hybridfree/eevblog-posts huggingface dataset:
Help me identify this connector - Page 1
Forum section: electronics / projects

author: cheeseit
author_rank: Regular Contributor
timestamp: May 03, 2018, 09:40:37 pm
content: I need a couple of connectors of this type, or a cable, if possible. Not sure if it is/was generally available but at least Sony and Kenwood has used it as a com/remote cable between units and I'm pretty sure I've seen it used for something entirely different before.I can't seem to find it so does anyone know what it's called or know where to buy it?

author: djnz
author_rank: Regular Contributor
timestamp: May 04, 2018, 03:29:51 am
content: The 'S' makes me think it could be a Samtec part -https://www.samtec.com/
Help me identify this fiber optic connector? (it's very strange) - Page 1
Forum section: electronics / projects

author: cvanc
author_rank: Frequent Contributor
timestamp: September 11, 2018, 07:22:44 am
content: Yes, it has TWELVE fibers in it. What the heck is this connector called? What would this cable assembly be called? Thanks...

author: hamster_nz
author_rank: Super Contributor
timestamp: September 11, 2018, 08:00:42 am
content: Most likely MPO/MPThttp://www.cablek.com/technical-reference/what-are-mtp---mpo-fiber-cables-

author: LapTop006
author_rank: Unknown
timestamp: September 12, 2018, 04:29:26 am
content: Certainly an MPO *core*, with a special surround. Almost all fibre arrays from 8 to 24 fibres are MPO cores for the optical core (One I used had 192 fibers in an array of MPO cores), even if they sometimes have different physical surrounds.I don't think I've ever seen that style, it's certainly not a version commonly used in network equipement.Can you read the label on the fiber, that's likely helpful.

author: cvanc
author_rank: Frequent Contributor
timestamp: September 12, 2018, 12:27:04 pm
content: Quote from: LapTop006 on September 12, 2018, 04:29:26 amHere ya go... thanks.

author: LapTop006
author_rank: Unknown
timestamp: September 13, 2018, 01:40:17 am
content: I'd actually meant the stuck on label which would likely have an assembly part number, but given they're not a normal fiber manufactuer just Infineon was enough to find what it probably is.It looks like theirPAROLI2 interconnect.
Help me identify this rectangular connector series - Page 1
Forum section: electronics / projects

author: bradcb212
author_rank: Newbie
timestamp: September 27, 2021, 09:42:48 pm
content: I'm looking to modify a device I already own. It has 2 and 3 pin versions of the shrouded header and locking receptacle. Pitch appears to be 2mm.This is a fairly high volume product so I would expect this to be a popular and cheap connector but I'm having trouble tracking it down.

author: Benta
author_rank: Super Contributor
timestamp: September 27, 2021, 09:51:42 pm
content: Your camera is excellent when focusing on the background. Not so much on the connectors.The white nylon makes me think of MOLEX.

author: bradcb212
author_rank: Newbie
timestamp: September 28, 2021, 12:38:56 am
content: Closest thing I've found so far is the JST PA/XA series but I'm not sure they're actually compatible with each other. Maybe this is just a chinese clone/derivative connector.http://www.mattmillman.com/info/crimpconnectors/common-jst-connector-types/
Help me recover! TMS5110AN2L ultimate speech synth controller. - Page 1
Forum section: electronics / projects

