hybridfree/eevblog-posts huggingface dataset:
RJ45 SMD >=CAT6? - Page 1
Forum section: electronics / projects

author: 1uk3
author_rank: Contributor
timestamp: October 16, 2018, 06:51:31 am
content: HiI was just looking for a surface mount RJ45 8p8c 90° connector with at least CAT6 rating but can not find any(DigiKey, RS, Mouser, Farnell) Am I blind?eg.:https://www.digikey.com/products/en/connectors-interconnects/modular-connectors-jacks/366?k=&pkeyword=&pv69=3&sf=1&FV=140001e%2C1400008%2C3400030%2C4400070%2C4400077%2C4400088%2C4400005%2C4400054%2Cii1%7C2171%2Cffe0016e&quantity=&ColumnSort=0&page=1&pageSize=25As soon as I select surface mount, they are either CAT5e or unrated.Through hole is readily available but doesn't really work in this project.Do you know any suitable connector?The connector will be used in a 5GBASE-T network and I don't know how bad the influence of CAT5e would be here. Is it just less crosstalk?Thank YouLukas

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 16, 2018, 07:02:31 am
content: AIUI CAT5/6 only refers to the cables, CAT6 having a seperator to reduce crosstalk, so probably no difference between a CAT5 and CAT6 connector

author: LapTop006
author_rank: Unknown
timestamp: October 17, 2018, 10:55:45 am
content: Quote from: 1uk3 on October 16, 2018, 06:51:31 amWhy aren't you just using a magjack (which admittedly are also rare in surface mount)?Also, why not just standard 10g optical (trivial to surface mount)? Is this a wifi access point or similar run by PoE?

author: technix
author_rank: Super Contributor
timestamp: October 17, 2018, 11:14:38 am
content: I don’t think a few millimeters of sub-par cabling would hurt that much.

author: 1uk3
author_rank: Contributor
timestamp: October 28, 2018, 06:09:10 pm
content: Sorry for the late replyThanks Mike! That is exactly the answer i was hoping for.Quote from: LapTop006 on October 17, 2018, 10:55:45 amI have a 5G camera inside of a product but can not connect it directly to the panel. I has to run from the panel --> PCB --> patch cable --> camera (yes i have tried everything to get rid of the pcb step)Thanks you!Lukas

author: LapTop006
author_rank: Unknown
timestamp: October 29, 2018, 07:13:07 am
content: Quote from: 1uk3 on October 28, 2018, 06:09:10 pmUgh, ah.Can't just make a hole in the PCB to run an existing panel mount extension to?
Rj45 wiring of Fluke CIQ-SPKR CableIQ Speaker Wire Adapter - Page 1
Forum section: electronics / projects

author: 2vlado
author_rank: Newbie
timestamp: April 29, 2023, 02:45:19 pm
content: Hello.Recently I bought usedFluke CableIQwith almost no accessories. I would like to haveCIQ-SPKR CableIQ Speaker Wire Adapter. Since Fluke asks horrendous 89.99 USD, I decided to build it myself. However I'm not sure about the wiring colors of the RJ45 connector.Can someone please tell me wiring colors of the RJ45 connector? Thanks!

author: electrolust
author_rank: Unknown
timestamp: April 30, 2023, 04:31:41 am
content: Certainly it's either T568A or T658B. The relatedCLIP-SETadapter is wired T568A.

author: 2vlado
author_rank: Newbie
timestamp: April 30, 2023, 01:24:38 pm
content: So which one is it? T568A or T658B or something else? Do you own such adapter? Could you please share a photo of the RJ45 connector on the CLIP-SET?Thanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: April 30, 2023, 01:36:56 pm
content: if the picture is right it seems easythey crossed (looks like a kelvin mode)brown and brown / whiteorange and orange / whiteblue and blue / whitegreen and green / whitestandard networkk colors and pinout ?? see attached picture

author: 2vlado
author_rank: Newbie
timestamp: October 08, 2023, 02:08:16 am
content: After a long time I got back to this and built it. It works nicely. Thanks a lot for help!Recommendation for other people trying to build this: use high quality ETH cable with thick conductors (at least 24AWG - preferably Cat 6)
RJ45/8P8C connector balanced pair PCB routing - Page 1
Forum section: electronics / projects

author: forrestc
author_rank: Unknown
timestamp: February 17, 2016, 02:21:33 am
content: I'm yet again dealing with a RJ45 ethernet connector on a circuit board. Every time I do this I swear profusely about the 'split' pair which lives on pins 3 and 6 of the connector. With all of the other pairs, there are several good ways to connect to the connector pins and transition to a 100 ohm transmission line on the PCB (for varying values of 'good', depending on how anal you are about minor length differences, separation from other pairs, etc).But pins 3 and 6 are a challenge, especially since they tend to trap the pair from pins 4 and 5.Has anyone found a particularly elegant way to 'fanout' this connector?

