. What used to take 5-10 minutes of fidgeting, took maybe 2 minutes, at most? I’ll certainly never go back to unaided soldering of small SMD components again. =)

Filed Under: Reviews Tagged With: Electronics, Microscope, repair

Tektronix 2465 300Mhz 4-channel oscilloscope repair

2016/05/14 By staze

Tektronix 2465On a recent trip to Portland, I stopped by Surplus Gizmos, and found a used, as-is, Tektronix 2465 scope that had a calibration sticker on it saying “unit smoked while calibrating”. The scope was listed as $100, but I was able to get it for $60. I know the unit isn’t worth a ton, but it is a 300Mhz scope, and is seemingly considered one of the best Tektronix scopes ever (it’s also considered the last repairable Tek scope, as after this, most scope manufacturers stopped including schematics and other information with the scope). Also, the unit showed to have been manufactured around 1984, which is when my grandfather still worked at Tektronix writing manuals for scopes. So he may have very well worked on the manual for this scope.

Opening the scope up, I figured the issue was going to be the power supply, as that seems to be the common failure in this scope, and really any device of this age. The capacitors dry out, change ESR, overheat, blow, etc. Getting the fan off was really the hardest part of getting the power supply out, but once I figured that out (and broke the mandril holding the fan. =/) I got the PSU out, and quickly found the failure points ((Note, to remove the fan, you loosen the nut, then holding the fan “cage”, PUSH on the nut-screw toward the scope. That will push out the mandril and release it from the shaft. If it won’t release, please be careful. I got lucky and my mandril broke in a repairable way. I’ve seen pictures where they completely shatter, and there don’t seem to be any replacements available)). One of the caps on the low voltage side had ruptured, and also R1016 and C1016 on the mains input were both blown. There are plenty of online guides about re-capping this scope, but the only one I found with actual part numbers and quantities was here. His list is for the 2465B, but the 2465 is very similar as far as the PSU, the main difference is the lack of the SMD caps that everyone says to replace. Instead, there are three through-hole caps on the Digital board that you can replace.

[Read more…]

Filed Under: Electronics Tagged With: 2465, repair, Tektronix

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