hybridfree/eevblog-posts huggingface dataset:
Unknown D5, Raspberry Pi 3 B v1.2 - Page 1
Forum section: electronics / general

author: bitman
author_rank: Unknown
timestamp: December 02, 2018, 02:58:06 am
content: Onhttps://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCHE_3b_1p2_reduced.pdfI cannot get the diagram to match what I see on my board. In particular, D5 is labelled to be SMBJ5.0A but the print on the "diode" says BUZ GP711 and I cannot find that anywhere. Testing the component as a diode fails - it has very little resistance (30 or so Ohms).I am no longer able to power the RPI - I think the current got reversed from a "hat" - when I take the PI with nothing plugged into it, it takes about 0.5Amps before it goes to the full 5v and the USB plug and components right around it are very very hot within seconds (burning fingers hot) so there's a short or something like that. Measuring + / - shows 226K\$\Omega\$ - and since I see very little resistance on D5 I'm thinking that's the fault (and I cannot measure the forward voltage). The strange part is, that the component looks exactly like the datasheet for the SMBJ5.0A shows - but the print on it doesn't match (see picture attached).I'm looking to identify the component and find a way to test it to see if it needs replacing.

author: tsman
author_rank: Frequent Contributor
timestamp: December 02, 2018, 03:04:05 am
content: It is a ST SMBJ5.0A as the reduced schematics indicate. The ST datasheet for aSMBJ5.0Asays the marking is BUZ which matches up with what you see on the part. GP is the ST manufacturing location code. 7 is the year. 11 is the week.

author: bitman
author_rank: Unknown
timestamp: December 02, 2018, 03:47:51 am
content: well, I should have known I was reading the wrong datasheet ..... thanks!
Open Source 10Mhz Isolated Distribution Board, TruePosition GPSDO and Enclosure  - Page 1
Forum section: electronics / general

author: RoadRunner
author_rank: Frequent Contributor
timestamp: July 18, 2018, 04:43:22 pm
content: After reading a post on forum. I got few TruePosition GPSDO board for my self. As i am also working on my own GPSDO project. I decided to put these in an enclosure and a 4 or 6 channel Isolated distribution board. all of the source are available in my github account. you are free to use.https://www.circuitvalley.com/2018/07/diy-isolated-10mhz-distribution-amp-gpsdo-rubidium-tcxo-reference.htmlhttps://www.circuitvalley.com/2018/07/gpsdo-10mhz-standard-reference-clock-distribution-trueposition-gps-tcxo-ocxo.html

author: awallin
author_rank: Frequent Contributor
timestamp: November 10, 2018, 07:50:58 am
content: Thanks for posting this! good work.I've listed links to a few different distribution amplifier projects on this ohwr-page:https://www.ohwr.org/projects/pda-8ch-fda-8ch/wiki/similar-projectsI just added the circuitvalley and github links.do you have a measurement of the residual phase noise of the amplifier?

author: Gerhard_dk4xp
author_rank: Frequent Contributor
timestamp: November 10, 2018, 05:58:35 pm
content: Hey, you have forgotten mine :-)<http://www.hoffmann-hochfrequenz.de/downloads/DoubDist.pdf>The phase noise plot includes the GPS receiver/ MTI-260 and the doubler.upto 200 MHz:<http://www.hoffmann-hochfrequenz.de/downloads/iso_amp.pdf>and a 17 dBm version in the photo, which has twice the transistorsfor the larger dissipation required. They don't have a future becausethey use shiploads of BFG31, and there are no RF PNPs anymore.(OK, I still have a reel that's nearly full.)The latter two amplifiers are effectively incarnations of these publications:<https://tf.nist.gov/general/pdf/1200.pdf><https://tf.nist.gov/general/pdf/498.pdf>Cheers,Gerhard

author: awallin
author_rank: Frequent Contributor
timestamp: November 10, 2018, 06:55:06 pm
content: Quote from: Gerhard_dk4xp on November 10, 2018, 05:58:35 pmThanks! added link to the ohwr pageIt's a shame if the transistors aren't available anymore - for as-low-as-possible phase noise I guess one can achieve better performance with a discrete design compared to op-amps.I've looked inside some commercial boxes where they pair two LMH6702s together to get a 3dB reduction.. (a bit like the ADA4898 LNA idea!)
Simple Open source LM399 Reference PCB - Page 1
Forum section: electronics / general

author: RoadRunner
author_rank: Frequent Contributor
timestamp: August 26, 2018, 03:30:46 pm
content: I am doing few experiments with LTC2500 so i needed stable reference voltage, i quickly made this little PCB which some may find interesting. It is open source , Schematic, Gerber and PCB files are available in my github account.https://www.circuitvalley.com/2018/08/diy-open-source-lm399-voltage-reference-10v-dmm-calibrate.html

author: Jon.C
author_rank: Unknown
timestamp: August 28, 2018, 05:24:25 am
content: interestingwhat can be the price of the assembled kit?or the kit with all the components for mountingDo you have any for sale?

author: bitseeker
author_rank: Super Contributor
timestamp: August 28, 2018, 05:27:12 am
content: Neat. Thanks for sharing the project, RR.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: August 28, 2018, 03:10:00 pm
content: Quote from: Jon.C on August 28, 2018, 05:24:25 amYes there are few assembled calibrated boards available.I don't want to make it sale thread. I would post in buy sell section if more people are intrested.

