hybridfree/eevblog-posts huggingface dataset:
Looking for probe for HP 436A - Page 1
Forum section: electronics / beginners

author: turkalp.kucur
author_rank: Newbie
timestamp: December 07, 2024, 03:43:08 pm
content: Hello I have bought a hp 436a power meter. I could not get its probe. I searched internet unfortunately I could not find suitable probe for it. Is there any aliexpress or temu link for it? (I reside in turkey therefore I could not do shopping via ebay... )

author: xrunner
author_rank: Super Contributor
timestamp: December 07, 2024, 04:38:21 pm
content: I have one of those. They are old now and you will have to get a probe from the used marketplace, and they aren't cheap. Good luck.

author: stretchyman
author_rank: Regular Contributor
timestamp: December 07, 2024, 05:06:21 pm
content: I've got a spare 8481A and a E9323A but neither are cheap Im afraid. No cables either.Please PM me.J.

author: turkalp.kucur
author_rank: Newbie
timestamp: December 08, 2024, 10:14:01 am
content: Looks like I have to make my own probe. I would like to take a look at how to build my own probe videos. thanks.

author: janoc
author_rank: Super Contributor
timestamp: December 08, 2024, 01:34:29 pm
content: A tip - if you want more people to look at your post, put the summary of your question/problem in the subject instead of "Hello 2". Something like "Looking for probe for HP 436A".Most people don't read every post on the forum and only skim the subject lines to read things that look interesting. So with a meaningless subject you have lost probably 80% of readers before you have even got a chance to explain what you are after.

author: stretchyman
author_rank: Regular Contributor
timestamp: December 08, 2024, 07:37:32 pm
content: Normally referred to as a power HEAD not probe amd good luck building one as they're ridiculously complex.Just save your pennies and buy one.
Looking for probe for Hp 8591a - Page 1
Forum section: electronics / beginners

author: turkalp.kucur
author_rank: Newbie
timestamp: December 07, 2024, 03:41:05 pm
content: HelloI have just bought a Hp 8591a spectrum analyzer. unfortunately I could not get the probe, just device. I searched internet I could not find a suitable probe for it . note that I live in Turkey so I could not buy any product from ebay, just aliexpress or temu.. Is there a link to obtain probe?thanks.

author: jwet
author_rank: Frequent Contributor
timestamp: December 07, 2024, 07:46:25 pm
content: Unlike oscilloscopes, Spectrum Analyzer don't typically have standardized probes.The input to your analyzer is just 50 ohms which is the standard for RF gear. The input power should be kept low usually below 1 mW (0 dBm) and less than a volt.A common practice in a lab is make a simple probe some times. This "probe" is a series 950 ohm resistor and a piece of 50 ohm coax directly to the SA. This will give a 950 ohm DC impedance and an attenuation of 10x- this can be AC coupled by adding a series cap. Spectrum analyzers have wide dynamic range so throwing away a decade isn't so bad.There are fancy Hi Impedance probes for SA's but they are really expensive and only a well stocked lab would have one. A couple representative ones are the HP 41800, good to 500M IIRC and the HP 85024 good to 3GHz. The latter is about $3000!Good Luck

author: PGPG
author_rank: Frequent Contributor
timestamp: December 07, 2024, 11:38:22 pm
content: Quote from: jwet on December 07, 2024, 07:46:25 pmI would rather use 450 ohm resistor.

author: jwet
author_rank: Frequent Contributor
timestamp: December 08, 2024, 03:46:14 pm
content: You're right- 450 is for 10x my mistake. I've used the 950 in the past but it will knock off another 6 db. 1K is often a better value if you don't want to load bias circuits too heavily. I went back and looked at prices for the 41800, its now over $6K and the 85024 is over $8K. I think I have one of each in a drawer- I'm going to sell them off and go to Paris!One other thing that HP sold for a while was a "buffer" type gadgets that you could put on an SA that gave it a standard scope like interface- 1M 13pf. You could use standard scope probes generally at fairly low frequencies (<200M). The HP number was 15709- I had one, may still, lost to the mess. I built something like it with a hot FET op-amp (OPA656) based roughly on the circuit of the link below. It worked well up to about 75M with a pretty sloppy lab construction.https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.edn.com%2Fhigh-impedance-fet-probe-extends-rf-spectrum-analyzers-usable-range%2F&psig=AOvVaw1L3agh1A7oStgJXMk94V8t&ust=1733760973026000&source=images&cd=vfe&opi=89978449&ved=0CBQQjRxqFwoTCJDa_YnJmIoDFQAAAAAdAAAAABAEHave fun.
Hello - Page 1
Forum section: electronics / beginners

author: ShadowTroyer
author_rank: Newbie
timestamp: May 21, 2015, 07:03:59 am
content: Hey guys whats up??This is my first post here, i'm a from Brazil and i have a little i.t assistance here, i'm actually studying a lot of eletronics and hardware material, first of all i'd like to apologize for my bad english, i've learnt by myself and sometimes i can write some mistakes that'll sound crazy lolAnyway,I'd like to ask you guys, if there is any possibilities of using a laptop LCD with a VGA cable in a normal computer, is it possible to make the connection with some kind of circuit or adaptation?

