Larson Electronics LLC Releases Portable 75 KVA Power Distribution Station with 2 520R-GFCI Receptacles | Lrd12 Overload Relay

We’ve seen very few car charging hacks. If you know of one, or have been working on your own, let us know!

We must also remember that just because an item is unplugged and may also of not been plugged in for a few days it can still hold a big charge in the electrolytic capacitors. Back in the 80’s I used to work for a service department in the uk called Vallances. When working on tv’s with a crt I found that crt screens that had not been plugged in for a week or two could still hold a big charge and the first thing I did was to short the tube to discharge it. I also remember one of the older engineers working on an old valve radio which was unplugged at the time, suddenly there was a bang and a big cloud of smoke and a very stunned engineer. All I an guess is that an old electrolytic capacitor was shorted and exploded. So remember when something is unplugged it can still be very dangerous, more so with microwave capacitors.

I actually also just added remote control to my pool, using a Sonoff 4CH pro. In my case, I have 3 devices I want to control. The pool pump itself, a water feature close to the pool, and the pool lighting. I also incorporated a flow rate sensor into the pump to make sure that the pump was not working too hard (as can happen when there is too much debris in the pool weir basket!). To drive the flow rate sensor, I tapped into the 5V supply before the 3.3V regulator, as the sensor was specced to run on 5V-24V, or thereabouts. I also inserted a level converter in between the flow rate signal and the Sonoff, even though it should be OK with 5V. I didn’t feel like taking chances.

Halogen lamps hate being run at substantially less than full power! The additive (bromine or iodine) is used to keep the inside of the bulb clean and regenerate the filament, but it corrodes the filament if it’s not hot enough.

Lenovo’s previous ARM-powered device was a 2-in-1 detachable tablet / laptop hybrid, but the new Yoga C630 is more like a traditional laptop that also flips over to become a tablet in the traditional Yoga style. Because it’s more of a clamshell-like laptop, you also get a polished aluminum design, and the build quality you’d expect from a laptop. Lenovo is equipping the Yoga C630 with a 13.3-inch FHD IPS touchscreen that also supports an optional stylus. There’s 4GB or 8GB of RAM, and 128GB or 256GB of storage. Ports include two USB-C and a headphone jack.

That’ what I was thing one simple resign feature could make it as safe as most electrical appliances. Assuming heating element isn’t subject to contact. For me the phonographs weren’t clear in that regard. .

I do not disagree that this is not the best way to do it. I have only used it for temporary installation, and only when I can frequently inspect everything involved for signs of elevated temperature. At home, I had a licensed electrician install a NEMA 6-50 and a 40A circuit (which we de-rate to 32A for EVSE service) in our garage for our car charging needs.

I adore the Gravity Blue finish on this tester — it’s a welcome change from the sea of grey, silver, and white that fills every damned parking lot. More blue/green here again.

When the cycling control opens, line voltage is taken away from the motor. The motor’s rotor decreases in speed. Thus, the back-EMF generated across the start winding decreases in magnitude. The relay’s coil now sees a lower back-EMF and no longer can generate enough magnetism in its iron core to keep contacts 1 and 2 open.

Would that have ever been considered good wiring practice, or is it just the sort of short-cut that would have been done at some point?

My testimony : 230VAC doesn’t kill if you’re lucky. Lots of people died on 230VAC (Claude François….)

Meh, just use a relay for your “PWM”. It’s much easier, and you have a huge low pass filter. You can easily go up to a few Hz switching with a good realy. Use a solid state relay and it’s even better (you might break your mechanical relay after prolonged use).