hybridfree/eevblog-posts huggingface dataset:
Anybody recommend a good low cost quad Fet op-amp? - Page 1
Forum section: electronics / projects

author: v8pete
author_rank: Newbie
timestamp: March 10, 2015, 07:41:50 pm
content: Hi folks,My first post here! Have been away from the bench for a bit, so I'm not as up to speed on what nice parts are out there as I used to be. I'm looking for a good low cost quad fet op-amp for sample/hold applications and I'm wondering if there is anything out there much better than the TL054, for the price. Key specifications are low initial offset, low offset drift temp coefficient, and reasonable slew rate & bandwidth. Also looking for ideas regarding dual fet op-amps with similarly good DC specs.Cheers!Pete

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 11, 2015, 12:58:25 am
content: Unless you want to pay for brand new parts or bleeding-edge processes (e.g., fairly ordinary-spec amps are available that are built on freaking SiGe RF processes), TL0*2 or LF412 is still de regeur for that sort of thing.Offset is still the worst offender; there are OPA, LT and AD series parts that are better-trimmed FET or MOS types, and higher bandwidths are available. And rail-to-rail, but they are usually CMOS, which are always noisier (even if not R2R).Tim

author: dannyf
author_rank: Super Contributor
timestamp: March 11, 2015, 01:01:40 am
content: QuoteHow low/reasonable is your "low"/"reasonable"?

author: f5r5e5d
author_rank: Frequent Contributor
timestamp: March 11, 2015, 04:52:55 am
content: power supply and signal range are important specsCMOS op amps have improved, can be competitive for lower voltages common todayand "rail-to-rail" input and output can enable using lower supply Vfor more device options and more flexible layout dual packaged op amps are more common choice today - in smt quad op amp packages with complicated filter/feedback circuits can be harder to place/route all the passive parts near the chip than with dual packaged op amps

author: Zero999
author_rank: Super Contributor
timestamp: March 11, 2015, 09:25:04 am
content: What are your other requirements?TLE2074TS274MCP604How about using a dedicated IC such as the LF398?http://www.ti.com/lit/ds/symlink/lf298.pdf

author: Rog520
author_rank: Regular Contributor
timestamp: March 11, 2015, 05:45:10 pm
content: Low cost -- I usually give Microchip a try first. To my knowledge they do mostly CMOS, but are very price competitive even for their higher-end op-amps.
Anybody that can give some input on voltage detector for lawn automover? - Page 1
Forum section: electronics / projects

author: Tony.T
author_rank: Regular Contributor
timestamp: May 17, 2017, 08:04:02 am
content: I have a Husqvarna automover for my lawn. Want to build a detector for the cables in the ground.Anybody that can point out a schematic for it? What will work for this purpose?thanks.

author: Rerouter
author_rank: Super Contributor
timestamp: May 17, 2017, 08:21:52 am
content: Is this to prevent you from hitting cables, or to follow a route via a buried cable?If the first, do you have access to the wiring to injlect a signal?, do you only want to detect mains, or telecom aswell

author: Tony.T
author_rank: Regular Contributor
timestamp: May 17, 2017, 11:30:22 am
content: It's just to find exactly where it is on the lawn... If one needs to dig..I have access to the cables to insert voltage if necessary.

author: jeroen79
author_rank: Frequent Contributor
timestamp: May 17, 2017, 11:53:39 am
content: So what is the role of the lawnmower?It only works on the surface and shouldn't hit anything buried below it.What sort of cables are you looking for?Just mains?Can you access both ends of these cables?

author: Tony.T
author_rank: Regular Contributor
timestamp: May 17, 2017, 04:01:12 pm
content: Yes...i can access both ends. Today the lawnmover can itself detect the cable in the ground, and bounces back and changes the direction to continue cutting the grass another direction. But if i want to dig some hole in the ground i need to be able to detect it by myself. Just want to avoid cutting the cable and kill the functionality. But even if i can access both ends i do not want to disconnect the charge station where all the wires are connected to and then insert higher voltage. I just want to be able to detect the wires when in operation...just as the lawnmover does...https://youtu.be/k4etAYu9rc8?t=9m25smy wires are not visible its under the ground.

author: jeroen79
author_rank: Frequent Contributor
timestamp: May 17, 2017, 04:37:58 pm
content: So the cables in question are the mower's boundary wires?Can't you just make the mower run over a spot you where want to dig and see if it continues to drive over the spot or changes direction?If you want to make some sort of handheld sensor you should investigate what the base station does with the wires.What voltage and current can you measure? What about frequency/waveform/dutycycle?If you open up the mower, can you identify the sensor?If so, what can you measure around it?You could temporarily connect a short run of above ground wire for testing.

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: May 17, 2017, 05:25:47 pm
content: Came here to see a device that could automatically move my lawn and was disappointed, now I'll have to do it myself.
Anybody use Instek Power supplies? - Page 1
Forum section: electronics / projects

