My Advanced Realistic Humanoid Robots Project

[Manul]

@artbyrobot, build something. Cause all these talks are getting boring and are useless. Seriously. If I remember correctly, you said power supply is 90% done. Today you said, you will not build it. Ok, don't build it, maybe it will even save your life, who knows. But do something.

[EEVblog]

I can quite happily try to ignore this thread. The thing that's p*ssing me off is that it's it keeps wiping out so much of the 'Recent Posts' section!

There is an Ignore Topics feature.

[vk6zgo]

Cool, but it won't let me enter a topic to ignore.
Perhaps it is just a Firefox artifact, so I will try later with Microsoft Edge.

[Alex Eisenhut]

Cool, but it won't let me enter a topic to ignore.
Perhaps it is just a Firefox artifact, so I will try later with Microsoft Edge.

It's not just you. That "ignore topics" thing is utterly baffling. What are you supposed to click on or do? It's great that there's text on my screen that reads "ignore topics", but "ignore" is a verb, so where can I accomplish this action? There's nothing obvious to click on, like there is for "Un-Ignore all my ignored topics".

Some ten year old search results seem to indicate that you can ignore topics from your "Recent Unread Topics" in your profile, but I don't see the "ignore topic" icon.

I also use FF, but Chrome is the same.

[Kim Christensen]

The topic you want to ignore has to have new unread comments in it. Otherwise you can't ignore it.
ie: you can only put it onto your ignore list via the "Show new replies to your posts" list. So click "Mark unread" after reading this message. Then go to the "Show new replies to your posts" list.

[artbyrobot]

Coincidence? No. Anyway, I don't believe you, so who cares.

I just posted a new link to a schematic with .psd file extension for you all to download and inspect the saved date.  I found it on a monthly backup of my main hard drive so that its last save date was before we began discussing any of this in this thread.  You can see on it that as of february I had moved the fuse location which you falsely stated I did not do until just recently when told to do so on this forum, calling me a liar.  So that's a false accusation plainly as now proven.  So your need to believe me is irrelevant.  I posted stone solid factual evidence that is not refutable.  If you are too lazy to verify, that's on you.  The evidence was posted and you still are ignorantly going on with your false accusation anyways.

The psd posting in question:

"New" schematic file edited with Photoshop CS2, timestamp 2024 11 10, 22:37:32. You made that "improvement" yesterday after hearing what people said, don't you? You posted it just after someone explained about the voltage levels. And you moved the fuse, which was also suggested here yesterday. Now you present it like it was done by you, some "iteration" of your power supply design. I applaud you.

Here is proof the fuse moving was done by me in febuary on my schematic.  http://artbyrobot.com/switch%20mode%20power%20supply.psd

So enough with your foolish false accusations manul

Also the voltage to drive it was discussed in this february one although I didn't raise it enough and now it turns out even the 165v andy suggested is too low even.  It needs like 180v according to chatgpt just now.  Since the rectified voltage is 168v-170v peak dpeending on 115v-120v input before the diode brdige rectifier.  In my last update I did in February, I knew the voltage had to be higher than 10v more like 55v but didn't realize it had to be 10v higher than the supply voltage at the time I thought it had to be 10v higher than the drain voltage which I now understand is inaccurate but I was getting there already before anyone here said anything.

[EEVblog]

It's not just you. That "ignore topics" thing is utterly baffling. What are you supposed to click on or do? It's great that there's text on my screen that reads "ignore topics", but "ignore" is a verb, so where can I accomplish this action? There's nothing obvious to click on, like there is for "Un-Ignore all my ignored topics".
Some ten year old search results seem to indicate that you can ignore topics from your "Recent Unread Topics" in your profile, but I don't see the "ignore topic" icon.
I also use FF, but Chrome is the same.

I'm using Chrome.
You have to go to the "Show new replies" or "Show Unread Posts" page and you will see the Ignore Topic button top right. Check the box for the topic you want to ignore and hit the button and it adds it to your list.

[Kean]

Also the voltage to drive it was discussed in this february one although I didn't raise it enough and now it turns out even the 165v andy suggested is too low even.  It needs like 180v according to chatgpt just now.  Since the rectified voltage is 168v-170v peak dpeending on 115v-120v input before the diode brdige rectifier.  In my last update I did in February, I knew the voltage had to be higher than 10v more like 55v but didn't realize it had to be 10v higher than the supply voltage at the time I thought it had to be 10v higher than the drain voltage which I now understand is inaccurate but I was getting there already before anyone here said anything.

