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"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
As you get older you usually get fatter..
And the mechanism is simple, both your metabolism (resting energy usage) decrease and you appetite slightly increase...
"Problem" you have now, is your appetite is calibrated to your current weight and so it's going to be painful overeating...
However we have multiple appetites (there even was an interesting recent entry in new scientist about it) and modern snacks tends to confuse the brain into over eating, due to starving some appetite..
So my advice, eat a lot of unhealthy snack!
"Program testing can be used to show the presence of bugs, but never to show their absence." - Edsger Dijkstra
"I have never been lost, but I will admit to being confused for several weeks. " - Daniel Boone
I've powered my laptops from a DC to AC converter that output a modified sine wave without any problems. Typically the inverters that you can get that plug into the lighter adapter of the car, but also I have a small solar battery charging system that I've used for a battery backup in the past, again, 12 VDC to 120 VAC and plug the laptop supply into that.
From what I researched when I was looking at UPS'es a few years ago, some PSU's don't like it at all: because the "modified sine wave" is actually a non-symmetric square wave (or worse a "chopped" square wave) I made sure I bought a true sine wave UPS. Which failed far too quickly: the sine wave was fine, the batteries were fine, but when it switched over the 5V / 3.5V / whatever for the processor failed and it turned itself off ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
A cheap inverter produce a square wave instead of a sine wave.
There are two problems with that.
A. A square wave produces harmonics really high up in frequency which, if badly filtered, can produce a high amount of interference with sensitive electronics. This can have very strange consequences.
2. In most switched power supplies, the input is first rectified and filtered through a capacitor to create a direct current
To produce the same power through a resistive load, the peak voltage of a sine wave is sqrt(2) higher than the peak voltage of a square wave. this means the voltage of the rectified direct current is 0.707 lower than the voltage from a square wave.
So for a switched power supply to create the same output voltage from a square wave as from a sine wave it uses 1.414 times higher current.
This is one reason brownouts break a lot of electric equipment.
So, I would take a good look at the power supply for how LOW voltage it accepts, if that is less than 0.707 of the nominal voltage of the inverter you don't need to worry to much I think, since switched power supplies are not very sensitive to higher harmonics.
Then there are some intermediate priced inverters producing something called modified sine wave, which is looking similar to a truncated triangle wave.
Not with an el cheapo inverter, but today there are switched inverters producing something like an acceptable waveform for not that much more money.
Or you can buy a 12V power supply for the laptop. Like for example this: Amazon.com: CAR Charger[^]
I wanted to opions on slide to digital image conversion, I have the hardware and can convert them to jpgs, some of them are 'quite dark' to quote Mum, I was wondering if I captured them at a higher bit rate 96 instead of 24 and used a different save format I could them use some software (Paint.Net, Hypersnap or something else) to get more definition out of them? Just wondering... (also who thought Slides were a good idea?)
Last Visit: 5-Jun-20 18:50 Last Update: 5-Jun-20 18:50