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 17, 2016, 02:48:25 am
content: The Gigabit stuff I have torn down just route the 3/6 pair towards the front of the connector and then take a U turn to the coupling transformer.
RLC model of an Ammeter? - Page 1
Forum section: electronics / projects

author: Pack34
author_rank: Frequent Contributor
timestamp: September 21, 2015, 04:29:09 pm
content: I'm having an odd issue. I'm troubleshooting a battery charging design to charge a Li-ion battery. When everything is plugged in under normal operation the battery charges but with the battery connected the VBatt rail only raises by 0.5V. This gradually increases until the batter is charged. However, when a multimeter is connected in series to measure the current, the rail spikes up to the correct 18.5V during the duration of the charge.Typically when an instrument is attached and it works, it's some sort of grounding issue. However, the meter is connected in series because I'm measuring current.Is the RLC model for an ammeter really just a small series resistance? Or is there something more complicated going on that I'm missing.Chances are that it's some weird assembly error. I just wanted to verify what the electrical impact on using a current meter.

author: penfold
author_rank: Frequent Contributor
timestamp: September 21, 2015, 08:38:10 pm
content: I doubt its the RLC component, you're probably talking about 1uH series inductance with the resistance and with 10pF capacitance across the lot, depending how you model it.I would highly doubt its anything to do with that, unless you've got some high frequency stuff going on with the charging. The chances are that the resistance in your multimeter is somewhat higher than you expect.Would you not expect the charger to go into a constant current charging mode whereby the output voltage will drop to the voltage of the battery plus a little bit due to the charging current and internal resistances and therefore tracks upwards until the batter voltage reaches the desired charge voltage?

author: Pack34
author_rank: Frequent Contributor
timestamp: September 21, 2015, 11:27:28 pm
content: Quote from: penfold on September 21, 2015, 08:38:10 pmI wouldn't have thought twice about the current behaviour but a previous run of these boards had the battery voltage shoot up to the nominal value while charging. Perhaps it's stuck in a different charging scheme? But it's really odd that the presence of a current meter changes the behaviour to what a technician noticed on a previous run.The batteries are charging though, I guess I'll need to discharge a set of batteries and test the charging rates with and without a current meter to see if there's a difference.

author: DanielS
author_rank: Frequent Contributor
timestamp: September 22, 2015, 01:18:42 am
content: Quote from: Pack34 on September 21, 2015, 04:29:09 pmSince charging most batteries is done with constant voltage/current, your signal should have little to no AC components on it and the amp-meter behavior will be dominated by the current sensing resistor. The extra series resistance from the meter leads and the meter itself might be just enough to make your charger go from constant current (voltage increases progressively) to constant voltage.
RM6203 - switching PSU controller - Page 1
Forum section: electronics / projects

author: Chupacabras
author_rank: Regular Contributor
timestamp: February 15, 2016, 06:59:43 pm
content: Hi,is there anybody experienced with switched power supply circuits/controllers?I am looking into RM6203 datasheet. There is some typical application.1. But I don't understand what is the reason for capacitor C102. Is it isolated topology?

author: lukaq
author_rank: Regular Contributor
timestamp: February 15, 2016, 07:12:30 pm
content: 1. is that Y cap or how it is called? must be for something else, since it is wired in wrong place2. It is, you have transformer

author: Chupacabras
author_rank: Regular Contributor
timestamp: February 15, 2016, 07:20:43 pm
content: 1. I do not think it s wired in wrong place. I found more circuits with cap wired like that.2. There is transformer, but doesn't that cap bypass it? Couldn't it eventually pass some voltage to secondary?

author: TonyBurroughs
author_rank: Newbie
timestamp: February 15, 2016, 07:44:35 pm
content: Maybe that cap is for bypassing high frequency signals to ground so if there was noise on the incoming line it won't show up on the output.That's a guess though.

author: lukaq
author_rank: Regular Contributor
timestamp: February 15, 2016, 07:48:43 pm
content: Quote from: Chupacabras on February 15, 2016, 07:20:43 pm2. Well yes, but no: it is wired to high DC voltage, with almost only low freq. ripple of low amplitude and it is very likely a small value cap, so it won't pass much anything

author: Zero999
author_rank: Super Contributor
timestamp: February 15, 2016, 08:03:36 pm
content: It's a Y capacitor.Yes, it is in the correct place.It ensures both sides of the DC-DC converter are shorted together at high frequencies.Without the Y capacitor, high frequencies will be coupled from the switching transistor to the secondary side via the inter-winding capacitance of the transformer.The downside a small current from the mains can leak across the Y capacitor to the secondary.
RMS noise measurements using an oscilloscope  - Page 1
Forum section: electronics / projects

author: R_G_B_
author_rank: Frequent Contributor
timestamp: May 21, 2015, 10:18:23 am
content: Heres a practical example of RMS noise measurements using an oscilloscope.https://youtu.be/5Rk8I5BT2KUR_G_B

author: G0HZU
author_rank: Super Contributor
timestamp: May 21, 2015, 05:15:00 pm
content: I've seen this video linked to on here before and it's an interesting techniqueBack then I did try it with my old Tek 465 and got very good results. However, I didn't use quite the same test setup.This is because my main comment on the video would be that his scope 'tee' connection is going to load the 50 ohm output at frequencies above a few MHz so I'm assuming he used a noise source of limited bandwidth to prevent this issue being significant.In my case, my noise source extends well into the HF/VHF region so I made one direct connection to the scope via a thru terminator and used short connections to the other channel. This will give a much better broadband termination if the noise source bandwidth extends well up into the HF region.I guess a decent DSO would measure the noise voltage directly nowadays.
RMS-to-DC Problem - Page 1
Forum section: electronics / projects