I don't think you should attempt building your power supply, as I do not believe you are competent enough in electronics to work on anything over 30V or 3A.

That said, if you want to learn something you might want to do a web search on the words "MOSFET floating bootstrap".

I am kind of curious to see where that might lead you, and to see your next revision of the power supply "schematic".  I'm sure it will be done in an "expert fashion elite level".

[artbyrobot]

do a web search on the words "MOSFET floating bootstrap".

I can't really read schematics unless they look like the one I made or similar.  I don't know all the symbols by heart so it gets confusing.  The way I made mine is like flash cards to help you learn the symbols and what the part looks like. 

Anyways, I had chat gpt explain this floating bootstrap thing to me and I didn't get it.  I asked chatgpt if I can just use a boost converter to make the 180v and it said yes.  So that's the best way since that I get.  I'd use a swtich to turn on the switch, a little buddy logic level mosfet will switch the 180v output cable on so that the 180v reaches the gate of the highside switch taht needs 180v to turn on (162v rectified voltage + 18v = 180v).  The 180v accounts for peak voltages of the rectified voltage ranging from 162v to 170v.  I assume finding such a boost convert should be easy and it should be a tiny board like the size of my thumb.  Hope I'm right.  If not, I think I'll make or buy a little transformer that goes from 115vac to 180v ac (boost transformer?)  and then use that as my power supply for my highside switch.  That can be very small since not many amps are needed to power a switch on and off.

[ebastler]

I can quite happily try to ignore this thread. The thing that's p*ssing me off is that it's it keeps wiping out so much of the 'Recent Posts' section!

There is an Ignore Topics feature.

But, in contrast to what's stated in the screenshot you shared, ignoring a topic will only remove it from the "Unread posts since your last visit" and "New replies to your posts" lists. Posts will still show up in the "Recent posts" list (bottom of the forum's main page). Personally I don't mind that since I don't use that list, but I think it is what Gyro was referring to.

[Analog Kid]

Omigod omigod: a robot designed by ChatGPT!

What could go wrong?

Yikes.

[Kean]

FYI "floating bootstrap" isn't a thing - those are just keywords.

I was hoping you might actually put some effort in and learn something - but nope, back to ChatGPT for more hallucinations (if not AI then you).

At least you admit to being confused.  A far cry from the electronics expert you bragged about being.

Anyway, I see a lot of blown MOSFETs in your future - either from working on that power supply, or those physically abused ones on your motor drivers.  MOSFETs are not the magical switching devices you seem to imagine.  They are actually quite sensitive devices and need to be operated in their SOA (safe operating area).  And gate capacitance can be real fun...

Good thing you live in the USA where mains is only 115V-ish.  In much of the world (where we have 230V-ish) things are substantially more dangerous.

[abeyer]

You have to go to the "Show new replies" or "Show Unread Posts" page and you will see the Ignore Topic button top right. Check the box for the topic you want to ignore and hit the button and it adds it to your list.

Except people mostly won't even see those, because I think the option to show them still defaults off and is well hidden.

You have to go to Profile > Account Settings > Modify Profile > Look and Layout, and then set the option Show quick-moderation as
checkboxes before you'll have the ability to do that.

perfectly obvious, right? 

[EEVblog]

You have to go to the "Show new replies" or "Show Unread Posts" page and you will see the Ignore Topic button top right. Check the box for the topic you want to ignore and hit the button and it adds it to your list.

Except people mostly won't even see those, because I think the option to show them still defaults off and is well hidden.
You have to go to Profile > Account Settings > Modify Profile > Look and Layout, and then set the option Show quick-moderation as
checkboxes before you'll have the ability to do that.
perfectly obvious, right? 

First I've heard of that.

[EEVblog]

But, in contrast to what's stated in the screenshot you shared, ignoring a topic will only remove it from the "Unread posts since your last visit" and "New replies to your posts" lists. Posts will still show up in the "Recent posts" list (bottom of the forum's main page). Personally I don't mind that since I don't use that list, but I think it is what Gyro was referring to.

And what do you want me to do? Lock every thread someone doesn't like because it's "too popular" and people can't help themslves contributing to because it keeps appearing on your list? 
If there is a "Permanantly Hide Topic" plugin for the forum then point me to it and I can install it.

[EEVblog]

But, in contrast to what's stated in the screenshot you shared, ignoring a topic will only remove it from the "Unread posts since your last visit" and "New replies to your posts" lists. Posts will still show up in the "Recent posts" list (bottom of the forum's main page). Personally I don't mind that since I don't use that list, but I think it is what Gyro was referring to.

