hybridfree/eevblog-posts huggingface dataset:
Hantek PC USB Oscilloscope 6022BE Questions - Page 1
Forum section: electronics / projects

author: beauty2003tt
author_rank: Contributor
timestamp: January 28, 2016, 07:29:29 am
content: I have a Hantek 6022BE which works as described but there are 2 changes Irecommend to improve the software.1. Currently one trace is yellow. Is there any method to change thecolours of the individual traces? When I print the screen, the yellowtrace is almost invisible.2. As shown by the file attached to this email, the other competitors in thedigital oscilloscope industry have an extra function that enables theoperator to select the display position of the triggering point.As quoted in the enclosed file ' Marker shows the trigger position. Thisalso indicates the horizontal position since the Horizontal Positioncontrol actually moves the trigger position horizontally.'All the other features are available with the software but the ability toset the position on the screen to the trigger point as selected by theoperator is a definite advantage which the software lacks.Page 31 of the Hantek manual states 'If The oscilloscope wants to acquire awaveform, it collects enough data so that it can draw the waveform to theleft of the trigger point.Therefore, it seems to me that the only aspect lacking from including thisfeature in the software is the selection of the position of the triggerpoint by the operator.

author: daybyter
author_rank: Frequent Contributor
timestamp: January 28, 2016, 03:39:49 pm
content: You click on the marker on the right side and move it up or down?
Hard Drive Running on Brushless ESC - Page 1
Forum section: electronics / projects

author: sonnytiger
author_rank: Frequent Contributor
timestamp: January 15, 2014, 12:09:39 pm
content: Kind of a fun little experiment, similar to videos I've seen with people running alternators as motors (which I tried with no success), it works for the most part, but has trouble starting.Thanks for watching!
Hard to find info. - Page 1
Forum section: electronics / projects

author: CHexclaim
author_rank: Regular Contributor
timestamp: April 21, 2015, 11:21:20 am
content: I recently posted on the Repair section a topic asking for help to find datasheet or information on a Lambda Power Hybrid Regulator. More specifically the Part No: FBH-24-024.But my question now goes more into a general question. I sometimes have trouble finding any information on certain parts or products; in this case, I couldn't even find a source where information for this module is sold, not just available. Having to purchase information for certain parts or products is not uncommon.Maybe I don't have the knowledge on where to search. For example, some time ago I posted a topic asking for help on information on an old electronic VOM. Before posting I spent some time on the web searching, with no results. But, after less than two hours of having posted the topic for help, I had received several answers from several very kind people with the required information.Sometimes I start to think that manufacturers make the information unavailable on purpose, but I cannot understand why. If I were to replace the part in a repair, I would most probably replace it with a similar part from the same brand if the information is available, and if it is a good part, I would consider using their parts in new designs. Now, not having information on the products is a very important issue to take into account when selecting parts for new designs.I am a bit frustrated because I am starting to think I will need to build a separate hardware to replace the functionality of the assembly where this part is used.Anyhow, comments are welcomed as usual and thank you all.CH.
Hard-wired current sensors for large inductive loads?  (i.e. pool pump) - Page 1
Forum section: electronics / projects

author: sofakng
author_rank: Regular Contributor
timestamp: June 01, 2020, 03:12:45 pm
content: I'd like to build a device that can control and monitor my pool pump's energy consumption. Devices like the Sonoff POW (and other "smart outlets/switches") don't work with inductive loads like pumps.Basically I'd like to connect a microcontroller (esp8266, etc) to a contactor to switch my pump on/off, but then I want to monitor the current as well. I could use current clamps but I'm hoping for something hard-wired.

author: floobydust
author_rank: Super Contributor
timestamp: June 02, 2020, 01:03:30 am
content: From theSonoff POW schematicit uses an ESP8266 and 10A relay and HLW8012 energy metering IC with 1mohm 2512 current-sense resistor. The IC seems to calculate active power and should work with inductive loads as it's not a dumb power meter that ignores power factor. What leads you to believe it doesn't work with inductive loads?A centrifugal pump draws pretty much constant power, assuming it's not sucking air or the valves closed so I would not expect much interesting from trending power consumption.

author: PaulAm
author_rank: Frequent Contributor
timestamp: June 02, 2020, 01:42:01 am
content: Use a current transformer on one of the supply leads. The output may need a little conditioning but then just run it to an ADC pin on the processor.
Hardware compatibility - Page 1
Forum section: electronics / projects

author: clmoi90
author_rank: Newbie
timestamp: December 05, 2013, 07:23:53 am
content: Dear,I am studying in INHA University for the Master degree. For my thesis, I am working on the linearization of defined software radio (mainly to linearize harmonics and intermodulation produced by IQ modulator). I need to buy some stuff for the test bench and I have some Hardware questions.The test bench will be composed of:- A FPGA DE2 altera (http://www.altera.com/education/univ/materials/boards/de2/unv-de2-board.html) to run the algorithm and produce the input signal.- A modulator DAC5682zEVM (http://www.ti.com/tool/dac5682zevm) or DAC34H84EVM (http://www.ti.com/tool/dac34h84evm) to upconvert my input signal.The signal produced by the FPGA will be upconverted by the modulator then I need to analyze the output signal. I cannot get a spectrum analyzer. So I want to transfer the signal on my computer to analyze it with a software. What do you think about using an ADC to transfer the output signal from the modulator to the FPGA and then from the FPGA to my computer?What are the characteristics I have to check when I choose an ADC?Do you think the ADS1118EVM (http://www.ti.com/tool/ADS1118EVM) is appropriate to link a DAC5682zEVM (or other) and a FPGA (as the DE2 of Altera). Moreover, this ADS1118EVM has an USB port; does it mean that I will be able to get the output directly on the computer without feedback the DAC5682zEVM into the FPGA?Thank you in advance for your help.Best regards,Ludovic