author: samnmax
author_rank: Regular Contributor
timestamp: May 21, 2015, 07:21:25 am
content: Welcome!Yes, it's possible to reuse laptop LCD panels and connect them to VGA/DVI/HDMI. You need a universal LVDS controller board, take a look here, for example:https://sites.google.com/site/lcd4hobby/lcd-tft-as-pc-monitorBut you need to match the pinout of the LCD panel, the resolution, 1 or 2 LVDS channels, 8 or 6 bits... It's not plug-and-play at all!Some of the boards can be configured by jumpers and others must be programmed with the correct settings.Some eBay sellers will send you the correct cable and will flash the PCB with the correct settings if you tell them the LCD panel part number.
Hello & a question EZ Digital GP-1305 - Does anybody have experience or opinions - Page 1
Forum section: electronics / beginners

author: Rusteh
author_rank: Newbie
timestamp: May 15, 2016, 07:58:24 pm
content: Hello everybody, i'm new to the community and whilst i have a question that hopefully people can help with, thought a little introduction was in order.As may be expected from my posting in the beginners section, i am just beginning in this hobby, having flirted on the side lines for a long time. I started an apprenticeship as a maintenance electrician in 1988! and now work as a project manager and have finally decided to pursue electronics as a hobby. Slowly building up a collection of components and equipment and have completed my first small project to build a 555 timer PWM circuit to dim LED's for a bench lamp i hope to build shortly.Anyway, to cut to the chase, i am looking at options for a bench power supply and whilst funds are not that much of an issue, i would prefer to mitigate costs until such a time as i am more proficient. I have seen the usual cheap suspects from China and would prefer something a little more established and reliable, even if it means looking 2nd hand - to that end i have a few that i am keeping an eye on a few from the likes of TTi which have plenty of reviews/information out there.I have also seen a promising looking supply - EZ Digital GP-1305 but the only thing i can find is that they're a Korean company that used to be part of LG? Does anybody have any knowledge on this company or their power supplies and the quality/reliability that can be expected?

author: Signal32
author_rank: Frequent Contributor
timestamp: May 16, 2016, 10:37:41 pm
content: Hi,Welcome to the forum!I'm not familiar with EZ Digital products. What I would do for a "new" power supply is get a used one off eBay.There are lots of good HP/Agilent power supplies going for very decent prices ($150-$250, maybe even ~$100).See:Link1Link2Do you have any specific requirements in mind ?

author: Rusteh
author_rank: Newbie
timestamp: May 17, 2016, 08:28:01 am
content: Thanks Signal,No specific requirements in mind, though at the minute i have quite an interest in LED's and circuits so would be nice to have at least 30v/3a for the 100w LED's. Up to press i aim to build circuits based on what interests me rather than any particular need, for my next project i hope to build a voltage reference source (no particular need, just fancy doing it)Unfortunately HP/Agilent stuff seems much less ubiquitous on eBay UK and far more expensive and due to size/weight international purchases can often cost as much to post as buythough i will look through the links you provided as not everything has to come from the USA.Regards,Russ
Hello again its beamin my last account got hacked need help with unix - Page 1
Forum section: electronics / beginners

author: lexibeamin
author_rank: Contributor
timestamp: March 10, 2023, 10:23:28 pm
content: Much to many's dismay beamin is back,I got my tablet stolen with all my accounts two factors and crypto got hacked, the person that found my tablet was computer savvy and almost cost me 6k$ in crypto, not to mention ruining all my email and phone accounts including this account.But anyways, Im taking a unix IT securities degree and need help with relearning unix. Any good resources? Since im legally blind I can take the tests from home, so I'm searching for a good source to help with answers...

author: vk6zgo
author_rank: Super Contributor
timestamp: March 11, 2023, 12:20:09 am
content: Quote from: lexibeamin on March 10, 2023, 10:23:28 pm

author: lexibeamin
author_rank: Contributor
timestamp: March 11, 2023, 03:44:34 am
content: Quote from: vk6zgo on March 11, 2023, 12:20:09 amyou make those really good hf videos on the beach right?I tried my arduino 40 meter(forget the name those little kit 7 watt jobs from india) and could hear new England from md about 1000km but never could make contact like you did on the beach.

author: MK14
author_rank: Super Contributor
timestamp: March 11, 2023, 05:03:17 am
content: Quote from: lexibeamin on March 10, 2023, 10:23:28 pmTo check my understanding...Do you mean, you are planning on cheating?Assuming we are talking about exam or marked practical work, etc questions. Which you are NOT suppose to get help with (during the time you do them)?

author: vk6zgo
author_rank: Super Contributor
timestamp: March 11, 2023, 06:10:55 am
content: Quote from: lexibeamin on March 11, 2023, 03:44:34 amNah, that's Peter Parker, VK3YE.He is sometimes active on this forum, but I haven't seen any postings from him recently.

author: lexibeamin
author_rank: Contributor
timestamp: March 20, 2024, 03:39:39 pm
content: Yeah I gave up on linux too hard to see and of course I mean cheating. Every test now is online so you just ctrl c ctrl v the question into google then click the right answer. Sure I could pass the test by figuring it out, but that would take too much time.I switched majors back to a med tech where I just play with germs under a microscope in the lab of a hospital. Figure its a better way to help people since i dropped out of med school 20 years ago. Give me a drop of blood or spit and a microscope and I can tell you why you are sick, much easier then I can say why your damn wrapper isnt working and making linux not work. That was so frustrating, germs, PCR (that CSI things where you see the gels with the blue bands that tells you who the killer was) and DNA are much simpler.
hello all  - Page 1
Forum section: electronics / beginners

author: leoibb
author_rank: Contributor
timestamp: June 10, 2015, 12:38:51 pm
content: Hello all not sure if this is the right place but I am curious I would like better signal in bad areas on mobile phone . Is there a way of doing this

author: Richard Crowley
author_rank: Super Contributor
timestamp: June 10, 2015, 02:19:17 pm
content: I think most of us would "like better signal in bad areas on mobile phone".Some possible solutions might be...1) Get a phone with better performance.2) Switch to a carrier with better coverage in YOUR "bad areas".3) Use an external antenna and/or a cell phone signal amplifier for a fixed-area solution (not useful for mobile service).Please at least complete your user profile to reveal what country you are in.Many questions and answers (including this one) are specific for certain places, and this forum covers the entire planet.