And what do you want me to do? Lock every thread someone doesn't like because it's "too popular" and people can't help themslves contributing to because it keeps appearing on your list? 
If there is a "Permanantly Hide Topic" plugin for the forum then point me to it and I can install it.

And what do you know, there is such a mod and I just installed. You should now see a Hide Topic button top right in this thread. It should hide it from you forever.

[ebastler]

But, in contrast to what's stated in the screenshot you shared, ignoring a topic will only remove it from the "Unread posts since your last visit" and "New replies to your posts" lists. Posts will still show up in the "Recent posts" list (bottom of the forum's main page). Personally I don't mind that since I don't use that list, but I think it is what Gyro was referring to.

And what do you want me to do? Lock every thread someone doesn't like because it's "too popular" and people can't help themslves contributing to because it keeps appearing on your list? 
If there is a "Permanantly Hide Topic" plugin for the forum then point me to it and I can install it.

As mentioned, I am not bothered by the ignored topics showing up in the Recent Posts list. Just wanted to point out that your earlier reply to Gyro did not address his issue.

My recommendation to registered and logged-in users would be to ignore the Recent Posts list entirely and refer to the "Unread topics since your last visit" instead. I find that one more useful snice it excludes the posts I have already looked at, or chosen to not look at the last time I checked in. To my mind, the generic Recent Posts list is mainly useful for unregistered users who cannot get a more tailored list of posts.

[EEVblog]

And what do you know, there is such a mod and I just installed. You should now see a Hide Topic button top right in this thread. It should hide it from you forever.

Scratch that, doesn't seem to work. Button is there but gives 500 ERROR. Uninstalled. Sorry, I tried.

[Simon]

I was planning to use a n channel mosfet.  I don't like p channel mosfets.

I don't like them because I don't understand the notion of providing a mosfet with negative voltage and how that is done and so I view this as a pandoras box for a electronics beginner.  I like to use components that make sense to me intuitively.

I see, well no one likes P channel MOSFETS, I just never dreamt that you would be attempting an N channel on the high side. But the same applies. You can't just generate 165V to turn on a MOSFET because you can't assume it is sitting at 155V. again your results will range from working to a blown MOSFET. You need a 10V supply (hint 12V is also fine most of the time), that sits on the positive rail so that it goes up and down with it and your MOSFET.

As for dealing with negative voltages, get used to it. It's simply algebra, all you do is take into account the sign of the number, everything is referenced to ground or any arbitrary point you call 0V, We just happen to pick certain same things to call 0V, it's just signed math.

[artbyrobot]

you can't assume it is sitting at 155V

Well if the AC after it goes through the diode bridge rectifier is 162v-170v like chatgpt said, then 180v to drive the gate will put me at 180-162= 18v or 180-170=10v so within safe range always unless you are suggesting sometimes it will be below 162v.  In this case, wouldn't the last known highest voltage input still be stored in the capacitors placed right after the diode bridge rectifier so that I can expect 162-170v guaranteed?  If not, even if it is possible to drop below this like 150v and my 180v would put me at 30v so too high, I guess I could put a voltage divider in and have the arduino read from this and not turn on my mosfet unless it is within 162-170v.  This would handle the presumably rare edge case you are alluding to.

But yeah I just want to use a small dedicated 180v power supply that is fixed voltage because floating voltage variable supplies that track the positive rail that you were talking about I don't understand so don't want to try that.  Would be above my paygrade so to speak.

[Gyro]

But, in contrast to what's stated in the screenshot you shared, ignoring a topic will only remove it from the "Unread posts since your last visit" and "New replies to your posts" lists. Posts will still show up in the "Recent posts" list (bottom of the forum's main page). Personally I don't mind that since I don't use that list, but I think it is what Gyro was referring to.

And what do you want me to do? Lock every thread someone doesn't like because it's "too popular" and people can't help themslves contributing to because it keeps appearing on your list? 
If there is a "Permanantly Hide Topic" plugin for the forum then point me to it and I can install it.

As mentioned, I am not bothered by the ignored topics showing up in the Recent Posts list. Just wanted to point out that your earlier reply to Gyro did not address his issue.

My recommendation to registered and logged-in users would be to ignore the Recent Posts list entirely and refer to the "Unread topics since your last visit" instead. I find that one more useful snice it excludes the posts I have already looked at, or chosen to not look at the last time I checked in. To my mind, the generic Recent Posts list is mainly useful for unregistered users who cannot get a more tailored list of posts.