author: Christopher
author_rank: Frequent Contributor
timestamp: September 29, 2014, 07:17:17 pm
content: Hi all.Going to go over this fairly quickly as it should make some sense and it's almost sleep time (been working on this for 8 hours)We are working on a High-voltage AC or DC to DC power supply, with digital monitoring.I am using an LTC1966 RMS to DC converter potting down the 900Vac (50Hz single phase) to something sensible, 0.9V. I then have a 1uF averaging cap and a LTC2990 ADC digitising the result. I know the ADC works perfectly fine as I am using this all over my designs with the same code.The problem I am having: When there is no load on the power supply, at 600Vac input, the output of the RMS to DC converter is all over the place, reading between 300Vac-900Vac. As soon as I put load on the power supply, the converter averages out to the correct voltage +- a few volts...We have a big-ass filter network on the AC input consisting of more magnetics and caps than you can shake a rusty stick at. I have a feeling this is causing us a few problems as we are measuring after the diode bridge & filtering. I have a seperate circuit measuring just after the diode bridge which is also doing the same thing.The only thing I can think of doing is increasing the averaging cap (which is a poor 1uF jellybean ceramic) to a 10uF with a different dialectric.I'll post some more information if I can't get it working tomorrow morning... But hopefully I am missing something very fundamental!Simplified schematic:

author: MK
author_rank: Regular Contributor
timestamp: September 30, 2014, 07:37:12 am
content: two thoughts:1, the PSU is not going to zero under no load.2, lots of filtering will mean that the RMS converter is not nesessarily seeing the correct waveform and reading the correct value.you may need a 100:1 or 1000:1 frontend of a suitable rating to look at what is happening using an oscilloscope.

author: tszaboo
author_rank: Super Contributor
timestamp: September 30, 2014, 08:13:18 am
content: The 1966 has high output impedance. That means, you cannot draw current from it, even the capacitor should be a low leakage, and you should buffer it with an opamp before using the signal. Did you buffer the signal?Other than that, did you AC couple the input? Maybe it is necessary.IMHO with the LTC2990 you leave lot of potential in the 1966, meaning you can make a more accuate system with a slightly better ADC.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 30, 2014, 01:13:25 pm
content: Have you thought about taking the easy route by measuring the DC bus voltage?
RN42 Bluetooth - Making an HID Host - Page 1
Forum section: electronics / projects

author: mclemens1969
author_rank: Contributor
timestamp: February 27, 2017, 02:52:47 am
content: I have incorporated RN42 bluetooth modules on my Atmel XMEGA uC projects for a few years. I have used them to send debugging text, and/or commands back and forth from android phones to the XMEGA using SPP.Recently I incorporated the HID version of the RN42. My goal was to allow my XMEGA to be an HID host and to read from bluetooth HID wireless joysticks.It seems that I cannot do that. It seems I can only make HID end devices. For example I could make my XMEGA look like a keyboard or a joystick to my PC.I am trying to do the opposite though. Does anyone know if its possible?thanksMike in Alaska
RN4678 Bluetooth module how to disable escape sequence for command mode? - Page 1
Forum section: electronics / projects

author: Karel
author_rank: Super Contributor
timestamp: February 17, 2025, 01:37:03 pm
content: I'm trying to figure out how to send binary data using a Microchip RN4678 Bluetooth module in Serial Port Profile mode.It uses an ascii interface with two modes: data or command mode. Switching mode can be done either by a gpio pin or by sending the escapesequence "$$$" or "---" to the module. The device sends binary data from a sensor to a host using this module (datarate about 18 KiB/sec.) andI prefer not to filter out this escape sequence in software in the (not so powerful) mcu of the device.Anybody knows how to disable this escape sequence? I couldn't find it in the manual...https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/UserGuides/RN4678-Bluetooth-Dual-Mode-Module-Command-Reference-User-Guide-DS50002506C.pdfedit: I found it, it's described in paragraph 2.3.19.
ROB304 (LM304) voltage regulator NOS chips - what to test for? - Page 1
Forum section: electronics / projects

author: RoGeorge
author_rank: Super Contributor
timestamp: February 05, 2024, 08:41:54 am
content: Found a few negative voltage regulatorsROB304. They have the same specs and internal schematic as in theLM304 datasheet, except ROB304 was made in the '80s by ICCE (Romania).Tried the chips on a breadbord (no load), and turned out 11 out of 15 are still working. So far tested them with an AWG used as a power supply (AWG was set for a 1Vpp sinus with a -9.5Vdc bias). Did a frequency sweep 20Hz-20MHz while looking at the regulated output swing with an oscilloscope, and while reading the exact DC value with a DMM (100uV resolution). Also wrote some Python scripts for automated testing and for saving the measurements.Some of the ROB304 are more stable and less noisier than others, and while the output seems well regulated, the absolute value varies as much as 20% from one chip to another. Don't know if this is so because the chips are from the grey market (might be factory rejects), or because they are many decades old, or because they were manufactured in the eastern block.Any ideas what else to test for, before removing the test setup from the workbench?

