hybridfree/eevblog-posts huggingface dataset:
RC2014 Z80 computer kit. - Page 1
Forum section: electronics / projects

author: hamster_nz
author_rank: Super Contributor
timestamp: December 05, 2016, 09:27:19 am
content: Just finished debugging the RC2014 Z80 retro-computer computer kit that I got in the Black Friday/Cyber Monday sales. It is well made, and went together pretty well, apart from one duff solder joint I made on the D6 signal on the black plane that tripped me up for an hour or so.If you are interested, have a look athttp://rc2014.co.uk/for more info.Next up, building the Raspberry Pi Zero serial terminal card... (Yep, a ARM board with megs of memory as a terminal for a Z80 - silly but fun).
Chip  dating (photo inside) - Page 1
Forum section: electronics / projects

author: 001
author_rank: Super Contributor
timestamp: October 05, 2019, 09:59:54 am
content: Hi!TI chip marked as040Is it 40 week of 1980?

author: amyk
author_rank: Super Contributor
timestamp: October 05, 2019, 07:15:23 pm
content: Pictures please...

author: DaJMasta
author_rank: Super Contributor
timestamp: October 05, 2019, 07:21:37 pm
content: (photo inside) *no photo*In any case, a picture would help us, but maybe this would help as well: TI appnote szza020c

author: floobydust
author_rank: Super Contributor
timestamp: October 05, 2019, 07:33:51 pm
content: I've never seen vertical text for marking date codes on a PDIP. TI databook RC4558 was a new die in 1990, I think the RC4558Y. The IC goes back to 1976. Anything on the underbelly i.e. Malaysia.

author: 001
author_rank: Super Contributor
timestamp: October 05, 2019, 07:55:36 pm
content: Quote from: floobydust on October 05, 2019, 07:33:51 pmYeaMalaysia TIVertical numbers like this
RC5 questions - Page 1
Forum section: electronics / projects

author: jlcstrat
author_rank: Newbie
timestamp: January 23, 2010, 06:20:44 pm
content: I've Googled my brains out for days, and can't seem to find out an answer. With RC5 remote controls, is there a modulated carrier that the pulses are on? I know the highs are pulsed around 36Khz, but is this signal modulated again with a steady 36khz wave? I need to write the c-code for a pic, and it would be much easier if there was no "second" modulation.

author: jahonen
author_rank: Super Contributor
timestamp: January 23, 2010, 06:54:46 pm
content: I'm not sure what you mean by second modulation, but with Philips RC5 code, Logic 0 is sent as 889 µs burst of 36 kHz carrier and then 889 µs of "silence". Logic 1 is respectively other way around. I thinkthis pageshows it quite clearly.Regards,Janne

author: jlcstrat
author_rank: Newbie
timestamp: January 23, 2010, 06:58:45 pm
content: Thanks, that's what I thought. I read a couple things that suggested that that pulsed waveform was then modulated again with a 36Khz sine wave. That was where I was having a hard time coming up with any sort of code.

author: Thermal Runaway
author_rank: Contributor
timestamp: January 25, 2010, 07:13:08 pm
content: Hi, what are you up to with RC5? I designed and built an RC5 decoder earlier in the year, just for fun, and so now I know the RC5 protocol backwards. I can probably help you with any questions about the protocol, or how to use it in a project.Check it out in prototype form:And in a first build form:I have started writing an explanation of RC5 which will build into a tutorial on how to design a project that uses it. But it's not finished yet.Brian

author: jlcstrat
author_rank: Newbie
timestamp: January 28, 2010, 02:00:53 pm
content: Brian, I saw your pics on another forum. I might be changing protocols. This is just a project for school, and I don't have any remotes laying around that use RC5. I think I'll just take the most convenient device and base it around that. I'll definitely find you if I get stuck.

author: Thermal Runaway
author_rank: Contributor
timestamp: January 28, 2010, 04:58:09 pm
content: I used a Philips Universal Remote to generate RC5 codes. It's good because you can select from TV, VCR, SAT1, SAT2 modes - this gives you the option of sending commands with different addresses.Yeah sure - give me a shout if you need any help.Brian
RC522 RFID reader - Page 1
Forum section: electronics / projects

author: xantharian
author_rank: Newbie
timestamp: May 21, 2014, 05:41:05 am
content: Hello there,Have anyone tried this pretty cheap RFID reader with the NXP mfrc522 chip on it?I spent two whole days to get it work on a Raspberry Pi (source code attached - it's a ported example script, based onthis one).I succeeded with the porting, at least I have fine communication with 7Mbit/s, I can ask for version properly, and do everything else. So no problem with the communication.But when the example code tries to read any cards, it fails, no matter what card I try to use (all 13.56Mhz mifare cards of course).Reading thedocsand debugging, I stated that the problem is that it's not generating the RF field. (There's a register called Status2Reg, which tells me what state is the modem in; well this state is usually TxWait aka "Wait until RF field is present")Further tracking, it's clear, that something switches off the antenna after I switch it on. So, although it does TxControlReg |= 3 (and I can confirm it in that moment, it gives back &3=3), later (when it's in TxWait state) reading back TxControlReg&3 gives 0.Do any of you have any small ideas why is this happening?Thanks a lot, have a nice day!
RCA VIC WR-50c - Page 1
Forum section: electronics / projects

author: ttx450
author_rank: Regular Contributor
timestamp: August 01, 2023, 10:35:54 pm
content: Anyone have experience with using this unit?