author: marshallh
author_rank: Unknown
timestamp: December 05, 2013, 07:33:09 am
content: For minimal time wasted you'll want to grab an eval board from TI (formerly national division) or Analog Devices.They are typically a combo of a general purpose high-end FPGA board and a vendor-supplied eval board for the data converter along with sample set ups.Expect to pay $1k-4k. Now if you want to build it yourself, you have much more reading and building to do.Now, if you want to jump specifically to SDR analysis, consider getting something built for that:In order of decreasing price:1. Ettus USRP2. Ettus B200/B3003. nuand bladerf4. HackRFThe complexity of your design will depend on how much bandwidth you need and what max freq to work with

author: marshallh
author_rank: Unknown
timestamp: December 05, 2013, 07:35:56 am
content: That converter board you linked is built for thermocouples at 860 samples per second.If you don't know where to start, start with a 100msps 12/14bit ADC and 250/500msps 10/12bit DAC. That should cover most everything you'd want to do. You are going to have your work cut out for you trying to build a system around those.
Hardware Interlock Using MAX6369 - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: August 01, 2015, 03:39:34 pm
content: I have some hardware which needs to be interlocked to software such that when there's no watchdog input pulse the hardware circuits become disabled. The MAX6369 has adjustable watchdog times and the 13-30s range is appropriate for the timing.What I need to do is when WDO goes low for 100mS indicating the detection of lost pulses for 13-30 seconds I have to latch this. The output latch needs to stay low until no WDO pulses are received for over 30 seconds in which case then the output latch could then again go high enabling the hardware circuits.What is the recommended way of going about this? I was also thinking of just using a window comparator with a cap for pulse detection or maybe a missing pulse detector 555 circuit but these seem to require more external components.I was thinking of a flip flop on the output of the watchdog but because I only have one pulse for data in I'd need a clock signal that lags slightly behind when the WDO output gets set low.Any ideas?
Hardware Time Delay Reset Activation? - Page 1
Forum section: electronics / projects

author: SaccharinGoat
author_rank: Newbie
timestamp: October 11, 2022, 04:41:53 pm
content: Hello, all. First time posting.I am designing a project that involves a raspberry pi and a microcontroller, when the microcontroller starts up it might pull some pins high or low for a brief moment. I want to be able to use the reset pin on the raspi to restart it after it has been shut down but I do not want the pi to be unexpectedly shutdown and the filesystem corrupted.I want to design a circuit so that when the input has been active for a second or two it activates the output and triggers the reset pin. Optimally this is made from transistors for low BOM cost.I have looked at using 555 circuits and watchdog timer ICs but they are both too expensive for my taste on Digikey.The most promising option seems to be an RC timer hooked up to some Darlington transistors, but the rise time is not fast enough for me (>50ms @350ms delay and scales with increased delay)Anyone have any advice?

author: Terry Bites
author_rank: Super Contributor
timestamp: October 11, 2022, 05:57:13 pm
content: Remind me not to go for a beer with you.You might look at single gates in SC-74A-5 eg 74LVC1G14GX 18cents!

author: SaccharinGoat
author_rank: Newbie
timestamp: October 11, 2022, 06:17:41 pm
content: Man, its gonna be tough soldering that X2SON5 package but I think this is the best solution. I looked at schmitt trigger inverters/buffers but only on Digikey. Mouser has them in stock so I guess I am splitting between the two now.Thank you for your help, I greatly appreciate it!
Harmonic Distortion filters - Page 1
Forum section: electronics / projects

author: Lambros
author_rank: Newbie
timestamp: March 12, 2013, 05:31:46 pm
content: Hey,I wanna try and eliminate the harmonic distortion from a ATX PSU, I'm thinking about adding filters but I don't even know where to start.Or, something like a buffer that eliminates any noise and just takes the dc level and outputs it. Something like between a dc amp buffer.Any thoughts, suggestions...?

author: Icarus
author_rank: Regular Contributor
timestamp: March 12, 2013, 08:19:20 pm
content: Do you mean that you want to correct power factor for a ATX PSU ?

author: cyr
author_rank: Frequent Contributor
timestamp: March 12, 2013, 08:51:49 pm
content: Or filter the output ripple?The term "harmonic distortion" can't really be applied DC though...

author: ballanux
author_rank: Contributor
timestamp: March 12, 2013, 09:05:03 pm
content: Usually ATX power supplies already have PFC which will greatly reduce the THD. But that only affects the mains power, so maybe you are referring to the output ripple as cyr suggested...
Harmonics: CS5463 vs CS54xx - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: March 05, 2020, 12:40:41 pm
content: The only CS54xx datasheet mentioning harmonic measurement is the CS5463. I'm surprised just one chip in the series can measure/'deal with' harmonics(?).