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 11, 2013, 06:47:32 am
content: Does anybody have any experience using the Instel GPD4303S power supply. I was looking for an alternative to the Rigol or the BK9130. What attracted me to it is that is has 1mV and 1mA resolution.Any feedback would be welcomed.Robert Bhttp://www.tequipment.net/InstekGPD-4303S.html

author: micro_freak
author_rank: Contributor
timestamp: March 15, 2013, 01:43:12 am
content: We use an Gw instek power supply in the lab, and it is a fine piece of equipment. It is a much older model that the one you mentioned. I think you can trust the brand if that was a concern of yours.regards

author: RichardSim
author_rank: Newbie
timestamp: March 15, 2013, 10:12:54 pm
content: I have a couple of older GW Instek power supplies also, and they're great. They came from a large cell phone manufacturer's development lab that was shut down, and as far as I'm concerned if they're good enough for them, they're more than good enough for me!
Anybody with a Hantek HT25 Probe - Page 1
Forum section: electronics / projects

author: chinoy
author_rank: Regular Contributor
timestamp: April 11, 2022, 03:53:35 pm
content: So I am trying to build this probe for my scope.Why not just buy one ?.Well the HT25 does not work with COP so I would actually have to buy 2. i.e. the HT25 and the HT25COP thats about 200$ USD which is more than what my scope cost me. (Price in my country). On aliexpress its only 14$ I think. But we have a trade war going on.I would rather have one solution which works on any ignition.I got this idea from scannerdans forum.https://drive.google.com/file/d/1TdjjBygBFbAsvjbExIHkSZwymr2Vn6Cv/view?usp=sharingThis will work with any type of ignition. And I think it will work far better than the hantek unit. Because its made from copper. And I can tune the length and dia.Where I am stuck is how do I calibrate it to real world values. i.e. I need to know what value cap and resistor is used in the HT25.The only info I could find was this. Again from scanner dans forum.For the HT25At Scope BNC: + to Ground 33k ohms,At Pickup: + to Ground 33K ohmsScope end to Pickup End 0 Ohms on both + and Ground conductors.So any over voltage protection and attenuation going on inside the black box on the lead isn't being done by resistors.Another Idea I am thinking of trying is a pickup coil from a Timing strobe light. But that again will not work for Coil On Plug.Any inputs or ideas much appreciated. I will start testing some initial ideas in a few days. Waiting on some copper sheets to land up.What would really help would be to know whats inside the black box on the probe.Here is another idea where he just uses a wire. With the HT25Just fond this. As per this a simple wire also works. But he still uses the HT25.https://youtu.be/e59atXyNNPA
Anyboy have experience with the TiCoServo Library? - Page 1
Forum section: electronics / projects

author: Youkai
author_rank: Regular Contributor
timestamp: May 09, 2019, 10:46:52 pm
content: I'm working on a project that uses NeoPixel strips and servo's. In my other thread a member warned me that the pixel library disables interrupts during commands to update the pixels and that this might lead to jitter in the servos:https://www.eevblog.com/forum/projects/borderlands-style-jewelry-box-research-thread/msg1850465/#msg1850465I was doing some research and saw that there is a TiCoServo servo library that seems to be able to run along side the NeoPixels because it doesn't use interrupts. So I have two questions:1) Does anybody have experience with this library? Is it good?2) I'm having trouble telling if this library will work with my 5v Pro Micro:https://www.sparkfun.com/products/12640which has a ATmega32U4. Can anyone confirm if this will work?
Anyone able to identify this switch and cap? - Page 1
Forum section: electronics / projects

author: deephaven
author_rank: Frequent Contributor
timestamp: June 11, 2015, 11:03:27 am
content: Could someone identify this switch and cap? There is no manufacturer's marking on it. Trawling through RS and Farnell doesn't reveal anything.

author: Cliff Matthews
author_rank: Unknown
timestamp: June 11, 2015, 11:44:20 am
content: I tried Google image match on the top left, but nothing turns up. It's a bit of work, but you might come close with this search:https://www.google.ca/search?safe=off&hl=en&site=imghp&tbm=isch&q=tactile+key+low+profile&oq=tactile+key+low+profile

author: deephaven
author_rank: Frequent Contributor
timestamp: June 11, 2015, 12:25:50 pm
content: Thanks for the reply and suggestion, Cliff. I looked through all the images on the search you suggested but couldn't find anything. Also, like you, couldn't find a match on image search either.

author: Landrew2390
author_rank: Regular Contributor
timestamp: June 12, 2015, 04:13:49 pm
content: The closest I could find was this model from MEC Switches.http://www.mec.dk/files/apem/brochures/MEC/5G-E-F-B.pdfThe have to same plunger design, but the pinout is different from the one you have. I double checked, MEC doesn't make a two lead tact switch in any of the lines I looked at.

author: deephaven
author_rank: Frequent Contributor
timestamp: June 12, 2015, 07:26:32 pm
content: Quote from: Landrew2390 on June 12, 2015, 04:13:49 pmMany thanks for taking the trouble to look for it. Strange there's no manufacturer's mark on the thing.

author: Landrew2390
author_rank: Regular Contributor
timestamp: June 12, 2015, 08:31:53 pm
content: It was just by chance I was looking at those parts earlier this week. When I saw the design of the plunger, I went back through my browser history.After looking at the pictures again, the part you have could be a Chinese copy of a MEC part that they left two pins off of. I would check the spacing on the pins. If you're lucky, you can clip two pins off a MEC unit and it will fit.

author: deephaven
author_rank: Frequent Contributor
timestamp: June 13, 2015, 07:27:42 am
content: Wow, that's a coincidence! I'll look through the MEC catalog. Thanks.
Anyone aware of new attempted CCD in analog camera now CCD 135 size? - Page 1
Forum section: electronics / projects

author: billrule
author_rank: Newbie
timestamp: February 22, 2019, 08:39:39 pm
content: I was interested to note in an airport display for Sony(?) cameras that the CCD size has crept up to the original 35mm film size. Surely this overcomes part of the shirtload of hassles involved in developing a "digital backpack" for a classic analogue SLR camera? Besides any of the ill-fated crowd-funded campaigns, anyone aware of some Quixotic attempt to achieve this goal?