author: coromonadalix
author_rank: Super Contributor
timestamp: August 01, 2023, 10:45:28 pm
content: http://www.bitsavers.org/pdf/viz/VIZ-RCA_RF_Signal_Generator_WR-50C.pdfattached here too

author: ttx450
author_rank: Regular Contributor
timestamp: August 01, 2023, 10:50:13 pm
content: Thanks, have that. Looking for someone that has used the WR-50c
RCD and inverter - Page 1
Forum section: electronics / projects

author: Saull
author_rank: Contributor
timestamp: August 29, 2018, 02:55:57 am
content: Hello,I have offgrid cottage which I am powering from inverter. I would like to add RCD for protection. The problem is that I have no earth connection. How do I connect RCD in that case ?Best regards, Saull.

author: ejeffrey
author_rank: Super Contributor
timestamp: August 29, 2018, 03:02:27 am
content: The inverter needs to be grounded properly at the inverter output or the electrical panel.The RCD itself doesn't need a ground connection. It measures the difference between live and neutral current.

author: djacobow
author_rank: Super Contributor
timestamp: August 29, 2018, 03:11:20 am
content: Others will give more detail, but an RCD does not need an Earth to provide protection.Of course, depending on where you are, the rules might state you have to have one.If it were my cottage, I would put in an Earth connection, bonded with neutral right at the "main panel" where service comes in, which in this case is the output of the inverter.A ground rod, clamps, and wire is not an expensive investment.
RCD and main swith Isolator in Equipment - Page 1
Forum section: electronics / projects

author: wilmer
author_rank: Contributor
timestamp: May 28, 2021, 09:51:10 am
content: Hello,I am designing a equipment and the drawing were checked by an external company. I am use to put the RCD for the whole panel and in the main isolator include the neutral line. That is what I had seen in other companies.The last time I talk to them and their justification of not isolating neutral is that the field electritian should check that neutral is not switched by Line. (OMFG) they have not seen the instalation around the world that I had. They also corrected my drawing to only protect two outlets with RCD. That means the main power supply is exposed to leak to earth if the outside installation is not done properly.Now, I will have my own electritian and I am tented to tell he/she to do it my way?am I correct?This is the first time that I see an RCD who doesnt protect everything( take in note that I sually design is automation systems and my only AC design is from AC to power supplies.Thanks for the comments in advance....(Keep the comments PG)

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 28, 2021, 10:30:03 am
content: https://www.ecmweb.com/content/article/20885488/switching-the-neutral-whats-the-controversy

author: wilmer
author_rank: Contributor
timestamp: May 28, 2021, 10:47:12 am
content: https://www.qsl.net/ac5jw/isbp/neutral.htmlI personally had an eletrocution doing a maintenace in a 120v AC system ( not in australia) because somebody switch L and N in the panel.I always basically follow :https://www.electrical-installation.org/enwiki/Isolation_of_the_neutral_conductor
rcwl-0516 microwave radar sensor (design issue) - Page 1
Forum section: electronics / projects

author: fedimakni
author_rank: Regular Contributor
timestamp: June 16, 2021, 03:40:56 am
content: Hello,I came across the rcwl-0516 microwave radar sensor and i wanted to build the same device.While doing some research on the internet i found this pagehttps://github.com/jdesbonnet/RCWL-0516which mention a lot of details about the pcb and as the chip used in this module (RCWL-9196) is not available i tried to build one using BISS0001 which is an alternative as mentioned in the link.I almost copied the same design with the same length of track the same components and same positions and design the pcb by myself but i am still not able to make the device work. I don't even know if the pcb is 2L or 4L. the one i made was 2L, here's a link of my projecthttps://oshwlab.com/fedi.makni_7437/rcwl-0516Did anyone tried this one before?How was your experience. could you assist me with some advice?Thanks a lot for your help.

author: morgan_flint
author_rank: Regular Contributor
timestamp: December 08, 2022, 09:47:08 am
content: I know this thread is quite old, but just in case it's still of help... KO4BB analyzed the modulehere, and in that page refers to his own designhere. Maybe there are the details you're looking for
RCWL-0516 Reverse engineering Motion detection sensor - Page 1
Forum section: electronics / projects

author: fedimakni
author_rank: Regular Contributor
timestamp: June 08, 2020, 11:45:26 am
content: Hello,I wanted to reverse engineer the RCWL-0516 by designing my own PCB. I followed the link below and i understand how the pcb workhttps://github.com/jdesbonnet/RCWL-0516Attached a pic of the top side of the pcb Capture5Attached a pic of the bottom side of the pcb Capture6I also desoldered the same component from one working pcb and solder them to my pcb but without success.I couldn't understand what could cause the problem? Do my antenna design could contain some mistake?Do anyone have an idea how to fix it or what i should do?Do anyone have the gerber file for the real working pcb so one could intergrate them easily in his design?Looking forward to your help. Thanks

author: JBeale
author_rank: Frequent Contributor
timestamp: June 08, 2020, 02:42:29 pm
content: I gather that board operates around 3 GHz. How much experience do you have with microwave PCB circuit design? I don't have much, but I've worked with others who do. Every detail of that board, including the components, the exact shape and width and thickness of every copper trace and via, soldermask and silkscreen, the resin and fiberglass and processing of the PCB itself can have some effect on circuit operation at those frequencies. Developing such boards requires a lot of cut-and-try patience even with adequate test equipment like network analyzers covering the frequency of interest to measure the actual signals, behaviors and interactions. Even working at much lower frequencies (433 MHz) I know there are significant batch-to-batch variations of boards from the exact same design files, presumably due to dielectric constants of the particular FR4 material each time, and maybe process tolerances and things like humidity. Doing this kind of development without such test equipment would be a real challenge.I don't know what the current state-of-the-art is, but at least a few decades ago I know that the standard approach was to use expensive teflon-based boards around these GHz frequencies (eg Rogers Duroid), because typical cheap FR4 material is so variable and poorly characterized it's hard to know how a circuit will behave when femto-farads of change in capacitance start to become significant.