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 05, 2020, 03:15:25 pm
content: What do you mean? THD figures?Is there anything more than THD figures in the CS5463 datasheet (haven't read ALL of it)?I opened the DS for the CS5464, and it also gives THD figures. Is there anything more you were expecting, and that is present in the CS5463 datasheet (and that I missed)?

author: 741
author_rank: Frequent Contributor
timestamp: March 05, 2020, 03:30:18 pm
content: The CS5463 has explicit harmonic registers eg "Harmonic Active Power Register"

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 05, 2020, 04:57:18 pm
content: Didn't get that was what you were talking about. (That required reading details of the DS.)Well, I don't know how we can answer your question really, just ask Cirrus?That said, other parts of the line do measure apparent, active, reactive power, the power factor... that looks adequate for many uses in power supply monitors to me, so I'm not too surprised that the additional harmonic measurements are not available on all models.What's your application and what would you use a specific harmonic active power measurement for?

author: ogden
author_rank: Super Contributor
timestamp: March 05, 2020, 05:35:38 pm
content: Quote from: 741 on March 05, 2020, 12:40:41 pmYes. CS54xx is much more than just ADC. There's "power calculation engine" inside, most likely CPU core running some code.

author: 741
author_rank: Frequent Contributor
timestamp: March 06, 2020, 10:23:40 am
content: Measuring EV charging power: The 'Zoe' (and some other EV) have what seems to be significant harmonics. See alsohttps://www.eevblog.com/forum/chat/electronic-energy-meters-give-readings-up-to-582-higher-than-actual-energy-co/

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 06, 2020, 03:04:05 pm
content: Ok I see. Well, there you have at least one reference for that. As I said above, the applications are probably still not enough to justify including this measurement into ALL models of power monitor ICs.Given the typical cost of a EV charger, I'd also bet that implementing this with a separate ADC + CPU would not make much of a difference in the end, except a few more hours of design work. It's not hard stuff.So yes, this IC is convenient, but having that all integrated beyond convenience would make more sense for lower cost devices - for which I don't quite see the point of harmonic measurements quite yet. Just a thought.
Harmonized Tariff Schedule (HTS) number for a development board? - Page 1
Forum section: electronics / projects

author: globoy
author_rank: Frequent Contributor
timestamp: November 04, 2022, 04:10:46 am
content: Does anyone have experience importing development boards and know what number(s) to use (in my case China->USA)? Specifically a board with an ESP32 and Silicon Labs micro-controller as well as a small LCD display (a PCB assembly).I've been through chapters 84 and 85 as well as searching online and it seems that people claim different numbers for things like Arduinos. I think a good fit might be 8473.30.11.80 referring back to 8471 since 8473 refers to parts and 8471 refers to complete machines. I noticed Intel used this number with their (now obsolete) Edison board.

author: jonpaul
author_rank: Super Contributor
timestamp: November 04, 2022, 06:43:04 am
content: vendor is responsible to fill out custom forms, ask vendorj

author: Someone
author_rank: Super Contributor
timestamp: November 04, 2022, 06:51:36 am
content: Quote from: jonpaul on November 04, 2022, 06:43:04 amCross border shipping is the trigger for this, like say selling second hand, seller/vendor might not care about international sales due to this sort of extra work. Some delivery services actively hide this information from the recipient just to make it that little bit more annoying (cant even refer to the original package).When I want a quick answer, look up a same/similar part on Digikey. They have the HS code right there in the data.

author: globoy
author_rank: Frequent Contributor
timestamp: November 04, 2022, 03:14:16 pm
content: Thanks for that idea. I found an Espressif dev board that Digi-Key listed as 8471.50.0150 which also makes sense.
HART protocol specs and implementation - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: December 24, 2019, 08:11:21 am
content: Hi,I was searching on the subject, though they say it's an open protocol, I could not find any PDF or documents explaining it all! am I missing something? till now I just found that we have modem chips for that like AD5700, But I want a reference design, the sample code, ( I prefer Cortex M) and the specs of this protocol.Do you have any Idea?

author: viperidae
author_rank: Frequent Contributor
timestamp: December 26, 2019, 02:24:44 am
content: Does this help?https://www.scribd.com/document/357644096/HCF-SPEC-12-6-0-pdf
Has anyone actually build Dave's LCR meter? - Page 1
Forum section: electronics / projects

author: Lost resistor
author_rank: Contributor
timestamp: October 17, 2020, 08:43:51 am
content: I came across this video where Dave explains how LCR meter work. But are there any schematic based on what principle? If not, what is a good way to build such LCR meter?Video link:

author: coromonadalix
author_rank: Super Contributor
timestamp: October 17, 2020, 11:41:55 am
content: You mean a dds based lcr meter ? the dds section providing precise signals tests ?BK Precision 885 or 886 has this functioning principle, schematics at ko4bb websiteOthers brand can or could be based the same way ... but schematics are hard to findDave explains principles of theses "Tests cylinders".And the board you see "Master and slave board" are to test sismic cables and equipment in a automated wayThe price for theses muste be very high.Now you have fully integrated ic's used in a DE-5000 (2 ic's design, check the teardown of them) who does a great job, at a good precisionused in:Uni-tMatsechDEER DE-5000

author: coromonadalix
author_rank: Super Contributor
timestamp: October 17, 2020, 11:59:09 am
content: Something like this ? attached file

author: Lost resistor
author_rank: Contributor
timestamp: October 17, 2020, 01:56:13 pm
content: What i wanted to ask was, is there a DIY LCR meter based on what you can see on the image. I dont know anything about it, i just saw the video and thought it was interesting.

