River Bank is the stackable battery for everything you power, everywhere you go | Circuit Breaker Parts

Full-time autofocus. There are several advantages to the use of a translucent mirror in place of a traditional single-lens reflex mirror mechanism. The Sony Alpha A33 uses the design to allow it to simultaneously provide a live view feed with full-time phase detection autofocus. Most of the light is transmitted to the image sensor, while a smaller portion is delivered to the phase detection AF sensor, where it can be used to perform focus adjustments — even during live view, high-speed shooting, and movie recording.

Second was with an old (illegal) CB amp that I was converting to HF, and I touched an unshielded feed inductor of some sort, the aftermath from the RF burn was worse than that time I grabbed the wrong end of an iron with my fingers.

The plug-in Kia Niro has an 8.9 kWh battery (vs. 1.6 kWh in the regular car). You can quickly estimate the amount of kWh you used in the week as long as the battery was fully drained every time you plugged the car in (it’s fully drained if the gasoline engine kicks in) and you know how many times you charged the car.

Yup. Isolation is important as other commenters have noted. I’d compare electric heating pad design too, and probably require a door interlock to cut power to the bed when the door is open (enclosed only). A simpler way may be to simply put a transformer or “dirty” switcher under the bed and not put the higher voltage into the build plate in the first place. Use either a digital on/off for the switcher or a ZVS SSR for the transformer high side control. Would a 1/100 or 1/120 of a second minimum duty cycle and lsb affect the temperature that much, given the thermal mass of the system?

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.

On the positive side, the mechanism does allow the LCD to be folded facing inwards, providing some degree of protection against minor knocks and smudges when traveling and when you’re content to use the EVF instead. The Xtra Fine LCD panel has a 921,600-dot resolution. The display also uses Sony’s TruBlack technology, which couples a reinforced glass cover plate with anti-reflective film, and a resin filling that removes the air gap beneath the cover plate, which the company says improves contrast and reduces glare under harsh sunlight.

Heating is a function of power loss, which varies by the square of the voltage drop and inversely with the resistance. Current is a fallout of the voltage drop across the resistance. While typically stated as I*I*R losses, getting that “I” to be a big number with a low input voltage means that R has to also be low, which decreases power. Requiring a low R for the heating element magnifies the power losses in the rest of the circuit, where heat isn’t desired.

Or the other takeaway is that only some piece of esoteric surplus made several decades ago is the right thing for the job and then one can go have a philosophical crisis about whether at this point we’re just plundering the ruins of a failed civilisation or not.

Semiconductors can fail, and when they do, they often fail in ways that make conduction paths that otherwise should not exist. Mix that with high voltage power and you’ve got a recipe for disaster.

Interesting how both the sounds and the letters on a QWERTY keyboard for V and B are close enough that it’s possible to switch them by accident.

PCB coatings seal off remaining PCB contaminations and go some way to reducing the presence of future contaminations that may promote water condensation. That is all PCB coatings do! There is no point coating over solder connections as these may be re-soldered in service. Even a coated PCB will have condensing water at very high humidities and favourable temperature differences.

Retired engineer, 71 years young. Computer builder and programmer. Linguist specialising in language acquisition and computational linguistics. Interested…