author: Gyro
author_rank: Super Contributor
timestamp: February 22, 2019, 08:43:48 pm
content: I'm sure at one time you could get 35mm CCD back conversions for film SLRs from the manufacturers, I don't know if you still can. Nikon rings a bell.

author: JacobPilsen
author_rank: Regular Contributor
timestamp: February 22, 2019, 09:09:20 pm
content: There areFull-frame DSLRalready.So retrofit is just supply and demand issue.

author: billrule
author_rank: Newbie
timestamp: February 22, 2019, 09:24:36 pm
content: Quote from: Gyro on February 22, 2019, 08:43:48 pmIf this was indeed the case, there are a sad lot of crowdfunders attempting to reinvent the wheel.

author: Gyro
author_rank: Super Contributor
timestamp: February 22, 2019, 09:41:42 pm
content: I think the crowdfunders main aim is to do it relatively cheaply.Some references:https://en.wikipedia.org/wiki/Digital_camera_backand a Nikon patent from 2012 (more about accurate sensor positioning), with some reference to 2008 too...https://nikonrumors.com/2012/12/17/nikon-patents-a-digital-back-for-35mm-film-slr-cameras.aspx/

author: helius
author_rank: Super Contributor
timestamp: February 22, 2019, 10:30:27 pm
content: The first 35mm full-frame DSLR was theContax N Digitalreleased in 2002.However, digital backs have never been a "retrofit issue". Each back must be designed from the beginning for a specific flange focus distance: in the medium and large format worlds these are shared across models over many decades and multiple manufacturers, but in 35mm cameras they are custom to a single camera model. The Kodak DCS 100, the first digital SLR system, was designed in 1987 to fit the Nikon F3. Later DCS systems were designed to fit the Nikon N8008s and the Canon EOS-1N, before they became fully integrated platforms that were not compatible with stock bodies.
Anyone buying a PMPB55ENEA MOSFET beware! - Page 1
Forum section: electronics / projects

author: Alaezae
author_rank: Contributor
timestamp: January 18, 2024, 05:43:16 am
content: Hello,I was building up some boards for a solar charger I'm doing as a project when I noticed that the pin one designation for the switching FETs on the IC doesn't match my layout. I thought I had just made a mistake, it's a weird package and I'm not very experienced with layout. However, when I went back to the datasheet to change my layout, my layout actually agreed with the mechanical drawing they had!The mechanical drawing's pin numbers are flipped from the earlier diagram! I put them side-by-side in the same orientation and they're reflected across the y-axis. Does anyone know if this was intentional for some reason or is it really a mistake?Either way, I'll be waiting with bated breath for my $38.50 check from Nexperia so I can buy a new set of fixed boards...

author: ArdWar
author_rank: Frequent Contributor
timestamp: January 18, 2024, 05:59:55 am
content: Both are correct.IC pinouts are customarily depicted in transparent top down view, while mechanical drawings are depicted in actual (as you see) bottom up view.

author: Alaezae
author_rank: Contributor
timestamp: January 18, 2024, 06:11:36 am
content: I didn't know that! Guess it's probably good to learn here instead of on a much more expensive project...Thanks!

author: ArdWar
author_rank: Frequent Contributor
timestamp: January 18, 2024, 06:41:28 am
content: Note that this is not universal either.Pinouts are almost always transparent top down, with some exception notably thru hole transistors for historical reason.Mechanical drawings are more varied. Packages with no lead (QFN, BGA, etc) and packages with prominent bottom pads are often shown bottom up view. Packages with leads and nothing important below (DIP, SOIC, QFP, etc) are often top down view. Leaded packages with pads (HVQFP, PSOP, etc) sometimes use transparent top down, or even show both 4 angles. Read the notes carefully.
Anyone can identify this SMD (SOT23?) component? - Page 1
Forum section: electronics / projects

author: F1GWR
author_rank: Regular Contributor
timestamp: August 22, 2024, 12:34:11 pm
content: Should typically be a N-channel MOSFET (in between an LTC2928 supervisor enabling an LTM4602 SMPS). But in that case what is strange:- command input is in pin 2 (usually devoted to source)- and there is no gate resistor in seriesChecked every media I could but found nothing. In addition "T" marking seems upside-down regarding the "610"Who could decode this marking (photo)?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 22, 2024, 01:46:43 pm
content: Diode test? It could be a BJT to extend voltage range (cascode).Tim

author: F1GWR
author_rank: Regular Contributor
timestamp: August 22, 2024, 03:50:21 pm
content: Quote from: T3sl4co1l on August 22, 2024, 01:46:43 pmThanks Tim.Absolutely correct!It's a PNP with base in pin 2.One additional info is that the supervisor is powered by its Vcc pin (HVcc tied to ground). Therefore the internal circuit is powered by 3.3 V (datasheet). LTM4602 is 4.5 V supply min. Hence the need of a voltage translator...Now still looking for the true reference of this transistor...