author: Sprock
author_rank: Contributor
timestamp: September 21, 2018, 12:35:34 pm
content: Hello all,this is my first post so not sure if this is the right place.Attached my data logging and temperature of RoadRunner LM399 board.Thank you RoadRunnerWolfgang

author: RoadRunner
author_rank: Frequent Contributor
timestamp: October 10, 2018, 11:40:25 am
content: Quote from: Jon.C on October 09, 2018, 10:12:27 pmBang on
Wireless GPIB adapter based on the ESP32 - Page 1
Forum section: electronics / general

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: July 07, 2018, 04:24:17 pm
content: I have put together a quick project for using the ESP32 as an wireless GPIB adapter.I tested the ESP32 with a modified variant of Jason Pepas Arduino GPIB Library:https://github.com/pepaslabs/atmega-gpibAnd it seems to work just fine. For my first tests I used just level shifters to connect the 3.3V logic of the ESP32 with the GPIB hardware, but for the final project I put in the proper SN75ALS160 drivers.The Altium design files as well as Gerber / schematic PDF can be found here:https://github.com/sixtemesseven/WGPIBI put in some obvious mistakes lets,see if you can find themSuggestions are welcome as well!Also please tell me if you would like the addition of a DC-Plug or some headers and a converter for e.g. a lipo pack. The PCB will get bigger thought...

author: rhb
author_rank: Super Contributor
timestamp: July 17, 2018, 01:06:42 am
content: I'm quite interested in this, but at the moment am snowed under by just physically organizing things. At present I have 8 GPIB instruments I want to connect to and I expect that number to grow.

author: LapTop006
author_rank: Unknown
timestamp: August 29, 2018, 06:05:48 am
content: Oh neat, I was considering doing something similar, although not ESP based.Looks like you can take power from a USB connector, that's certainly easiest for me these days, and if I have at least one modern-ish piece of kit on the bus I'm unlikely to need a supply. I'd happily buy a few.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 30, 2018, 12:38:29 am
content: Take power from usb with an isolated dc-dc converter and a dc jack ... in case of insufficient usb power
SaveYourInternet Article 11 and Article 13 - Page 1
Forum section: electronics / general

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: September 15, 2018, 11:26:11 am
content: What is this all about then:I saw this on on one of PCBReflux's latest videosPCBRefluxhttps://www.eff.org/deeplinks/2018/09/why-whole-world-should-be-arms-about-eus-looming-internet-catastrophehttps://www.theverge.com/2018/9/12/17849868/eu-internet-copyright-reform-article-11-13-approved

author: sokoloff
author_rank: Super Contributor
timestamp: September 15, 2018, 12:29:43 pm
content: It’s a ridiculously terrible decision by the EU, but I also think that people who are afraid of their own shadow will be prone to over react to it. A manufacturer wants its datasheets to be accessible and linked (in general). Being afraid to link to a mainstream manufacturer’s openly released spec and datasheets is an over-reaction, IMO.I think the bigger impact is going to be some smaller, niche sites closing themselves off from EU users. If I ran a discussion board, I’d have to carefully weigh the risk vs benefit of allowing EU access. For one of my hobbies (private aviation), I’d absolutely block Europe. (Already a very small market due to other anti-aviation policies, and no way the market/audience is worth the hassle/risk in that case.)

author: perieanuo
author_rank: Frequent Contributor
timestamp: September 15, 2018, 01:17:18 pm
content: Quote from: Quarlo Klobrigney on September 15, 2018, 11:26:11 amLike the monks and religious people in middle ages, the knowledge don't belong to people, but it's their property.F... them, we'll continue to share,in fact that was my believe from 20 years of electronics,I always shared my experience.F..ing stupid people with insensed rules.I want world to be free to travel and work,but UE it's just the new French-Deutch empire.Envoyé de mon iPad en utilisant Tapatalk
Open Source DIY 53131A 53132A Ultra High Stability Oven Option 012 and 010 OCXO - Page 1
Forum section: electronics / general

author: RoadRunner
author_rank: Frequent Contributor
timestamp: July 26, 2018, 12:17:20 am
content: I was looking to buy OCXO oven for my 53132A but only found evilbay stuff.Without any data and unknown source of components i was not very confidant to buy them.I looked around for high quality build when found nothing I looked for any open source design.But as it turn out there was no open source design available , so i decided to make one completely opensource. here is how it looks.https://www.circuitvalley.com/2018/07/agilent-53132a-53131a-ocxo-ultra-high-stability-oven-time-base-upgrade-option-open-source.html

author: bitseeker
author_rank: Super Contributor
timestamp: July 26, 2018, 05:03:10 am
content: Cool. Thanks for making it open source.I remember seeing a related project. Let me see. Yes, this is a DIY one using the Isotemp OCXO131-191.https://www.eevblog.com/forum/testgear/diy-low-cost-hpagilent-53131132181-timebase/I don't yet have one of these counters, but always good to be ready when the time comes.
PanelDuino-2x8 - Mini Arduino Smart Display - Page 1
Forum section: electronics / general

author: emrelabs
author_rank: Newbie
timestamp: June 02, 2018, 11:25:10 am
content: Hi everyone,I just release new Arduino Board. It is an open source project. Suitable for small monitoring and control application.Hardware:https://github.com/emrelabs/Emrelabs-PanelDuino-2x8-HardwareSoftware:https://github.com/emrelabs/Emrelabs-PanelDuino-2x8Board Specification-Open Source Hardware-Provided Arduino Library and example-Embedded Arduino Pro Mini Board (5V – 16MHz)-Embedded CH340G USB-Serial converter (USB Connector)-2×8 Character LCD (on I2C bus)-5 pcs user button (on I2C bus)-LCD and all buttons use only 2 pcs pin (I2C pins)-1 pcs user Led (D13)-1 pcs power indicator led-Optional external power input: 8 – 18Volt-ICSP port-Panel mount design-4 pcs screw holes for easy installation-Compact design (Dimensions: 90mm x 45mm)DetailsA4 and A5 pins are used as I2C (for LCD and buttons). This pins only used as I2C. Also 0x20-0x21 addresses reserved. (Buttons: 0x20 – LCD:0x21)Pictures attached.I hope you like itThank you.