author: leoibb
author_rank: Contributor
timestamp: June 13, 2015, 06:52:04 pm
content: Thankyou for reply . I've looked at signal amplifiers slightly difficulty is obtaining one
Hello community people! - Page 1
Forum section: electronics / beginners

author: Harrykane3
author_rank: Newbie
timestamp: March 12, 2017, 07:55:26 am
content: Hello mate,Greetings to all! I am new member into this community. I would like to say hello to all of you guys? Hope you are doing good. Please accept me into this community.Thank you so much!

author: ebastler
author_rank: Super Contributor
timestamp: March 12, 2017, 10:37:13 am
content: Hello, and welcome aboard!Once you are ready to ask questions about your current project, electronics in general, etc., it might be helpful to give a brief summary of you rbackground. (I.e. your level of electronics knowledge and practical experience.) That will help us to give you the right level of advice.Cheers,Juergen

author: MrAl
author_rank: Super Contributor
timestamp: March 12, 2017, 05:01:07 pm
content: Hi,Hello and welcome.

author: ollihd
author_rank: Regular Contributor
timestamp: March 12, 2017, 05:30:54 pm
content: Welcome!

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: March 12, 2017, 09:01:12 pm
content: Welcome!
Hello EECF! - Page 1
Forum section: electronics / beginners

author: kiknwing
author_rank: Newbie
timestamp: August 31, 2013, 01:04:18 am
content: Hi, I'm a newb and since this is my first post I would like to talk about newbish things like...is Electrical and Electronic Engineering just about placing math where you need it on a circuit board to achieve desired results? Furthermore, if this is true then what will I have to know in order to work on products that are similar to one another?Thanks,-kiknwing

author: eman12
author_rank: Contributor
timestamp: August 31, 2013, 01:51:47 am
content: Hi & welcome,Yes Electrical and Electronics Engineering is widely related to mathematics. as an Electronics student In university you are involved completely to math. You have to analysis the different circuits by math. most of the times you must have a good view about physics too.Regarding your second question, what about so called "instrumentation"?

author: eman12
author_rank: Contributor
timestamp: August 31, 2013, 01:56:57 am
content: Oops!you changed and modified your post kiknwing, So my second answer to your question is nonsense NOW!

author: xrunner
author_rank: Super Contributor
timestamp: August 31, 2013, 02:08:12 am
content: Quote from: kiknwing on August 31, 2013, 01:04:18 amOnly up to a point ...

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: August 31, 2013, 02:17:44 am
content: Awesome picture.there is hope for me yet
Hello every, pls my flow meter is bad, how can I calculate the flow rate ? - Page 1
Forum section: electronics / beginners

author: nyame
author_rank: Regular Contributor
timestamp: January 02, 2021, 07:22:28 pm
content: Hello pls, I have a line with a bad flow meter what are the steps required to calculate the flow rate of this line ?Thanks

author: msat
author_rank: Regular Contributor
timestamp: January 02, 2021, 07:37:01 pm
content: You need to provide us with much more information before we can really even begin to help.

author: IanB
author_rank: Super Contributor
timestamp: January 02, 2021, 08:01:23 pm
content: Quote from: nyame on January 02, 2021, 07:22:28 pm1. Repair or replace flow meter,2. Use working flow meter to measure flow.

author: mikerj
author_rank: Super Contributor
timestamp: January 02, 2021, 08:31:33 pm
content: Time how long it takes to fill a container of known capacity.Install a calibrated orifice plate and measure pressure drop.
Hello Everyone! - Page 1
Forum section: electronics / beginners

author: siconic
author_rank: Contributor
timestamp: December 14, 2017, 02:30:07 am
content: Hey guys,I have been watching EEVBlog videos, and LOVE them. I have dabbled in Electronics since a kid, and am quite experienced in soldeiring, but never designed anything... until now!I have decided to give my first circuit a go. I am excited to be here, and more excited to learn and find more projects!I already sent it out to OSHpark and ordered 3, since it was a cheap experiment. Let me know if you think it will work, and what you think I should change!

author: siconic
author_rank: Contributor
timestamp: December 14, 2017, 02:57:44 am
content: I am so sorry. I rushed that post, and I forgot a few details.I am attempting to build an all in one ESP-01 flasher, but that can be used to flash, reset, test, and use the GPIO and UART outputs to test a program, without needing to remove it constatly. So plug it into the usb pourt, flash it, reset, and test a relay for example, all without unpluging.I already have a second revision, with 7 header pins. They are GPIO0, GPIO2, 3.3V, 5V, GND, TX and RX. Basically the same, just add appropriate headers, and re lay it out. I can post the layout also.

author: Raj
author_rank: Frequent Contributor
timestamp: December 16, 2017, 08:33:39 am
content: Can't find a reason for it to not work, but I think you'll spend more than a ready-made one

author: apelly
author_rank: Unknown
timestamp: December 16, 2017, 10:24:58 am
content: Hello.

author: Mighty Burger
author_rank: Regular Contributor
timestamp: December 17, 2017, 02:53:46 am
content: Quote from: Raj on December 16, 2017, 08:33:39 amOftentimes the learning experience, the entertainment, and all the other great things about DIY have a much greater factor than just the price.
Hello Everyone - Page 1
Forum section: electronics / beginners

author: yamadanao
author_rank: Newbie
timestamp: July 18, 2017, 10:23:30 am
content: Hello Everyone

author: GreyWoolfe
author_rank: Unknown
timestamp: July 18, 2017, 11:45:28 am
content: Well, hell back and welcome.