author: Clarisah
author_rank: Newbie
timestamp: May 26, 2022, 04:33:58 pm
content: Hello, I’m working on the same project as I would like to embed it in my PCB design for another application. You design looks like a perfect match, did you get it to work in the end?
RD DPS5015  (50V/15A )  and DPS5020 (50v/20A) digital power supply rippple test  - Page 1
Forum section: electronics / projects

author: RD Tech
author_rank: Regular Contributor
timestamp: July 31, 2017, 07:38:45 am
content: This is ripple test for DPS5015 .https://www.youtube.com/watch?v=QbcLtOT1IAQ&feature=youtu.beProduct page:https://www.aliexpress.com/item/RD-DPS5015-Constant-Voltage-current-Step-down-Programmable-digital-Power-Supply-buck-Voltage-converter-color-LCD/32702714880.htmlupper competer page:https://www.mediafire.com/folder/3iogirsx1s0vp/DPS_communication_upper_computerThe required instruments and requirements for test :Oscilloscope ? Probe *1, IT6721 power supply 58V +, 20M bandwidth limitation.Oscilloscope Vertical resolution 50mV , Controling DPS5015 by the upper computer.we are *1 probe test , VPP is about 100mV,we also use *10 proble to test , but *10 Probe can cause extra interference to make measurement VPP higher .we also make ripple test for DPS5020.https://youtu.be/i62bFRMdgPwDPS5020 page :https://www.aliexpress.com/store/product/RD-DPS5020-Constant-Voltage-current-Step-down-communication-digital-Power-Supply-buck-Voltage-converter-LCD-voltmeter/923042_32821185351.html?spm=2114.10010108.1000023.29.Up1mtg

author: floobydust
author_rank: Super Contributor
timestamp: July 31, 2017, 04:56:39 pm
content: That is pretty quietNo extra output filter needed. Nice.I see 50mVpp no-load and 75mVpp at 3-10A, and 100mVpp at 15A, f=90kHz (I believe but not sure).Ordered a DPS3005 (30V 5A) and look forward to trying it out.The communication -C option with USB and Bluetooth boards looks very good. I should have ordered it.It might be possible to make voltage waveforms, ramp, pulse with the PC software?

author: alm
author_rank: Super Contributor
timestamp: July 31, 2017, 05:55:21 pm
content: Your links do not work: the part after the ellipsis (...) is missing.

author: floobydust
author_rank: Super Contributor
timestamp: July 31, 2017, 05:59:35 pm
content: Mods, suggest merging this thread with this one about the DPS5015:https://www.eevblog.com/forum/testgear/testreview-of-power-supply-frontend-dps5015-50v15a/

author: RD Tech
author_rank: Regular Contributor
timestamp: August 01, 2017, 07:23:10 am
content: Quote from: floobydust on July 31, 2017, 04:56:39 pmthe result will be different for different test device.did you buy communication version? if yes, you can show your test resultabout the voltage wave , I don't know what you want to do. you can try

author: RD Tech
author_rank: Regular Contributor
timestamp: August 01, 2017, 07:29:21 am
content: sorry, it is some mistakes, I fixed it , you can check it again

author: RD Tech
author_rank: Regular Contributor
timestamp: August 01, 2017, 07:31:09 am
content: Quote from: floobydust on July 31, 2017, 05:59:35 pmyes, this is our friends test toobecause many friend need ripple test , but we don't have much time ,. so we only a video for riplleit should be very clear
RDA5851SX Module (BT24G03) needs help. - Page 1
Forum section: electronics / projects

author: kripton2035
author_rank: Super Contributor
timestamp: April 17, 2017, 08:23:55 am
content: Hi All,I want to connect an old radio to my phone using bluetooth. the radio is not that old, as the audio between the cd drive and the radio is an I2S link. so after a while, I found this BT24G03 bluetooth module :here is the amazon link (but I bought it on ebay) :https://www.amazon.com/Bluetooth-Audio-Module-Supports-Radio/dp/B012W0I7OQI made a small board for it, to power it at 3.9V, to get the audio pins, and some buttons to play and pair the phone.the antenna signal is going to an sma connector, throught a pi network with L=1uH and C=1nF.problem is: I don't have any bluetooth id visible ...when I power the module, it consumes 21mA, when I hit reset, it comes down to 3mA, then to 21mAbut no bluetooth to connect to.did I miss something ?anyone with some experience on these modules ?there seems to be other same looking modules, but with only analog audio.like this one :http://www.ebay.com/itm/391673900741
Re-design of simple RC robotic dog toy. - Page 1
Forum section: electronics / projects

