Hey! Really not my cup of tea, but here's a few comments:
what are the input outputs? Are you powering 6 lasers at the same time? Why hook it up to an arduino? How are the lasers connected? What is a good representative load for your laser (probably resistive, but maybe inductive or capacitive?)
Looking at the driving circuit, there's something fishy about them. Having a variable Vi and static ADJ pin is not what I would have expected, nor what the datasheet suggests
how about providing a fixed, appropriate voltage on the + terminal of your laser and have low side switching through a mosfet?
components seem pretty basic, you could probably simulate this throught spice to get a better idea of what's happening (you can prob do this directly in kicad). Be careful about choosing models for stuff outside the PCB like the lasers. Long cables can have significant capacitive load for example.
EDIT: I think the gist of the problem is that (1) the LM317 is powered on and off continusly, causing transients, power on delays,... (2) the adjust pin depends on the voltage on the output pin, potentially causing more resonance/weird transients. I would: stick to the suggested circuit in the datasheet of the lm317, and move the switching transistor between the lm317 and the laser.
I would tend yo disagree a bit with the other comments.
First of all, let's talk about the scratch. It does not looks very deep, so most likely no damage to traces. In order to have a short you would also need to have two traces exposed and some metallic object between the two. This also look unlikely to me. I would clean the area with isopropyl alcohol, check it visually. You could also cover up the scratch with nail polish.
Then, the missing capacitor. First of, I cannot make from the picture if there was a capacitor soldered there in the first place. Sometimes there are purposfuly unpopulated components.
In any case, all of the capacitors you are seeing on the backside of the CPU are decoupling capacitor. They serve no other purpose than to help stabilize the voltage versus the dynamic power draw. This means that less capacitors equals less stabilisation, but not necessarily incapacity to function.
I would clean also clean it up and ensure that no metallic object touches the pads. I would probably not try to replace it, as you have no way of knowing what value the capacitor is supposed to be (usually no schematic/boardview for modern products).
It is theoretically possible to damage the CPU due to a short, but likelihood seems very low to me in this case. I would clean it up, check visually, and try to turn it on.
ようこそ! It's nice to have people from all around the world around here. I'm from Switzerland, and have had strong links with Japan as my father was an importer for Japanese paragleiders (the best ones around the nineties), and I've been learning it a tiny bit the last two years.むずかしです！
As for AI, I think you'll find out that the opinions on lemmy can differ quite a lot. The genie's out of the bottle, but it's not yet settled what it will do, and if the outcome is going to be positive for humanity. As an engineer working partly in IT, I must agree that it's an important tool to get to know though.
May I ask from what region you are from? Japan's a big country!
Oh god, I never considered that .* could theoretically match ... Thanks fish for not doing that, more than likely saved my unknowing ass a couple of times
It's not a matter of "him" personally. Permissive license allow for a work to be taken and redistributed by other entities, without enforcing them to release their changes. This creates a one way relationship that is generally detrimental to the open source ecosystem, allowing work to be stolen away from the public.
That being said, choosing a license is situational, and a permissive one can be a great choice in certain instances. For that particular case, I don't see much benefit to having a permissive licence.
I believe it does. Weakly reciprocal license like LGPL is not equivalent as a permissive license like Apache.
I see two main things on the top of my head:
This ensure that no one can license wash ffmpg and e.g. use rockchip's repo to distribute their own private product based on ffmpeg without publishing their changes
It ensures proper attribution of the work, which can have an impact on the developer's careers and ffmpeg as a whole.
On top of this, it really should not be complicated to license this code properly (unless rockchip wants to allow point 1, which is illegal)
Thank you for the pics and explanations! Seeing such big power transformer in a wooden box terrifies me, probably more than it should.
For the ADC, I'm not too sure what you could use. The easy way would be to use ZMPT101B, and live with the fact that you would be using 1% of its range (you would need to check its resolution).
Maybe you could also try to rectify it using an ideal diode IC.
The fact that a capacitor is marked with a 1000V label does not necessarily mean that 1000V are present on its terminal (but you should use caution). I don't think the voltage makes it out of the realm of electronics.
It's quite hard to answer your question, as the board is quite dirty and you provided a single picture.
You could check for continuity and capacitance value with a multimeter
Turns out that this is common in Japan for tea fields. They mount big fans on poles all accross the field for it (you provably have to zoom in to see them)
I feel very out of the loop here. Can someone please explain what is going on?
There's always been some mockery online about some of Gnome's stance (minimalism, app indicator) which is annoying, but does not seem too bad.
But full blown targetted harassment? Why on earth would someone target them specifically?
I do not know if they are open to the public per se, but it seemed to be something they do quite regularly.
Concerning the material, they say on their site that it is a "polymer". On this page they go quickly over how the measurements work.
I was actually not visiting sensirion, but lumiphase. A smaller company they are investing in which does optical chips. It's interesting stuff, they are also depositing unusual materials on the silicon wafer to make their chips work.
Thanks!
I recently was in the headquarters/production facilities of Sensiron which interestingly are located near Zurich in Switzerland. It's quite rare to see production of IC's in this country.
The "magic sauce" of the sht40 and friends is the deposition of a certain matieral (can't remember which one) on top of the classic silicon die.
Hey! Props to you for trying something new.
While the through hole components look OK, soldering large gauge wire can be quite tricky, especially if the soldering iron is not powerful. What soldering iron do you use?