author: ledtester
author_rank: Super Contributor
timestamp: October 17, 2020, 04:58:34 pm
content: There are a bunch of LCR meter designs which use a computer's sound card, e.g.:http://www.rcl-meter.strobbe.org/You could also use an Analog Discovery.If you want to build one, the XJW01 has gotten good reviews. You can source a kit from aliexpress/ebay and there is a forum thread on it complete with schematic:https://www.eevblog.com/forum/testgear/xjw01-auto-lcr-meter-review-($120-bench-top-lcr-meter)/

author: cdev
author_rank: Super Contributor
timestamp: October 17, 2020, 11:24:22 pm
content: Look at the design for the AVR Transistor Tester, its discussed in one of the biggest and oldest threads on this site.One of the things it does is test L, C, and R. Its an incredibly innovative use of just a few parts. Its measurements are quite good for what it is. It uses n AVR microcontroller.Quote from: Pavle123 on October 17, 2020, 08:43:51 am
has anyone asked the mafia how to deal with ground planes? - Page 1
Forum section: electronics / projects

author: sarepairman2
author_rank: Frequent Contributor
timestamp: August 15, 2015, 05:18:02 pm
content: they have alot of experience dealing with merging and unifying different territories and doing ground work..

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 16, 2015, 07:12:17 am
content: Ever heard of PCBs with passives (chip R/Cs) embedded in them?I heard they buried Jimmy Hoffa that way.Tim

author: Len
author_rank: Frequent Contributor
timestamp: August 16, 2015, 01:47:39 pm
content: I fell behind on my cable bill and one night the set-top box caught fire.

author: GreyWoolfe
author_rank: Unknown
timestamp: August 16, 2015, 07:43:17 pm
content: Quote from: Len on August 16, 2015, 01:47:39 pmAt least your knees are still intact.
Has anyone bought this book on LTSPICE IV - Page 1
Forum section: electronics / projects

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 07, 2014, 01:36:49 pm
content: I came across this book,http://www.we-online.com/web/en/electronic_components/produkte_pb/fachbuecher/Trilogie_1.phpHas anyone got it, read it or know of any reviews on it? Wondering if its worth buying.ThanksTrev

author: Rufus
author_rank: Super Contributor
timestamp: November 07, 2014, 02:20:50 pm
content: Quote from: trevwhite on November 07, 2014, 01:36:49 pmA wurth rep showed me a copy, was hoping for a freebie but had to settle for a few LEDs and inductors - lol.The author is supposed to be an expert and wurth sponsored him or something to write the book, 660 pages is a lot of information. LTSpice isn't well documented so if you use it a lot and like things made out of trees I expect it is worth the money.

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 07, 2014, 02:29:23 pm
content: Yeah, same happened to me but they did not even show me a copy. I just got a flyer and I hinted a bit but no book. Just some leds...I think if it is really useful and simulation does have a place to help with design work its worth the investment. So much time can be wasted in fumbling around trying to learn stuff. I could book can really help.

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 07, 2014, 02:42:15 pm
content: Well found a decent price for it online so bought it. Sure it will save me a lot of time and teach me a few things

author: Neilm
author_rank: Super Contributor
timestamp: November 07, 2014, 05:48:27 pm
content: I did get a copy from a Wurth rep. I haven't had the time to read it properly but I have looked up a couple of things in it and it answered the questions I needed.

author: jay
author_rank: Regular Contributor
timestamp: November 08, 2014, 06:51:52 pm
content: Quote from: trevwhite on November 07, 2014, 01:36:49 pmFrom that web page:QuoteWow, according to them LTSpice is more popular than Facebook

author: DutchGert
author_rank: Frequent Contributor
timestamp: November 08, 2014, 08:13:48 pm
content: Quote from: trevwhite on November 07, 2014, 01:36:49 pmI have it, very nice book to use as course material or just as a reference.

author: miguelvp
author_rank: Super Contributor
timestamp: November 08, 2014, 11:28:05 pm
content: Quote from: jay on November 08, 2014, 06:51:52 pm3 out of every 13 people used LTSpice in 2011? nice

author: TheNewLab
author_rank: Frequent Contributor
timestamp: November 20, 2014, 07:35:16 am
content: I don't know how in-depth you are looking for re: LT Spice. However I remember Afrotechmod has a great introductory 3 part YouTube on LT Spice.Here's the link to part 3. ( This may too basic, I enjoyed it though)

author: eetech00
author_rank: Regular Contributor
timestamp: November 20, 2014, 07:18:46 pm
content: hiI have the book and, well, I felt like I was reading a printed copy of the Help file. :-|It's written more as a reference book for an advanced user than for a beginner.JMOeT
Has anyone come across a good multi-channel DAC shield for Arduino - Page 1
Forum section: electronics / projects

author: SharpEars
author_rank: Unknown
timestamp: October 19, 2017, 09:10:57 pm
content: Preferably one that is at least 16-bit and has 4 or more channels. This is not for audio, so it doesn't have to be particularly fast, just precise/accurate given a good voltage reference and have already written software for it (on github, for example).