author: thundertronics.com
author_rank: Contributor
timestamp: November 18, 2021, 02:56:12 am
content: Update:https://www.thundertronics.com/toydog.webm(1.3mb) - small demo video, shows control of 7 motors using stm32f103 board and four TB6612FNG brushed DC driver modules.I started around one year ago. It is harder than I thought, but It's certainly doable.This toy is pretty good. But there are some problems:1. It moves and rotates too fast, too difficult to maneuver2. One of the legs often got stuck, and internal firmware can't proceed with moving sequence, probably rotary sensor problem3. Just a few tricks/sounds, can become boring quicklyI want to perform full re-design of main board and remote control board, mainly for learning purposes, and try to build some robotic toy on my own next time. After disassembly I've discovered 7 motors (4 motors for paw wheels + 2 motors for back legs + 1 motor for front legs).I did a quick proof of concept test with stm32 board and TB6612FNG brushed DC driver modules. Although it moved, it was a mess of wires:Then I decided to design a small board to replace all wired connections. This board will allow to connect stm32 development board, four TB6612FNG modules, one NRF24L01P module for wireless remote control and one MP1584 module for providing 5v.
Re: Higher voltage joule thief... - Page 1
Forum section: electronics / projects

author: Fungus
author_rank: Super Contributor
timestamp: July 02, 2024, 08:46:59 am
content: After my recent disassembly of a filament bulb I found myself with 4 high voltage "filaments" on my hands (48V?)I found out I can make them flash by attaching an inductor to them and tapping the wires on a "dead" D-cell battery.Now I'm trying to figure out how to build some sort of joule thief to light them up.

author: CaptDon
author_rank: Super Contributor
timestamp: July 02, 2024, 12:41:14 pm
content: If you tape the wires to the battery you get a dead short through the tiny inductor. Brushing or scraping the wires across the battery will give enough inductive kick to flash the lamp. And what is the goal of this post?

author: The Doktor
author_rank: Regular Contributor
timestamp: July 02, 2024, 12:58:53 pm
content: I think the goal of the post is to get some advice on building this higher voltage joule thief. And I think the answer is to build it much like the original, but with a higher turns ratio.

author: jzx
author_rank: Regular Contributor
timestamp: July 02, 2024, 01:10:03 pm
content: You can build the joule thief and add a secondary winding to have a higher voltage. You will need a rectifier for the leds, for this you can use a bridge with 4 1n4148, but the 1n4007 are slow.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 02, 2024, 04:27:25 pm
content: Yes, the standard circuit will do, plus a high ratio secondary. You'll want it a bit better optimized for power, as those filaments will be on the order of one watt (or a modest fraction thereof).Getting say 48V directly off a single BJT blocking oscillator, isn't the easiest thing, or the most friendly to the BJT. But getting say 5 or 10V off it, then a 5-10x transformer, will light those easily.For reference, here's a trusty one I made years ago, and still use regularly:Circuit is the basic blocking oscillator,with +V = 1.2V (NiMH cell), Rbias = 100R, Cbb = 1uF (there's a 22uF on the supply as well), Rb = 0, and, I think Ns/Np was a little less than 1..?! You can almost count it in the photo, but mind the primary is 2 x 28AWG bifilar. LED is simply connected Output to GND. Switch is off/1k/100R just for a little dimming option. BJT is PBSS303NX, a modern low-Vce(sat) type of excellent ratings, well suited to low voltage, high efficiency converters like this: with a rectified output (so, including diode loss), I measured ~60% efficiency I think, at around 3V 1W output, so it's not doing too bad at all.The major mistake that the common circuit makes, is using Rb instead of Rbias, and no Cbb. This ensures poor base drive during switching, and high switching losses. It's a kitschy thing anyway, efficiency hardly matters, it blinks a light, so the poor circuit persists online (thus, it takes on a life of its own -- it is a meme as such).Doing basically the same thing, but say 20t primary, 15t feedback, and 100t output, should light that filament quite nicely.Tim
Re: HX711 - Page 1
Forum section: electronics / projects

author: alizare368
author_rank: Regular Contributor
timestamp: December 09, 2018, 01:58:54 pm
content: HiI designed a board for weight measurement with load cell sensor and using HX711 for high accuracy.How can I calibrate it for milligram(mg)?the output of ADC(HX711) and C CODE contract in txt files.How can I stable the output?How can I implementation it with order 10 FIR lowpass filter?
Re-programmable audio playback device for personalized messages - Page 1
Forum section: electronics / projects

author: beeboopbeep
author_rank: Contributor
timestamp: November 03, 2018, 03:59:41 am
content: Hi everyone,I was helping with the development of an audio playback device that can be programmed via desktop app and wanted to share the progress so far. Any feedback regarding the product would be greatly appreciated!Introduction video here:The device can playback any audio uploaded to it and the desktop app allows you to upload MP3 and WAV files, or you can use the computer mic to record personal messages (currently, only available on Windows). We opted for a desktop app for maximum customization and for future firmware upgrades. There are currently two models developed: push button activation and light sensor activation.The circuit consists of an STM32 uC with USB connection capability and a DAC that outputs to an AB amplifier. The batteries for the device are two lithium coin cells each having 3 V, 600 mAh.

author: beeboopbeep
author_rank: Contributor
timestamp: November 03, 2018, 06:44:11 am
content: Quote from: blueskull on November 03, 2018, 04:56:07 amFrom looking at the prices of the ICs in your link (e.g., ~7 USD for 1K units of ISD15102 for 2 minutes of playback which is same as ours), our device would be along the same price point (i.e., device includes MCU + amplifier + flash). The differences I see between the IC in your link and our device are that our device has USB capabilities but our device is not verified for industrial applications. I'll take a closer look at these ICs as I have never came across them before and may be useful in future projects!I agree that there are devices in China that can provide more capable solutions than our device. We are aiming to provide a desktop app along with the hardware to allow the user to customize the audio playback as much as possible. This includes simple but streamlined audio editing capabilities (e.g., adjusting volume that will be played on the device, audio file trimming, and preview before uploading), direct audio recording from mic without having to use external software, and allowing ordered or shuffle playback (as well as single or continuous playback) modes when the device is activated.