author: asokolsky
author_rank: Newbie
timestamp: June 26, 2018, 06:50:20 pm
content: I like it!I like OSH, choice of CPU, CH340G and use of i2c to save pins and pin headers for connecting peripherals.I was searching for Arduino with integrated display and input for a while.The following would make such a product impossible to resist for me:- bit display, say 1.3" 128x64 OLED. To be used mostly for text (328 not suitable for graphics) but offers flexibility in choosing font size.- compact but feature-rich keyboard. I am impartial to joystick with two extra buttons on a side. Here is my shot at it:https://easyeda.com/asokolsky/I2C_Keypad-524d125bedb34150b7cb3deea4f5bff9https://github.com/asokolsky/i2cNavigationKeyPadhttps://raw.githubusercontent.com/asokolsky/i2cNavigationKeyPad/master/doc/IMG_6622.jpgGood luck promoting your PanelDuino and cheers!Alex

author: cowasaki
author_rank: Frequent Contributor
timestamp: June 26, 2018, 11:24:06 pm
content: Quote from: emrelabs on June 02, 2018, 11:25:10 amI have a box of those tiny 8x2 LCDs they are very cheap but also very small! 2x16, 4x16 or 4x20 would make it far more flexible as would offering it with a socket for the LCD to be attached.
3-phase TR rectifier I/O controller design - Page 1
Forum section: electronics / general

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: May 29, 2018, 01:24:43 am
content: Hi there,I have been back to high power design.My system contains 3phase, 380V, 50Hz ac input, secondary surge protector, Aux Tr ( single phase, 380V/220V, 300VA), phase transformer( 3ph, 380v/12v,0v,12v,100VA) and a main transformer ( 3ph, 380V/9V,18V,800VA),SCR(1600V, 50A) bridge, DC reactor( DC 20V,20A). Rectifier output should be DC 20V 20A.My requested EVM should be,1. PTR secondary windings phase, amplitude and rating controller.2. MTRs secondary fuse (690V, 32 A) sensing3. SCRs switching controller.4. 50mlV, 30A shunt sensing,5. GPS communication,6. RSM7. LAN8. Display....etc,Kindly recommend me one.You can also transfer this post to suitable forum.RegardsHasan
Contributing code to open source SW while retaining a different license... - Page 1
Forum section: electronics / general

author: westfw
author_rank: Super Contributor
timestamp: May 19, 2018, 07:27:47 am
content: Suppose that I write some code (a small but significant subroutine) that I am willing to contribute to existing OSSW project using, say, GPL.But suppose I'm not that fond of GPL myself, and want to make sure I retain the right to also distribute this code in MIT/BSD/etc OSSW, or in my own proprietary SW, without some OSSW-troll (like patent trolls, theoretically) being able to come along later and say "I found this identifiable segment of code in your binary - you are clearly using GPL'ed software without meeting the requirements of the GPL licenses ah hah!"What are my options?I suppose that there similar situations that might come up in OSHW, although "contributions" tend to be less common in HW.

author: ataradov
author_rank: Super Contributor
timestamp: May 19, 2018, 07:46:35 am
content: If you own the copyright in a first place, then you are free to dual-license it at any point. Even if troll shows up, all you need to do is point out your name on the GPL piece of code.This gets a bit questionable if project requires singing a CLA and does not identify contributors by name in the files.

author: jancumps
author_rank: Unknown
timestamp: May 19, 2018, 07:53:03 am
content: if you keep the contribution separate and don’t ask the project to include it, you can do anything that’s alowed by their original license.if you want your code/patch to be included in their codebase, you’ll have to convince them to also accept that license. If you submit a first patch with a different license - because you don’t like their choice -you will most likely be seen as someone who doesn’t work along nicely. My guess is that they will ask questions, you will reply that they made a bulshit shoice because [argument 1, argument 2] and that they should have made a better choice to begin with. The conversation becomes heated. You all end up as enimies. The patch is not accepted ...That’s my prediction

author: ataradov
author_rank: Super Contributor
timestamp: May 19, 2018, 07:58:00 am
content: The question is not about pushing your license on existing project.You can have the same piece of code have two or more licenses. That's perfectly normal and happens at times.

author: jancumps
author_rank: Unknown
timestamp: May 19, 2018, 07:59:21 am
content: Quote from: ataradov on May 19, 2018, 07:58:00 amyes, true.
Creative Commons Equivalent to Provisional Patent Application? - Page 1
Forum section: electronics / general

author: standardengr
author_rank: Newbie
timestamp: May 15, 2018, 03:02:23 pm
content: Hello all,I have an invention (I have an idea but I'm also able to explain and create diagrams on how it will work) but I need help from another engineer/physicist. I was briefly reading on how to get an invention protected if you don't have all the details ironed out and need assistance from someone else. I read that you should file a provisional patent application and then have anyone helping you sign a confidentiality agreement so they don't run off with your invention. Is there a creative commons equivalent to be protected in this situation?Thank you all for your help.
megadesk - IKEA Bekant Controller - Page 1
Forum section: electronics / general