author: haxtormoogle
author_rank: Newbie
timestamp: April 06, 2022, 01:40:01 am
content: Recently I became a victim of cyber terrorismand I lost a large chunk of my notes projects, code, schematics. (Positive note: my music production files have been recovered up to 8-3-21 from a very damaged corrupted backups)I am struggling to relax and just need some EE to work on and move forward and recover mentally.This is a project of mine that I have been working on since 2015 and repeatedly was shelfed from other data loss events.The goal: Complete Reverse engineering of the TMS5110AN2L and creation of a midi + usb synth for music creation.Where I stand:Chip is fully decapsulated and historically documented in Mame.https://wtfmoogle.com/?p=4200https://github.com/mamedev/mame/blob/master/src/devices/sound/tms5110r.hxx#L477https://wtfmoogle.com/wp-content/uploads/2015/07/t0280-series-areas-of-interest.pnghttps://wtfmoogle.com/wp-content/uploads/2015/07/0317-44-rotated-enlarged-with-annotated-bits.pngmassive supply of chips along with some unknown roms I was told was for a talking clock that was sold at some point by radio shack. marked RMTTIIC001, cm72007ANLWhat I lost: Years of accumulating Data sheets, pinouts, refence schematics from arcade machines and various devices that used this chip in some form. basic break out dev board designed in eagle that interfaced with an Arduino Mega.Current plan: Teensy Speak & Pwnage board.Stand alone full chip control and operations with all compatible tms5110A chips via serial terminalCustomizable Midi Interface to enable singing sync with notesBoard can be attached to a Classic Speak& spell, Speak& Read, Speak& Math, Speak& Music to turn into full fledged synthesizer.tl/tr everything I've worked on and not published on my website is gone. help me revive this project from the dust with any information you might have and get me out of this mental loop.

author: ogoun
author_rank: Contributor
timestamp: April 07, 2022, 07:26:34 am
content: Hi, sounds interesting.. I dumped all the ti lpc speech roms over a decade ago, and forwarded them to lord nightmare (one of the mame devs). i will try to find the archive with all the dumps.. Somewhere here i also have the orig ti databook on those speech chips and support stuff.. this was also scaned and sent. Iirc, the mame team have conclusively emulated this series of lpc chips..cheers,pete
Help me source Molex 1000570390  - Page 1
Forum section: electronics / projects

author: fx991ex
author_rank: Contributor
timestamp: March 04, 2019, 08:39:49 am
content: I am trying to find a place to buy item nr. 1000570390 from Molex. I cannot find any distributor that has it on stock.I contacted Molex directly and they only sell 4500 ft spools. I need about 10 meters of this cable for a prototype.I found the cable on components-mart and ventrontech although many reviews say that the site is a scam.https://www.components-mart.com/product/Affinity-Medical-Technologies-a-Molex-company/1000570390.htmlhttps://www.ventrontech.com/ee/parts/1000570433/5472338.html

author: electricMN
author_rank: Regular Contributor
timestamp: March 04, 2019, 09:25:46 pm
content: This isn't the 3-conductor you're looking for but you could zip off the conductors you don't need.https://www.mouser.co.uk/ProductDetail/Temp-Flex/100057-0228?qs=%2Fha2pyFaduht6gdbHpJ12vvRadGWIstF%252B3%2FTSIncEenCbBO9XBUIXg%3D%3DHope this helps some.
Help migrateing SPICE model from Psipe to Qspice - Page 1
Forum section: electronics / projects

author: Sniper1
author_rank: Regular Contributor
timestamp: June 25, 2025, 08:15:23 pm
content: Hi,I am tryng to migrate the Pspice model for LM5046 but i cant get it to work.My target is either LTspice or Qspice , preferably the latter since i had more success there.I added the GND pin and converted some switches from Pspice to standard spice but still nothing and i am sort of stuck / out of ideas what and how to change stuff.Since i cant attach .lib files i put it in an achieve.There is the original TII lib, mt migration attempt and a project schematic that should have all passives needed to at least start doing something.And yes i see no oscillation nothing that would indicate the chip is even responding to anything .Also are there any good resources regarding migrating models from one type of spice to another?

author: mtwieg
author_rank: Frequent Contributor
timestamp: June 25, 2025, 09:30:22 pm
content: For LTspice, I don't think there's any need to modify the lib file. Just create a symbol from the subckt, and add to your schematic. I did this and was able to run a sim without any complaints about the model (not sure it actually works though, would have to build a whole power supply around it to find out).

