The easiest way to revolutionize your computer’s audio | Lrd12 Overload Relay

In cases of energy shortfall, we could apply 3% or 6% voltage reduction from our central control, to shed load. (along with asking manufacturers to reduce load, part of their contract) Before real load shedding, switching off supplies. I know. I was a control engineer. Admittedly a few years ago

You also have cables running from the power distribution system and over to the servers, if we halve the current in these lines, then we quarter the power dissipation in these cables. This is both true for the power cords, and for the internals in the power supply as well. At least for the “AC” side of it.

“I don’t think” – hehehe I’ll agree with that. My utility company provides 3rd world electricity in August. Most days the juice drops to 103 without anything on in the house. I’d love to have as much as 110. Fortunately, the L1 car charger works down to 100, and the L2 stuff works at 187 – the lowest I’ve measured. 5 big reasons why the juice is so bad, but then I’m not paying for the loss, so its not a biggie with me. Just worry a bit about the refrig and freezer.

Oh well… That industrial relay has ‘almost’ the same contact ratings of a simple songle srd-05v sl-c relay (specifically the C form/single phase). But I’m sure it won’t last as long as 20y+ in such harsh environment.

This device – and any high-powered device that’s home-built – should be regularly inspected to insure that the wiring is not degrading due to heat caused by increased resistance. That’s why the chassis has a clear lid.

But at the end of the training it says “you can ignore all of this if you are troubleshooting”. If you are afraid of live circuits, stay at your desk where it is safe…

You probably knew that, so I apologize if I’m going over familiar ground, but for others, it’s worth mentioning.

I started my hacking adventures decades ago with vacuum tubes and high voltages, and have to say that this is an excellent and important article. I’m not sure of the country of the author, but one piece of translation for those just getting started. The “Residual Current Circuit Breaker” here in the U.S. is called a “Ground Fault Circuit Interrupter”; but, provides the same protection. Another more recent protection innovation is called the Arc Fault interrupter and actually contains DSP type circuitry to determine if a dangerous arc is present on the line. Flipping a light switch or running a small motor creates an arc; but, the AFCI can tell the difference between that source and a frayed power wire that could overheat and start a fire. The largest voltage I’ve ever worked on was an amateur radio linear amplifier that ran 2600 VDC @ 600 ma for the finals, which brings me to the main point of this post. One additional rule: Always keep one hand in your pocket or one finger hooked in a belt loop. While it makes handling equipment more tricky, it keeps the power from having a path across your chest, which is also across the heart and lungs, which are electrically operated and can be severely damaged or stopped. BTW, I love the image of the sign/sticker in this article which hit’s the nail right on the proverbial head.

Steady in the dark. The Sony A33′s Handheld Twilight (HHT) mode uses multiple shots and micro-alignment to permit handheld exposures even in very dark conditions. This was a very dark bar scene, but the shot came out sharp enough for a 5×7 print. It could have used some exposure adjust and (definitely) a different white balance setting. Exposure is auto-only in HHT mode, but the similar multi-frame NR mode gives full control.

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

User interface. Sony has retained a similar menu system in the Sony A33 to that previously featured in the Alpha series DSLRs, but incorporating the new database-driven Playback mode from the NEX-series SLD models. The user interface of the Sony A33 is generally clean and easy to understand, with the one major exception being the rather arbitrary segregation of still images and videos in playback mode. Switching between viewing stills and videos requires the user to either enter the menu system, or zoom out to the thumbnail view and select the appropriate tab. Neither option is immediately obvious without reading the manual, and photographers unfamiliar with the interface might believe they’d accidentally deleted the unavailable media, not realizing they were simply in the wrong viewing mode.

“Normal” mains voltage heating elements use nichrome (nickel chromium) some time called “resistance wire” because it has a higher resistance for a given surface area.