author: welpester
author_rank: Contributor
timestamp: July 18, 2017, 02:11:49 pm
content: Hello you too!-Welpester

author: alanb
author_rank: Frequent Contributor
timestamp: July 18, 2017, 02:46:26 pm
content: Hello YamadanaoYou can introduce yourself via this link.https://www.eevblog.com/forum/chat/new-member-please-introduce-yourself/

author: hushaoxin
author_rank: Contributor
timestamp: July 20, 2017, 12:48:11 pm
content: where are you come from?
hello everyone， this is Maksvell from New york  - Page 1
Forum section: electronics / beginners

author: Maksvell Mejia
author_rank: Newbie
timestamp: April 21, 2025, 08:34:21 am
content: Joining to try to troubleshoot and repair some garage equipment. So far have just been searching and benefitting from past posts. Thanks to all over the years, have been such a life saver!

author: BILLPOD
author_rank: Frequent Contributor
timestamp: April 21, 2025, 12:47:30 pm
content: Good Morning Maksvell Mejia, Welcome to the Forum. Enjoy your ride.

author: Maksvell Mejia
author_rank: Newbie
timestamp: April 24, 2025, 07:33:50 am
content: Thank You , I'm sure I will
Hello Experts Help Needed - Page 1
Forum section: electronics / beginners

author: tiomev
author_rank: Newbie
timestamp: September 21, 2023, 12:41:25 am
content: Hello,I'm a pilot. I want to talk/listen on my airplane's air traffic control radio and listen to messages from an aviation app on my cell phone at the same time. Both are wired to my headset. I used a phone jack Y connector to connect the radio (wired output) and a Bluetooth receiver (wired output) to the headset's mono earphones jack. The cell phone with the aviation app connects via Bluetooth to the Bluetooth receiver.Unfortunately, It's not working. I get low volume and high static when everything's connected. To make it more annoying the headphones are mono, the Bluetooth receiver's stereo, and there's lots of wire and male-male and female-female connectors between everything.Is this a ground problem or am I missing some electronics magic in this pile of spaghetti? Your expertise is much appreciatedThanksMarkVmev@navarro-inc.com

author: alligatorblues
author_rank: Regular Contributor
timestamp: September 21, 2023, 12:54:37 am
content: You could get a bluetooth earpiece for one device, and a wired earpiece for the other device. Listen to one with each ear.

author: tiomev
author_rank: Newbie
timestamp: September 21, 2023, 02:34:17 am
content: I appreciate your response. I thought of stereo headphones with one source on a side. But that's a work around, not a solution. I want both sources to come through both earphones on the headset.ThanksMarkV

author: coppercone2
author_rank: Super Contributor
timestamp: September 21, 2023, 02:35:35 am
content: maybe audio isolation transformers

author: brucehoult
author_rank: Super Contributor
timestamp: September 21, 2023, 02:47:33 am
content: You need a mini mixer. Maybe something like this:https://www.amazon.com/TENEALAY-powered-control-passive-X21/dp/B09WDMYYBPI note though that is is design for line levels between other equipment (i.e. 1 V). It might or might not be ok to drive your headphones from directly. As it's passive it probably can't source as much current as the original inputs can supply, so you might need to follow it with a simple amp (or pay a little more for a powered one to start with).You can also make your own device using an opamp. Some can drive headphones.

author: tiomev
author_rank: Newbie
timestamp: September 21, 2023, 04:29:54 am
content: GreatThanksMarkV
Hello From Naperville IL - Page 1
Forum section: electronics / beginners

author: mbrando
author_rank: Newbie
timestamp: December 31, 2023, 01:47:05 am
content: Hey everyone,I've recently started my interest in electronic repairs. While I have repaired a few guitar amps, stereo's and motor speed controllers, I'm still learning. I hear the EEVblog is the place for learning and a great electronics community.Happy New year!- Mike
Hello From NY - Page 1
Forum section: electronics / beginners

author: Tehmanac
author_rank: Newbie
timestamp: September 06, 2021, 07:19:24 pm
content: Just wanna say hello, Ive been watching David for a long time and Louis and really enjoy there shows, made me think hay cant I play with guitar pedals and found kits and boards and other things related to guitar pedals i started this 2 years ago (Jan2020) and it was a lot of fun starting off, but never went anywhere because of covid I hope soon things will go back to normal so i can start Building guitar pedals for myself...

author: Old Printer
author_rank: Frequent Contributor
timestamp: September 08, 2021, 01:34:14 am
content: I find that since Covid I have more time to devote to electronics. not less. Some of my normal activities involve close proximity to groups of people, and not doing as much of them gives me more time for this hobby. Sorry it has hit you the other way around, but welcome to the forum.

author: Rick Law
author_rank: Super Contributor
timestamp: September 08, 2021, 01:56:56 am
content: Tehmanac, Hello back from NJ and welcome to the forum.

author: Tehmanac
author_rank: Newbie
timestamp: September 08, 2021, 08:11:58 pm
content: HELP!!!I made a mistake with my username...I meant for it to be TECHANAC NOT TEHMANAC.can some one please delete this account so that i can re do it with the right spelling.
Hello, & Help! - Page 1
Forum section: electronics / beginners

author: ulterior_modem
author_rank: Newbie
timestamp: November 02, 2013, 07:53:13 am
content: Hello, all. I'm sorry for the lack of detail; I usually stick to the software side of things. I'm looking for a bit of help with what I thought was a simple change.I've got a GE desk phone I've been using for ages. It does not have a headset port, so I thought I'd add one. I 've rerouted the output for the speakerphone to a 2.5mm minijack. I've done the same thing with the speakerphone mic input.When I went about testing I found that the output is fine; however, the input is at greatly decreased volume. I have to practically chew on my headset's mic.It had an electret mic attached to the input. Do I need to build and amplifier circuit, or...?Thanks,ulterior_modem