author: Sniper1
author_rank: Regular Contributor
timestamp: June 26, 2025, 05:10:28 pm
content: Quote from: mtwieg on June 25, 2025, 09:30:22 pmWell i did that in Qspice and it didnt error out but it did like nothing that is why i started this thread.I am not that surprised that it didnt error out in LTspice.I can also try the surrounding circuit in LTspice.
Help - Monitoring a NTC thermistor - Page 1
Forum section: electronics / projects

author: Hast
author_rank: Newbie
timestamp: November 14, 2019, 01:46:47 pm
content: HiSo I am doing a battery powered (Li-Po) product that is going to be medical device classified.Medical products must be “single fault safe”.I will us a charging circuit from TI, BQ24040 to charge the Li-Po.It monitors the temperature via a NTC thermistor on the TS pin. “The TS feature is implemented using an internal 50μA current source to bias the thermistor.”The risk I see is that the NTC breaks and is open. If it is open/floating the BQ24040 enters a “Termination and Timer Disable Mode”.This is not by itself any risk unless the temperature is between 0-10 degrees C, between 0-10 degrees C the Li-Po shall be charged with half the normal charging current. This is handled by the charging IC.So to solve this I am thinking that I need to monitor the NTC resistor somehow and if it breaks then I will prevent charging and signal the MCU that there is a HW fault.My first thought was to use a comparator over a shunt resistor after the NTC but then I realized that this do not solve the problem as then the test house will only say that what happened if the shunt resistor breaks and then I am back where I started.I then saw in a datasheet for a current sensing IC, INA285, that I could use two in a “current differencing” circuit (see attached pic).This could probably work if the shunt resistors used do not introduce a to big of a fault when detecting if it is to warm/hot (the NTC resistance go down when it gets hot). But also it increases the BOM-cost.So now I am looking for if there is another way to monitor if the NTC thermistor is broken or not?Another constraint is that it cannot be the MCU (software) that do any of the safety monitoring as if the software has anything to do with safety then the software must be classed as class B/C and I do not want that. The software must be class A.Any good ideas?Best regardsAndreas

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 14, 2019, 01:52:48 pm
content: Just measure the voltage across the thermistor. It is its own shunt resistor, after all.Tim
Help? Need ideas for 555 timer. - Page 1
Forum section: electronics / projects

author: PhynixViking
author_rank: Regular Contributor
timestamp: December 18, 2012, 08:16:15 pm
content: Hello!OK! So I wanted to do a video on the555 timerand some "cool things" you can do with it.Anyone have some ideas/schematics to share? It would be greatly appreciated!Thanks! ^__^PS:Been posting a lot of this forum, I'm kinda new to it, not finding many people "my age" (or thus other that I know... LOL) into these kind of things so hope I'm not posting too much, LOLOTHER NOTES:* I already have a PWM, a "LED Flasher", and a "555 Sound Piano."* Ideally I'd like circuits that use JUST the 555 timer as the only IC (bunch of transistors of course ok) or only "1" other IC chip. Unless its something really fun/interesting that HAS to have a couple/few other IC's then ok w/e post/share! ^_^* I'd like to make this video for beginners some fun projects and nothing too too complex.

author: Thor-Arne
author_rank: Unknown
timestamp: December 18, 2012, 11:29:15 pm
content: Perhaps this can be of interest.It's a variable frequency pest repeller, it uses two 555's one to generate the frequency and one to sweep it.

author: johnboxall
author_rank: Unknown
timestamp: December 19, 2012, 04:26:33 am
content: http://www.talkingelectronics.com/projects/50%20-%20555%20Circuits/50%20-%20555%20Circuits.html

author: PhynixViking
author_rank: Regular Contributor
timestamp: December 20, 2012, 01:02:56 am
content: Thor-Arne: Using 2x 555's.... nice! I like it! ^__^tronixstuff: AH! Nice, thanks for the link! ^_^

author: G7PSK
author_rank: Super Contributor
timestamp: December 20, 2012, 10:05:42 pm
content: Here are some circuits that I have made many years ago, not my design they are from a book by RM Marston dating from the 1970's the Star Trek red alert is very good when I built it I added an amplifier and a voltage regulator and ran the 555's at 9 volts and the amp stage at 12 volts Driving a PA horn and fitted it to a car as an alarm.