author: joeyjoejoe
author_rank: Frequent Contributor
timestamp: May 12, 2018, 01:48:24 pm
content: There's a few tidbits about this around the internet, and a few of those posts are on EEVBlog as well.I've created a custom controller for the IKEA Bekant motorized standing desk. It adds memory functionality, with (practically) unlimited memory options.https://github.com/gcormier/megadeskThe PCB fits in the original enclosure and uses the original hardware where possible, so it's not very intrusive and can be easily reversed. The hardest part of the project was reverse-engineering the startup handshake to the motors. Without that, the motors would not respond to any commands.I hope some of you find it useful! The only hardware improvement I would potentially look into is a DC Buck for the power, but the price is a bit high to pull that off. The source DC can hit 37V, so filtering IC's that can source 40V and turn it into 12V reveals some expensive IC's in low quantity. That, and the additional components - I don't think it's worth it.
Vector Mapping GPS, MP3 Player, & More (dsPic) - Page 1
Forum section: electronics / general

author: @rt
author_rank: Super Contributor
timestamp: May 04, 2018, 07:26:33 am
content: HiHere’s the software release for 20 months of MP3 Player, Vector Mapping GPS, Talking Astronomy Clock, Tetrabrick Game, and Dynamic Calendar.GUI has fluid animated transitions from one screen to another, and file browser lists titles from ID3 tags (for MP3) or map title descriptions.The MP3 Player can display JPEG cover art in greyscale by cycling through four bitplanes.As far as I’m aware, this is still the world’s only proper vector mapping GPS done from scratch by a lone hobbyist.The demo programs are not supposed to be understood by others, they break any and all rules for space,but the underlying 2d graphics library for KS0108 GLCD is intended to be recyclable.https://sourceforge.net/projects/freedom-platform/PS. This is a software distribution. No PCB CAD yet, but a prototype is on it’s way to Mexico right now toa fellow who appears to be proficient with Altium. I’ve also built two of these under camera on my YT channel,and those two units are functional, so YT instruction is verified. I’d be happy for anyone to also give the PCB CAD a go.Cheers, Brek.Video:
interfacing with a commonly available cheap 2-channel PWM PCB module (no name) - Page 1
Forum section: electronics / general

author: n3rdx
author_rank: Contributor
timestamp: April 15, 2018, 01:12:34 pm
content: Hello all. I recently purchased an Ebay common item (too many variants of the same product) which is pictured below (from the Ebay posting) and has a silk screen part number HW-1015. I have however seen many other websites/product listings of the same product in order to use the serial commands shown in the posting. I am trying to interface with it using the "serial" interface, with no luck. Does anyone have any tips/experience with what type / level of serial interface to use? The MCU is reported to be stm8s003k3, but I haven't verified it.What kind of USB/serial interface do you recommend I use?eBay auction: #https://www.ebay.com/itm/2CH-Independent-PWM-Generator-Duty-Cycle-Pulse-Frequency-Module-LED-Digital-Tube/112150422354?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649http://www.icstation.com/channel-pulse-adjustable-frequency-square-wave-digital-display-signal-generator-module-stepper-motor-controller-p-10535.htmlThe module does work, sort of. Frequency specs are good for approximate use only.
i Need help in designing PIC16f877a based development board  - Page 1
Forum section: electronics / general

author: samdare
author_rank: Contributor
timestamp: March 30, 2018, 02:51:02 pm
content: hey there, i need a schematic for designing development board PCB for PIC16f877a using following stuff in circuit.-PIC controller -atmega8a burner-9 leds-9 push buttons-motor driver L293D-2 small buzzer-2 seven segment-1LCD-2ADC pin-1main circuit switch on off circuit-1 AC jack-+9v dc-1LED FOR CIRCUIT on off status indication-1 7805 Voltage regulator- USB connector with driver-as comfortable male female pinssomebody help me with schematic ,rest all i can .Is there some open HARDWARE project out with more or less similar things.

author: Simon
author_rank: Unknown
timestamp: March 30, 2018, 05:16:17 pm
content: You mean you want someone else to do all the work for you, is this homework? Please don't double post, it causes confusion and annoys people.
New Pick and Place Machine - Page 1
Forum section: electronics / general

author: kerim_kaleli
author_rank: Newbie
timestamp: March 03, 2018, 10:19:56 am
content: Hi everyone,My name is Kerim, I am an indie developer from istanbul Turkey, generally I work on mechanics and electronics.About a year ago decided to design and manufacture a pick and place machine, because the machines are either expensive or does not have vision.. the project is completely open source, all files are not open yet but I will upload them day by day.You can visit atopenplacer.comfor details and support us atindiegogo.com/projects/open-placer. I will be grateful for your comments.Thank You AllKerim

author: kerim_kaleli
author_rank: Newbie
timestamp: March 15, 2018, 08:32:58 am
content: dear All,I uploaded nozzle run out test videos to our website, also we are planning to sell the machines also as a kit. we will be grateful for your commentsThank You AllKerim
Bunnie Huang keynote speech at Linux conf in Au?/Paper Circuits - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: February 04, 2018, 01:59:53 pm
content: I'd like to see this speech which I understand was pretty good.Edit: Found it!Increasing open-source inclusivity with paper circuitswhole schedule:https://rego.linux.conf.au/schedule/main/So, this is a whole environment for teaching basic computer science to people in a non-intimidating way.Links:http://get.chibitronics.com/ltc-vol1.pdfhttps://github.com/chibitronics

author: hermit
author_rank: Frequent Contributor
timestamp: February 04, 2018, 05:41:38 pm
content: My understanding is they will show up here when available. I see a few are up now.https://fosdem.org/2018/schedule/events/

author: cdev
author_rank: Super Contributor
timestamp: February 04, 2018, 06:55:33 pm
content: Thank you, some real gems there!But I wanted to see the Australia conference, see above, I found a link.Quote from: hermit on February 04, 2018, 05:41:38 pm