author: MasterT
author_rank: Frequent Contributor
timestamp: October 19, 2017, 11:44:31 pm
content: Second line on google search:http://store.digilentinc.com/analog-shield-high-performance-add-on-board-for-the-arduino-uno/

author: SharpEars
author_rank: Unknown
timestamp: October 20, 2017, 07:00:44 pm
content: Quote from: MasterT on October 19, 2017, 11:44:31 pmPretty expensive and only 16-bit, although it is at least 4-channel. I was hoping for something 18-bit or higher and with 4 or 8 channels (no need for an ADC).

author: MasterT
author_rank: Frequent Contributor
timestamp: October 20, 2017, 09:24:26 pm
content: I agree, it costly, DAC IC itself $21-24 CAD on digikey. And for 8 channels my search shows on first line another DAC AD5676 $25.44 -CAD.There is AD1934, may be an option, though it seems audio, and likely to have 12-bits resolution for DC, or even less.Recently I was experimenting with MCP4922, cheap 12-bits, actually 8.5- if not count 12 LSB for integral non-linearity. Adding 3 digital pots (8-bits) I was able to get 18+ (measured ENOB 15) with help of arduino and LUT in software. $5-6 hardware, one channel. Demultiplexing output to 8-16 channel by 4067 or 4051 would not be too complicated.
has anyone disassembled a 9v (PP3) lithium primary battery? - Page 1
Forum section: electronics / projects

author: robert.rozee
author_rank: Frequent Contributor
timestamp: October 25, 2023, 01:12:26 pm
content: hi,a quick question - has anyone here ever disassembled a 9v (PP3)lithiumprimarybattery? like the "energizer ultimate" that are marketed for use in smoke alarms and the likes where a multi-year lifespan is then possible.i'm interested in finding out if they use 3x cylindrical 3v cells, or a stack of CR2450, or 6x AAAA. a photo would be great if anyone has one. i've scoured the web, but found few signs of intelligence.cheers,rob :-)

author: oPossum
author_rank: Super Contributor
timestamp: October 25, 2023, 02:20:39 pm
content: 9V lithium batteryPicture from @tubetime.bsky.socialhttps://bsky.app/profile/tubetime.bsky.social/post/3kamoz3j5hd2b
Has anyone else purchased a display with ESP32, with a yellow board, for LVGL? - Page 1
Forum section: electronics / projects

author: rtek1000
author_rank: Contributor
timestamp: June 26, 2025, 11:21:48 pm
content: Hello,On my board (2.4 inch), pin 5 of the touchscreen is connected incorrectly to GND.I would like to know if other versions have the same problem.https://www.displaysmodule.com/sale-40776756-esp32-2432s024c-capacitive-touch-ips-display-module-supports-wifi-and-bluetooth.html
has anyone found a apa102 2020 eda footprint yet?  - Page 1
Forum section: electronics / projects

author: firehopper
author_rank: Frequent Contributor
timestamp: August 22, 2018, 01:34:57 pm
content: I have yet to find one that works with diptrace or any software, maybe my googlefu is weak. anyway. If you have one please share. thanks

author: Buriedcode
author_rank: Super Contributor
timestamp: August 23, 2018, 02:38:39 am
content: Have you tried making one yourself? If you don't know how, it could be a good excuse to try. I know that's not what you asked, but if it only takes 10-15 minutes, then why not

author: firehopper
author_rank: Frequent Contributor
timestamp: August 23, 2018, 07:47:26 am
content: I dont think I have the skills to actually make one that would be able to be made into a pcb later.
Has anyone hacked the new UR servo Protocol from Futaba as they did SBUS? - Page 1
Forum section: electronics / projects

author: DigitalDeath
author_rank: Regular Contributor
timestamp: June 16, 2025, 09:57:07 am
content: I'm curious to learn what's it about from a hack-level point of view i.e. serial protocol, formats. packets, etc.John.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 16, 2025, 10:01:41 am
content: better luck on rctech and rcgroup forums ?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: June 16, 2025, 10:50:25 am
content: My own preference is to simply not buy stuff and then have to reverse engineer it. There are some brands of "robot servo's" that work on a serial / daisy chained / RS485 bus and that have the specifications of the complete protocol available. I'd rather give my money to that company.I don't do much with servo's, Once bought a few of the very cheap transparent yellow plastic ones. Quality is so bad they went almost straight into the bin. Bought a bit better servo, but I found the 1.5ms to 2.5ms protocol abysmal. I.e. you start by trowing away 90% of the resolution by not using the rest of that pulse width. These servo's are apparently usable for some remote control applications, but not very useful to me.Last servo I bought worked on some serial data protocol. It was a no-name servo, probably works with SBus, but when I discovered that was just a 10 bit position signal I was a bit disappointed.Edit: Oops, I'm mixing up different things here. sorry.Then I opened the thing and there was a small STM32 in it. That is something I'm willing to invest some time in. It still was a relatively cheap servo with a potentiometer. One step up and then the servo's have a HALL sensor for the position feedback. Add a brushless motor, and then you have a system that is nearly wear free.In the upcoming weeks I'm probably going to toy a bit with a 750W servo. Input can be -10V to +10V, modbus, and a few other protocols (no EtherCAT yet) and it comes with 100 or so pages of documentation and half of that is for the communication protocol.

