The buyer’s guide to electric-car charging stations | 220v Contactor Relay

While we didn’t encounter any exposure accuracy issues in our lab tests, I had a little trouble with the Sony A33 and A55′s exposure system in the field. Under bright sunlight, I was generally shooting with -0.3 EV of exposure compensation dialed in. Looking at my photos on the computer later, it seemed that many of them really could have used -0.7 EV. The overexposure bias seemed fairly universal under bright lighting, regardless of whether the subject itself was low- or high-key. Shots under lower lighting didn’t seem to have the same issue, though.

Um, Though I live in Oz where we have 240 volt mains, I can see a big error in how it is explained. On, you get two different “phases” on th 110v side of things to increase the measured voltage.

Being small and shiny, it was an almost dead cert that a new engineer would pick it up, When tipped over, the relay would be energized by the tilt switch, the relay then switched off its own power, which resulted the contacts closing again, resulting in oscillation, and large back emf spikes which were presented across the two metal plates. As a result the person who picked up the box got a fairly significant belt, and let out some major expletives.

It can take 15 to 20 minutes for your air conditioner to get up and running after it’s tripped a circuit breaker or the power is turned off. Be patient and wait it out before trying something else.

I can see exploding TRIACs happening more often on cheap dimmers and such due to under-rating the load and little to no heat sink.

A final benefit of the EVF is that it lets you keep the camera to your eye during video recording, something no other SLR currently offers, although some SLDs do.

The customer changed their tune. My boss was impressed (though not enough to give me some coinage for ingenuity) and the electrician was told to change the breakers and add the new feeders to support the load. Got a lot of recommendations from that customer in the years after that.

Creating a PCB heat bed isn’t an art – it’s a science. There are equations and variables to calculate, possibly some empirical measurements by measuring the resistance of a trace, but Ohm’s Law is a law for a reason. If you do things right, you can make a PCB heat bed perfectly suited for the task. You can even design in safety features like overcurrent protection and fuses. It can’t be that hard. After all, your house is full of devices that are plugged into the wall.

The QD terminals I buy are not the crappy ones you get at Home Depot. I buy 10 gauge Molex AviKrimp ones from DigiKey. They’re ~33 cents each at Q:250. They are no joke. I use them in the high current path of OpenEVSEs that I build for up to 24A, and they perform perfectly.

Generally, most LED power supplies are a constant-current type, and are often referred to as LED drivers. These can be purchased as off-the-shelf assemblies containing MOVs to meet lower-level surge requirements.

I think this could have failed purely due to the inadequate heat sink, made worse by elevated summer temperatures. Add the possibility of counterfeits in, it was doomed to failure.

If you have a 3D-capable Sony television to view them on, capturing 3D images can definitely be entertaining. That’s about where I’d leave it, though: "Entertaining" vs "compelling." While you do get a reasonable 3D effect in shots captured this way, I found the quality of the 3D experience a little disappointing. Don’t expect Avatar-level 3D, this strikes me as more of a gee-whiz sort of feature: In my experience, the 3D effect is a bit limited, and foreground objects tend to break up visually. I suspect this has to do with the fact that the perspective is changing throughout the sweep, so things like effective intraocular distance and viewing angle aren’t perfectly consistent throughout the image. Whatever the cause, it’s a fun effect, but not something that would be a decisive factor for me in choosing a camera, whereas ordinary 2D sweep panorama is something that I’ve used often. (Personally, I suspect this feature has a lot less to do with selling cameras than it does with selling TVs: I wouldn’t buy a camera for the feature, but all else being equal, if I owned a Sony camera that had the feature, I’d be more inclined to purchase a Sony television that supported it.)