author: F1GWR
author_rank: Regular Contributor
timestamp: August 22, 2024, 04:02:47 pm
content: Just received this from a friend (see second page):https://www.farnell.com/datasheets/2304443.pdfSeems to contradict the BJT hypothesis.Weird
Anyone come across LCD HMC16298SG-PY-12-4 - Page 1
Forum section: electronics / projects

author: bubba198
author_rank: Contributor
timestamp: May 02, 2015, 10:22:41 pm
content: Hi everyone,I purchased this LCD: HMC16298SG-PY-12-4 but Google has been unhelpful.Other than this marking the PCB shows a silk screen printed PRO29803 and that's itAny help with data sheet will be appreciated! The LCD was made in the tenth week of 2005.Thank you

author: RDC
author_rank: Newbie
timestamp: September 08, 2022, 01:19:19 am
content: Sorry for digging up an oldie, but it's one of the very few links that came up when searching around for this display.I found one of these things in an old ADT control panel, and it was still plugged into that control board. While all the rest of it was missing, it did let me power it up enough to be able to figure out the pinout and such of this thing. So for any that ever run across or fancy a go with this LCD it might be useful.This was a HMC16298SG-PY-12-5, and as it's connected to the ADT control board here...1 - 12v, Backlight2 - GND, Backlight3 - GND4 - VDD5 - GND (thru 0ohm jumper)6 - RS7 - RW8 - E9 - D010 - D111 - D212 - D313 - D414 - D515 - D616 - D7The VDD and logic signals are all 3.3v on this one.I connected a Saleae Logic Analyzer to it and managed to get it's power up and error messages logged. On power up it fills all of the characters and the underlines, then after a second blanks the screen, and then a good 15 seconds or so after that it displayed 'Open Ckt' on the top row and then just kept repeating that every second. So that at least let me see how it was doing all of that.I used the HD44780 Analyzer in Saleae to export the data, which granted is a bit rough on the eyes and leaves a bit to be desired, but it should be enough for anyone looking to use one of these to get it at least somewhat working. I may wire the thing up to a PIC and have a mess around with it a bit more at some point, but sorting the pinout for now was about all I was interested in.
Anyone cross reference an SR51 semiconductor? - Page 1
Forum section: electronics / projects

author: Chris Wilson
author_rank: Super Contributor
timestamp: May 20, 2014, 09:04:59 am
content: I have a device that uses some transistors marked as SR51 Googling brings me to 2 leaded diodes. These are plastic cased three wire semiconductors, probably a switching transistor driving the gate of an SCR. Anyone recognize them? Thanks.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 20, 2014, 10:16:29 pm
content: http://alltransistors.com/transistor.php?transistor=28926Does it look like a TO-92? Do you have any good ones to diode-test -- do they look like BJTs?Tim

author: Chris Wilson
author_rank: Super Contributor
timestamp: May 20, 2014, 10:42:05 pm
content: Hi Tim, that looks right. It also has PH on it (Philips?). I found this datasheet, it's a Darlington, and onethat I can gain access to in circuit tests as such. Thanks for your help. It also ties in with other Philips devices with the leading B missing.
Anyone else making their own glass tube amps? - Page 1
Forum section: electronics / projects

author: metrologist
author_rank: Super Contributor
timestamp: February 12, 2023, 09:39:10 pm
content: This was pretty cool to see done in a home shop...(not my project, of course)

author: metrologist
author_rank: Super Contributor
timestamp: February 12, 2023, 09:54:54 pm
content: Similar stuff...

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 12, 2023, 10:29:42 pm
content: Plenty from glasslinger.https://www.youtube.com/@glasslinger/videos

author: fozzyvis
author_rank: Regular Contributor
timestamp: February 13, 2023, 09:48:07 am
content: What I love most in these kind of videos is the amount of "This requires expensive, very specific tools... Unless I can write down what I actually need to do, strip that to the bare minimum and build that myself" combined with "I'll try this a billion times before it works and become kind of expert in this extremely narrow field at the same time".Glass lathe? Who needs that?Special vacuum pump?

author: BrokenYugo
author_rank: Super Contributor
timestamp: February 19, 2023, 06:07:33 pm
content: After seeing glasslinger do it, I knew it was possible. After seeing Jdflyback get extremely impressive results with very limited equipment (no high vacuum system!), it's on the "shop space permitting" list. As I now understand, production tubes are/were actually only roughed down with a pump, the final hard vacuum is made entirely with the getter flash.Same goes for flame triodes and zinc oxide tunnel diodes. I think one could also do their own germanium alloy transistors fairly easily if you can start with a prepped wafer. I find the whole concept of DIY active devices interesting.

author: IanB
author_rank: Super Contributor
timestamp: February 19, 2023, 06:53:11 pm
content: This for me is the classic one to watch when I want to chill out and unwind.I always like the beginning of the video with the Swiss Army knife and cutting out freehand. It's like "Oh, really? So basic?"https://youtu.be/EzyXMEpq4qw

author: Andy Watson
author_rank: Super Contributor
timestamp: February 19, 2023, 07:24:25 pm
content: Quote from: IanB on February 19, 2023, 06:53:11 pmDitto.Claude was attempting to reproduce some of the first triodes to mark the centenary of their invention/discovery, using contemporary tooling - hence he made most of the tooling too! I think he had to "cheat" with the vacuum pump - had to go with a turbo-molecular pump. There's more of the back-story on this stie:http://paillard.claude.free.fr/index.html
Anyone ever made/copied a garage door opener transmitter? - Page 1
Forum section: electronics / projects

author: KTP
author_rank: Frequent Contributor
timestamp: October 05, 2011, 10:49:36 pm
content: Hi guys. It has been awhile since I have logged on here.I had a garage door opener we bought to move Frankenstein's monster in our halloween ride a few years ago and recently converted it to a new use - opening our garage door. I lost one of the transmitters over the years and they are $40 at the store. Also, they are quite large and I would like one for my motorcycle keychain.So....I popped the cover off of the xmitter I have and see that it is quite simple. I have not traced out the circuit yet, but I am guessing it is a little microcontroller that sends a pulse stream to a 49mhz? oscillator circuit.Anyone ever tried to roll their own?

author: Jimmy
author_rank: Regular Contributor
timestamp: October 06, 2011, 12:04:09 am
content: some roller doors have coded transmitters which can be a pain to replicate. You could hot wire it to remote control the push button so you can control it from your mobile phone or something.