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: February 05, 2018, 09:04:55 am
content: Quote from: cdev on February 04, 2018, 01:59:53 pmI think your google-Fu became confused by name overloading. Chibi is the Japanese word for littleboyif I recall correctly. Other than using similar names chibitronics has nothing to do with chibios ( a very good real time embedded OS). I might be wrong, in which case you can upbraid me here.edit: google translate gives chibi=little

author: hermit
author_rank: Frequent Contributor
timestamp: February 05, 2018, 03:50:00 pm
content: Quote from: chickenHeadKnob on February 05, 2018, 09:04:55 amI think in the video he said it meant 'small and cute'. Considering part of the thrust of the video was to get more girls interested that would have been a strange name if it was what you suggest it is.https://en.wikipedia.org/wiki/Chibi_(term)
Building the OpenTheremin V3 - Page 1
Forum section: electronics / general

author: madsbarnkob
author_rank: Frequent Contributor
timestamp: January 10, 2018, 10:12:44 pm
content: I received a bare board and some of the SMD components for a OpenThereminV3, it is a semi-assembled kit that can be bought from Gaudi (http://www.gaudi.ch/OpenTheremin/index.php?option=com_content&view=article&id=180&Itemid=115). The board I got was from a previous unsoldered kit where you have to buy all the components yourself. This totalled to another 35€ in parts as I do not have much SMD components in stock.It is made as a shield that mounts directly on a Arduino Uno, which also makes the programmering very easy. Plug in USB, download source code from github, download the source to the controller and start playing on your new theremin!The whole building process is very easy from just looking at the parts list and the schematic when you are in doubt, the silk screen layout is almost good enough to just use that along with parts list to solder it up correctly.I made a video of the soldering and building process with a bit of testing it at the endHere is some more detailed photos of the enclosure, antennas and boards inside. Starting with the Open Theremin V3 board where it is all soldered up and I am fairly satisfied with the result as I just used my regular soldering iron used for DIP components and a very thin solder.The Arduino Uno board mounts directly on top of it and fits nicely inside of the enclosure.I used 4 different colour knobs for the potentiometers so it was easier to remember which is volume, pitch, register and timbre, as I did not have anything in mind to use as a front with texts on.

author: madsbarnkob
author_rank: Frequent Contributor
timestamp: January 10, 2018, 10:16:32 pm
content: Second post for more picturesThe antennas is all done by hand and bend around a wine bottle, easily done and the result is absolutely perfect!I did a quick test setup where it was just connected to a tube amplifier I have in my lab, in the future I will try to modify it for MIDI output which there is a separate guide on (http://www.gaudi.ch/OpenTheremin/index.php?option=com_content&view=article&id=200&Itemid=121)

author: kalel
author_rank: Frequent Contributor
timestamp: January 12, 2018, 01:45:44 am
content: These things are interesting. Although it's not easy to be sure when a "good one" is made since it takes so much time to learn to play the instrument. Your build seems to sound like it can be used properly with practice.
Open Source Automated Screen Printing - Page 1
Forum section: electronics / general

author: Thewafflication
author_rank: Contributor
timestamp: December 28, 2017, 04:33:02 am
content: I am a student pursuing an Associates of Science in Electrical and Computer Engineering Technology. I am entering my final term, and will take a course similar to a university's senior design course.Goal:I want to build a device that can silk screen laminate copper boards, with very little user intervention. The device will be created using open source tools. The device will be released under TAPR_OHLv1.https://www.tapr.org/TAPR_Open_Hardware_License_v1.0.txtRequirements:So far the only requirement I know of is that I need to use the TI Launchpad MSP432 somewhere the project.The class hasn't started yet. It starts Jan 8th.Current Work:I will be drawing the machine in FreeCad.Captain’s Log:12/28/2017 11:00pm I've created a github repo for the project. That can be found here:https://github.com/Thewafflication/Silk-Screen-Printing-MachineI have also created a breadboard adapter for the MSP432 Launchpad. I have ordered boards to test from OSH park. There is also a repo for that adapter here:https://github.com/Thewafflication/TI-MSP432-Launchpad-Breakout-to-Breadboard-Adapter12/27/2017 10:00pm I've "built" my first silk screen frame. I was very disappointed with the results. I blame my failure on my lack of wood working skills. To mitigate some of the issues, I have modeled a couple tooling. (See the attachment) The tool in the attachment allows me to drill two pilot holes in perpendicular 1x2's at a 60 degree angle. The other tool lines up my drill bit, to put in countersinks. To fix my last problem, I need to develop a method to consistently cut the same length and square. I was using a jigsaw, but figured out a skill saw would be much more appropriate.
Dave 2 3dPrinter Project - Page 1
Forum section: electronics / general

author: tpowell1830
author_rank: Frequent Contributor
timestamp: November 24, 2017, 02:13:03 am
content: I remember seeing on YT on EEVBlog where Dave 2 (or David as he prefers) built a prototype class 3d printer that was open source. He built this as part of his university thesis, but was thinking of selling them as open source machines, maybe as a crowd funded project? I searched through all of the EEVBlog videos to see where he actually demonstrated this printer and could not find it. Does anyone remember if they have seen this, I would like to get the link and see this printer in action.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: November 24, 2017, 12:05:31 pm
content: Hi Dave, I saw this video, however he (David) said that he would show the unit actually working with more information in a later video. This does not show the unit working.Edit: Clarified that this would be in later video.