author: SeanB
author_rank: Super Contributor
timestamp: February 05, 2024, 10:47:09 am
content: Check quiescent current does not exceed the rated, and also would check, using another power supply, that the regulator will supply the rated 100mA at -5V output, when fed with -8V. 30 seconds max, as it will actually exceed max power dissipation in the regulator otherwise.Then load down with a 5mA load at -5V, and ramp the input voltage from -10V to -36V, and check the output is still within regulation, as this will apply about the maximum power dissipation, though you will need a TO100 heatsink on the devices, to prevent them overheating. 1 minute at -35V should stress them and fail any marginal ones, and I would not allow case to exceed 70C, measured at the base of the leads in the middle, where the die attach is.
robot and automation fair Automatica munich 22-23/6 2022 - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: June 27, 2022, 10:06:13 am
content: here are 30 short video clips from my tripdid you go too ?did you like it ?what was the coolest thing you saw ?https://youtu.be/SCXiC-xR_5A
Robot Arm Question (Battery Related) - Page 1
Forum section: electronics / projects

author: zarnold16
author_rank: Contributor
timestamp: November 05, 2015, 01:03:19 pm
content: I am building a dual robot arm for a school project. I have bought everything but the batteries so far. I will need 2 different constant voltage lines, 5V and 12V. One of the rules states I can't is Lead Acid batteries. Each arm will be separate, so I need 1 battery for each that will be enough for one arm. From my calculations, One arm will draw around 3500mA(does that value seem reasonable?) at peak I believe. (6 servos each and a stepper, being controlled by arduino mega). The entire event takes about 4mins to complete. I was wondering what battery route I should take and how I can get the 2 different voltages with efficiency?

author: Paul Price
author_rank: Super Contributor
timestamp: November 05, 2015, 06:51:01 pm
content: Your easiest and cheapest solution is to buy a new battery pack for an old laptop computer that has a >12V output. You would use a simple switcher IC or 7805 for the 5V supply and it is likely you could use a linear 7812 for any small current circuits you are using that require a clean 12V supply and the raw >12V output of the battery to directly power the motors/servos etc which would most likely tolerate a slightly higher unregulated voltage.I would find a discarded slow old laptop to be used just to charge the battery of interest and take it out from the laptop to power your robot. The older the laptop, the more powerful the battery.

author: pickle9000
author_rank: Super Contributor
timestamp: November 05, 2015, 07:37:42 pm
content: Cordless drill batts

author: Pack34
author_rank: Frequent Contributor
timestamp: November 05, 2015, 09:41:09 pm
content: What about some of those 12V battery packs people use for RC planes?
Robot Power Distribution Board Schematic - Page 1
Forum section: electronics / projects

author: rapsforlife
author_rank: Newbie
timestamp: November 03, 2020, 05:55:34 pm
content: Hey y'all! My robotics team is preparing for the University Rover Challenge and just completed revision 2 schematic of our power distribution board. Would appreciate a fresh set of eyes before we move on to layout.https://github.com/uwrobotics/MarsRover2021-hardware/blob/master/Projects/Power%20Distribution%20Board/Rev2/Power%20Distribution%20Board.pdf
Robot Teddy Bear + Kinect + Arduino + 3d Printed Skeleton  - Page 1
Forum section: electronics / projects

author: Erwin Ried
author_rank: Regular Contributor
timestamp: October 16, 2014, 05:59:15 pm
content: A little robot (puppet) I made, the 3d skeleton is fully custom and expandable to other "shapes" of stuffed animals. The application uses a very simplistic language (the variables are directly from the skeleton feed and face recognition data from a Kinect version 1), example:Code:# Faceservo3=180-(90+Max(-90,Min(90,Face_ay*2)))# Right handservo4=180-Max(0,Min(180,(ElbowRight_ay)*180))servo7=Max(0,Min(180,(WristRight_hw)*180))# Left handservo6=Max(0,Min(180,(Abs(ElbowLeft_ay))*180))servo5=180-Max(0,Min(180,(WristLeft_hw)*180))# Cheekspwm1=0pwm2=0And the communication with the arduino is via Firmata
Robotic Arm for SMT soldering. - Page 1
Forum section: electronics / projects

author: Shined
author_rank: Newbie
timestamp: January 21, 2011, 03:29:43 pm
content: I was struck with an idea a couple of days ago after browsing a local auction website and discovering a robot arm, merely a toy for kids to play with but it got me thinking, I'm a big guy and have massive hands so find it difficult to solder small fiddly things and SMT is an almost impossible tech for me to work with because its so fiddly so my idea was to combine a robotic arm with a small camera, a soldering iron and some software made to recognise where the solder marks are on a circuit board and have the robot do the soldering work for me.Do any of you think this is a viable idea or am I just completely nuts and should I learn some other way of getting around this SMT stuff.Your opinions welcomed.

author: KTP
author_rank: Frequent Contributor
timestamp: January 21, 2011, 03:45:52 pm
content: You would have better luck with a cartesian style robot which used a vacuum device to pick up parts from some type of reel or tube and placed them on the board which had previously had a solder paste mixture deposited on each pad. Hey, I should patent this!

author: scrat
author_rank: Frequent Contributor
timestamp: January 21, 2011, 04:11:13 pm
content: Quote from: KTP on January 21, 2011, 03:45:52 pmHmmm... there is plenty of SMT board mounting machines for production, but I see a small machine hardly feasible for an hobbist.Another idea could be making a helping "machine", I'll try to explain...At work we had thishttp://www.lpkf.com/products/rapid-pcb-prototyping/smd-assembly/smt-assembly/pick-and-place.htmmanual pick-and-place. It had two orthogonal slides, that helped a little moving the right way and were lockable by means of a button. Then you could rotate the component (picked up by vacuum), and place it finely by means of two "endless screws" (normal long screws used for that purpose). The camera with short focus (mounted on a movable arm) was a good thing.The whole machine was indeed quite rudimentary, but could work. In the end, we never used it, first because it was intended for reflow paste soldering, second because it took too much to place a component, so for our needs it was overkill.Using this kind of device (don't try to buy it, it costs toooo much!) for placing (maybe putting it on something like a light glue) before soldering wouldn't be a bad idea for very tiny packages.

