This is great info. In the next instalments I would love to see advice in dealing with a mains power supply and possibly a power line carrier modem on the same board or enclosure as low voltage components.
Tilt level. The Sony A33 includes a dual-axis level gauge, which helps ensure level horizons and prevent converging verticals in photos. The level gauge can be shown on either the electronic viewfinder or the rear-panel LCD, but only alongside the most basic information overlay — you can’t combine the detailed display overlays with the level gauge. A clever way around it, though, is to set one viewer to the level gauge, and the other to a more informative display, since by default you can set the display modes independently. There’s no way for the user to recalibrate the gauge, if they find the factory default to be inaccurate. The gauge is displayed in a style reminiscent of an aircraft attitude indicator, but with a separation of the roll and pitch indicators. When the camera is perfectly level, the pitch indicators and markings at the end of the roll indicator are illuminated in green.
You are right, FR-4 has a glass transition temperature of around 120°C, so if you heat up your traces above that, and take into account the mechanical stress from expanding copper traces, delamination is something waiting to happen sooner or later (especially if you design corners in your traces). Add to that the fact that you usually don’t measure the temperature directly on the traces to regulate input power, you could go way beyond 120°C in your copper traces. I don’t think a lot of DIY guys actually know that there would be high-TG materials on the market better suited for PCB based heater applications…
The plug-in Kia Niro has an 8.9 kWh battery (vs. 1.6 kWh in the regular car). You can quickly estimate the amount of kWh you used in the week as long as the battery was fully drained every time you plugged the car in (it’s fully drained if the gasoline engine kicks in) and you know how many times you charged the car.
Stone (Bronze?) Face Human facial expressions can be incredibly fleeting; High shooting speed can help in places you might not expect.
Your friend died of what and why? Testing mains voltage across the back of his hand? Please. Mains voltage is not scary if you know what you are about. I dealt with volts up to 132KV and mega amps and megawatts in my career I worked in the UK electrical power industry.
As an electrician (among many other things), I cringe when I see people acting like line voltage is nothing to worry about. I’ve seen photos and video of people who died gruesome deaths because they either failed to take the proper precautions or had no idea what they were doing when handling line power. I spent years training to safely handle electricity, and then spent another 15 years working with it in industrial, commercial, and residential settings. Despite all of this experience, I still have a healthy respect for electricity, which has probably saved my life on more than one occasion.
Sweep Panorama mode makes shooting panoramas easy, but not entirely brainless: It often takes me a few tries to get just the shot I want. The camera throws away a fair bit of the image area top/bottom and left/right, to insure that it has enough room to get everything aligned properly, despite your having angled the camera or not having swept perfectly horizontally or vertically. Sometimes, you can end up with your main subject higher or lower in the frame than you’d anticipated. It’s also easy to get a tilted horizon, if the camera orientation or your sweep direction is a little off. I found the A33 and A55′s level indicator and viewfinder gridline displays very helpful for avoiding these problems, although there was a little learning curve for me to make effective use of them.
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If you had a mains-voltage shock once and got away with it, you were lucky, that doesn’t mean the voltage is safe, you were merely playing a game of Russian Roulette with Ohm’s Law and a low impedance high voltage supply. Your domestic mains can dump the hefty amounts of current your home heating, your cooker, or your electric kettle demands, so if it finds a low resistance path through you then it is going have no problems dumping whatever current Ohm’s Law allows it to through that path. The chances are if it happens to you the path will be a high enough resistance that you’ll only get a very nasty jolt and live to tell the tale, but if it’s not your lucky day the resistance will be low enough that you’re just going to sit on the end of it twitching until the power is turned off, whether you’re alive or not. That’s the gruesome truth. Mess with this stuff and you can die, end of story. You are responsible for keeping yourself safe, and this is not a joke. OK? Now to work!
I to have worked with high voltage systems. My point was that it needs to be treated with a bit of respect or it WILL kill you even if not immediately. My friend was an electrician of many years. And sure, I hear lots of stories of how people get away with this and that, but that is just that they gotten away with it so far. They could be dead tomorrow.
I use a contactor with my sonoff, 1kw pool pump. The sonoff is seriously under specced for switching a pool motor.
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