author: EEVblog
author_rank: Unknown
timestamp: November 24, 2017, 12:18:05 pm
content: Quote from: tpowell1830 on November 24, 2017, 12:05:31 pmAh, ok, don't think we ever got around to that.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: November 24, 2017, 12:43:04 pm
content: Thanks, maybe it will show up soon. I check your YT channels (both) fairly often, I will watch for it. Did he ever start trying to sell them?

author: frozenfrogz
author_rank: Frequent Contributor
timestamp: December 09, 2017, 12:12:43 am
content: I’d also love to see more about this!
Contact temperature sensor DS18B20 - Page 1
Forum section: electronics / general

author: yamadanao614
author_rank: Newbie
timestamp: July 24, 2017, 08:28:09 am
content: I need a contact temperature sensor to get the temperature of a container. How aboutds18b20?Anything like LM35 which I found from google search gives me ambient temperatures. Can anyone suggest an easy to use contact temperature sensor? Accuracy as high as possible! I am going to use it with an Arduino Due, if that information is relevant.

author: hermit
author_rank: Frequent Contributor
timestamp: July 24, 2017, 03:24:02 pm
content: Either work. There is already ample support for the DS18B20 in Arduino if I'm not mistaken. Contact is more about what you put the chip in and how it is mounted. I used to have a round flat disk for measuring such things. It's all about the contact area.

author: BradC
author_rank: Super Contributor
timestamp: July 24, 2017, 03:54:43 pm
content: Quote from: yamadanao614 on July 24, 2017, 08:28:09 amAccuracy or resolution?

author: perieanuo
author_rank: Frequent Contributor
timestamp: July 26, 2017, 12:52:10 pm
content: Temp range?I used lm35 and 18b20 with arduino nano and mega and other some proprietary control box,all worked fine.18b20 limit is 115 deg I think.for upper temp (needed 470deg)I used max31855 with k thermocouple you can reuse later the project and big advantage you find tc with screw fix or penetration so temp acquisition is perfect.As for 16b20 or lm35 like,just do a hole put some thermal paste silicone type and isolate accordingly the pins with retractable.If you want pro use tc or ptc (max31865 I guess).it's simple like 18b20.regards,PierreEnvoyé de mon iPad en utilisant Tapatalk

author: zeqing
author_rank: Regular Contributor
timestamp: August 07, 2017, 06:45:06 am
content: i prefer the DS18B20, there is some package waterproof, which really suit for real applications.there are many sensors with much higher accuracy, but as you will used with arduino, the 18B20 is enough. do not forget some thermal paste silicone to make the 18b20 contacts to the item you want to measure.

author: galtdw
author_rank: Newbie
timestamp: December 01, 2017, 04:23:03 pm
content: DS18B20 absolute accuracy is too low, the stability is poor. I suggest you use PT100 platinum resistance sensor, at present I have achieved its high-precision acquisition. Temperature fluctuations of less than 0.01 ?
Host_client usb header load switching - Page 1
Forum section: electronics / general

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 01, 2017, 12:38:21 am
content: lets free it

author: krho
author_rank: Regular Contributor
timestamp: December 01, 2017, 05:37:33 am
content: slg4r4918v is probably a custom chip fromwww.silego.com

author: krho
author_rank: Regular Contributor
timestamp: December 02, 2017, 02:20:49 pm
content: I don't know how it functions. The customer of the chip has built the logic using their UI and then they built them.
BCM54220B0KFBG  datasheet - Page 1
Forum section: electronics / general

author: MHT2017
author_rank: Newbie
timestamp: October 22, 2017, 09:48:17 am
content: Hi guys,Does anyone know how i can find the datasheet for BCM54220B0KFBG from broadcom. it is a ethernet PHY ic in SABRE reference design of NXPSiNA

author: fourtytwo42
author_rank: Super Contributor
timestamp: November 04, 2017, 10:48:21 am
content: No chance unless your an OEM and sign multiple contracts, I have never known a company as bad as Broadcom for making it very difficult to get data, I try to avoid using them wherever possible for that reason alone.
Understanding the circuit action  - Page 1
Forum section: electronics / general

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: September 20, 2017, 05:40:25 am
content: Hello Sir,I am getting trouble in the switching problem on my device power OFF action.Take a look this circuit and help me.V_BAT_OUT is 3.52 volt, VIN is nearly 4 volt.The schematics says,When this circuit gets power from battery V_BAT_OUT1. PWR_KEY is High,2. firmware check PWR_IND signal3. PWR_KEY is pressed on few moments4. MCU_RST pin will be LOW, that PWR_HOLD as HIGH.but when, VIN is in action1. PWR_KEY is LOW,2. firmware check the PWR_IND signal3. PWR_KEY is release on few moments4. MCU_RST pin will be high, that PWR_HOLD as LOW.In VIN action mode, in maximum temperature, the base of DTC304 giving Higher voltage!!Can you describe the circuit well,Why the diode acts strange is high temperature?How the 3 network in base of DTC304 is performing ?Do you suggest any simulation, how could we control these MCU signal on it?

author: tec5c
author_rank: Frequent Contributor
timestamp: September 23, 2017, 01:22:22 pm
content: When you say "high/maximum temperature", what range do you mean?

