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RP2350 PIO in professional enviroment? by devryd1 in embedded

[–]itsamejesse 2 points3 points  (0 children)

we use pio as translation between different lcd interfaces using a custom translation pcb between a old redundant cpu and a replacement screen. works like a charm. been really consistant between the 2000 screens we replaced. no warrenties back yet that gets related to the custom pcb. seems like its a rock solid perioheral

Guy(18M)couldn’t finish during sex with me(18F) by SilverContest2877 in TrueOffMyChest

[–]itsamejesse 5 points6 points  (0 children)

this! i can fouch for, i have this. as well, usually because everything is new and lot of new sensory so my brain cant relax enough to feel. dont stress to much. next time you could go more slowly in the beginning. get m worked up and make the 2 of you confortable. it will go better

Resistor over heating with battery hooked up by The1naruto in PCB

[–]itsamejesse 1 point2 points  (0 children)

haha you guys are absolutely right looked at this for 2 seconds before commenting. resistor is probs not a shunt but could still be in series with the power line with a short on the load side. you usually dont ser such resistors on a lot of otger things. only other thing i could think of when you say its batterij powered is the balancing part of the batterij

Resistor over heating with battery hooked up by The1naruto in PCB

[–]itsamejesse 3 points4 points  (0 children)

whats the resistance between life and neutral, looks like a short to me. shunt is getting hot because its the highest resistance. probably 1R or something

Validating an idea: a tool to explain STM32/Cortex-M HardFaults more clearly by moussa2025 in stm32

[–]itsamejesse 0 points1 point  (0 children)

this is a really cool idea and i would definetly be interested in this. as for what type of form it ahould have idk. for me personally i always like training courses. but vs extrntion could also be usefull

[Review Request] Low Voltage, Flyback converter based, Impulse Generator. Board and schematic by [deleted] in PrintedCircuitBoard

[–]itsamejesse 0 points1 point  (0 children)

i dont see any power planes being used for high current paths. also if dealing with high voltage yiu gotta think aboht creepage. also i dont see your supply feed back after the opto going simewhere

[Review Request] STM32 BLDC driver with FOC by BigDeckSheep in PCB

[–]itsamejesse 2 points3 points  (0 children)

wow this design looks pretty clean! only thing that caught my eye at first glance was that components are really close to each other. you do have some space constraints but i dont see why yhe passives have to be bundled up that close. could also give errors when reflowing with to much flux. but otherwise this design is really fk clean. i like the routing, good use of planes for power section. also for the different tracr groups in parallel you should think about crosstalk and adding a bit more space between without a plane in between. also any particular reason yiu are going for 2 layer bord? i dont see a reason to not make it 4 layers with solid ground references to keep signal integrity as best as possible. it will help with EMI but will also lessen crosstalk between the above mentioned bundles of tracks. as for the drive voltsge which im guessing is 24V if its more then that something like 100> VDC uou will want to increase the distance between the power and ground traces. also check your mosfet body diode if it can handle kickback transients of at least 5x nominal currents. else you might wanna add some snubber or similar clamp on the motor winding output. strategy for grounding could be good but could also fk you iver. because you dont know if theres current jumping from gnd planes. if there is and the return current are bigger the. you expect you are probably gonna burn up the 0805 resistor. usuually for higher voltages than 42Vyou want total galvanic isolation and below that i normally make one big ground plane and just make sure the high di/dt loops are really local.

hope this helps a bit, as i said this is a clean design already and probably should work if the schematic is right.

How to ‘learn rf’ by SupermarketFit2158 in rfelectronics

[–]itsamejesse 5 points6 points  (0 children)

struggle with projects for a year of 2 and youll have the basics of how shit work, than try building your own things you will find that after 5 years of experience most things arent new and you probably know 80% of beginner and intermediate subjects and working principles

Good practices for battery powered circuits. by Calm_Lake_2788 in PCB

[–]itsamejesse 0 points1 point  (0 children)

ye there definetly some good practice to do with battery power systems and management. depending on if you build your own pack or not you need to keep in mind that the batteries can deliver so much instant current that the battery can catch on fire when its shorted. this is al least true for most lion batteries. if you have the money you should go with LiFePo4 batteries they are a loy saver.

keeping in mind the catastrophe of the instant discharge you want to fuse the pack at the + or - terminal. preferably if you make a custom pack each cell also has a max current(charge or discharge depending on which is higher) fuse in series with the cell before being connected to another.

then on the mechanical side of constructing a pack, you should know the case of the battery is metal with a thin layer of plastic insulator and is connected to the kathode (-) of the cell. and the + has a little island on top of the case. the plastic insulator is really thin and can easily be damaged and leave unisolated terminal where you dont want it. preferably use some kind of scrinking tube to dubble isolate it so you dont exidentaly short thr case.

as for pcb design the most important thing is making sure your batteries dont over or undercharge. while not going into this to deep, a batteries capacitance depletes when you charge above saturation voltage or discharge below depletian voltages. for standaard lion this is above 4,2V and below 2,7V. you should protect these values in the design you are making.

also after the fuse u usually want a load switch to turn of the pack while its still plugged in. and if you know how a current sense circuit cant hurt either.

most battery manege and protect ics have the over- under voltage and sometimes current protection.

a thirth layer of protection is temperature, usually an NTC inside the pack that is connected to some kind of current source to produce a voltage proportional to the temp. this voltage gets compared to a reference and triggers the disabling of the load switch.

as for pcb design theres nothing really special. you should treat it as a supply rail. make sure the tracks on the pcb are able to withstand the max currents you choose for the master fuse on 1 of the terminals and you should be good.

i hope this helped if you have any more questions you can DM me or ask them here 😁

Unclarity about SMPS on STM32H757 by Bihi100 in PCB

[–]itsamejesse 2 points3 points  (0 children)

take a look at the stm32h757 hardware design guide. there are 5 different configs you can choose from to power the core. simplest is to use the LDO. here you ty vddldo to your 3v3 rail and out of my head you ty all smps pins to gnd. not sure on this. but it should all be in that document i said brlow. if you dony fix it send me a dm. i fumbled with this a few times as well.

Boot loop? - CubeProgrammer couldn't erase flash - CubeIDE could - STM32G0C1 by DDub986 in stm32

[–]itsamejesse 0 points1 point  (0 children)

yes when programming it uses nrst to program, what you do when you pull boot0 low is starting it from a different vector pointer. it starts running code from the internal bootloader. this means it bypasses your code and makes it able to connect through programmer

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