author: CafeLogic
author_rank: Regular Contributor
timestamp: January 22, 2011, 02:36:49 am
content: Quote from: Shined on January 21, 2011, 03:29:43 pmGet a hot air rework station. You can get Chinese ones on eBay for $100. Tin the pads, then put flux down. You put the part in the vicinity of where it needs to go then tap it into place with tweezers or whatever. The closer you get, the lighter the taps. When it's on the pads blow hot air on it.I don't care if you are 6'8", 400lbs, and doofy as hell, you can do SMT just fine.
Robotic floor mop Li-ion conversion - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: September 05, 2020, 11:25:33 am
content: When I bought this product, it didn't work out of the box and after disassembling it, the internal NiMH battries were leaking acid so they needed to be replaced.I'd like to replace those cells by a single 18650 battery but the problem is for some reason the provided charger is rated at 6 V and 0.25 A and when I tried inserting the 18650 into the circuit and charging it, it would keep climbing above 4.2 V. I had to stop at 4.35 V since it would potentially explode and/or catch fire.I tried inserting diodes to drop the voltage down but it seems to limit the current to ridiculously low levels so it would probably take a week to charge the device that way.What else can I try to do to stop charging at 4-4.2V without limiting the current much?

author: Siwastaja
author_rank: Super Contributor
timestamp: September 05, 2020, 12:58:16 pm
content: NiMH has a very special charging algorithm.Remove the NiMH charging ICs and add a proper li-ion charger IC in place. Not your smallest project, though.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 05, 2020, 02:36:28 pm
content: Get one of those lithium charger boards that accept USB input and remove the existing charging jack to prevent it from being used. If you're using a bare 18650 instead of one with built in protection, you can get boards that also have the protection circuit built in.

author: tunk
author_rank: Super Contributor
timestamp: September 05, 2020, 02:44:16 pm
content: Is this any help:https://lygte-info.dk/review/Review%20Charger%20TP4056%20UK.htmlhttps://lygte-info.dk/review/Review%20Charger%20TP5000%204.2-3.6V%20module%20UK.html

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: September 05, 2020, 04:51:39 pm
content: Quote from: NiHaoMike on September 05, 2020, 02:36:28 pmThat's actually a great idea since those boards protect from overcharging.Why didn't I think of that?
Robotic Vacuum Cleaner (Sencor SVC 7020VT) - Reverse Engineering  - Page 1
Forum section: electronics / projects

author: Holup
author_rank: Newbie
timestamp: January 15, 2022, 10:32:23 am
content: Hi, I reverse engineered my vacuum cleaner because I was afraid my government is spying on me.Here is the result:Sencor SVC 7020VT/CIRCUIT DIAGRAM.pngSencor SVC 7020VT/PCB.pngAnd here is the User's manual:https://data.fast.eu/manual/40/40028063/40028063-im-en.pdf
robotools for robomow ,where do i find it? - Page 1
Forum section: electronics / projects

author: tjabas
author_rank: Newbie
timestamp: May 10, 2023, 10:35:56 pm
content: im about to replace the motherboard in my robomow rs 622 and of what i understand i need the robotools software to pair the new moterboard to the mower.i have tried with the other software called robomow toolkit, but i cant get it to work with that one.so if someone have the robotools software or any other idea please let me know.and ofcouse i could go to the local dealer to get this fixed, but i want to do it myself, i love to fix things myself
RoboVac Boundary Beam Detector (RBBD) ---What Wavelength?  - Page 1
Forum section: electronics / projects

author: SuzyC
author_rank: Frequent Contributor
timestamp: October 14, 2019, 12:38:21 pm
content: I want to build (clone) a tinier Robovac (boundary---Do Not Cross!) beam generator that can sit under a large sofa, but I first must be able to detect and decode the signal from the much too tall "Pepper Mill" shaped one that came with the RoboVac(it works well, just too big).I have tried aiming the beam at a 3-wire remote module salvaged from a VCR, which has no problem showing on my scope the output of my TV remote, but it completely ignores the RoboVac boundary beam unit's signal.Have also tried salvaging a two-wire infrared diode detector used to detect an End of Tape condition ( salvaged from a VCR) but again, no detection, but it clearly shows the pulse stream output of any of several VCR/TV remotes.Does anyone know what kind of detector and emitter is being used?The RoboVac I have is a WASCO model XR510A.Help! The poor thing always gets hopelessly stalled when it is tries to climb over the two supporting rods under the middle of my sofa!!!
Robust DC brushed Motor Driver - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 17, 2020, 11:46:09 am
content: Hi,I want to design a 5-10A , 36-52V DC brushed motor driver, and I know that there are tons of stuff out there, But I want to know who has done it better,and get some Ideas, Do we have some cool open source project for that, like the ODrive for Brush-less versions

author: max_torque
author_rank: Super Contributor
timestamp: June 17, 2020, 07:10:25 pm
content: make you life easy and use two high current smart half bridges, ie something likehttps://www.infineon.com/cms/en/product/power/motor-control-ics/brushed-dc-motor-driver-ics/single-half-bridge-ics/btn8982ta/won't get you up to your 52v, but will save a lot of hassle and be very robust (ime, you can dead short those ICs with a screwdriver across their output pins at fully current and they survive....)If you want to go to a descrete's solution then it's a LOT more work with mosfets and drivers etc and you'll have to provide all the necessary safety (overcurrent, shortcircuit, de-sat detection etc) yourself

