The Expanse is being turned into an RPG | 220v Contactor Relay

If you enjoy people photography and delight in taking photos revealing real character and emotion, get yourself a Sony A33 and a large memory card, set the camera to high-speed continuous mode, and let fly. You’ll be amazed at how much more intimate and impactful your photos become.

The LCD improvement I found most the most dramatically useful was the brightness settings. Set to Auto brightness, the camera will brighten or dim the LCD display in response to ambient light. This helps a good bit in bright daylight, but the display still washes out in direct sunlight. If you’re shooting in bright sun, though, check out the Sony A33′s "Sunny Weather" LCD brightness setting. Wow – That’s a really bright display! It does blow out the top end of the display’s tone curve (that is, you won’t see any detail in the highlights in your images in this mode), but this is the first time I can honestly say that I had no trouble viewing a camera’s LCD screen in direct sunlight. It’s a really great feature, although I’m sure it further reduces the Sony A33′s already-short battery life.

I thought “residual current circuit breaker” was just the European name for what we call a GFCI in the US.

Just reach for the “Flame Wrench” while working on a press, in a corrugated box plant. Within the next two minutes, you’ll know how many fire extinguishers are in that building. Box dust and the old, grease based, Letterpress ink was always a major concern when you were doing the repairs and needed to use a grinder, torch or welder, etc..

• Circuit conditions such as the peak voltage and current during the surge event • The MOV continuous operating voltage (should be at 20% above maximum system voltage under normal conditions) • The number of surges the MOV must survive • Acceptable let-through voltage for the protected circuit • Any safety standards with which the circuit must comply

To take it a step further, I’d take the time to measure the amperage on the circuit. I wrote a blog post dedicated to that topic, titled Using an infrared camera to find an overloaded circuit. Many home inspectors are opposed to doing this type of test, and I say those home inspectors shouldn’t bother scanning an electrical panel. If a home inspector isn’t going to measure amperage, I don’t know how they could report on an overloaded circuit.

There is a reason SSRs come with four bolt holes and a wide, flat aluminum base. And a reason manufacturers use these large heat sinks on them, and don’t forget a thin film of thermal paste:

Copyright © 2018 Media Data Systems Pte Ltd (Singapore Co. Reg. No. 199001601W). All rights reserved.

Rather than rest after establishing products in every major sector of the interchangeable lens digital camera market — APS-C SLR, full-frame SLR, and most recently single-lens direct view — Sony is boldly striking out to create yet another category with the launch of its very first translucent mirror cameras. The main goal of the new design: achieving unprecedented autofocus and capture speed from an APS-C sensor, interchangeable-lens, consumer digital camera. Comprising a new SLT series, the Sony Alpha SLT-A33, A55, and A55V are closely related cameras sharing the same basic design, with only a few internal features as major differences.

Temperature swing in the water heater may be about 50K, incandescent bulb filament temperature swing is closer to 3000K. I doubt there is much variation in the resistance of the water heater’s heating element

Alternatively, the stillborn 42V automotive power standard is another solution. http://en.wikipedia.org/wiki/42-volt_electrical_system

About 20yr ago I changed the big noisy (*) contactor for the 400V/3 phase 1kW pool pump to a 4 pole relay similar to this one: https://www.reichelt.at/Industrierelais/FIN-55-34-8-230V/3/index.html?ACTION=3&LA=2&ARTICLE=13324&GROUPID=7622&artnr=FIN+55.34.8+230V&trstct=pol_4 because of the noise it made. It makes small sparks at the contacts, but is switching every day in summer since 20yrs. If there is no cleaning work to do, the pump is only switched one cycle per day by a timer. So, maybe 2000 or 3000 switching cycles is not much for a relay, but it is sufficient. And even if it would burn out now, it had a 20yr lifetime. *) the loud “clonk” when it pulled in and sometimes humming from the coil. That disturbed my father sleeping in a near room. We do not need remote control, it just has to work.