author: PhynixViking
author_rank: Regular Contributor
timestamp: December 21, 2012, 03:31:22 pm
content: G7PSK- Very fun! Thanks for sharing it! ^__^I didn't see but... might be fun to add a 3rd 555 to that "star trek red alert" circuit and set it up with some flashing red LED's LOL (or... wait... I guess you can probably do that without a 3rd 555 and... use a transistor off of the speaker feed? hm... )

author: MikeK
author_rank: Super Contributor
timestamp: December 22, 2012, 02:17:02 am
content: Forrest Mims' 555 timer book:http://ebookbrowse.com/vol01-01-forrest-mims-555-timer-circuits-pdf-d214894274

author: dodad_guy
author_rank: Contributor
timestamp: September 09, 2013, 08:11:43 pm
content: This post is kind of old. Are you still interested in some new and novel circuits?

author: PA4TIM
author_rank: Super Contributor
timestamp: September 09, 2013, 09:08:25 pm
content: http://www.vk2zay.net/article/256I like this one very much. It is still on my to do list just because it looks like fun to build.
Help, need info ITT OCXO 10 MHz - Page 1
Forum section: electronics / projects

author: blackdog
author_rank: Frequent Contributor
timestamp: April 03, 2012, 09:31:21 am
content: I need some information from an ITT OCXO 10 MHz.See the photos, i cant find any :-(http://www.bramskey.nl/ITT-OCXO-01.jpghttp://www.bramskey.nl/ITT-OCXO-02.jpgThanks!Blackdog/Bram

author: jimmc
author_rank: Frequent Contributor
timestamp: April 05, 2012, 10:01:23 pm
content: I've dug in my files and come up with the two pages below which may help a littleSpec of an equipment using this device wasStabilityWith temperature 0 to 50oC <1.10-7With time <2. 10-8/day<1. 10-6/yearJim

author: jimmc
author_rank: Frequent Contributor
timestamp: April 07, 2012, 11:14:23 am
content: More digging in the depths of my archives and .... a full data sheet from 1980!Note the output is open collector.Jim

author: blackdog
author_rank: Frequent Contributor
timestamp: June 01, 2012, 03:07:45 pm
content: Hi jimmcThank You!Sorry, a little late ;-)Kind regarts,Bram
Help need name for 8 pin DIP to ribbon connector and where to buy. - Page 1
Forum section: electronics / projects

author: Kjelt
author_rank: Super Contributor
timestamp: September 09, 2017, 12:41:33 pm
content: Hi I am busy repairing a power supply and accidentilly ripped of an hidden ribbon cable from its dip connector.Knowing and trying to solder a ribbon cable to a dip socket and getting annoyed with the thermal fragile isolation of ribbon cable,I am desperate trying to find quick resources like Farnell, digikey, tme where to order these connectors, but every firm seems to call them differently:- 8 pin dip to ribbon cable connector- 8 pin dual row dip plug- 8 pin dip connector.However Farnell doesn't recognize any of these names so does anybody know the correct term for this connector and a normal fast source for them?(I want to continue with the repair so want the fast track firms not some obscure dump or China where I have to wait three weeks or so)or perhaps a quick alternative (is there something like teflon ribbon cable ?)Thanks in advance for any help

author: Andy Watson
author_rank: Super Contributor
timestamp: September 09, 2017, 01:58:06 pm
content: I would call them IDC transition connectors/headers.https://tdigroup.co.uk/product/idc-transition-connectors-for-dil-sockets/Good luck finding an 8-way and a supplier.Edit: RS - perhaps ?http://uk.rs-online.com/web/p/idc-connectors/6425102/

author: Kjelt
author_rank: Super Contributor
timestamp: September 09, 2017, 03:50:27 pm
content: Thanks Andy and again another name for this connectorI do not have an RS account but lets see if one of my contacts can order it.In the meanwhile I "crafted" a temporary workaround.It will not fit in the final assembly but at least I can continue with the repair measurements.