In these cases especially, it is important to wick the wire first, wick the soldering pad and finally assemble the two. Raising the iron temperature for this can also be useful (I sometimes use 400° or a bit higher). It is counter intuitive, but hotter iron means quicker soldering job, and less heat in the surrounding area (e.g cable's insulator)
I have one of these right in front of me (SPEC-3). They sure look very nice, but mine would need some work to properly work again :( Time's not kind on electronics
Hey! Really not my cup of tea, but here's a few comments:
EDIT: I think the gist of the problem is that (1) the LM317 is powered on and off continusly, causing transients, power on delays,... (2) the adjust pin depends on the voltage on the output pin, potentially causing more resonance/weird transients. I would: stick to the suggested circuit in the datasheet of the lm317, and move the switching transistor between the lm317 and the laser.
I would tend yo disagree a bit with the other comments. First of all, let's talk about the scratch. It does not looks very deep, so most likely no damage to traces. In order to have a short you would also need to have two traces exposed and some metallic object between the two. This also look unlikely to me. I would clean the area with isopropyl alcohol, check it visually. You could also cover up the scratch with nail polish.
Then, the missing capacitor. First of, I cannot make from the picture if there was a capacitor soldered there in the first place. Sometimes there are purposfuly unpopulated components. In any case, all of the capacitors you are seeing on the backside of the CPU are decoupling capacitor. They serve no other purpose than to help stabilize the voltage versus the dynamic power draw. This means that less capacitors equals less stabilisation, but not necessarily incapacity to function. I would clean also clean it up and ensure that no metallic object touches the pads. I would probably not try to replace it, as you have no way of knowing what value the capacitor is supposed to be (usually no schematic/boardview for modern products).
It is theoretically possible to damage the CPU due to a short, but likelihood seems very low to me in this case. I would clean it up, check visually, and try to turn it on.
ようこそ! It's nice to have people from all around the world around here. I'm from Switzerland, and have had strong links with Japan as my father was an importer for Japanese paragleiders (the best ones around the nineties), and I've been learning it a tiny bit the last two years.むずかしです！
As for AI, I think you'll find out that the opinions on lemmy can differ quite a lot. The genie's out of the bottle, but it's not yet settled what it will do, and if the outcome is going to be positive for humanity. As an engineer working partly in IT, I must agree that it's an important tool to get to know though.
May I ask from what region you are from? Japan's a big country!
Pocketbook makes nice e readers too! Issue then is mostly with getting books, especially non-drm ones
Oh god, I never considered that
.*could theoretically match... Thanks fish for not doing that, more than likely saved my unknowing ass a couple of timesIt's not a matter of "him" personally. Permissive license allow for a work to be taken and redistributed by other entities, without enforcing them to release their changes. This creates a one way relationship that is generally detrimental to the open source ecosystem, allowing work to be stolen away from the public. That being said, choosing a license is situational, and a permissive one can be a great choice in certain instances. For that particular case, I don't see much benefit to having a permissive licence.
I believe it does. Weakly reciprocal license like LGPL is not equivalent as a permissive license like Apache. I see two main things on the top of my head:
On top of this, it really should not be complicated to license this code properly (unless rockchip wants to allow point 1, which is illegal)
Thank you for the pics and explanations! Seeing such big power transformer in a wooden box terrifies me, probably more than it should.
For the ADC, I'm not too sure what you could use. The easy way would be to use ZMPT101B, and live with the fact that you would be using 1% of its range (you would need to check its resolution). Maybe you could also try to rectify it using an ideal diode IC.
The fact that a capacitor is marked with a 1000V label does not necessarily mean that 1000V are present on its terminal (but you should use caution). I don't think the voltage makes it out of the realm of electronics.
It's quite hard to answer your question, as the board is quite dirty and you provided a single picture. You could check for continuity and capacitance value with a multimeter
Turns out that this is common in Japan for tea fields. They mount big fans on poles all accross the field for it (you provably have to zoom in to see them)
I feel very out of the loop here. Can someone please explain what is going on? There's always been some mockery online about some of Gnome's stance (minimalism, app indicator) which is annoying, but does not seem too bad. But full blown targetted harassment? Why on earth would someone target them specifically?
I do not know if they are open to the public per se, but it seemed to be something they do quite regularly. Concerning the material, they say on their site that it is a "polymer". On this page they go quickly over how the measurements work.
I was actually not visiting sensirion, but lumiphase. A smaller company they are investing in which does optical chips. It's interesting stuff, they are also depositing unusual materials on the silicon wafer to make their chips work.
Thanks! I recently was in the headquarters/production facilities of Sensiron which interestingly are located near Zurich in Switzerland. It's quite rare to see production of IC's in this country. The "magic sauce" of the sht40 and friends is the deposition of a certain matieral (can't remember which one) on top of the classic silicon die.
Hey! Props to you for trying something new. While the through hole components look OK, soldering large gauge wire can be quite tricky, especially if the soldering iron is not powerful. What soldering iron do you use? In these cases especially, it is important to wick the wire first, wick the soldering pad and finally assemble the two. Raising the iron temperature for this can also be useful (I sometimes use 400° or a bit higher). It is counter intuitive, but hotter iron means quicker soldering job, and less heat in the surrounding area (e.g cable's insulator)
The green and orange colors are quite typical of the phoenix contacts brand. It's not a perfect match, but this model is very close: https://www.phoenixcontact.com/en-us/products/printed-circuit-board-terminal-sptaf-1-7-35-il-1861988
For edits whithin a page, I use inkscape. Both program combined have covered all my needs until now.
I have one of these right in front of me (SPEC-3). They sure look very nice, but mine would need some work to properly work again :( Time's not kind on electronics
Looks great!
If your are looking for pur aesthetics, I would recommend trimming the resistors/leds, and bending their leads before putting them on.
If you'd like some inspiration this guy has some of the best looking hand crafted electronics I've ever seen.
I don't know so much about EGS, but probably some of the following (most of which I don't use very often, I hope I recall correctly)
Freecad is getting more and more attention. When version 1.0 releases (soon), it will be something worth checking out, but there is still work to do.