author: Whales
author_rank: Super Contributor
timestamp: November 02, 2013, 08:56:39 am
content: Hello there!QuoteDon't worry. A more descriptive thread title would help us help you, howeverMost likely the signal level generated by your headset mic is very poor compared to the original mic for the phone. You have a couple of options:(1) Find the amplification circuity in the phone and adjust itIf you are lucky, the phone design already has an amplifier in it you can adjust. Either by a twisting a potentiometer (hopeful) or by replacing a resistor (more realistic) with a different value. If you are unlucky, then you mic's output is directly digitised without amplification, so the next option is your only bet.(2) Make your own pre-amp (not as hard as it sounds)A single op-amp in feedback and a few resistors will doUsing a potentiometer will allow you to have variable volume control, if you want itIt will need to source power from somewhere, so you will probably want to put this in the phone's plastic bodyIf you are unsure what I'm talking about, look up using 'op-amps' as amplifiers and 'op-amp feedback'.

author: Stonent
author_rank: Super Contributor
timestamp: November 02, 2013, 08:57:15 am
content: What's the ohms rating of the microphone?

author: lapm
author_rank: Frequent Contributor
timestamp: November 02, 2013, 09:46:29 am
content: Quote from: Stonent on November 02, 2013, 08:57:15 amModern phones use microphones that are more like capacitors. You can get those very small ones... Thing in OP's case is that hes headset probably has microphone that is not as sensitive as the one in phone. So he need pre-amplifier for the signal.Also just remembered this: Make sure your wires are correctly. Ground wire on headsets negative side and signal wire on microphones signal side... I have seen some of these capacitor microphones loose sensitivity if connected wrong way in...
Hello, I have a special ic, how can I program it? Can I program a non-PIC? I'm t - Page 1
Forum section: electronics / beginners

author: david smth
author_rank: Contributor
timestamp: February 08, 2025, 09:39:21 am
content: Hello, I have a special ic, how can I program it? Can I program a non-PIC? I'm talking about programming another IC other than PIC.

author: NE666
author_rank: Frequent Contributor
timestamp: February 08, 2025, 10:01:13 am
content: And, we're all supposed to just guess which make and model of IC you have in front of you?

author: Haenk
author_rank: Super Contributor
timestamp: February 08, 2025, 10:30:22 am
content: Information overload on my side.But lets put it simple: You can't. For many reasons.

author: silly sausage
author_rank: Regular Contributor
timestamp: February 08, 2025, 10:40:10 am
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: radiolistener
author_rank: Super Contributor
timestamp: February 08, 2025, 11:07:38 am
content: Quote from: david smth on February 08, 2025, 09:39:21 amWhy another? Try to program PIC.

author: david smth
author_rank: Contributor
timestamp: February 08, 2025, 11:39:05 am
content: Don't reveal yourself from your name, otherwise I wouldn't understand it. I was curious and asked what's wrong with it. MC145414P ic不要從名字中暴露自己，否則我無法理解。我很好奇，就問這是怎麼回事。 MC145414P積體電路我只是問這個，你根本不懂我的意思

author: Gyro
author_rank: Super Contributor
timestamp: February 08, 2025, 12:20:00 pm
content: The MC145414P is a switched capacitor low pass filter. It is not a programmable part.

author: jpanhalt
author_rank: Super Contributor
timestamp: February 08, 2025, 12:24:51 pm
content: If you want help, please post in English.The MC145414P is a dual tunable low-pass filter. The full datasheet probably shows details on how to tune using a a variety of capacitors and resistors. A snippet of the incomplete datasheet is attached. It does not appear to be tunable pr programmable by firmware code.

author: radiolistener
author_rank: Super Contributor
timestamp: February 08, 2025, 12:25:53 pm
content: اندا بوليه بربهاس ايڠڬريس؟

author: inse
author_rank: Super Contributor
timestamp: February 08, 2025, 05:25:47 pm
content: “not recommended for new design“ like 40 years ago?
Hello, please can a corrupt firewall prevent an HMI from powering UP ? - Page 1
Forum section: electronics / beginners

author: nyame
author_rank: Regular Contributor
timestamp: December 13, 2018, 03:04:48 pm
content: Hello, please can a corrupt firewall prevent an HMI from powering UP ?

author: Kilrah
author_rank: Unknown
timestamp: December 13, 2018, 03:12:55 pm
content: Maybe?

author: perieanuo
author_rank: Frequent Contributor
timestamp: December 13, 2018, 05:08:02 pm
content: Hi,what's an hmi?Envoyé de mon iPad en utilisant Tapatalk

author: dmills
author_rank: Super Contributor
timestamp: December 13, 2018, 07:12:13 pm
content: Possibly, if the thing is trying to do a network boot via something like TFTP or NFS or such from a server in whatever it is controlling (fairly commonplace), but I would normally expect these to be in the same network.Still if you did something like misconfigure the firewall to cause an address collision I don't see why not.Wireshark can be very much your friend for debugging this kind of thing.Regards, Dan.

author: Kilrah
author_rank: Unknown
timestamp: December 13, 2018, 07:55:07 pm
content: Quote from: perieanuo on December 13, 2018, 05:08:02 pmHuman-Machine Interface. Industrial control panel.But he gave zero info about what kind he has and his setup, so "maybe" is the best answer he can get.

author: cdev
author_rank: Super Contributor
timestamp: December 13, 2018, 10:00:10 pm
content: Maybe it looks for a server somewhere on the net to verify a licensing status?