author: Joshua
author_rank: Regular Contributor
timestamp: October 06, 2011, 03:40:05 am
content: I suspect it's somewhere advanced else every burglar would whip up something and go around taking what they please. Not for sure tho

author: Unknown
author_rank: Unknown
timestamp: October 06, 2011, 05:47:43 am
content: Just do a google search for kits and designs there are hundreds about eg:http://www.jaycar.com.au/productView.asp?ID=KC5458&form=CAT2&SUBCATID=965#11.But unless you doing it for the sheer heck of building some trivial electronics you can buy fully built rolling codeunits with a receiver and a couple of smallish remotes for around $40.http://www.rhinoco.com.au/product/RCX
Anyone familiar with this chip? - Page 1
Forum section: electronics / projects

author: PaulAm
author_rank: Frequent Contributor
timestamp: April 15, 2020, 01:43:25 am
content: I was sorting through a grab bag and came across a 24 pin DIP marked Seeq DQ52B13H-350The only data sheet I can find is not in english and I can't find a description anywhere. That might have been Seeq Technology sold to LSI in 1999 and might be a memory of some kind. Anyone have any clues?

author: greenpossum
author_rank: Frequent Contributor
timestamp: April 15, 2020, 01:58:41 am
content: Seeq was an EEPROM maker. A search on Seeq 52B13 got this:https://deramp.com/downloads/mfe_archive/050-Component%20Specifications/Seeq/Seeq%2052B13%2052B13H.pdfIt's an Intel 2816 compatible. 350 is probably nanoseconds.

author: PaulAm
author_rank: Frequent Contributor
timestamp: April 15, 2020, 07:31:30 pm
content: Yeah, after a little work I found a 1990 Seeq databook on bitsavers with the full specs. It's a 2Kx8 EEPROM.

author: MadTux
author_rank: Frequent Contributor
timestamp: July 14, 2020, 10:53:52 am
content: Highly valued for those who have Fluke 5440B, since DQ52B13H sometimes crap out in there and 2816 isn't that compatible ;-D.
Anyone figured out the Renishaw probe interface circuitry? - Page 1
Forum section: electronics / projects

author: alanambrose
author_rank: Frequent Contributor
timestamp: November 06, 2022, 12:50:23 pm
content: I'm imagining an accurate Schmitt trigger, maybe a little logic and signal conditioning?I see on the MI 8 interface it says:"WARNINGThe MI 8 interface must NOT be used with anIn-line signal conditioning module (SCM).Renishaw high precision tool setting arms (HPA) andsome TS20 probes are supplied with a SCM. The SCMprovides an OCT output, if an SSR output is required,then a Renishaw SRR convertor must be incorporatedbetween the SCM and the CNC machine control."- which suggests better signal conditioning on the higher-end probes. 'OCT' apparently just means 'open collector' - and in the Renishaw world they describe that as 'analogue'. I think that means the level triggering is downstream.Anyone actually traced one of these and/or figured out the schematic?Alan

author: BGracia
author_rank: Newbie
timestamp: October 13, 2025, 12:12:30 am
content: Hello,Did you ever figure this out? I have a Renishaw TS20 with the SCM. Docs say you need a Renishaw SRR convertor between the SCM and the CNC controller. I can't find any.BrianG

author: H.O
author_rank: Frequent Contributor
timestamp: October 13, 2025, 03:45:40 pm
content: I don't know anything about the SCM or SRR but a "while" back (almost 11 years to the day...) I reverse engineered the MI-8 interface.Please find my take on it attached. Usual disclaimer, no guarantees that it's correct yaddayadda.
Anyone got info on this old 4-digit DIP LED 7-seg display? - Page 1
Forum section: electronics / projects

author: AussieBruce
author_rank: Regular Contributor
timestamp: July 12, 2021, 10:10:16 am
content: I’m trying to figure out an old 4-digit LED display, see thumbnail. The lead spacing is 0.1”, on a DIP pitch, and on the bottom is marked RS587-096. I tried that number on the RS website (with and without the ‘RS’), no match. IIRC, I may have seen something similar in an old HP instrument, so it might be an HP part.There are 7 leads on one side and 6 on the other. That suggests that this may be a passive 7-segment digit display, with 4 anode digit strobe lines. It would be nice to know what the other 2 pins are however. Can anyone provide any info? Just a manufacturers type no would be great.

author: retiredfeline
author_rank: Frequent Contributor
timestamp: July 12, 2021, 10:15:49 am
content: One could be DP. Or both could be NC. A bit of trial and error with a battery and limiting resistor should suss out the pinout.

author: Benta
author_rank: Super Contributor
timestamp: July 12, 2021, 11:14:12 am
content: HP is a good guess. Broadcom these days.

author: floobydust
author_rank: Super Contributor
timestamp: July 12, 2021, 06:04:22 pm
content: I've always just put it on a breadboard and taken a few volts from a battery plus a resistor to find the pinout of bubble LED displays. Sometimes they are dim it's not worth building anything to use them.That one looks really vintage but no gold leads... they went to a DIP format for the HP5082 or QDSP6064 series. National Semi also offered some for a while, NSL prefix.

author: mdijkens
author_rank: Regular Contributor
timestamp: July 13, 2021, 12:35:41 pm
content: Maybe this helps:I've used a couple of these in my projects...