My problem is that the bold text Recent Posts section is the only one I can read without reaching for my glasses in the early morning (and without logging in on my phone)!  I do realize that this is my problem but it is irritating.

[jpanhalt]

I see, well no one likes P channel MOSFETS, I just never dreamt that you would be attempting an N channel on the high side.

As for dealing with negative voltages, get used to it. It's simply algebra, all you do is take into account the sign of the number, everything is referenced to ground or any arbitrary point you call 0V, We just happen to pick certain same things to call 0V, it's just signed math.

I like P-mosfets (and PNP BJTs).  They can source rather than sink current.  The negative needed for a P-mosfet is referenced to its Source, which typically is not ground.  Thus, just grounding the gate turns it on.  I am sure you understand that but AR  may not.

[artbyrobot]

I wanted to have my n channel mosfets for my motor controllers have a little baby mosfet mounted on top of it and a little resistor and led on top of it too so I can see when it switches on visually for testing/debugging.  I also wanted a diode mounted to the side of it.  I was doing all this will little strips of nickel strip to connect it all deadbug style, but I thought pyralux printed circuit board (the flat flexible version of a printed circuit board) would be a easier way to do these.  I wanted to do the same for the little components I want to mount to the top of the microcontroller.  The microcontroller and the mosfets for powering the motor together form the motor controller and they are just free floating as opposed to all being on one flat plane circuit board.  So I wanted just little pieces of pyralux circuit board that connect all these little components together haphazardly.  I wanted these little pieces laser cut and assembled (PCBA).  They wanted to bill me for 5 designs but I told them it was really all 1 design just little pieces that overlay eachother and stuff.  It wasn't part of many different projects like they were treating it.  And they bumped the price way way way up based on 5 designs.  Is there any way to work around this?  or way to explain this better or a company that would do this without saying its 5 designs?  Not sure what to do.  Like one of the "designs" is a strip of copper trace, a pad for mounting a resistor, then more trace, then a pad for mounting a led, then more trace.  That is 1 design apparently.  But that goes onto the top of the mosfet so its not a separate design.  It's more like a separate layer of the other design.  It's just not fair.

[joeqsmith]

The topic you want to ignore has to have new unread comments in it. Otherwise you can't ignore it.
ie: you can only put it onto your ignore list via the "Show new replies to your posts" list. So click "Mark unread" after reading this message. Then go to the "Show new replies to your posts" list.

You have to go to the "Show new replies" or "Show Unread Posts" page and you will see the Ignore Topic button top right. Check the box for the topic you want to ignore and hit the button and it adds it to your list.

Except people mostly won't even see those, because I think the option to show them still defaults off and is well hidden.

You have to go to Profile > Account Settings > Modify Profile > Look and Layout, and then set the option Show quick-moderation as
checkboxes before you'll have the ability to do that.

perfectly obvious, right? 

Thank you very much abeyer  for that insightful tip.  Changing that setting caused the buttons Dave shows to be displayed in both browsers.    Now I guess I have to wait for someone to post again....

[ebastler]

So I wanted just little pieces of pyralux circuit board that connect all these little components together haphazardly.  I wanted these little pieces laser cut and assembled (PCBA).  They wanted to bill me for 5 designs but I told them it was really all 1 design just little pieces that overlay eachother and stuff.  It wasn't part of many different projects like they were treating it.  And they bumped the price way way way up based on 5 designs.
  Is there any way to work around this?  or way to explain this better or a company that would do this without saying its 5 designs?

You didn't tell us who "they" were, i.e. which company you talked to and what their quoted price was. Low-cost PCB houses like JLCPCB offer very competitive prices, also on flexible PCBs. While they also adhere to the definition "If it's multiple unconnected sections, then it's multiple designs", you may find their pricing much more affordable.

One of the reasons JLCPCB is cheap is because their process is highly automated. So you will be in charge of the CAD design, using a proper PCB layout tool -- no "painting" in some general-purpose drawing program. They have their own "EasyEDA" PCB CAD program which is available for free in ain online version.

As a general comment, I am not sure you really want to use flexible PCBs unless you really need the ability to bend them (e.g. to use some longer traces as interconnect to other modules). They are much more sensitive than rigid PCBs, and flexing them where components are mounted will also put stress on the solder joints. You can get thinner FR4 material than the standard 1.6 mm; JLCPCB lets you go down to 0.6 mm at a small extra cost.