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: September 10, 2017, 07:15:13 am
content: I think this is it:https://www.digikey.ca/product-detail/en/te-connectivity-amp-connectors/746613-1/746613-1-ND/294860$3.25 in stock at Digi-Key
help, need to identify a connector - Page 1
Forum section: electronics / projects

author: sven532
author_rank: Newbie
timestamp: May 30, 2025, 07:51:45 am
content: I was asked to identify the blue connector in the picture.It has 50 pins.Help is kindly apricated.

author: Phaseseeker
author_rank: Regular Contributor
timestamp: May 30, 2025, 07:55:01 am
content: Can you post a picture of the bottom side too?

author: sven532
author_rank: Newbie
timestamp: May 30, 2025, 08:08:30 am
content: I only have the PCB, maybe this helps.(ruler in cm)

author: tooki
author_rank: Super Contributor
timestamp: May 30, 2025, 08:09:21 am
content: Quote from: sven532 on May 30, 2025, 07:51:45 amI suspect it’s a CWR-142-50-xxxx or similarhttps://www.cwind.com/pcb-connectors-selector-guideSee also:https://www.digikey.de/short/8qb0tvr9(Product Index > Connectors, Interconnects > Rectangular Connector > Board In, Direct Wire to Board, with some filters then applied)

author: sven532
author_rank: Newbie
timestamp: May 30, 2025, 08:14:33 am
content: Thank you for your suggestion, I already contacted them and their replay was:"We can tell it is not a CW product."

author: tooki
author_rank: Super Contributor
timestamp: May 30, 2025, 08:25:54 am
content: Quote from: sven532 on May 30, 2025, 08:14:33 amWho is “them”?I see you added a picture while I was writing that reply. Ok, so that must be fine-pitch ribbon cable. Look at the System 50 series in the search results (ignore the DigiKey metadata; it’s wrong, and I’ve reported the error).

author: sven532
author_rank: Newbie
timestamp: May 30, 2025, 08:31:05 am
content: Thank you for your time!"Them" is CW Industries as in Electroswitch Electronic Products engineering support
Help needed calculating trace impedance. - Page 1
Forum section: electronics / projects

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 13, 2021, 08:21:33 am
content: I'm currently poking the bear and designing a replacement Peak-to-Peak detector circuit for my Tektronix SG503 to improve performance and have a replacement design for the unobtanium hybrid module.I am basing my design on the work of John Bennet over at the Tektronix groups.io, but with a few of my own tweaks.https://groups.io/g/TekScopes/files/SG503_P2P_Substitute.pdfI plan to use Rogers 4003C PCB material, and the trace from the 50ohm resistor (R225A) to the output pin to the 50ohm Wideband Attenuator was pretty straightforward to calculate for 50 ohms, but the input trace from the Low Pass Filter I'm not sure about... (See the schematic below for details)First of all, I'm not sure on the required impedance (Does it even matter?) and then how to calculate it..The ground plane on the hybrid module is cut away under the input trace, same on the PCB it mounts to, and only the lower inner layer has a complete ground plane underneath.Also, the original input trace is 24mil (0.61mm) on a 1.25mm substrate.Here is the stackup as I measured it (with the new PCB specs for the hybrid):--------------------0.035mm 1oz copper--------------------0.508mm Rogers 4003C--------------------0.035mm 1oz copper (Cut away under the input trace)----------------------------------------0.07mm 2oz copper (Cut away under parts of hybrid above)--------------------0.6mm PCB--------------------Bottom internal layer ground plane (complete fill)--------------------Rest of PCB below hereI have included a picture of the schematic below with the hybrid highlighted in red and the input trace in question in blue.Also, a few photos of the hybrid and PCB.If anyone can shed some light on this, it would be greatly appreciated.

author: S. Petrukhin
author_rank: Super Contributor
timestamp: February 13, 2021, 06:10:57 pm
content: https://saturnpcb.com/pcb_toolkit/