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 18, 2020, 05:56:13 am
content: Thanks for the feedback, I'm interested in reading the motor Current too, this device does not provide this feature, also it seems that it has a supply voltage of up to 40V only
Robust solderable 0.1 inch board interconnects - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: August 28, 2015, 03:01:13 pm
content: Does anyone have any recommendations for multi-pole hand solderable board interconnects that have more robust pins than your typical IDC or D connector. Perhaps something similar to the old Centronics printer connector where the pins are held flat against a plastic support, or the original ISA bus connector used in old PCs.Mike
Roc rk3588 from firefly sourcing a mipi dsi screen help please - Page 1
Forum section: electronics / projects

author: psxpetey1
author_rank: Regular Contributor
timestamp: January 16, 2023, 05:48:55 pm
content: So im trying to source a mipi dsi screen on alibaba or aliexpres 5-7 inches. I thought mipi 30 pin was standardized but the amount of different pinouts ive recieved is quite large. My pinout is in the attached picture. I know they can have a different amount of data lines etc. will all mipi dsi screens be compatible with this? Anyway any help understanding / sourcing a screen would be awesome im trying to make a mobile android gaming device.
Rochester Electronics make cheap Maxim chips? - Page 1
Forum section: electronics / projects

author: rfleming
author_rank: Regular Contributor
timestamp: August 04, 2021, 12:20:07 am
content: Hi All,I have started working with the MAX8521 for a peltier controller and found on DigiKey that Rochester Electronics has the same chips sold through DigiKey (as a sale platform only) for Maxim original chips that are still in production. This isn't the first time I have seen this either, there have been a couple other ICs in the past (couldn't note any atm) that were also supplied by them through digikey as well.Has anyone had any experience with these (un?)licensed clones?https://www.digikey.com.au/products/en/integrated-circuits-ics/pmic-power-management-specialized/761?k=max8521https://www.digikey.com.au/products/en/integrated-circuits-ics/interface-drivers-receivers-transceivers/710?k=max8521Ryan.

author: ajb
author_rank: Super Contributor
timestamp: August 04, 2021, 12:29:15 am
content: Rochester is a licensed distributor for Maxim and a lot of other manufacturers, and Digikey now has this 'marketplace' thing that they appear to sell through. So I don't see any reason to assume these are clones, and in fact when I look at the ones you link to they show the manufacturer as Maxim and that they're sold by Rochester. Even if they were clones made by Rochester, they appear to do a fair bit of licensed manufacture of EOL parts, so if they're clones they ought to be on the up-and-up, since otherwise Maxim wouldn't let them distribute.

author: rfleming
author_rank: Regular Contributor
timestamp: August 04, 2021, 12:33:39 am
content: If that's the case, DigiKey is allowing a competing supplier to sell products on their own site and undercut them. They're obviously getting their cut, but interesting...I guess right now in Chipageddon, this still helps DigiKey to make a profit while they struggle to get push through their own ICs.
Rocket science + excessive number of uCurrents  - Page 1
Forum section: electronics / projects

author: qwaarjet
author_rank: Regular Contributor
timestamp: April 22, 2014, 11:08:17 pm
content: Thought I would share a picture of one of my companies experiments with FEEP thrusters that happen to use a large number of uCurrents as part of it DAQ system. The system measures the ion current from the thruster at multiple locations simultaneously avoiding the need to us a probe on an XY stage. The high voltages in the experiment often damages the uCurrents but they are easy to repair and have proven more cost effective than more traditional multichannel plates. One day we hope to scale up this experiment to over 1000 channels but I'll probably build custom hardware for that instead of buying the world supply of uCurrents

author: Psi
author_rank: Super Contributor
timestamp: April 22, 2014, 11:50:30 pm
content: Awesome.

author: EEVblog
author_rank: Unknown
timestamp: April 22, 2014, 11:57:16 pm
content: Sweet!

author: pickle9000
author_rank: Super Contributor
timestamp: April 23, 2014, 12:20:20 am
content: neat.

author: sacherjj
author_rank: Frequent Contributor
timestamp: April 23, 2014, 12:28:10 am
content: Yeah, you can't use 1000 uCurrents. They turn into milli-Currents.

author: calexanian
author_rank: Super Contributor
timestamp: April 23, 2014, 05:14:17 am
content: That's officially way cooler than the stuff we are working on.... When I was in high school I dreamed about going to work for somebody investigating ION propulsion.. I am stuck in our family business making irrigation related timers. Good work.. No awesome factor....

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: April 23, 2014, 05:37:42 am
content: maybe you could just buy loaded panels of uCurrents.but then you couldn't easily replace them as you blew them up.

author: brabus
author_rank: Frequent Contributor
timestamp: April 23, 2014, 07:52:11 am
content: Quote from: sacherjj on April 23, 2014, 12:28:10 amI made my day, thanks!
Rockville speakers with integrated DSP? - Page 1
Forum section: electronics / projects