author: nyame
author_rank: Regular Contributor
timestamp: December 14, 2018, 05:47:14 am
content: The HMI is AB panelview plus 600, (touch screen)

author: perieanuo
author_rank: Frequent Contributor
timestamp: December 14, 2018, 08:07:23 am
content: Quote from: nyame on December 14, 2018, 05:47:14 amHi,I was looking, your device hasn't a firewall itself.So just disconnect the ethernet, restore power and that's your answerimo, it's broken if after repowering from scratch without lan cable the device doesn't power up.after, the job translates from IT to electronics

author: perieanuo
author_rank: Frequent Contributor
timestamp: December 14, 2018, 08:09:28 am
content: Quote from: Kilrah on December 13, 2018, 07:55:07 pmtks,i'm old school, I refere to this thing as PLC or automate or whatever, i'll try to review my vocabulary, tks
Hello, please i wish to know how to wire this Position feedback indicator  - Page 1
Forum section: electronics / beginners

author: nyame
author_rank: Regular Contributor
timestamp: September 19, 2022, 08:24:25 am
content: Hello,Please i wish to know how to wire correctly the valve limit switch feedback indicator, including the potentiometer model, and the new smart model.will appreciate any help.Thanks

author: Infraviolet
author_rank: Super Contributor
timestamp: September 22, 2022, 02:14:16 am
content: What are you hoping to have the device do? What type of signals do you want to get out from it in the various different conditions it can detect? Nothing in the diagram gives any hints of potentiometers being present, it just looks like switches with common, normally closed (NC) and normally open (NO) terminals each being tapped depending on how a rod with two cams on it is rotated.

author: BeBuLamar
author_rank: Super Contributor
timestamp: September 22, 2022, 09:38:14 am
content: Look like it has 2 limit switches to indicate the end of travel in each direction.
Hello Please i wish to know if any School of Practical Accounting is good and le - Page 1
Forum section: electronics / beginners

author: nyame
author_rank: Regular Contributor
timestamp: January 24, 2022, 08:10:29 am
content: HelloPlease just to inquire if any one can be help, i wish to know if the School of Practical Accounting is good and legitThanks

author: Ian.M
author_rank: Super Contributor
timestamp: January 24, 2022, 09:11:15 am
content: Quote from: GoogleN.B. Trinidad and Tobago is an independent nation *NOT* part of the UK.If a professional qualification recognized by a smallish Caribbean island nation 'ticks the boxes' you need for career progression, great. If not, look elsewhere!
Hello, please looking attachment did i isolate the control valve correctly ? - Page 1
Forum section: electronics / beginners

author: nyame
author_rank: Regular Contributor
timestamp: September 19, 2022, 08:35:01 am
content: Hello, please looking at my attachment did i isolate the control valve correctly ?

author: rstofer
author_rank: Super Contributor
timestamp: September 19, 2022, 05:49:31 pm
content: Can you get a datasheet from:http://www.hoyea.com/Industrial-Hydraulics.htm?

author: nyame
author_rank: Regular Contributor
timestamp: September 21, 2022, 02:09:11 am
content: Hello Rstoferthanks for you replysorry but i could not download any datasheet from that location.am just a beginner, i wish to understand the isolation theory on those directional valve.
HELP!!! Wanted installing Partkeepr on windows 7 platform - Page 1
Forum section: electronics / beginners

author: tech111
author_rank: Newbie
timestamp: September 29, 2018, 10:17:32 pm
content: Hello everyone.First of all a big thanks for taking the time to read this postUntil now i spend weeks trying to install partkeepr on windows platformwithout any luck yet. (https://www.partkeepr.org/)I was wandering if someone would be so kind to explain (for dummy's)a step by step tutorial how to install the program.I am positive that beside me thousands of people will be thankful.THANK YOU.
Help!!!How to make a low-cost biped robot - Page 1
Forum section: electronics / beginners

author: SatoruSatake
author_rank: Newbie
timestamp: November 29, 2014, 07:14:33 am
content: Terrible! My professor asked me to do a project about biped robot. Whereas I have no real experience in manufacture. I' m very confused where I should start with. I know something about control theory.....Can someone give me some advice? Bow......

author: Paul Price
author_rank: Super Contributor
timestamp: November 29, 2014, 07:55:49 am
content: Easy. Your first stop should be your Japanese equiv. to "Toys R Us" store.Many toy companies have figured how to do it for a few yen, only with a small motor and cams, why can't you then?Hint, small motor, gear reduction to drive cams that position legs, robot is always wearing big snow shoes, "A walking robot walks best walks always with small steps!". Big Feet balance a low center of gravity to not tip over.Once you got that right, you can move on to perfect your own Asimo.A control theory fanatic like Chairman Mao once said, "Two Steps Forward, One Step Backward." His idea of progress..maybe you can start dancing with that idea.

author: SatoruSatake
author_rank: Newbie
timestamp: January 07, 2015, 07:40:59 am
content: Nice answer! I got it!
Help!! - Page 1
Forum section: electronics / beginners

author: picmantheman
author_rank: Newbie
timestamp: April 25, 2015, 02:08:46 pm
content: Hi,Having a little trouble with shifting a voltage.I have a signal that is 1.7V for LOW and 3V for HIGH with ref to GND.I need to read this with a micro so need a very simple circuit, has anyone any idea's on how to bring the LOW down to ground so i can read it please?

author: SeanB
author_rank: Super Contributor
timestamp: April 25, 2015, 02:14:31 pm
content: Simple single transistor inverter will do, using 3 forward biased diodes in the base side to provide a rough 1v8 level shift and then the transistor providing the rest as it is switched on. If you need it to be not inverted simply use another inverter afterwards. that should work well enough.

author: picmantheman
author_rank: Newbie
timestamp: April 25, 2015, 03:21:52 pm
content: Works very well, thankyou.