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 14, 2021, 05:23:16 am
content: I had a look at that calculator, but I can't see where I can make calculations on two different substrates stacked one on top of the other?
help needed ,charge sensitive amplifier design - Page 1
Forum section: electronics / projects

author: threshold
author_rank: Newbie
timestamp: October 15, 2014, 10:16:25 am
content: hello, i am designing radiation measurement readout front-end electronics, as part of my project ,in very 1st step to understand working of CSPA(charge amplifier) i had done little experiment by connecting photodiode with opa657 .here i have used general purpose ir photodiode and Rf=147k ohm, Cf= 1pf. in feedback with opa657. i am giving 5v pulse train having 50ns pulse width and 2Mhz repetition rate to IR LED which is placed very near to IR photodiode which simulated as radiation source and photodiode will work as detector. now problem is as per theory output of cspa have long decaying pulse having time constant equals to Rf.Cf , but in my experiment cspa output is same like input pulse having 70ns width and 350mV peak amplitude .can you please tell where i am making mistake? i don't understand whats wrong with this circuit.
Help needed: Connecting Keithley 4200A to Auto Multiplexer for channel switching - Page 1
Forum section: electronics / projects

author: valium3012
author_rank: Newbie
timestamp: June 17, 2025, 03:25:56 am
content: Hi everyone,first post here so please bear with me! I'm a super beginner in this stuff but I've been tasked to connect a Keithley 4200A-SCS to a multiplexer that can switch automatically. The automatic multiplexer is custom made and has 6 electrode ports. I need to program the Keithley to switch between these ports automatically using a USB or serial cable. How can I do this on the Keithley without using a PC?Please let me know if there's anything else I need to add and I would really appreciate any help!!Thank you!
Help needed finding datasheet for THS700 series scope replacement LCD's - Page 1
Forum section: electronics / projects

author: TERRA Operative
author_rank: Super Contributor
timestamp: May 04, 2023, 04:47:56 pm
content: Hi,I'm currently fitting a couple replacement LCD panels to some THS720 scopes and I'm trying to get the contrast control working.It's an adventure with different voltage requirements between the original panels and the new 'compatible' ones etc, but I'm trying to track down decent datasheets for the LCD panels so I can figure out the best way to get things connected.The original panel is an LM32P10 and the replacement panels are PG320240FRF-YNN-H-Y4, but I think a data sheet for a PG320240FRF-YNN would work well enough.Even a datasheet for the driver chip BU6132F on the new panels would be a big help too.Does anyone any of have these data sheets they can send me so I can get these panel swaps sorted out?

author: rvalente
author_rank: Frequent Contributor
timestamp: May 05, 2023, 05:54:54 pm
content: Are THS and TDS similar architectures? Maybe looking for the LCD for TDS210/220 could give you some hint.I've tried to locate this datasheet in the past while trying to fix the polarizer issue on my 720P, I was unable to find any useful information

author: amyk
author_rank: Super Contributor
timestamp: May 06, 2023, 04:10:05 am
content: Quote from: TERRA Operative on May 04, 2023, 04:47:56 pmAre you sure? LM32P10 is a controllerless display while PG320240FRF-* appears to be a type with (various different) controller IC/framebuffer included.

author: TERRA Operative
author_rank: Super Contributor
timestamp: May 06, 2023, 04:27:41 am
content: Here's a photo of the two panels, original at the top, new replacement at the bottom.I also have a third panel that looks electrically identical to the bottom panel.

author: TERRA Operative
author_rank: Super Contributor
timestamp: May 06, 2023, 05:09:44 am
content: Quote from: rvalente on May 05, 2023, 05:54:54 pmYeah, the best I can find is a 1-page datasheet for the LM32P10. I think the TDS200 series use the same basic screen type just a slightly larger panel.
Help needed identifying a diode BDT C144 - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: July 21, 2016, 05:46:27 pm
content: Hi all.Need some help discovering type and values of (what I assume to be) a DO214 diode which was pulled from a Chauvin Arnoux C.A 6115 installation tester.The manufacturer is ST MicroComponents and although various emails have been sent to various departments and ST suppliers, no replies have been received, so perhaps someone here can help?Only markings on the top areBDTandC144Underneath is markedMRCThe unit has a mains input as well as a 7.2v NiMH battery pack and this diode is/was located just where the 7.2v battery pack connects to the main board.