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: September 23, 2017, 01:40:27 pm
content: Thank you to respond in this flow.This circuit has been tested at room temperature and for checking the performance it has taken 60 degree C that is Maximum temperature. I think diodes are reacting for leakage current and something happend for current source that raises voltage against resistors.
Awesome Coffee Server - ESP8266 based IoT webserver - Page 1
Forum section: electronics / general

author: frozenfrogz
author_rank: Frequent Contributor
timestamp: August 04, 2017, 11:07:06 am
content: Sorry guys, I screwed up. Don’t ask me why, but after opening a thread on this in the "Projects, Design..." board I remembered the OSHW section and thought it would be better suited here. However, I thought the original thread was removed (but that somehow failed and I did not notice) and then I intentionally created the same thread here. Now there are both threads present :/I contacted a mod to sort it out, since I myself can not do anything about it right now.Please do not respond to this thread, but head over to the "projects" board instead.Thank you!

author: zeqing
author_rank: Regular Contributor
timestamp: August 05, 2017, 03:19:24 am
content: for your question, i have used many relaies, all without a optocoupler. i believe it is safe enough especially when you make it in a PCBA.

author: zeqing
author_rank: Regular Contributor
timestamp: August 05, 2017, 03:30:59 am
content: besides, how you will program the ESP module. an nodemcu or nodemcu mini would be help...

author: Simon
author_rank: Unknown
timestamp: August 06, 2017, 10:43:24 am
content: See here:https://www.eevblog.com/forum/oshw/awesome-coffee-server-esp8266-based-webserver/
Audio Analyzer Suite Help. - Page 1
Forum section: electronics / general

author: Oneminde
author_rank: Regular Contributor
timestamp: June 04, 2017, 09:55:49 pm
content: Thestuffmade webpage is down and I really need a copy of the Audio Analyzer Suite, can anyone please share it ?Oneminde

author: DuPe
author_rank: Regular Contributor
timestamp: August 04, 2017, 09:18:28 am
content: If it is just matter of the webpage gone down: Have you tried Wayback Machine?https://web.archive.org/

author: Oneminde
author_rank: Regular Contributor
timestamp: August 04, 2017, 11:06:13 am
content: Yes, and the other issue is that even if I - now - have the .exe, when installing, the software pings thestuffmade to download material. So I am stopped in my tracks of installing.
NFC tags (Type 4 - Read/Write Capabilities) with Bluetooth Capability - Page 1
Forum section: electronics / general

author: beeboopbeep
author_rank: Contributor
timestamp: July 24, 2017, 03:33:43 pm
content: Hi everyone,I had a simple idea about making tiny modules with NFC antenna embedded onto the PCBs and these modules would have nRF52832 from Nordic Semiconductor which has Bluetooth capability. Nordic Semiconductor announced some months ago that the nRF52832 now have both read/write capability (Type 4 NFC) instead of just read capability (Type 2 NFC) so I thought you could do some interesting stuff with them. For example, you can set up a booth where you need to check the presence of people coming in or out of an area and they can check in/out using their phones. Previously, with read-only NFC tags, you would need a phone with internet access on the app that connects to your server to check in/out or the NFC touch would only be verified from the user end. But now, you don't need internet access and you can code a much simpler app that sends text strings to the NFC tag via contact with no internet required for verification. I'm also thinking these can be used for entertainment purposes (i.e., treasure/egg hunt type of sort that have been done before with NFC tags in the past but now with the wireless capability added).I would compile an Arduino library for basic wireless functionalities such as choosing which centralized Bluetooth controller to connect to by ID. Also, the Arduino would of course support all peripheral functionalities (e.g., UART, I2C, etc.) and allow the user to program what kind of actions to take depending on the messages these tags receive from NFC enabled devices. So, the entire package would consist of one centralized controller (that would either connect to your PC via serial to USB or some other system that will use the serial data to do some tasks) and at least one NFC tag with the Bluetooth capability.I guess the main question is, are NFC tags with wireless (Bluetooth) capability useful enough for both development and commercial use?Any feedback would be greatly appreciated.Thank you!
Good Prefab Electronic Toy for Learning C+? - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: May 12, 2017, 04:02:20 pm
content: So long, and thanks for all the fish.

author: eugenenine
author_rank: Frequent Contributor
timestamp: May 12, 2017, 08:35:04 pm
content: Why not arduino, its basically C

author: BBBbbb
author_rank: Unknown
timestamp: May 12, 2017, 11:24:38 pm
content: If C/Cpp is your main focus than why not just programming projects?If you don't want to stray from the hardware side go for some ARM MCU, there are some nice dev boards out there, use something like Keil (32kb size limit enough to play with) and fiddle with registers and stuff, not relying on plug and play libraries as you probably did with Arduino.Not sure how you consider just an Arduino inferior to a robot for learning C. Complexity of projects with Arduino is totally upon youself.I see a robot as an advantage only if you want to experiment with more advanced control algorithms (e.g. nonlinear control ...) but C has very little to do there.

author: hendorog
author_rank: Super Contributor
timestamp: May 12, 2017, 11:55:19 pm
content: Quote from: BBBbbb on May 12, 2017, 11:24:38 pmI assume the OP wants something more interesting to get started with than just a bare arduino board.Check these kits out:https://www.pololu.com/category/2/robot-kitsAnd these controllers come with built in motor drivers for small motors so are easy to get started with:https://www.pololu.com/product/1302

author: cdev
author_rank: Super Contributor
timestamp: May 14, 2017, 10:58:25 pm
content: OpenCV running on a RaspberryPi is a pretty interesting swiss army knife of a tool for doing machine vision stuff that has hooks to C++ and Python and ...You can use the RPIs GPIOs and SPI and i2c to talk to hardware of all kinds. Its extremely popular so there are literally TONS of ready to go projects out there with code - Just use a real (external USB) hard drive for compiles so you dont thrash the flash disk. You need to install build-essential for compilers.