author: beeboopbeep
author_rank: Contributor
timestamp: November 03, 2018, 07:11:25 am
content: Quote from: blueskull on November 03, 2018, 06:49:37 amWould you recommend the flash ICs from GigaDevice and MXIC for low clock rate data transfer requirement such as this project? If you could share any experience with these flash ICs or know someone who've used them without issues, we'd greatly appreciate it.Regarding our device, we've been using Adesto flash ICs for several months and never ran into any issues during our initial prototyping phase and after continuously running our tests.
RE46C165 (etc) Photoelectric Smoke Detector - Application note? - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: January 19, 2021, 10:18:14 am
content: Data sheet:https://ww1.microchip.com/downloads/en/DeviceDoc/20002251B.pdfIt seems to be lacking some detail on component selection, circuit design and how to make use of "diagnostic mode" for setting up tests on a new product.For example the resistor network on pins 1, 2, 3 - I suppose preset R2 sets sensitivity, what are the design criterea?R5, maybe this is needed for speed or...?
RE46C165/6/7/8 Photoelectric Smoke Detector - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: February 03, 2021, 04:05:09 pm
content: I'm looking for some background on this family of smoke detectors because the DS is a bit light on detail. For example, what IR diodes to use and how the values RADJ etc are chosen, what the limits are.
RE46C200 Serial Read - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: June 29, 2021, 02:32:13 pm
content: I'm having lots of difficulty with this (ww1.microchip.com\downloads\en\DeviceDoc\20005285D.pdf). It is certainly possible that is due to hw/sw errors on my part.The bit I'm looking at is Test Mode 1 (TM1), Serial Read/Write. Mostly when I read the chip I get all 1 or all 0. I've tried semi-manually 'pushing the bits', (that is I use the PC to tell the PIC to update an output pin level).I'm using a PC + PIC and level translators (like NXP, AN10441) for communication. I've checked the logic levels I'm creating at the RE46C200 Smoke Detector chip (FEED, IO, TEST2, and TEST), and they are as expected, which is 0 or 9V (the chip is powered at 9V).The serial R/W seems 'like SPI'. Figure 4.3 only shows the write data, and that does not help.Occasionally, 1 time in 10 perhaps, I get what I believe I wrote, which is 0 except for IR current, Integration Time and Gain.On fig 4.3, what happens after the data clock goes low? When should I read data coming out from the chip WRT this clock - and is bit 0 of the "read data from the chip" going to appear before or after the first data clock rising edge?Do I leave the data clock HIGH while I read data from the RE46C200 back into the PIC?
Reaching RMS Current limit for Teknic CPM-SDSK-3446D-ELS motor - Page 1
Forum section: electronics / projects

author: rokspy
author_rank: Contributor
timestamp: November 04, 2022, 11:26:10 am
content: Hello.Has anyone had issues with reaching the RMS Max. limit on the CPM-SDSK-3446D-ELS motors (or on any other ClearPath motor, for that matter), which causes it to turn off?I understand that this is for motor internal protection, but still... I'm looking to step around around it, either with legit or not so legit methods. Perhaps some form of cooling, some hacky code or setting way to disable it, some hardware intrusive method... anything.Let's assume that changing the motor or decreasing the load is not an option.Thanks in the advance!
Reactive air soft targets  - Page 1
Forum section: electronics / projects

author: Joenicholas99
author_rank: Newbie
timestamp: February 14, 2020, 12:57:07 pm
content: Is anyone able to do anything like this?https://youtu.be/uRna2of4YvYAny help or advise would be amazing!!!

author: rrinker
author_rank: Super Contributor
timestamp: February 14, 2020, 05:19:51 pm
content: The video has a link to the page with a full schematic and the code for the Arduino. Pretty much all you have to do is acquire the parts listed and connect them together.

author: Joenicholas99
author_rank: Newbie
timestamp: February 20, 2020, 04:31:04 pm
content: Big thanks
Reactive Source Resonant Transformer - Page 1
Forum section: electronics / projects

author: Thor
author_rank: Contributor
timestamp: April 28, 2024, 02:02:10 pm
content: This aims to make a resonant transformers output dominate in the parasitic Xc and the XL component of the output coils while reducing its ability to pass current in the R component of said coils.

author: johansen
author_rank: Super Contributor
timestamp: April 28, 2024, 08:38:35 pm
content: When electrical engineers develop schizophrenia...

author: Benta
author_rank: Super Contributor
timestamp: April 28, 2024, 09:55:16 pm
content: Well..,"This design posses (sic!) the potential to"... do something. Perhaps provide a therapy for AntiVaxxers? Or QAnon followers?I dunno.
read endurance for flash memory? - Page 1
Forum section: electronics / projects

author: FrankBuss
author_rank: Unknown
timestamp: March 30, 2019, 02:48:10 am
content: I plan to usethisSPI flash memory in combination with a FPGA and execute code from it, reading it with 100 MHz, so I can execute 32 bit RISC-V instructions with about 2 MHz worst case, and more than 10 MHz for consecutive instructions (using the quad read feature, with no cache, maybe even up to 25 MHz with the compressed instruction set). But I can't find a limit how often it can be read, is there a limit? For NAND flash there is an interestingread disturbeffect: If you read one cell too often, it can change the value of neighbor cells. But I guess the SPI flash uses NOR flash, at least this is mentioned in the datasheet a few times. Is this a problem for NOR flash as well, or are there other problems when reading this chip continuously with 100 MHz?