author: cncjerry
author_rank: Unknown
timestamp: July 08, 2018, 02:50:06 am
content: I've been playing around with ADI's adau1701 and 1761 and found some Rockville active speakers that claim to have an ADAU1701 board, probably for a crossover, filtering, etc. I want to use the board to build a pair of active communications speakers for my IC-7610. I also have a couple of other adau1701 boards I use with my RF down converter for typical SDR demod. I am thinking of building a radio in a speaker with the adau1701 and a DDS with a small display on the side, volume, tuning, etc. This assumes Rockville left the I2C interface on the adau1701 exposed, I don't know why they wouldn't. So that's my question, I guess, has anyone played around with their active speakers?Here's a candidate:https://www.amazon.com/Rockville-APM5B-Powered-Monitor-Speakers/dp/B01LYAA0VW/ref=sr_1_1?ie=UTF8&qid=1531017769&sr=8-1&keywords=rockville+adau1701Having access to the integrated DSP board and SigmaStudio would give you a pretty cool little setup. I think SigmaStudio also has an active noise reduction algorithm (or you could code it up based on Frerking) and create an active communications speaker with intelligibility enhancements, noise reduction, bluetooth, etc for not much money.Thanks,Jerry

author: b_force
author_rank: Super Contributor
timestamp: July 08, 2018, 01:40:48 pm
content: I am not familiar with this specific brand, but basically most brands use some kind of variation of the Sigma family (and mostly over engineered and over specd)TI has and excellent DAC with onboard dsp but unfortunately their support and documentation is very user unfriendly.In most cases it's very easy to load your own firmware in all of these dsp ic's.
Rohde Schwarz Polyskop SWOB BN4244 1968 Test Repair Teardown - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: June 30, 2022, 08:55:10 am
content: is this the erly beginning of the network analyzer ?a 47mins video about my Rohde Schwarz Polyskophttps://youtu.be/_hxwzveyC-U

author: vk6zgo
author_rank: Super Contributor
timestamp: July 01, 2022, 07:30:56 am
content: Quote from: oz2cpu on June 30, 2022, 08:55:10 amIt is a Scalar Network Analyser.We used to carry SWOBs all over the State to test the antenna systems on TV transmitter sites back in the 1980s, but it is a long time since I have used one.We got Polaroid pictures of the huge display using a thing called a "Bigshot" camera.There was one for sale at a Hamfest a few years back, & I was tempted, but it was a 75one.That, & the sheer mass of the thing put me off.Two people carrying the Polyskop a short distance from the car into a site is one thing, lugging it singlehanded halfway down the street to my car was totally another!

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 01, 2022, 10:40:12 am
content: you bet !! it is so far my top score in weight for one unit :-)maybe why it is equipped with that many handles, made in a style and quality rarely seen
ROHM AC/DC converter and mTouch - Page 1
Forum section: electronics / projects

author: Isaac Newton
author_rank: Contributor
timestamp: October 10, 2012, 07:41:18 pm
content: Hi guys,I was looking for an AC/DC converter to use on a project. Since the space is a major concern, I opted for pre-built modules and found that theBP5045A5had the perfect voltage and current output for my aplication except for the fact that, instead of 5V, it outputs -5V. It would be okay for most aplications, but since I want it to power up a mTouch capacitive touch aplication, I'm a bit concern about how it would affect the response of the sensor pads, since the pads have to couple with ground to "generate" a capacitance, and the Earth ground is more than 100v below the Logic ground that it generates, depending on the voltage aplied to the input of the module. It's important to know that the module is non-isolated.My question is: are my concerns true?Thanks
Roland E-70 keyboard with noise on right channel - Page 1
Forum section: electronics / projects

author: frisc0
author_rank: Regular Contributor
timestamp: June 19, 2022, 09:00:34 pm
content: I have a Roland E-70 keyboard that is working great, however while not playing the right channel/speaker is constantly producing (digital) noise. The other channel/speaker is decently quiet. The noise on the right channel is audible on both the speaker, headphones and line out.I've looked at the service manual (https://www.synthxl.com/roland-e-70/) and I suspect the muting circuit, around Q6, but I have no idea how to diagnose this.Attached is an audio sample of hitting a key and recording (phone mic near right speaker) the noise.Any suggestions on how to diagnose/pinpoint the faulty part(s)? Thanks in advance for your help!

author: moffy
author_rank: Super Contributor
timestamp: June 20, 2022, 01:39:36 am
content: I opened the noise file in Audacity and zoomed in and it had a repetition frequency of 120Hz. So I assume you are somewhere that uses 60Hz mains frequency and that the noise is power supply related. Nice that you provided the noise file. It isn't the mute, you wouldn't want to hear that noise when playing. Best bet is that some electrolytic capacitors in the PSU have lost their values.

author: frisc0
author_rank: Regular Contributor
timestamp: June 20, 2022, 09:49:35 pm
content: Hi moffy, thanks for your response and your time to analyze the audio sample! In my country mains is on 50Hz, so can it still be the PSU? And the noise is only on 1 channel, any suggestion on how to further diagnose? Caps seem okay on the PSU/Amp board. I can get a scope to check in more detail.Btw : I saw I used the wrong forum for my post, I'll continue on the Repair forum :|

author: moffy
author_rank: Super Contributor
timestamp: June 21, 2022, 02:11:45 am
content: That is wierd, as the noise is repetitive and based on the sampling rate, 44.1kHz, it repeats every about 360 samples which gives about 122Hz so the assumption of 60Hz rectified noise. Look for something at that frequency.P.S. It could be B2(123.47Hz).
Rom File Format - Page 1
Forum section: electronics / projects

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: May 23, 2016, 09:59:47 am
content: I prefer there SREC format as it's what I'm most familiar with and it's supported at least by my device programmer. Appreciate if someone with one of the generic universal programmers confirm if these also support this format or comment on the format preferred by these.

author: Rerouter
author_rank: Super Contributor
timestamp: May 23, 2016, 10:23:03 am
content: perhaps zip a sample file?, If you can change it to .bin or .hex and it still veiws the same in a normal editor then its fine, if it appends its own crap, that can make things harder when sharing stuff,

author: macboy
author_rank: Super Contributor
timestamp: May 24, 2016, 04:11:04 pm
content: I have a TL866 "MiniPro", which I suppose qualifies as a generic universal programmer. It supports .bin (raw binary) or .hex (intel hex). It does not support motorola S-record.