author: Zero999
author_rank: Super Contributor
timestamp: April 25, 2015, 06:25:13 pm
content: If your microcontroller has a built-in comparator, you could use it with the voltage on one of the inputs set to half way between the two levels (2.35V) and the other input connected to the signal.

author: picmantheman
author_rank: Newbie
timestamp: April 26, 2015, 12:17:10 pm
content: Well it does have a compartor but this would very slightly complicate the overall design, the simple transistor did work very well, but thanks for the reply. I could of course ac coupled it and pass it to a voltage follower but again, more bits....
help! how to program a NSC800N controller without a FTDI chip? - Page 1
Forum section: electronics / beginners

author: ali6x944
author_rank: Frequent Contributor
timestamp: January 26, 2016, 09:28:50 pm
content: how to program a NSC800N controller without a FTDI chip?and could i use USB , or rs-232 from my laptop?

author: SL4P
author_rank: Super Contributor
timestamp: January 26, 2016, 10:50:06 pm
content: Need a lot more information...The NSC800 family are standalone processors - so there is an assumption you have any RAM & ROM hanging off it along with some I/o...http://www.digchip.com/datasheets/download_datasheet.php?id=714420&part-number=NSC800N&show=inlineTo program that collection of chips, you'll need an assembler or compiler and linker, or are willing to toggle some switches to get your program into memory.If it's a complete 'controller' as suggested in the title - there will be some bootloader in ROM, or other tools to load/update the programs it needs to 'run'.As a Z80 clone, there will be a lot of code out there, but likely you'll have to get dirty puttiing it in to the specific hardware of your 'controller'. if it's a packaged controller from the 80s or 90s - There a chance it already has a simple basic, or other language for machine control in the ROM already.Dies it have a serial terminal port or other means of talking to the controller - or is it a single chip stuck in a block of anti static foam?

author: ali6x944
author_rank: Frequent Contributor
timestamp: January 27, 2016, 10:35:22 am
content: I will post all nesesary details and all chip nombers i have for dynamic ramsUnfortunely i don't have another AVR or pic to do any icsp

author: SL4P
author_rank: Super Contributor
timestamp: January 27, 2016, 10:51:30 am
content: It sounds like you are gettin in over your head to design and support what is in reality an obsolete technology.If you decide to go ahead, post photos and schematics/details of any boards you are planning to use - and search google for things like 'Z80 single board computer project'.Plenty of people have made these systems, but I suspect they started from a better resourced position with Frys, Mouser, Digikey on their doorsteps.You may be better starting with a pre-tested kit that you can build and understand before you dive in.Congratulations on the interest to start!Important note: The NS chip min clock is 300khz vs the Z80 runs down to DC. a lot of help when building a board from scratch!
HELP! I'm new here. Need suggestions. Please. thank you - Page 1
Forum section: electronics / beginners

author: lezyrhk
author_rank: Newbie
timestamp: October 04, 2014, 12:11:02 pm
content: Good evening everyone,I am a 5th year ECE student in the Philippines and I would like to ask for your suggestions on possible topics on thesis. It would be nice if it falls under FPGA project/system implementation or system hardware applications or analog mixed-signal and digital ic design using synopsys.Thank you.

author: Simon
author_rank: Unknown
timestamp: October 04, 2014, 12:32:24 pm
content: Please DO NOT post the same topic 4 times ! it is totally unnecessary, will annoy everyone and may get you banned eventually. once only is enoughThank you.

author: lezyrhk
author_rank: Newbie
timestamp: October 04, 2014, 12:59:19 pm
content: Alright sir, I'll keep that in mind. Thank you.
Help! identifying a switch Marconi TF2155 PSU - Page 1
Forum section: electronics / beginners

author: Atom
author_rank: Regular Contributor
timestamp: March 01, 2018, 05:48:00 pm
content: Hi to everyone! Recently i bought on ebay a marconi tf2155 PSU , the description was saying that it was broken... tested the main power transistor ..all good, tested the rectifying diodes.. all good it turned out that was a bad switch that remaind pressed....the 0-5V switch. after "unlocking" the broken switch and pressing the 0-15V switch the PSU started working.the thing is that i need a new switch, so i'm searching for someone that could tell meif there is a specific name for this kind of switch.go to the google drive archive for more photos :https://drive.google.com/open?id=18n2Ho19B9CXZ0o3cY24Ekjs6SUSyVk0BBTW for the ones intrested in the specs it's a 0-60V 0.5A 0-30V 1A 0-15V 2A 0-5V 2A .....well it's a PSU from the 80' or the 70'. And maybe if someone stumble upon the manual while searching ...well fell free to send it because i couldn't find it.If someone needs more info or photos feel free to askbye.

author: Andy Watson
author_rank: Super Contributor
timestamp: March 01, 2018, 06:12:55 pm
content: Marconi had a habit of re-badging power supplies from other manufacturers. Try searching for Weir 413.Try this, half-way down this page is a link for the "Weir 400 series" - it might be close to your requirements.https://www.vintage-radio.net/forum/showthread.php?t=95600Are there any manufacturers markings on the switch? Finding an exact replacement may be difficult.

