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You could make a multimeter that had an internal switch for volts / amps. But I think electricians wouldn’t trust it. So it’d be a useless feature, as well as, probably, increasing the shunt’s resistance. And be another point of failure somewhere dangerous. Etc! Nobody wants a multimeter that killed their mate.

You know very well, I hope, that for dimming you need to use a random phase optoisolator not a zero-crossing one. Like MOC3020/21 for example. This is in the command/trigger circuit for the Mains swiching Triac. Now show us your Relay driven dimmer beauty concept. Is good to learn something new everyday.

We’re pleased to report that the EVF in the Sony A33 provides better dynamic range than most, and does a decent job of preserving highlight detail in high-contrast scenes. The slight distraction caused by the "rainbow" effect is relatively easy to ignore most of the time. Sony specs the EVF as having 1,440,000 dots, of which 1,152,000 are effective in the viewfinder display. We believe that the company is following precedent here, by reporting a dot count as if each pixel constituted three separate color dots, rather than being time-multiplexed. If that’s the case, the actual pixel resolution would be 480,000 total pixels, of which 384,000 are effective in the final image.

TRIACs have very low junction voltage / resistance especially when compared to the load they are driving. When they are overloaded they heat causing the the junction voltage to increase rapidly causing exponentially more power to be dissipated by the TRIAC instead of the load. This whole process seems to take about a nanosecond and ends with a small amount of the plastic casing still attached to the legs.

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Also, if you leave your oscilloscope floating at mains voltage with an isolation transformer puts you in danger as all earthed parts of the oscilloscope will be floating at that voltage. Again: when things are floating, it is ok to have 1 fault.. but the second fault will definitely kill you or break something as no RCD will protect you.

For maximum resolution and shooting speed, plus built-in GPS, choose the Sony A55. Give up a little speed and resolution and drop the GPS, though, and you can save upwards of $200 with the Sony A33.

Does matter since he runs it on DC, even so the lamination are already welded at the factory, its how the transformer is assembled.

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This is very dangerous. Safety regulations are all about keeping mains voltage away from people, inside casings that are earthed or double-insulated. This has the voltage just lying there. Possibly covered with a bit of silk-screened paint. It’s not guaranteed to kill someone, but for the extra money I’d sooner have a non-deadly heater for a 3D printer.

In the case of an opto-couple my ‘rule of thumb’ is for the min to be the distance between the pads on left and right rows of pins. ie nothing under the opto at all apart from the pads connecting the pins.

The Chinese aren’t any more corrupt or corner cutting than any other manufacturing country ….. Since they are 3 1/2 times larger than the US then I’d expect to see 3 1/2 times more corruption and corner cutting …. It’s like CO2 output, yes China puts out more as a nation but per person the US puts out over 3 times more CO2 plus we had a 100 year head start which is why we are more responsible for the Global Warming problem (along with Europe) than China is by a considerable margin …..

We first saw this feature in Sony’s DSC-TX1 and DSC-WX1 in mid-2009. Since then, it’s been mimicked by other manufacturers, but none seem to do it as well as Sony. In Handheld Twilight mode, the camera captures up to 6 shots in rapid succession, micro-aligns them with each other, and then adds them all together. The net result is that you can hand-hold ridiculously long exposures and still get sharp results, with very low image noise to boot. Combine this with Sony’s SteadyShot image stabilization and sharp handheld photos at half-second exposure times are feasible.


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