author: oPossum
author_rank: Super Contributor
timestamp: June 16, 2025, 12:43:56 pm
content: What specific servo models?The older fast response servos just used a higher frequency PWM.
Has anyone here used an MC12080? - Page 1
Forum section: electronics / projects

author: GK
author_rank: Super Contributor
timestamp: October 21, 2016, 09:36:56 am
content: http://www.onsemi.com/pub_link/Collateral/MC12080-D.PDFLooking to use one 100 MHz up. Input signal amplitude limits are neglected in Absolute Limits, but the Electrical Characteristics and attendant input sensitivity graph suggest a maximum signal level of 1Vpp. Below 250 MHz the suggested window is 400mVpp - 1Vpp. Pretty crappy having to remain inside such a narrow window. If anyone has applied this part does it go whoopie if the input signal level is substantially above 1Vpp? Alternatively does anyone know of a wideband MMIC amplifier (0.1-1GHz) or similar that clips/limits reliably at ~ +4dBm?Additionally is there a DC bias to the signal output? Level? Being ECL I presume so.

author: MagicSmoker
author_rank: Super Contributor
timestamp: October 21, 2016, 10:16:20 am
content: This is not really my area of expertise, but I would check out Mini-Circuits:http://www.minicircuits.com/products/Amplifiers.shtml

author: PA0PBZ
author_rank: Super Contributor
timestamp: October 21, 2016, 10:32:18 am
content: Antiparallel scottky diodes at the front?I don't understand the part anyway, inputs to set the division ratio but then an Rl dependent on the ratio....

author: GK
author_rank: Super Contributor
timestamp: October 22, 2016, 02:57:17 am
content: Think I'll just try a long-tail pair limiting amplifier based on a couple of BFP460 or similar.

author: G0HZU
author_rank: Super Contributor
timestamp: October 22, 2016, 10:52:04 pm
content: It's a long time since I've used discrete prescalers like this but usually the reason they try and make you drive the chip with a narrower window at LF is to keep up the slew rate as smaller sinewave signals at LF have slower edge rate across a certain voltage window. This can cause issues with clocking and produce very poor phase noise. One workaround is to simply limit it as you have already considered and this keeps the level below a set limit but it also helps with slew rate (and therefore can avoid some odd phase noise degradation effects at LF due to slow edge rate) On some parts you can go way below the minimum frequency if you square up and limit the drive level.
Has anyone overclocked attiy85 at 16Mhz below 5V - Page 1
Forum section: electronics / projects

author: buck converter
author_rank: Regular Contributor
timestamp: July 06, 2017, 12:49:49 am
content: I need something with hardware SPI and 16MHz. The attiny85 has internal 16Mhz, but that officially only works at 5V. My project is powered by a 1S lipo. Has anyone successfully overclocked the attiny?

author: Unknown
author_rank: Unknown
timestamp: July 06, 2017, 01:04:09 am
content: buck converter, perhaps you could use a boost converter?...Sorry, I have nothing useful to add, but you have to admit you left yourself open for that one.

author: DaJMasta
author_rank: Super Contributor
timestamp: July 06, 2017, 01:07:36 am
content: I haven't tried personally, but especially if this is for a one off project... you could just try and see.From the ATTiny85 datasheet, you can get some that are binned for 20MHz at 4.5-5.5V, so even though it's probably out of spec, 16MHz at 3.7V should be manageable. It would be easy to test with some kind of stress test that displays a known output, then just hook up the battery and see when it starts acting up. Since it's probably not an officially supported speed, you probably can't count on that performance for a larger run of whatever you're making, but there are plenty of micros that can do that on <3.7V and there's always the option of a boost converter - not going to be expensive even if you have to buy a prebuilt module.

author: Sceadwian
author_rank: Unknown
timestamp: July 06, 2017, 01:08:06 am
content: I don't see why it wouldn't work, other 5V parts I've used will turn on maybe somewhere around 4V? and I think off at 2.7 but that's only off the top of my head. Keep on mind the RC clock is dependent on VCC so you might have clock issues, like maybe not stable. I don't think it'd be reliable on a single lithium cell, but you can always try.

author: buck converter
author_rank: Regular Contributor
timestamp: July 06, 2017, 01:16:30 am
content: Thanks for the advice!

author: Fungus
author_rank: Super Contributor
timestamp: July 06, 2017, 02:46:48 am
content: Quote from: buck converter on July 06, 2017, 12:49:49 amNot true.I shouldn't imagine you'll have any problems, you're just about in spec and those things are quite tolerant.Remember the spec covers temperature extremes so there's some wiggle room at normal temperatures.nb. The oscillator is factory calibrated using 3V.
Has anyone seen this IC - Page 1
Forum section: electronics / projects

author: prodarkness
author_rank: Contributor
timestamp: May 19, 2017, 03:01:45 am
content: recently came across this IC but cant really find the datasheet. please help to identify thank you.

author: amspire
author_rank: Super Contributor
timestamp: May 19, 2017, 03:11:58 am
content: A ST Microelectronics SMCJ22CA 22V transient suppressor

author: prodarkness
author_rank: Contributor
timestamp: May 19, 2017, 03:44:36 am
content: how you find it @amspire ? Thanks btw !! cheers

author: slurry
author_rank: Regular Contributor
timestamp: May 19, 2017, 05:40:08 am
content: All SMD's should have a specific marking code, it is BEX in this case, google "SMD code BEX" and this diode will show up.You will also find the code in datasheets, for example MMBF170 (transistor) has K6Z.This marking systems works quite good but unfortunately there is a few exceptions.

