Open Source Hardware
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But I guess adapting your files is not trivial.If you have troubles with drilling only, most probably it is due to wrong units or formatting. Usually it is stated in the service's FAQ what units and formatting it's expecting. Also, X2 is not very popular, better to avoid it.
You mean earth from a main. Afedorov has a own schematic, inspired from eevblog, published somewhere hereIt's not perfect, still I'm using it with no problems so far. I don't know why, but my transformer, having separate shield winding directly connected to earth, still gives decent coupling to the secondary, so I'm having around 13VAC between tip and earth with 1M protection resistor. Though, I'm sure it's better than having direct earth connection which was played with me hard couple of times.
Not quite exactly, 10k - protection up to 100VYep, I've calculated it for the usual 90V Cy bias on 230V mains. With 10M pull-up 1M is the maximum value.
Can I do that for sense B, without modifying the firmware? Or do I have to modify the firmware for that?FW modification is required. Theoretically, only SChannel parameter of NO INSTRUMENT profile have to be changed to 2, but I didn't tried it. Both current source channels are set to 128, so calibration resistor can go to either. If you have some problems with ch. B ADC value would be close to its limits.
But, I also haven't found the reason sparkybg gave why it should not be connected the other way round, like for the C210. Can anyone point me to a answer there?It's because C210 TC is connected differently within cartridge.
How the beginner will realize existing of that stuff , to be able to take adequate actionWell, such a beginner shouldn't even think of assembling this project in the first place. It's pretty advanced stuff. Anyway, if the project will adopt this feature, this should be mentioned in the readme/documentation.
What about to change D1-D4 with a double current specs and change a bridge rectifier with a Single diodeNo difference with just switching upper FETs for every second half-period, but with more hassle.
Actually it has 440uf, but will it be enough?... may be yesNo, it senses rectified AC, there is nothing to do with any MCU supply filtering. There is some firmware filtering, but I didn't analyze what exactly FW is doing in this regard. And it actually don't have to be that strict. If adding such a feature, power lost detection could be just blocked for a couple of mains periods, forty odd ms should be plenty to switch a relay, and not even close to VDD dropping below brown-out threshold. It's somewhat half a second power lost message is held on the display prior it shuts down.
but also by increasing the work frequency by 2Good only for DC supply. On AC it would possibly be asymmetric to the transformer and it will be DC biased. Magnetics doesn't like that stuff. Again, Sparky already explained this.
Which voltages would I expect to change when I adjust current?All the voltages along temperature measurement path. Linear dependency on current: two times less the current - two times lower the voltage. Your voltages seems perfectly fine. Only R55 separate U17:6 with ADC input, but it's unlikely the cause of the problem.
I did this with a 1k resistor and then with 10ohm resistor at Vout1- to SenseA:It's a little bit off, but I'm sure it's due measurement/identification. At least it's not 6 times lower. It seems diff amp is working OK.