author: FrankBuss
author_rank: Unknown
timestamp: March 30, 2019, 08:48:47 am
content: Found an answer on stackexchange:https://electronics.stackexchange.com/questions/162415/will-reading-serial-flash-memory-wear-it-outSomeone was asking for problems with the SPI flash memory IC SST25VF, which is NOR flash, and the accepted answer says it has read disturb problems. Of course, it doesn't mean that it must be right

author: DC1MC
author_rank: Super Contributor
timestamp: March 30, 2019, 09:10:54 am
content: It isn't the defect is problem for NAND flash, as even the linked article said, but then again everything but the price is a problem for the NAND flash.
- Read the feedback from SBFF and save it to FSX folder - Page 1
Forum section: electronics / projects

author: Nikos A.
author_rank: Regular Contributor
timestamp: July 28, 2022, 10:04:16 am
content: Hi guys,I design a battery based prototype with STM32WLE5JCSoC and I want to include a momentary push button for resetting the MCU.https://www.st.com/en/microcontrollers-microprocessors/stm32wle5jc.html#documentationhttps://eu.mouser.com/ProductDetail/Grayhill/95C06A2T?qs=ls7QRyWmRk5FxCZi6XkIdQ%3D%3DI want to include ESD protection and I am wondering what type of ESD is commonly used for these cases?I read that TVS is used to handle higher power than ESD diodes, so I believe that I have to search for ESD suppressors?https://eu.mouser.com/c/circuit-protection/esd-suppressors-tvs-diodes/?product%20type=ESD%20Suppressors&termination%20style=SMD%2FSMT&instock=yFor example this ESD suppressor would be enough?https://eu.mouser.com/ProductDetail/Toshiba/DF2S5.1FSL3M?qs=lhkzy8lC%252BSu757UTIPjijQ%3D%3DAccording to the datasheet the max input voltage of the input pins is 3.9V. What should be the breakdown and clamping voltage of the diode?
Reading 32bit data from interferometer board - Page 1
Forum section: electronics / projects

author: macona
author_rank: Regular Contributor
timestamp: January 14, 2019, 05:45:05 am
content: So I am trying to do something I have not done before and hoping someone has some ideas to do this somewhat simply. I have a Zygo ZMI-1000A interferometer board, it is VME based but I am hoping not to deal with VME if I can get away with it. The Zygo board can be ran standalone where it outputs the position data on the unused puns of the P2 VME connector. Zygo calls this the P2 bus.The P2 bus is 32bits with a clock and complement, default is a 2MHz update rate. There are some extra IO pins for counter reset, output enable, and errors but thats easy. When the clock goes low the data is available on the bus in 2's Complement format.So what would be a good way to read these boards, I dont need anywhere the 2mhz rate, sampling the bus at 10Hz would probably cover most applications. To be able to dump the data to a PC over serial/usb would be great.So I was thinking maybe something like the teensy 3.5 since it has a ton of 5v compliant IO, I dont think I need DMA access to do this. If I do I could go to the 3.6 which has 32 bits of DMA and just use some voltage translators.Copy of the manual for the board is here:https://drive.google.com/file/d/1BdC5PO9Ez9nzBIuFvZiN9O6MMSnOlnyf/view?usp=sharingThe info needed starts at page 3-5Any ideas?-Jerry

author: new299
author_rank: Regular Contributor
timestamp: January 14, 2019, 02:43:45 pm
content: I don't have any comments on which MCU you should use though something like an STM32 with a USART might be an interesting option?However, the Zygo laser head pictured, and optical receivers look a lot like the HP 5517. I believe a bunch Zygo's interferometer parts are identical to HPs (either they used the same vendor, or HP sold them to Zygo). For the HP 5517, there's a complete open source replacement for what the ZMI-1000A is doing (unless you're using its onboard optical receiver). This project is based around the PIC32, and is by Sam of Sam's lasers and co. I have some notes on the rig I used here:http://41j.com/blog/2017/02/hp-interferometer-notes/Sam uses a board called the ChipKit32. I designed a PCB based on Sam's interface circuit, which is here:http://41j.com/blog/2017/04/umd1-chipkit-32-hp-interferometer-interface/

author: macona
author_rank: Regular Contributor
timestamp: January 14, 2019, 05:04:59 pm
content: The Zygo lasers and parts were made to be drop in replacements for the HP/Agilent systems, thats where the similarity ends. The Zygo lasers have a 20Mhz frequency separation and the board that Sam uses cant handle this. I had already talked to him about it and at this point it is probably more trouble than it's worth to create a system for the Zygos. Plus I have a bunch of these older Zygo boards available which makes it easy.
Reading 4-20ma  - Page 1
Forum section: electronics / projects

author: hubsy
author_rank: Newbie
timestamp: April 03, 2021, 03:19:03 pm
content: I have a project where I need to break into an existing 4-20ma control circuit (24v).I've looked at these,"HW-685 0/4-20mA to 0-3.3/5/10V Voltage Transmitter Signal Converter Module", but as I have found out, these are Non-isolating. The gnd of the current loop is connected to the gnd of the suppling voltage.So I need a board where the current loop is fully isolated from the board supply.Looking through ebay, some adverts say isolation, but looking at the pcb trackside, they appear not to be.Has anyone found a true isolation board?

