Charting the S&P 500’s range-bound, but bullish, (unofficial) summer start | 220v Contactor Relay

Not sure where did you get “…A quick looks shows BT137 will burn 20W to switch a 5A load…”. BT137 has the following listed: On State voltage (Vt) @It=10A is 1.3V, max 1.65, so the worst case is 16.5W, more realistic 13W. Not to laugh at, but still not close to 20W

Why do the US still use 110v mains and 20A room circuit breakers? Those currents are dangerous, not the volts.

Please define “chicken stick”. Your story reads as if you were putting state-fair-food into your electrical equipment.

Now that’s something … And for other commenters: of course exposed mains voltage is dangerous, lethal even. But why would it need to be exposed? It could be made like Davic’s hack, or in countless other ways that are safe. Hide heating element under thermal mass, use secure connectors and proper grounding.

Some heaters are a coil of Alloy wire cast in ceramic and then enclosed in a stainless steel tube. Basically a bad inductor, but still having the surge properties of one. Same with big boy halogen bulbs.

But I don’t like the mains powered heater in this case: If you take 120W @24V its just 5A. No problem for a switching transistor or wires with 0,5mm² and you keep the mains voltage in the PSU box. Which I prefer in this case. Mains rated cabling (230V here in Europe) are not thinner and need thicker insulation. In the worst case you have to have PE connection to any metal part of the construction.

Path: All Categories >> Electronic Components >> Electromechanical Components >> Switches >> Vandal-proof pushbutton switches – Update me on new products View latest products

400 Hz is the frequency of choice for aviation. That’s why the PA system in airplanes has *that* particular background tone in it.

The Sony A33 offers a lot of control for shooting contrasty subjects. Dynamic Range Optimizer (DRO) adjusts contrast and brightness to optimize the camera’s use of available dynamic range. Auto HDR modes use three quick shots to cover an amazing tonal range. (The shot on the right represents the maximum range of 6 EV.)

It may be just perception coloured by the general work environment, but a lot of the US regs seem driven by liability concerns. Too many lawyers.

We drive about 30k miles/year, lots of long trips. After a trip, we usually pull in with 25-50 miles of range remaining. No problem – charging to the normal 80% is < 7 hours.

Don’t those wild & crazy Brits use “electrocution” to include a non-lethal shock? Our friend [Moryc] could have learned English from Britlish speaker, as he mentions that he’s not a native speaker of our bastard tongue (though, he could have fooled me with that delightful prose).