author: Atom
author_rank: Regular Contributor
timestamp: March 01, 2018, 08:21:14 pm
content: Well spot on i didn't know marconi rebranded psu i thought they were a good company, on the switch there are no markings

author: Atom
author_rank: Regular Contributor
timestamp: March 01, 2018, 08:33:03 pm
content: So on the manual of the weir 423 the equivalent of my marconi one the switches are listed as AB400-F02020-08-0-00........i tried searching that string on google but nothing

author: Atom
author_rank: Regular Contributor
timestamp: March 01, 2018, 08:47:46 pm
content: Well thanks andy for your answer ... by finding the manual i was able to understand that the 5V switch when pressed suppress the control of the pot so you obtain a fixed 5V output.....well i dont really care of the fixed 5v output, and i can achive the 5V from the 0-15V rangeso guess what ..that switch will remain broken, i bought the unit used and i don't have even the plastic caps.Thanks again.
HELP! LM3914 Proteus (battery level indicator) - Page 1
Forum section: electronics / beginners

author: juriesnake
author_rank: Newbie
timestamp: February 25, 2014, 09:33:04 pm
content: the circuit in these video from dave(eevblog)is not working for me. i have same value of resistors from that tutorial but nothing happensmy school project is manual charger using DC Motor. It will charge a battery and then detect if its battery level using LM3914. My battery is single 3.7v.btw, i attached schematic file from proteus. can please someone check this? please help me(sorry for my poor english)
HELP! New to HW, hobbyist RF collection/analysis - Page 1
Forum section: electronics / beginners

author: BG2Archer
author_rank: Newbie
timestamp: November 27, 2018, 03:50:53 pm
content: Okay, so, I am super new to hardware when it comes to anything RF related. Meaning, I have very little idea, as to which direction I should go. My hobby/project is analyzing a signal, starting from visual identification (bandwidth, center frequency, etc etc), down to the literal 1's and 0's. The frequency range(s) I would like to look at is 1MHz - 6GHz, with no particular thing in mind, just want try to analyze and figure out some HAM signals that my mentor sends out occasionally (he doesn't have internet or phone, otherwise I'd probably be asking him these questions). My questions are....1- What hardware do I need?I've been looking at this packagehttp://nutsaboutnets.com/sidekick/2- I would ideally like to use one of the below to do visual analysis, but definitely not limited to them.https://edoras.sdsu.edu/doc/matlab/toolbox/signal/wvtool.htmlorhttps://www.silvaco.com/products/analog_mixed_signal/waveform_viewer/waveform_viewer.html3- I currently don't know of any open-source or commercially available software that would allow me to perform demodulation or post-demodulation analysis, any recommendations?4- Would the nutsaboutnets sidekick or another SDR suit my purposes? Or do I need to delve more into the HW realm and get in way over my head?
Help! Trying to figure out how to hook up analogue switch - Page 1
Forum section: electronics / beginners

author: fuzzfuzzfuzz
author_rank: Newbie
timestamp: April 23, 2021, 11:33:20 am
content: Hi,I'm trying to use some DG333A analogue switches (to switch audio). I've been looking at the datasheet but I'm not entirely sure how I'm supposed to hook it up for single supply operation.The chip has a V- and a GND pin. Should I connect both to ground? Or if not which one do I want to connect to ground?Sorry I'm sure this is really obvious to anyone who knows what they are doing..Thanks!

author: Ian.M
author_rank: Super Contributor
timestamp: April 23, 2021, 11:47:51 am
content: Its fairly simple: The internal analog switches themselves run off the V+ and V- supplies, and all their pin voltages must *always* be within the rail voltages connected to V+ and V-. Both V+ and V- must be connected. The control logic uses Gnd as its input logic '0' level reference so you need to connect Gnd to the ground(0V) of whatever is controlling it. The control circuit must *NOT* be floating with respect to V+ and V-, and for correct operation, Gnd must be between (V+)-4V and V-.

author: fuzzfuzzfuzz
author_rank: Newbie
timestamp: April 23, 2021, 11:53:26 am
content: Thanks!
Help! Xbox series x HDMI retiming Pads missing - Page 1
Forum section: electronics / beginners

author: trend4u2
author_rank: Newbie
timestamp: March 27, 2025, 09:33:28 am
content: Hello, i need your help for my xbox series x, when i take out the retimer ic, some pads are missing, did you know when pads are going to connect (my concern is in the bottom side from my pict the other has been connected) , TQ

author: benj38
author_rank: Frequent Contributor
timestamp: March 27, 2025, 12:11:11 pm
content: What is the part number of the IC?Looking at its datasheet has a good chance of providing you with the information you need.

author: trend4u2
author_rank: Newbie
timestamp: March 27, 2025, 12:24:44 pm
content: Ic name is nb7n621m, xbox series x retimer ic. I find online file and its say nc, i don't know what that mean.

author: trend4u2
author_rank: Newbie
timestamp: March 27, 2025, 12:28:01 pm
content: Quote from: trend4u2 on March 27, 2025, 12:24:44 pm

author: trend4u2
author_rank: Newbie
timestamp: March 27, 2025, 12:29:57 pm
content: Quote from: trend4u2 on March 27, 2025, 12:28:01 pm

author: benj38
author_rank: Frequent Contributor
timestamp: March 27, 2025, 12:33:49 pm
content: Quote from: trend4u2 on March 27, 2025, 12:24:44 pm"nc" means No Connection. In other words, you can forget about these pads. Problem solved

author: squadchannel
author_rank: Frequent Contributor
timestamp: March 27, 2025, 12:49:30 pm
content: one differential pair pad is still stripped.

author: TERRA Operative
author_rank: Super Contributor
timestamp: March 27, 2025, 01:23:47 pm
content: How was that chip removed? With a blunt axe?(And why was it removed anyway?)The diff pair is repairable, but if the chip was removed with that much damage, I doubt the ability of the same person to be able to repair the damage and reinstall a new chip....

author: trend4u2
author_rank: Newbie
timestamp: March 27, 2025, 01:41:49 pm
content: With hotgun but its take long to remove that ic, and at the end use mini grinder, xbox still working btw, but after several attemps put new ic, is still no display so i assume maybe missing pad is the reason.