author: ledtester
author_rank: Super Contributor
timestamp: July 13, 2021, 03:30:15 pm
content: The image didn't show up.Now the image shows up!I took the liberty of downloading it and reposting it so it'll be on the forum for posterity...Here's a video demonstrating how to figure out a random 7-segment LED module using a multimeter:How to tell segments and common cathode/anode of 7-Segment LEDs - leefileshttps://youtu.be/3QtPplHcnmQ

author: mdijkens
author_rank: Regular Contributor
timestamp: July 16, 2021, 04:56:39 pm
content: Thanks ledtester; not aware you could upload the image on eevblog

author: jbeng
author_rank: Regular Contributor
timestamp: July 16, 2021, 11:02:45 pm
content: From what I've read, the part number you've given crosses to a Siemens DL340M display. If that's correct, this might be the data you're after.

author: floobydust
author_rank: Super Contributor
timestamp: July 17, 2021, 04:43:49 pm
content: I recognize the Monsanto datasheet and part number, they made a lot of the very early LED displays in the mid 1970s.
Anyone had any luck with APA102 leds? - Page 1
Forum section: electronics / projects

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: July 12, 2016, 10:15:21 pm
content: I just can't seem to get these goingHere's a/the datasheet:https://cdn-shop.adafruit.com/datasheets/APA102.pdfThe protocol is easy enough, but I have all sorts of weird issues. Starting to think the 1000 pieces I got off of alibaba is counterfeit. As soon as I touch the LED with a soldering iron the internal bonding wires just melt. They seem to be intact on the current PCB I'm working on but still I cant really get them to work....EDIT: Here's my schematic:PS: those DNP jumpers were placed just because I was unsure if they needed termination when I designed the circuit, plus the footprint makes for an easy point to hook on to for debugging the stream after it's passed through the LEDs. Which reminds me.. I should probably check that!Any ideas? Or if all else failes, anyone one got a source with known-to-work LEDs? I really just need ~40 pieces for now...Thanks!

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: July 13, 2016, 09:48:04 pm
content: Allright.Big PEBCAC moment here!I've been using3V3and the datasheet, though unclear on many points, is very clear about them needing5V. I feel so stupid right now...

author: Corporate666
author_rank: Unknown
timestamp: July 15, 2016, 06:50:11 am
content: glad you figured out one of the issues.One thing to keep in mind about the APA102 is covered here:https://cpldcpu.wordpress.com/2014/11/30/understanding-the-apa102-superled/the LED delays the output by half a pulse, which is why you need to feed in extra pulses at the end to "push the data through". The APA102 datasheet says one frame, but it actually varies depending on how many LED's you have in the string. I chased this issue for a while before solving it.Overall, the APA102's are great. I've driven them at 20+Mhz and they were fine.
Anyone have a .pwl file describing contact bounce for use in LTspice - Page 1
Forum section: electronics / projects

author: seamusdemora
author_rank: Regular Contributor
timestamp: December 15, 2020, 10:20:00 am
content: After a quick search for alternatives tosimulate contact bounce in LTspice, it seems that a.pwlfile may be the best choice.I've searched for such acontact bounce .pwl file, but haven't found one. Does anyone know if such a thing exists? Alternatively, if you think there are better options than using a .pwl file to model contact bounce, I'd like to hear from you also.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: December 15, 2020, 11:11:06 am
content: Contact bounce is not a well defined signal.It is some weirdness between "on" and "off" and the amount of weirdness varies significantly between different switches.Jack Ganssle has written a nice article about it, including scope pictures from different switches. One of his switches did not "bounce" at all, but had a gradual slope depending on pressure. I think it was such a rubber button from a remote control unit.https://html.duckduckgo.com/html?q=jack+ganssle+contact+bounce+pdf

author: Ian.M
author_rank: Super Contributor
timestamp: December 15, 2020, 11:58:25 am
content: I did some work on efficiently simulating switch bounce in LTspice here:https://www.eevblog.com/forum/beginners/ltspice-and-mechanical-switch-problem/msg3184358/#msg3184358Its currently set up for a hard contact switch that transitions sharply from conductive to open circuit and visa-versa. If you want to model a switch with resistive behavior during transitions, you'd need to give the CSW model negative hysteresis. It does *NOT* model the micro-bouncing that typically causes the on resistance to fluctuate after each contact closure.Another approach would be to capture real switch bounce current and voltage data with a scope and process it into a format LTspice can use, e.g a WAV file, then use it for a source controlling a behavioral resistor . . .
Anyone have access to DAVID TT-1 Automatic turntable for 3D scanner?  - Page 1
Forum section: electronics / projects

author: txescientist
author_rank: Regular Contributor
timestamp: April 24, 2018, 07:46:55 pm
content: Anyone have access to DAVID TT-1 Automatic turntable for 3D scanner?

author: Jan Finkel
author_rank: Newbie
timestamp: July 02, 2018, 11:56:18 am
content: We got it in our lab, but didn't use it like half a year, cause our David SLS-3 was broken by an intern by accident. Now we using Spider manually, waiting for release ofRoboticScan, hope its price will not be much higher than David's table. What exactly do you ask?

author: txescientist
author_rank: Regular Contributor
timestamp: July 02, 2018, 06:46:16 pm
content: Needed the USB Descriptors, but found other way to use old turntable with David 5...Thank you anyway!
Anyone have experience using those bluetooth/wifi relay modules?   - Page 1
Forum section: electronics / projects

author: jacamo
author_rank: Contributor
timestamp: December 27, 2022, 10:33:36 pm
content: Hello everyone,I have a project at work that involves taking an old school score board and making it bluetooth/wifi controllable. The easiest way I can think of is using something like this relay modulehttps://researchdesignlab.com/8-channel-relay-board-bluetooth.htmlBut when I look at how the app works it will only be able to switch on or off. What I need is the ablity to choose which certain relays will act like a switch and which ones will at like a button. The buttons on the control board are connected to solenoids which advance each digit individually so they can't just switch them on.Anyone have experience using these sorts of things and have some advice. I am trying to avoid redoing something thats already out there.Also attached is a photo of the connector they are using for the control box. I would like to get another one so If needed I could swap back to the original controller.