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: May 24, 2016, 08:56:20 pm
content: Quote from: macboy on May 24, 2016, 04:11:04 pmThank you, that's exactly what I needed to know.
root of trust boot - Page 1
Forum section: electronics / projects

author: rakeshm55
author_rank: Regular Contributor
timestamp: October 12, 2018, 11:50:17 am
content: Hi,I am using a processor Am571x (Sitara) in one of my project.I want to have a secure boot for processor so that kernel integrity could be established... In the data sheet I could not find such a feature...In case of processor not having secure boot feature how to bring in secure boot ability for the processor....
Rosewill RCX-Z200 fan voltage - Page 1
Forum section: electronics / projects

author: dgminala
author_rank: Contributor
timestamp: May 04, 2018, 03:41:43 pm
content: I have a project needing a good amount of cooling/heating. A small environmental chamber for determining the temperature characteristics of various types of components (voltage reference diodes & ICs, resistors, capacitors, etc.). I have an idea for a couple of Peltier modules that can be controlled to heat or cool the chamber to specific temperatures (and accurately measured). I have a friend who has a couple unused Rosewill RCX-Z200 CPU coolers that look up to the task.I haven't been able to find any documentation that specifies the fan voltage for that module. Can someone help with that bit of info?Thanks!!Dave M

author: grifftech
author_rank: Frequent Contributor
timestamp: May 04, 2018, 07:19:10 pm
content: most CPU coolers use 12volts

author: dgminala
author_rank: Contributor
timestamp: May 05, 2018, 03:57:12 pm
content: Quote from: dgminala on May 04, 2018, 03:41:43 pmQuote from: grifftech on May 04, 2018, 07:19:10 pmThanks for that. I suspected that would be the case, but not sure. Was hoping it would be a 5V fan, since I already have a 5V source for my project, but a small 12V source won't add a lot to the size of the PCB.Thanks!!!Dave M
Rotary Encoder breakout board w/ hardware contact bounce - Page 1
Forum section: electronics / projects

author: Bootalito
author_rank: Unknown
timestamp: April 19, 2018, 10:09:01 pm
content: I just created a small breakout board for the EC11 Rotary Encoder that I think would be pretty useful for people.1. Breadboard Friendly2. Hardware contact debounce (10uS time constant). Stop using that software debounce rubbish! Software should never be a solution to a hardware problem!3. 5-pin JST PH (2.00mm) connector on bottom of PCB for integration into a larger project. e.g. panel mount the Rotary Encoder with this PCB attached to the bottom, and run wires to a main project PCB. This will save PCB space for hardware debounce. Alternatively you can use the 100mil spaced headers too of courseHere is a link to the schematic and PCB. You can download the Gerbershttps://easyeda.com/terryjmyers/ec11rotaryencoderbreakoutboard_copy(updated to new version)I suggest JLPCB, 1mm thickness, and use the "Panel BY JLPCB" in the x:3*Y:5 configuration to give you 15 boards on a PCB and you'll get 150 breakout boards for $2 (plus like $20 for shipping...but still)! If anyone wants to pay postage I'll send some too you, or if you are West of Philadelphia I can hand some off to yah. I mean...what am I going to do with 150 of these, I needed like 20..at most...for all time. How do they even make a profit?!(caps and resistors are unpopulated)

author: MarkF
author_rank: Super Contributor
timestamp: April 21, 2018, 04:51:13 am
content: It looks to me like you picked the signals from the wrong point in the filter circuit.The signal should be tapped between the resistor and the capacitor.See the suggested circuit for a PEC11 encoder:

author: Bootalito
author_rank: Unknown
timestamp: April 21, 2018, 08:08:18 pm
content: Unfortunatly I believe you are right!I looked back at another project where I used a rotary encoder and somehow got that module messed up from then until now....

author: Bootalito
author_rank: Unknown
timestamp: April 21, 2018, 08:48:37 pm
content: Quote from: MarkF on April 21, 2018, 04:51:13 amUpdated original post to new version (didn't change PCB images...too lazy)

author: Dave
author_rank: Super Contributor
timestamp: April 21, 2018, 11:41:00 pm
content: You don't really need hardware or software debouncing of a quadrature signal, if you are handling it as such in code.
Rotary Encoder Suggestion Request - Page 1
Forum section: electronics / projects

author: rfdes
author_rank: Regular Contributor
timestamp: December 05, 2021, 08:55:37 pm
content: Hi -I own a Taiwanese made power supply that works well but the 2 rotary encoders for setting the voltage/current limit has a mechanical issue that bothers me. I want to replace them with something a bit more stout. The issue that I reference is that there is excess play between the mechanical detents. When wiggling the knob, the knob will deviate maybe 1/2 deg or so. Maybe my encoders are simply wore out or poor quality. I am confident that the Bourns PEC12R-4217F-N0024 would be a drop in replacement but am wondering about this 'knob' slop I refer to. Do encoder vendors specify this parameter? Does anyone have any suggestion/recommendations regarding this mechanical issue?thanksJim