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How to mount a rotating tray above a servo?

668 1 Mar 18.2020, 18:05:34
I'm working on a project where I want to have a servo rotate a tray. Originally I was going to use a larger servo so I was just going to mount the tray directly to the servo and let the servo bear the weight. But in my new attempt at the project I'm going to use a smaller servo (MG90S Servo 9G Micro Servo) and I don't think it will hold the weight that I want. It's not that its supporting much weight but the servo is going to be at the corner of a pie-ish shaped tray and all of the weight will be at the bell end. So even with just some random light junk in a 3d printed tray it will still have a fair amount of torque on the mounting point. What's the best way to mount the tray so that the servo can still rotate it? Ideally I'd like to directly couple the tray to the servo for rotational purposes (i.e. no gears or belts, but on extension axle from the servo head to the tray is fine). I guess what I need is some kind of bearing that has a bracket on it that I could screw the tray onto but...

Is there a question without certification as bringing a product to market?

621 1 Mar 16.2020, 18:09:49
Hello! I'm ready to bring my project to market and am trying to navigate the certification process. I am aware of the standard approach to certification - I just don't have money and time. My product is essentially just a low voltage power controller running custom software (raspberry pi controlling mosfets to 12V solenoids), and has already been tested on-site by my business partner / pseudo-first-customer. The only custom electronics I built were the power controller boards, using I2C GPIO expanders and mosfets, and a sensor board with more GPIO expanders and some pull-down resistors to measure simple open-close switch sensors. In order to avoid having to certify this product I thought I could just swap out my custom boards for some off-the-shelf boards from a reputable source, but in looking around I noticed that those boards don't seem to have any certifications either... So now I'm wondering whether it is at all possible to avoid borrowing a few grand and getting the paperwork, an...

How about my board design?

713 1 Mar 13.2020, 23:16:24
hey I’m making my first board using the raspberry pi compute module 3+ and was wandering is someone can review my work and tell me if its correct and will work plus give me some advice to improve it. the board is powered from a 12v battery and is used for vision detection using the camera port.thanks in advance.

Anyone knows mixed PTH and SMD PCB?

678 1 Mar 11.2020, 00:19:01
We are doing a PCB which has both surface mount components and through hole components on it. The surface mount components are on both sides of the PCB. What’s the closest that a surface mount pad can be to a through hole pad?

Any ideas about via in pad of PCB design?

556 2 Feb 27.2020, 18:50:57
Is it recommended to put the vias in the middle of the pad? I am making a 4 layer PCB. I want to connect the SMD(package 1210) components from 1st layer(signal layer) to 2nd layer (ground). So Can I place the via in the mid of the component pad or should I place it near to the component and connect it through track? Thanking in advance.

How about making PCBs with Press n Peel film

613 1 Feb 27.2020, 00:06:45
I have successively used Press n peel to make at least 2 double-sided PCBs several years ago. But over the last few days, I have been trying to do another PCB, but no success & don't know why it is not working.I followed the Press n Peel instructions. i.e. I rubbed the bare copper with steel wool, then washed it with soap & water, then washed the soap off and dried it with a lint free cloth. But after much ironing, only a few slight traces of tracks were visible. I also used a procedure I found on an electronics forum which is essentially the same but it uses isopropyl alcohol rather than soap & water. The result was slightly better, but certainly not adequate. I really don't know why it worked previously but not this time. I used the same HP Laser printer. I also heard that the PCBs can be made by simply printing the image of paper rather than the P n P film. But apparently it takes a lot of work to remove the paper. However, if it works, I will do it that way.Any assistance will be...

Small BGA pad size-likelihood of success?

517 1 Feb 24.2020, 22:26:20
Hi guys, I'm trying to fan out a 36 pin BGA for prototyping. I tried to fan out a 36 pin 0.4mm pitch BGA on the top layer with a random 36 ball BGA I had in my library assuming a 3/3 mil process and it wouldn't work - the pad size was 200 micron as recommended on its datasheet. Makes sense since at 200 micron, assuming an X/X mil process capability yields X = 66.7 micron => 2.7 mil < 3 mil. I looked up the datasheet for the IGLOO Nano UC36 package; they recommend NSMD, pad diameter of 230 micron with a 330 micron mask, suggesting that the pads are 34% smaller than recommended! I'm just wondering based on others' experience, how this is likely to go assuming I use 6 mil pads with a 10 mil mask? I'm just prototyping, so trying to keep the NRE cost down.Thanks in advance for any guidance. Cheers,

Vicor DCDC modules on test PCB...need to mount heatsinks on them

491 1 Feb 23.2020, 00:15:57
Hi, We are doing a Test PCB containing one Vicor BCM4414xH0E5035yzz module, which will feed 4 paralleled Vicor DCM3623x50M53C2yzz modules. (these are all DCDC modules) The BCM module will dissipate 84W. Each DCM module will dissipate 43W. We are going to need heatsinks on them. We think the best way would be to put 3mm NPT holes near the 4 corners of each module….and then use these to fit an aluminium heatsink plate over each module’s surface….ie screws and nuts/washers, to pressurize an aluminium plate against each module surface. Would you say this is the cheapest way to do it for this test (only) PCB? Also, the BCM module that we are using is the “board mount” version. (pg 39 and 40 of the datasheet). It appears that holes 10,11,12 & 13 are for screwing the module to the PCB…..then PTH pads 1,2,3 & 4 are for power input and output. But what are the screws for on pads 1,2,3 & 4?.......since the “board mount” version "solders" into the PCB…so why does it have these 4 screws at pad pos...

Need help designing a counter circuit

624 1 Feb 21.2020, 20:35:03
I am currently designing a counter circuit, however, i keep running into issues and a point in the right direction would be greatly appreciated.Components I want to include: - a 7-segment display and 4026 - a PICAXE and/or a 555 IC (the PICAXE would be used to turn the device off without resetting the 7-segment display) - an LED to show that the device is on - three switches: one to reset, one to turn off/on the device and one to add to the count - possibly a piezo buzzer to read the count on the 7-segment display (?)I have attempted to make this circuit (it is attached) but did not get very far. Again, any advice would help, thanks.

How about pick and place files?

617 1 Feb 19.2020, 18:01:48
Hi Guys, I wanted to generate a pick & place files for a PCB panel that consists of 4 columns and 2 rows of a board. Should the pick and place file include all components information across the whole panel or just one of the anchor board?