author: kjh83
author_rank: Contributor
timestamp: June 13, 2017, 01:40:52 pm
content: This seems to check all your boxes except for being a kit, but it does have a link to all the parts:The video camera setup is optional.
PandwaRF RF Analysis Tool - Page 1
Forum section: electronics / general

author: tania-b
author_rank: Newbie
timestamp: June 01, 2017, 10:53:42 am
content: Hi,Just wanted to share a device you might find interesting. PandwaRF is a portable RF analysis tool with a Sub 1GHz RF transceiver, BLE & USB. You can find more information here:https://pandwarf.com/.On the website you can also find a comparison with similar devices like RTL-SDR and Yard Stick One:https://pandwarf.com/news/yard-stick-one-vs-rtl-sdr-vs-pandwarf/, and several demos, including one showing how to disarm an alarm with PandwaRF using brute force:https://pandwarf.com/news/disarming-an-alarm-using-brute-force/.Any feedback is more than welcome

author: biot
author_rank: Regular Contributor
timestamp: June 01, 2017, 01:31:39 pm
content: While it seems very interesting, and I may not be able to resist getting one, this really isn't open source at all. Both the hardware (aside from a schematic) and firmware are closed.I would suggest posting this in theRF, Microwave, HAM Radiosection of the forum.

author: Tartopom
author_rank: Newbie
timestamp: June 01, 2017, 01:44:30 pm
content: It is open hardware, the schematics are in the documentation page.
USB audio chip  - Page 1
Forum section: electronics / general

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: May 31, 2017, 12:34:14 am
content: Hello Everyone,Could you kindly recommend me a low price "USB audio chip"?Any circuit and firmware is appreciable.RegardsHasan

author: P90
author_rank: Frequent Contributor
timestamp: June 03, 2017, 01:14:54 am
content: oops never mind, I misread...

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: June 04, 2017, 01:24:32 pm
content: Dear Sir blueskull,Thank you for such information.I need a cheap USB ic which can work with a PDM microphone.Need a CODEC usb support where Headset is for microphone output. The microphone we gonna use is MEMs one.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: June 05, 2017, 04:24:54 am
content: Dear Sir Blueskull,Looking at your idea, does CM6500 can applicable for single bit PDM mems microphone ?Take a look this datasheet in attachment.
Anyone will attend at the 2017 Open Source Hardware Summit? - Page 1
Forum section: electronics / general

author: ansonbao
author_rank: Regular Contributor
timestamp: May 15, 2017, 09:57:43 am
content: The 2017 Open Hardware Summit is the annual gathering of the OSHWA organization and open hardware community. The 2017 Summit will be held in Denver, Colorado on October 5th at City Hall.Will you attend at the Summit?
Interested in FPGAs or hardware and in Uni? Get paid to hack on FOSS! - Page 1
Forum section: electronics / general

author: mithro
author_rank: Newbie
timestamp: March 19, 2017, 07:31:45 am
content: Are you a Uni student who is interested hardware, FPGAs or embedded programming? You could get paid to hack on them byapplying to the TimVideos.us organisationforGoogle Summer of Code!--The deadline for applications is April 3 16:00 UTC, so you should start now!Not a student? You can help us by share this post!As Dave recently retweeted, the TimVideos.us project ishappy to announce that it is participating in Google Summer of Code 2017 (GSoC2017)and is looking for students to hack on the hardware used to record many open source conferences - including Linux.conf.au, many PyCons around the world and DebConf.Due to the focus on hardware, we are looking for students who areinterested in things like FPGAs, VHDL/Verilog and other HDLs, embedded C programming & operating systems, and electronic circuit/PCB design!This year we have joint project ideas with other hardware based groups who are also participating in GSoC2017 including;The apertus project-https://summerofcode.withgoogle.com/organizations/4801281785856000/lowRISC-https://summerofcode.withgoogle.com/organizations/5710050115977216/The FOSSi foundation-https://summerofcode.withgoogle.com/organizations/5867002221559808/Some of the interesting projects that TimVideos.us is looking for students to contribute too are;Porting a real operating systemsuch as Linuxor NuttXto our System On Chip to allow easier development of new features (https://github.com/timvideos/getting-started/issues/33).Porting MicroPython to our FPGA SoCto allow both hardware and firmware be developed in Python together!Improving simulation of our SoC using QEmu(In collaboration with lowRISC)Improving the debug interface for the soft-CPU cores in our SoC(In collaboration with apertus)Creation of an open source 4K HDMI output HDL Gearwork Logic / IP CoreMaking use of theEthernet interface for connecting multiple devices togetherand alternative capture interfaces.and many, many more.Looking forward to seeing what this year's batch of GSoC students create!
"Micro RC" - an Arduino based 2.4GHz and IR remote control system - Page 1
Forum section: electronics / general

author: TheDIYGuy999
author_rank: Newbie
timestamp: January 24, 2017, 06:54:58 pm
content: Hi everyoneThis is my first post here. I would like to show you a project, on which I've worked on for the last couple of months.It's basically a miniature 2.4GHz and infrared remote control system for vehicles. The main features are:- 4 analog axes- OLED display- NRF24L01+ 2.4 GHz radio- configuration menu- Infrared transmitter for LEGO Power Functions and MECCANO- 4 Servo connectors- integrated TB6612FNG DC motor driver- boards from OSH park- CNC milled housingsEverything is documented on GitHub:https://github.com/TheDIYGuy999?tab=repositoriesThe transmitter manual is available in English and German:https://github.com/TheDIYGuy999/RC_TransmitterA lot of "Micro RC" videos can be found on my YouTube channel:https://www.youtube.com/channel/UCqWO3PNCSjHmYiACDMLr23w