author: whitevamp
author_rank: Regular Contributor
timestamp: July 21, 2016, 07:46:53 pm
content: if googlefu isn't failing me it should be this one.http://pdf1.alldatasheet.com/datasheet-pdf/view/504860/TSC/DTC144.htmlNPN Small Signal Transistor Small Signal Diode

author: RobK_NL
author_rank: Frequent Contributor
timestamp: July 21, 2016, 08:59:47 pm
content: Quote from: whitevamp on July 21, 2016, 07:46:53 pmIt is. Very much so even. That's a three pin device you linked to.From the coding I would expect it to be a (probably bidirectional, as I can see no polarity band) transzorb from the SMBJ family. Problem is, the ST datasheet (http://www.st.com/content/ccc/resource/technical/document/datasheet/19/78/91/39/07/cd/40/65/CD00001366.pdf/files/CD00001366.pdf/_jcr_content/translations/en.CD00001366.pdf) has no device with "BDT" marking.Found it! It's an SM15T12CA

author: Unknown
author_rank: Unknown
timestamp: July 22, 2016, 12:37:04 am
content: Hi RobK,Thank you so much...... are you sure it is the correct version? Edit... actually I can see it is too....Shame ST couldn't be so helpful

author: Unknown
author_rank: Unknown
timestamp: July 22, 2016, 12:33:21 pm
content: So,it appears that no-one has these in Brazil and that the post to Brazil is $35 USD for a 75¢ component...Any idea if there is something compatible, which is more common? Even through-hole perhaps?

author: bktemp
author_rank: Super Contributor
timestamp: July 22, 2016, 01:36:23 pm
content: Almost any bidirectional 12V 1500W TVS diode should be compatible. But compare the datasheets: Some manufacturers use the breakdown voltage others the standoff voltage for the part number:same package: SMCJ10CA, 1.5SMC12CAthrough hole: 1.5KE12CA
Help needed identifying an RF connector to an old ADVANTEST - Page 1
Forum section: electronics / projects

author: gissiken
author_rank: Newbie
timestamp: December 28, 2018, 04:59:48 pm
content: I have an old ADVANTEST R3272 Spectrum Analyzer 9KHZ to 26.5GHZ that I am attempting to rescue.The connector in the front is something I cannot recognize.Can anyone tell me what this is?

author: coppercone2
author_rank: Super Contributor
timestamp: December 28, 2018, 05:14:01 pm
content: are you sure thats a real connector not a slot machined out for some reason (in house test)?normally APC-7 right? i am not sure but I think the side cuts look kinda shitty for 27.5 GHz.

author: KaneTW
author_rank: Frequent Contributor
timestamp: December 28, 2018, 05:29:35 pm
content: Doesn't look like any connector I recognize.https://www.advantest.com/documents/11348/146687/pdf_mn_ER3272_OPERATING_MANUAL.pdfspecifies a N-type, so this is likely a custom mod.

author: Twoflower
author_rank: Frequent Contributor
timestamp: December 28, 2018, 05:45:54 pm
content: Looking around that type of connector appears several time. So that's not a custom mod. But no clue here either.

author: gissiken
author_rank: Newbie
timestamp: December 28, 2018, 05:48:07 pm
content: Thanks for Reply! I don't know anything about this connector. Have order an APC-7 but I don’t know. Waiting also on a Planar Crown connector. Started to look into changing the whole connector to N-Type. Recognize the back end of the connector?PS! found later on that it was 3,5 mm air dialectic, for those who are wondering. good for 33 GHz.

author: Twoflower
author_rank: Frequent Contributor
timestamp: December 28, 2018, 06:20:12 pm
content: I think I found it:https://www.rohde-schwarz.com/us/applications/interchangeable-port-connector-system-test-port-adapter-system-white-paper_230854-15413.htmlThat's probably a starting point for you to look for adapters that matches your requirements.

author: DaJMasta
author_rank: Super Contributor
timestamp: December 28, 2018, 06:31:50 pm
content: That does look like it, added to the fact that R&S and Advantest collaborated on a couple of products including SAs in the past.

author: gissiken
author_rank: Newbie
timestamp: December 28, 2018, 06:35:04 pm
content: Wow Extremely impressed by your effort, and this forum!!!Thank you so much!!!