author: IanJ
author_rank: Unknown
timestamp: April 03, 2021, 05:57:21 pm
content: Hi,Look up Pepperl & Fuchs or Moore Industries.Both of them do signal isolators, converters & interfaces for 4-20mA signals.Ian.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: April 03, 2021, 06:16:37 pm
content: Quote from: IanJ on April 03, 2021, 05:57:21 pmSomething like this:https://www.pepperl-fuchs.com/usa/en/classid_2516.htm?view=productdetails&prodid=9830#overview

author: JamesAus
author_rank: Contributor
timestamp: April 04, 2021, 05:49:57 am
content: One I have used many times is the Datexel DAT511. It's loop powered so no additional supply required.
Reading 5V analog with MCP3001 on Raspberry Pi - Page 1
Forum section: electronics / projects

author: waj334
author_rank: Newbie
timestamp: April 30, 2020, 08:57:48 pm
content: I'm trying read a fluid level sensor that outputs 0V - 5V and decided to go with using a MCP3001 because I saw that I could give it a reference voltage. So I connected Vref pin to the 5V pin of the raspberry pi and the output of the sensor to IN+ pin on the MCP3001. I powered up the Raspberry Pi and noticed it wasn't going to boot. Upon probing the output pins of the MCP3001 I saw that CS was putting out 4.84V or so. Desoldering the chip allows th Pi to boot. Is having Vref and Vdd at different voltages ok for this chip or is the something else wrong with my circuit?

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 30, 2020, 10:53:01 pm
content: I suggest reading the datasheet.And short answer is: Vref should be between 0.25V and VDD. So different from Vdd yes, but higher, no.So with Vref= 5V and Vdd = 3.3V, chances are you'll fry the poor chip.

author: waj334
author_rank: Newbie
timestamp: April 30, 2020, 11:28:56 pm
content: Thanks for the reply!It definitely got fried. My google searches suggest that I need to use a voltage divider. I think a 2.4K and 4.7K resistor should translate it down to a range of 0V to about 3.1V theoretically (according to a calculator). Is there anything I should be considering as far as maximizing accuracy when designing the circuit? I'm not really experienced I must admit, but I'm learning a lot

author: Ian.M
author_rank: Super Contributor
timestamp: April 30, 2020, 11:50:48 pm
content: A 2.4K, 4.7K divider is going to be a significant load on your signal source. If its high impedance you may need a 5V unit gain RRIO OPAMP buffer in front of the divider. Also, the tolerance of the resistors and accuracy of the 3.3V supply voltage directly affect the accuracy of the result.

author: waj334
author_rank: Newbie
timestamp: May 03, 2020, 04:26:49 pm
content: I decided to keep the sensor input and the ADC at 5V because I could get better performance out of the ADC with a higher voltage than 3.3V, so I added a level shifter IC to translate the SPI signals from 5V to 3.3V. I didn't consider noise in my original circuit or that my sensor's cable would become antenna, so I think the addition of the low pass filter was a must have though I have questions about the frequency range. I'm expecting the output of my sensor to behave like a potentiometer where full 5V = tank full and 0V = tank empty. Do I really need 500hz of bandwidth or should my ceiling be lower?

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 03, 2020, 04:33:44 pm
content: I didn't check the details of your schematic, but your approach looks correct to me.As to filtering, I don't know about the specific sensors you're using, but generally speaking, for fluid level sensing, I would go for a much lower frequency. 1Hz to 10Hz should be adequate (or maybe even lower), unless you need to monitor very fast level changes (which I doubt?)
Reading a Russian datasheet - IGV1-16 / GIPS-16 matrix display - Page 1
Forum section: electronics / projects

author: ledtester
author_rank: Super Contributor
timestamp: April 25, 2022, 03:21:45 pm
content: On ebay I see listings for GIPS-16 / IGV1-16 nixie matrix displays such as:https://www.ebay.com/itm/224643685691You can find the datasheets on this page:https://www.spark-tube.com/datasheets/GIPS-16:http://www.spark-tube.com/wp-content/uploads/2018/08/GIPS-16-1-datasheet.jpghttp://www.spark-tube.com/wp-content/uploads/2018/08/GIPS-16-1_1-datasheet.jpghttp://www.spark-tube.com/wp-content/uploads/2018/08/GIPS-16-1_2-datasheet.jpgIGV1-16:http://www.spark-tube.com/wp-content/uploads/2018/08/IVG1-16.5x7-datasheet.jpghttp://www.spark-tube.com/wp-content/uploads/2018/08/IVG1-16.5x7_1-datasheet.jpgI'm wondering how they are supposed to be driven. I can make out the seven anode lines and some cathode lines and it appears some rather high voltages are required but that's about it!One of the main things I'm trying to figure out is how the multiplexing of the 111x7 matrix is organized. Any ideas?

author: terminus
author_rank: Contributor
timestamp: April 25, 2022, 06:16:18 pm
content: Hi ledtester,There are some posts in Russian, you can try it with online translator.https://radiokot.ru/forum/viewtopic.php?f=3&t=3210&p=1671623&hilit=%D0%B3%D0%B8%D0%BF%D1%81#p1671623schematics:https://radiokot.ru/forum/download/file.php?id=150425also useful:http://www.155la3.ru/gazorazryad.htmwbrterminus

author: Gyro
author_rank: Super Contributor
timestamp: April 25, 2022, 06:46:11 pm
content: It looks like a thyratron style display (similar in some ways to a dekatron / counting tube). Where the vertical pixels are fed in at one end, via the 7 anodes and then the glow discharges are physically shifted or persuaded along the display using properly shaped synchronised pulses on the other electrodes. Clever engineering.
Reading AMI 18CV8PC-25 - Page 1
Forum section: electronics / projects

author: yabba235
author_rank: Contributor
timestamp: May 19, 2024, 04:30:06 pm
content: Hi!How read Ami 18CV8-PC chip with modern programer ( usb) ? I find only comercial stuff, for lot of money. Any cheap solution - arduino maybe (dupal don't support peel chips) ? or DIY - any help welcome !!