author: Terry Bites
author_rank: Super Contributor
timestamp: December 28, 2022, 08:53:31 am
content: You need a monostable on the sender inputs to get a button (momentary) action. An On-Off cycle for a short period of your choosing.Remember the relays will have a minumum operate and release times. Say +10ms operate and 5ms release.Use a non-retriggerble mono becasue it will also effectively debounce your sender's buttons. A 555 will be fine.My worry would be that the bluetooth will be unrelaible if the range needs to be more than a few m. Do some testing before going too far into it.

author: jacamo
author_rank: Contributor
timestamp: December 28, 2022, 04:59:35 pm
content: Thank you for the reply, I can see how that would work very easily but was possibly hoping that I could do that in the software.I thought I had attached a photo of the connector I was talking about but I guess I managed to somehow miss that. If anyone knows where I could find one or what they are called I would appreciate it.They also have a wifi based version that would probably take care of the limited distance but again I have never had any experience with these.Guess its time to order one and play around with it.
Anyone have experience w/ brokers Abacus, Classic, Rotakorn, One Stop, iodParts? - Page 1
Forum section: electronics / projects

author: IDEngineer
author_rank: Super Contributor
timestamp: December 23, 2020, 01:20:40 am
content: (moved this message from the Manufacturing subforum since it got zero responses, which I interpret as meaning that subforum gets few visitors)Somehow a Bosch part that we use is suddenly out of stock at all authorized distributors and the factory is backordered until March/May/August (depending upon whom you ask). We need several hundred parts to get us to the point where the factory and/or its authorized distributors say they'll have stock again.We and our contract manufacturing house have zero experience dealing with brokers, but I can imagine it's a shady business. In fact our CM house has a policy against buying from brokers at all... we'll have to buy them ourselves and provide them.Does anyone have any experience, good or bad, with the following brokers who claim to have stock?Abacus TechnologiesClassic ComponentsRotakornOne Stop ElectroiodPartsAny guidance will be greatly appreciated. Thanks!EDIT: Yes, we've already considered pin compatible substitutes. We evaluated them when we chose this part, and Bosch's own recommended substitute is anightmareof hideously bad design choices. Plus we really don't have time to redesign the PCB and firmware (plus qualification) before we'll run out of parts, and we'd just get a new revision done when parts will become available again. This part is current production so it's just a short term problem.
Anyone have experience with FCC testing for Qi/Wireless Charging Devices? - Page 1
Forum section: electronics / projects

author: dmc0162
author_rank: Newbie
timestamp: November 05, 2017, 05:15:18 pm
content: Does anybody have any experience with regulatory/FCC testing on wireless charing (Qi) devices? I am looking to get some background info on the process and requirements, and would love to hear any other advice or lessons learned so that I know what to expect when contacting testing labs.Thank you!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 05, 2017, 05:59:37 pm
content: Wouldn't think it's different from any other Part 15 testing.The DUT is set up on a bench, powered from a LISN, and its conducted and radiated emissions are tested. The device should be under normal operation, so you might bring a dummy load to "charge". It might be worthwhile having it undergo the start/negotiation/stop phases repeatedly, in case that generates more noise (and if applicable).Tim
Anyone have good connectors for 'coplanar' edge-to-edge PCB interconnect? - Page 1
Forum section: electronics / projects

author: alanambrose
author_rank: Frequent Contributor
timestamp: January 25, 2018, 06:25:45 pm
content: .... for a mix of fairly low speed signal and power, maybe 10-way? I see these old-style kind of things:https://www.digikey.hu/en/articles/techzone/2014/aug/how-to-specify-connectors-for-led-applicationsAnd these 'EdgeLine CoEdge' would be the kind of shape:http://www.molex.com/pdm_docs/sd/467200011_sd.pdf- but they're 20 Gbps / not available yet / and probably an arm+leg.Alan

author: Howardlong
author_rank: Super Contributor
timestamp: January 25, 2018, 06:36:08 pm
content: What’s “low speed”?

author: alanambrose
author_rank: Frequent Contributor
timestamp: January 25, 2018, 06:40:49 pm
content: Good question, < 25 MHz definitely, probably < 100 KHz in most cases.A.

author: Howardlong
author_rank: Super Contributor
timestamp: January 25, 2018, 06:58:22 pm
content: Assuming it’s digital, normal 0.1 or 0.05” pin headers should be fine assuming the distances are short, and one adjacent ground for each signal pin, less if differential. Not sure of your power requirements though. Maybe I’m misunderstanding something about your application?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 25, 2018, 07:08:24 pm
content: Could always edge mount a header, edge connector or what have you.Headers (right angle style) are great for autoinsert (i.e., without faffing with edge mounting); they come in matching heights, so the boards line up, of course. Not coplanar, but it works well.There's also ribbon cable, not very practical for a very short connection, but it can be nearly coplanar -- when laying flat, either soldered into the board, or against it (I've seen surface mounted ribbon cables, oh they must've been so annoying to the cheap labor that manufactured them..), or with a wire-to-board connector (which can be permanent or pluggable).Tim

