Wallpapers from The Verge | 19mm Momentary Push Button

Sometimes you’ll get a zap across your hand, maybe even a horrible burn. But I like those odds compared to you touched live and it routed current through your heart!

As someone who started playing with electronics in the days of B+ in the 350VDC range with double that across the main xformer’s secondary, I was utterly appalled at the idea of tying myself to a hard ground when working with some of the newer (for the time) solid-state stuff that was coming out. We had a respect for high voltage then that is often missing these days, this article is an excellent reminder that this is still needed.

My 2 stage 23 x 24″ CASE snowblower I home-made converted to a 3 hp extension cord electric (240 on the Tesla outlet – peaks at 35 amperes and 7 1/2 hp). I was worried that I had underpowered it but last March when all the gas blowers on the street were stalling on heavy water laden snow, mine just kept barreling down the sidewalk.

I know a lot of people that have never heard about “makers” but I wouldn’t trust them near any mains wiring – like my own dad who has wired a circuit breaker between live and neutral. Only the ensuing BANG and my mom’s swearing and yelling from the now dark kitchen have disabused him of the idea that that is how it should be done.

Just took a few seconds? the speed of light must be a bit slower in whatever dimension you’re living in.

But they’d have to be in the same phase for it to work. If they’re in opposing phase, they’ll just push and pull against each other.

As a result I wrote this article in 2015 outlining the issue, what I did to ID the problem and the solution.https://www.instructables.com/id/The-inner-workings-of-Counterfeit-FOTEK-SSRs/

Interestingly, I didn’t notice the unusual size of Sony A33′s viewfinder display when I first picked up the camera, but I became acutely aware of its loss when I switched back to a conventional sub-frame DSLR after having shot with the Sony A55 and A33 for a day or so. The conventional DSLR suddenly felt I was looking down a tunnel, and I also found myself greatly missing the richness of the A33′s viewfinder information overlays. The excellent image quality of the Sony A33′s EVF did a lot to win me over to the idea of EVFs on interchangeable-lens cameras, but it was the combination of image size and informational richness that really put me over the top. Because it could appear right there in the viewfinder, rather than on the rear-panel LCD, I was surprised to see how much I came to rely on the electronic level display for keeping my landscape shots straight when there was no obvious horizon line.

Take a look at the Lennox air conditioning condensing unit tag on Page 19. Notice that the MCA is 28.6 amps and the maximum fuse or circuit breaker is 50 amps. This means it is allowable to install this unit on a circuit breaker rated at 50 amps and a conductor rated at 28.6 amps, according to the NEC’s NFPA 70.

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).

But at the same time, if one wants a high efficiency power supply, then the manufacturer typically have placed in a rectifier that is technically over specified for the job, as these devices are generally not that expensive, and are an easy way to cut down a few watts overall without adding any substantial extra cost.