author: amspire
author_rank: Super Contributor
timestamp: May 19, 2017, 06:23:04 am
content: Quote from: prodarkness on May 19, 2017, 03:44:36 amIt looked like it may be a bidirectional transient suppressor from the size and packaging and it was made by ST. With the BEX code, it was not hard to fine.ST put the SMD code on their Transient Voltage Suppressor guide in the 1500W section.http://search.alkon.net/cgi-bin/pdf.pl?pdfname=01973.pdf
Has anyone used MM5290 dynamic RAMs? - Page 1
Forum section: electronics / projects

author: gcewing
author_rank: Regular Contributor
timestamp: August 15, 2020, 06:44:47 am
content: I'm working on a project to make use of some parts in my junk box, among them some MM5290 16kx1 dynamic RAMs.This chip appears to be more or less identical to the TMS4116, except for one thing. The data sheet for the 4116 warns against applying +5V or +12V power without the -5V power being present, or the chip may be damaged.But the datasheet for the 5290 contains no such warning. Does this mean the 5290 is immune to this problem? It would make things a lot simpler if I didn't have to worry about it.Is there anyone out there with experience of using these chips who can comment?For the curious:https://hackaday.io/project/158777-bredsac

author: amyk
author_rank: Super Contributor
timestamp: August 16, 2020, 12:16:23 am
content: Datasheet says "Voltage on Any Pin Relative to Vbb -0.3V to +20V (Vss-Vbb >= 4.5V)" which suggests you do need the "back bias" voltage first.This is enhancement-load NMOS. Power sequencing is -5, then +5, and finally +12 on startup, and the opposite order for shutdown. In practice this is usually accomplished by sizing the power supply decoupling appropriately.
Has anyone worked with Xbee devices transmitting a file? - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: December 02, 2020, 07:57:48 am
content: I'm looking at how I would distribute a remote firmware update to a micro where the only communication medium is a slow and unreliable wireless data stream.The Xbee has the option of a 100 byte packetized payload, or a 'transparent' byte by byte mode which emulates a physical wire. I believe in transparent modeit periodically checks its Tx buffer, packetizes whatever is there and sends it out as quickly as possible. The over the air protocol has a retry mechanism but there is no guarantee that every packet will be delivered.In theory an ancient serial protocol such as zmodem could be used in transparent mode providing that the sending code can cope with the long delays when an Xbee encounters a transmission/ACK error and goes into its pause-retry loop before finally succeeding or failing.Using the 100 byte packet mode would mean having to roll my own system that keeps track of which data blocks have been successfully transmitted and what still needs to be sent, plus the housekeeping of starting/ending/aborting transfers.
HASL vs ENIG for edge card connectors - Page 1
Forum section: electronics / projects

author: smbaker
author_rank: Regular Contributor
timestamp: October 18, 2021, 06:53:33 am
content: I assume the recommendation would be hard gold, but let's assume that is not an option (due to cost) and the choice has to be made between HASL and ENIG. This would be for hobbyist-grade boards, not commercial products. Of the two finishes, which is better?My naïve intuition says that ENIG would be better, because it's gold, and because it costs more. But, I've also read that the ENIG is not particularly durable, and scrapes off after relatively few insertions, and for that reason HASL would be preferred.Thoughts?

author: Miyuki
author_rank: Frequent Contributor
timestamp: October 18, 2021, 07:25:46 am
content: For single insertion and no touching after ENIGFor inserting ofter HASL is a good option and commonly used in the past

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 18, 2021, 08:46:22 am
content: Neither is great, because ENIG is thin, wearing through very quickly; while, tin or solder suffers from easy abrasion, and fretting corrosion against the gold-plated connector. (That is, tin and gold aren't metallurgically compatible, forming a brittle interface layer that flakes off easily under motion.)ENIG is probably better in general, since neither will be reliable in the long term / over many insertion cycles so at least ENIG gives you better connection at the start. But over the long term, yeah, neither is great, maintenance will be required (contact cleaning, give it a whack if it starts going flakey..).Tim

author: MichaelPI
author_rank: Contributor
timestamp: October 24, 2021, 12:53:10 pm
content: HASL could cause some issues with the planarity of the mating surfaces - so far I have never seen any HASL for edge card connectors. I am not even sure, if there is any connector with tin mating surface available (typically Au over a Ni layer), otherwise as Tim already mentioned you use to dissimilar metals for the mating surfaces.As far as I know, one would use hard gold plating for edge card connectors, if the board gets assembled multiple times.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: October 24, 2021, 01:49:18 pm
content: While I agree with every word in prior replies, there are two other factors which may make a difference in your choice.1. In many hobby grade connectors the contacts are not gold, making the metallurgical compatibility issue different if not moot.2. Hobby boards are likely using low density connectors. A little thought on the board edge design will allow enough movement to get fresh contact area on latter insertions.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 24, 2021, 02:38:53 pm
content: Application is unstated, so in either case the solution is as above.I think gold plated edge connectors are more common, but there certainly are exceptions. Most game console cartridges I believe were tin plated!Tim
Hasu USB to USB Controller Converter - USB Keyboard remapping - Page 1
Forum section: electronics / projects

author: Zucca
author_rank: Unknown
timestamp: January 30, 2019, 09:18:55 am
content: more info:https://linustechtips.com/main/topic/1026955-can-your-keyboard-do-this/https://www.1upkeyboards.com/shop/controllers/usb-to-usb-converter/The idea is very sexy to me, I am wondering if you hardware dragons are using something more powerful or smart.Let's discuss.