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: January 25, 2018, 08:31:07 pm
content: https://www.digikey.co.uk/product-detail/en/avx-corporation/009159010061916/478-8659-ND/4009962Leo

author: alanambrose
author_rank: Frequent Contributor
timestamp: January 26, 2018, 11:52:02 am
content: Ah thanks Leo, looks like exactly what I am looking for.Ta, Alan
Anyone have specs for ENI / Motorola ENI-1B Transistor? - Page 1
Forum section: electronics / projects

author: torinwalker
author_rank: Contributor
timestamp: November 15, 2023, 07:33:58 pm
content: I have an ENI OEM-6 RF Plasma Generator whose driver/preamp DC regulator has failed - on it, an ENI-1B transistor purportedly made custom for ENI by Motorola, who some surmise may be a more common transistor that Motorola "binned" (selected those matching a tighter specification) during manufacturing and relabled for ENI as a custom part.At any rate, if this ENI-1B transistor is based on another common transistor, I would like to know which one so I can replace the defective one.Please and thank you.Torin...
Anyone heard of Northern Radio? looks to be made by National HRO? - Page 1
Forum section: electronics / projects

author: Peithojr
author_rank: Contributor
timestamp: February 08, 2024, 03:24:06 pm
content: I'm looking for more information about Northern Radio, by the looks of the build, looks to be a National HRO rebranded. On the video it says 1936, but was wondering if folks out there has seen more radios like this? I can only assume this radio was used during WWII to communicate to ships and small aircrafts? Anyways, thanks !https://youtu.be/ExkQp3qOlBA
Anyone heard of Simcom SIM800E or SIM800W? - Page 1
Forum section: electronics / projects

author: Tuppe
author_rank: Contributor
timestamp: January 31, 2014, 03:52:42 pm
content: I found couple of odd SIMCOM modules online, but there is very little information available of them. Are these discontinued products? Why doesn't SIMCOM website have any information on these units? Or practically any website for that matter...I was able to find Hardware design manual for 800E, but that's about it.SIM800E and SIM800W:http://www.aliexpress.com/item/New-original-module-SIMCOM-SIM800E-price-advantage/1473960177.htmlhttp://www.aliexpress.com/item/New-original-module-SIMCOM-SIM800W-price-advantage/1473991984.htmlI'm currently using SIM900, but it has wide range of features I don't need to use in my final product(LCD,PWM,ADC,Quad-band etc.), so I decided to change to lower range unit. These SIM800 modules seem to fit well, but I'm curious why there's so little info on them online. Are these region locked? Are these discontinued model left in the inventories that they're selling out?Does anyone know anything about these mysterious modules? Seems to be suspiciously good value, but I don't want to base my design on something this vague part(well, I only plan to make 5-10 units).I know about the new SIM800H, but it has too complicated package type for me.Or do you have better(=cheaper) idea for minimal GSM chip? I basically need to only use RI, TX and RX pins.Thank you!EDIT: SIMCOM emailed that these modules do not work in Europe.
Anyone here a MC34063 guru? - Page 1
Forum section: electronics / projects

author: chimera_786
author_rank: Regular Contributor
timestamp: August 12, 2013, 02:30:03 am
content: Hello !So Ive decided to use a mc34063 to drop 12V to 5V at 0.2A max loading, with a switch freq. around 100kHz. Sounds straight forward and was almost done prototyping it but second guessed myself and wanted to sim it first (just to be sure)I looked around for a model for this device and came across a couple and decided to use one of them. However, after simulation and iteration after iteration, it seems that the model is not showing me the entire picture.Ive attached a folder which contains the actual sim that im generating for my design and it contains the model (and the orginal authors demonstration circuit) as well.From what Im seeing, I need to load my converter significantly to get the a clean SW node voltage, CC in the inductor and the a Vripple of 100mV (or less).If I only load the converter with the load its designed to drive (25ohms on a 5V output rail), my switch node rings and my inductor current has mini peaks (almost like sub.harmonic osc.)So, here's what Im guessing: either the model needs to be fined tweaked or I need to decrease my freq (and I tried that, it really didn't make that big of a diff.) or I just need to deal with it.I went out and bought a car 12V USB charger and guess what?? it had the classic mc34063 buck configuration! so I quickly probed SW nodes, cap charging etc and here's what Ive found: the SW rings (just like in the sim) at no/very light loads and is clean when the converter is loaded.After the sim and the actual probing, I'm beginning to lean towards the fact that the model needs tweaking. But I'm no LTSPICE expert and would like to get an opinion.Any suggestions? Thanks!
Anyone here make their own laminated core transformers? - Page 1
Forum section: electronics / projects

author: cur8xgo
author_rank: Regular Contributor
timestamp: June 14, 2019, 04:11:45 pm
content: Just looking for stories and experiences..I'm planning on making several. Would like to hear about what you've done, especially if you made any fixtures for assembly, varnish dipper, coil winding (bonus points!), made your own bobbins, etc..To kick it off:https://ludens.cl/Electron/trafos/trafos.html

author: imacgreg
author_rank: Contributor
timestamp: June 14, 2019, 09:18:23 pm
content: That's an amazing read, thank you!

author: soldar
author_rank: Super Contributor
timestamp: June 14, 2019, 09:19:52 pm
content: Earlier thread:https://www.eevblog.com/forum/projects/20w-50hz-isolation-transformer/msg2369430/#msg2369430

author: mariush
author_rank: Super Contributor
timestamp: June 14, 2019, 09:43:25 pm
content: It's not worth the effort to buy laminations, wires of wires diameters and so on... you can buy ready made transformers for reasonable prices these days.Also, I'd rather go with toroidal transformers any time of day instead of plain transformers. Less weight to deal with.

author: hydrogen18
author_rank: Contributor
timestamp: June 15, 2019, 12:40:24 am
content: Is the project here to make specialty high voltage transformers?If not, it probably isn't worth your time. If you think it is, you can probably buy a used pole pig.