author: xvr
author_rank: Frequent Contributor
timestamp: May 19, 2024, 05:13:03 pm
content: No way. This is a beast from deep past that should be programmed with special piece of hardware. Manufacturer didn't provide programming specification for it to public.And programming of it requre high voltage (in range 12-24V) and precise timing. So it is not easy to build DIY programmer for it even docs will be found.You can try to restore logic of it by probing input/output (this PLD is a quite small one), but it could be problematic, because it has triggers inside.
Reading back from usb device - Page 1
Forum section: electronics / projects

author: embedded.world@aol.com
author_rank: Contributor
timestamp: April 07, 2014, 04:45:11 pm
content: I have a device which can communicate with PC. When I connect it to PC it forms a vitual com port, it has Silabs IC in it . Then I send 'A' from termianl & it responds back with ack.Now instead of reading it from PC, I want to read it with help of my host microcontroller card.How to do that. I can run UART interface. Should I put another UBS-uart converter in between.But device form virtual com port. If I connect my host controller what should I do initially.
reading circuit board - Page 1
Forum section: electronics / projects

author: jacobsan
author_rank: Newbie
timestamp: July 31, 2012, 04:09:59 am
content: question does anyone have a source in which i can go to find out how to read the abbreviations on this circuit board i have here i have done some searching on google with nothing coming back that helps.

author: David_AVD
author_rank: Super Contributor
timestamp: July 31, 2012, 04:16:56 am
content: What circuit board?

author: Rerouter
author_rank: Super Contributor
timestamp: July 31, 2012, 09:42:45 am
content: also give us some of the abrreviations, they could well be common terms shorterned in weird ways,

author: Randall W. Lott
author_rank: Regular Contributor
timestamp: August 31, 2012, 04:01:01 am
content: These are calledReference Designators.Try this:http://en.wikipedia.org/wiki/Electronic_symbol

author: cs.dk
author_rank: Unknown
timestamp: September 02, 2012, 08:27:35 am
content: Quote from: jacobsan on July 31, 2012, 04:09:59 amI googled it last night, because i couldn't find any logic. I did know C is a cap, R a resistor, but allmost all other were unknown to me.I did find this;http://electronics.stackexchange.com/questions/25308/what-do-the-pcb-markings-mean

author: Randall W. Lott
author_rank: Regular Contributor
timestamp: September 03, 2012, 03:30:20 am
content: If you're still having trouble, you can post a picture of it and I can help.
Reading data from a 256Mbit parallel(?) flash. JTAG? - Page 1
Forum section: electronics / projects

author: oh2ftu
author_rank: Regular Contributor
timestamp: February 27, 2020, 06:27:50 am
content: Hi there.I've got a ST M36L0T806... flash-chip that I would like to read.It's currently installed in a device. I plan to remove it, read it, reball and replace it, do some funky stuff and read it again.Thus far I've been unable to find any documentation of a JTAG-port (only proprietary controllers or pinouts under NDA). Work on this continues, however.Any ideas on how to manually identify necessary JTAG-pins with a scope are also welcome.The flash-device again is a TFBGA88-device. Packaging is not really an issue - one could easily make a batch of breakout-boards. Ready made sockets for UP818 are available on eBay.This is something I'm ready to spend a couple hundred €, but not 1,5k€.Some programmers that I know of;https://microcontrollershop.com/product_info.php?products_id=5172and related. Well, that's it.Is there an affordable way to achieve this?

author: amyk
author_rank: Super Contributor
timestamp: February 27, 2020, 01:21:56 pm
content: This is not a microcontroller, it has no JTAG.From the datasheet it looks like a regular parallel flash. Something like a TL866 should be able to read it.

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 27, 2020, 04:03:46 pm
content: Quote from: amyk on February 27, 2020, 01:21:56 pmI may be tired or stupid, but I couldn't find this reference on the web. Could you provide a link?

author: james_s
author_rank: Super Contributor
timestamp: February 27, 2020, 04:42:31 pm
content: To the TL866? It's probably the most popular device reader/programmer out there by a wide margin.This may not be the best place to buy one, merely the first of many hits.https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F192489415396

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 27, 2020, 04:44:27 pm
content: Quote from: james_s on February 27, 2020, 04:42:31 pmNah. The datasheet of the flash chip!

author: amyk
author_rank: Super Contributor
timestamp: February 28, 2020, 01:24:34 am
content: https://www.datasheetarchive.com/pdf/download.php?id=64a1ea969cf5b8706a17fb0fc168d44acb8b92&type=P&term=8398

author: oh2ftu
author_rank: Regular Contributor
timestamp: February 28, 2020, 09:55:49 am
content: Hi,Thanks for all the replies.To my knowledge the TL866 does not support this chip. If I'm wrong, please do correct me!The idea of using any generic cpu and then boundary-scan the flash is quite neat :-)The preferred solution would be an affordable programmer to read, and possibly write, data to the flash

author: oh2ftu
author_rank: Regular Contributor
timestamp: January 19, 2022, 09:47:10 am
content: I'm resurrecting this also.I've tried reading with an arduino due to no avail.What are my options? it's connected to an AD6528 CPU, but I don't know how to use this approach.Still looking for an affordable programmer and socket - or information on how to use the AD6528 jtag -interface to dump the flash contents..