author: Zucca
author_rank: Unknown
timestamp: January 30, 2019, 09:20:25 am
content: https://www.eevblog.com/forum/microcontrollers/matrix-keyboard-needs-a-few-tricks/
Have any experience with Avia Semiconductors? - Page 1
Forum section: electronics / projects

author: bseishen
author_rank: Contributor
timestamp: October 16, 2016, 05:43:28 am
content: They make low cost load cell amplifiers. Heck of a lot cheaper than their ti counterparts. Cant seem to find a us distributor anywhere. I have a feeling any contract manfacture I use is going to have an issue with this.http://www.aviaic.com/Enindex.asp
Have i received a faulty IC ? - Page 1
Forum section: electronics / projects

author: IamSynthetiC
author_rank: Regular Contributor
timestamp: August 12, 2020, 10:36:21 pm
content: Greetings,I recently received a pre-made prototype-board (Power Supply) from PCBWay and the -12V rail does not work properly. The Linear Voltage Regulator (TPS7A3301RGWR) outpouts -14.86V instead of -12. Curiously the TSP7A33 is receiving-14.86V, and there seems to be no Voltage Dropout.I found other people having similar problems and complaining to TI's forum about this IC, but the solutions (if there are any) where not published.I would like to get a second opinion before i contact PCBway or TI, and potentionaly embarrass myself.Thanks for your time.Link to EasyEDA project*Edit : Fixed values.

author: langwadt
author_rank: Super Contributor
timestamp: August 12, 2020, 10:50:19 pm
content: Quote from: IamSynthetiC on August 12, 2020, 10:36:21 pmsense not connected? what is the voltage at FB?

author: Phoenix
author_rank: Frequent Contributor
timestamp: August 12, 2020, 10:54:25 pm
content: Is this a board of your design? I just want to make sure you are feeding the regulator -14.86V instead of +14.86V...

author: IamSynthetiC
author_rank: Regular Contributor
timestamp: August 13, 2020, 09:45:35 am
content: Oups, i forgot about the "-" in the values, i fixed it.This is indead my own design, but i have tried to follow the datasheets guidelines to the letter. The -12V rail is the only one not working.As for the voltage at the FB pin, measured at the C8 cap, it was -33uV when disconected from Vout. I found no shorts to ground.When connected to Vout, the voltage darectly at the Sense pin is as -14.86V, but at the Sense side of the R6 resistor is -29uV. And the C* cap remains at -33uV.
Have there been any germanium op amps? - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: April 06, 2023, 04:46:36 am
content: Maybe not even as an IC, perhaps some module or something.Of course it'd be easy to make one discreet, but have there been any made in numbers in the past?

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 06, 2023, 04:54:09 am
content: I don't think so.There were vacuum tube Op-Amps.Some history of Op-Amps.

author: moffy
author_rank: Super Contributor
timestamp: April 06, 2023, 05:35:13 am
content: About the nearest to a Ge opamp is the SiGe opamps e.g.https://www.analog.com/en/about-adi/news-room/press-releases/2010/rail-to-rail-sige-op-amps-offer-unmatched-speed-power-efficiency.htmlBy nearest I mean they at least have some Ge even if it is alloyed with Si, the transistors have very high bandwidths.

author: mikerj
author_rank: Super Contributor
timestamp: April 06, 2023, 09:13:44 am
content: A pure germanium process (rather than e.g. SiGe) would be very difficult to use for ICs. Ge has poor high temperature performance (even discrete devices can be ruined by clumsy hand soldering), poor oxide stability, and the lower bandgap invariably goes with high leakage.

author: SeanB
author_rank: Super Contributor
timestamp: April 06, 2023, 10:01:15 am
content: Plenty of modules were made for BT, used in phone exchanges, and a good number of bespoke potted assemblies were made as well, mostly for military use, as they were intended to replace the older tube based opamp units made by Philbrick, though with lower voltage, and no heater current needed.

author: alm
author_rank: Super Contributor
timestamp: April 06, 2023, 10:38:25 am
content: The document by moffy states that Philbrick (one of the major manufactors of opamp modules from discrete components) only switched from tubes to transistors when silicon transistors came around, but it would surprise me if nobody made such modules with germanium transistors for a low power or miniature application before silicon transistors became available / affordable.This page states thata discrete op amp with germanium transistors was introduced in 1958, it does not cite a specific source. But it may well be in one of the many references. From their description it does not appear to be a ready made module.
Have you done PCB projetc with pcbsino - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: March 01, 2020, 11:41:58 am
content: Hi,I have a a fairly mid-complexity design including BGA (0.65mm) ,it's a 4 layer joby and I have asked about prices on several PCB manufacturers from china, I get the best price from pcbsino.org, I want to know if anybody in here has tried them out? what's their quality? It seems they can do complex Jobs and do assembly and part sourcing too.