Pass Laboratories XA200.8 monoblock power amplifier | 19mm Momentary Push Button

I also seen a technique where a relay is placed in parallel with the zero crossing triac so the triac is only passing the load for 200ms or so while the relay switches. Since the triac is on longer than the relay, the contacts don’t arc over when switching, and the traic doesn’t pass the current all the time.

I’m constantly amazed by the use of a giant blob of solder to increase the cross section of PCB traces meant to increase their current carrying capability.

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Europe is a real patchwork of degrees of sketchy. German wiring standards are very high indeed, at least in the semi-industrial places (laboratories, hospitals) I worked. The real Schuko plug/socket design is quite nice and safe, and hard to find *not* implemented correctly in Germany. Other countries, not so much. And don’t get me started on English and South African wiring and plugs.

The risk / reward ratio just doesn’t seem worth it to me, when it’s so easy to have an intrinsically safe low-voltage one.

Ultimately under-rating won’t solve the problem. The Chinese scammers are already putting below-rated parts in, because they assume most users will under-rate anyway, so they’ll get away with it. If, in response to that, you under-rate even more, and this becomes mainstream, what do you think will happen? They’ll just take it into account, same as ever, and the 75A parts you’re putting 40A through, because you want to be careful, will only contain 20A triacs.

Capacitive or Resistive Voltage Dividers are not really an option for this device since the ESP8266 draws a relatively high current. You would have a high power dissipation (resistive) or a VERY large capacitor. A more complex design or a small transformer has to be used here.

A clean filter is vital to a well-functioning air conditioner. During the summer it is good to check your filters once a month. If you have pets, leave windows and doors open, or have allergies, you may need to change your filter more often.

If you do not know the exact value of each cost, you could enter an estimated percentage based on the cost of goods.

ead of single layer traces covered by the paint, what about multilayer PCB? So the traces would be embedded between two FR4. This way it would be safer.

It’s not all a bed of roses with video and live AF on the Sony A33, though. While it tracks action very well, focus actuation with the kit lens is far from silent: In anything but a very loud environment, the "chock… chock" of the lens’ focus operation is painfully apparent in the audio track. Even with the ultrasonic motor-equipped Sony 70-200mm f/2.8G lens attached, focus noise was quite audible in quiet environments. Another really annoying (and entirely avoidable) audio artifact is the loud click that’s recorded at the very end of each video clip; the sound of your pressing the video on/off button to stop the recording. I experienced this with the NEX-5 as well, and it honestly seems like a bug to me.

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