author: TheSteve
author_rank: Unknown
timestamp: December 29, 2018, 06:40:56 pm
content: Glad you found your connector. Just as an FYI the APC7 connector is limited to 18 GHz.
Help needed: Installing NI GPIB-PCI drivers and NI-VISA in Linux -Ubuntu or SUSE - Page 1
Forum section: electronics / projects

author: croma641
author_rank: Regular Contributor
timestamp: June 02, 2025, 12:04:47 am
content: Hi everyone,I'm looking for some assistance with correctly installing the drivers for a National Instruments GPIB-PCI card and the associated NI-VISA drivers on my system.My main problem now is getting NI-VISA to correctly identify and allow communication through the GPIB card, even though the lower-level NI-488.2 driver appears to be functional.Thanks in advanceP.S.: I'd also be perfectly happy with a solution for Debian if that's more straightforward.
Help Needed: NEC D7225G  - Page 1
Forum section: electronics / projects

author: jt154
author_rank: Newbie
timestamp: November 11, 2018, 02:23:30 pm
content: Hey guys,I got a board from an old machine that has 5x NEC D7225G connected to 5x 6-character 14 segment LCDs, the board is damaged and has quite a lot of components missing.I was wondering if anyone would know how I could possibly hook up the D7225G to an arduino to drive a single LCD. Tried to read the datasheet but I really have no idea where I should start.Will be grateful for any form of helpThank youPhotos:https://www.dropbox.com/sh/1r7yenmil3w9d3d/AAA_aZl_Bn2M3caVtNMMC_JXa?dl=0

author: pelule
author_rank: Frequent Contributor
timestamp: November 11, 2018, 06:06:30 pm
content: The uPD7225G is a standard LCD controller/driver. The interface is a synchronouse serial 8 bit port. Thus you can control it with any MCU/CPU which has 3 ports or SCI.See more details:https://www.lcd-module.de/eng/pdf/zubehoer/upd7225.pdf/PeLuLe
Help Needed || Need USB voltage without soldering - Page 1
Forum section: electronics / projects

author: diptika11
author_rank: Newbie
timestamp: February 16, 2024, 06:09:22 am
content: I am trying to connect a pcb (for a device) inside my laptop. My this device need a 5V of voltage which I am planning to give using USB port. The problem is If I solder the GND , 5 V of my PCB to the USB's GND and 5V pin, my Warranty gets void...how to do this?Are there any connectors/ clamps possible?

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: February 16, 2024, 08:44:25 am
content: Quote from: diptika11 on February 16, 2024, 06:09:22 amPutting anythinginside your laptopwill already void the warranty, unless you plan to put it in an empty space that is accessible from the outside, like an HDD slot.Quote from: diptika11 on February 16, 2024, 06:09:22 amNothing that doesn't have a high risk of making a short circuit with an adjacent pin.Why don't you tell us what you are trying toachieve, and not your intendedsolution. See:https://en.wikipedia.org/wiki/XY_problem

author: zilp
author_rank: Frequent Contributor
timestamp: February 16, 2024, 09:47:58 pm
content: Quote from: BreakingOhmsLaw on February 16, 2024, 08:44:25 amWhile that is commonly believed, it is mostly a myth. I mean, obviously, different rules apply in different jurisdictions, but generally, if it isyourlaptop, it isyourlaptop, and as such, it is exclusively your decision what you do with it and the seller can not put arbitrary restrictions on that, and that includes that they can not disclaim liability for defects in a product just because you used the product in a way that they don't approve of.Obviously, something different can apply for voluntary warranties (i.e., in Germany, Garantie as opposed to Gewährleistung/Sachmangelhaftung).
solved - PAL term optimization - what is wrong here? - Page 1
Forum section: electronics / projects

author: pelule
author_rank: Frequent Contributor
timestamp: December 21, 2017, 11:20:01 am
content: I need help in checking my term conversions - I am begining to believe I am stupid or blind.I want to create backup files of my Datron PALs, 1x PAL20L8 and 4x PALs 10L8,all just simple combinatoric terms, no output feedback, no registers or other fancy stuff.https://www.eevblog.com/forum/repair/datron-cpu-board-pal-data-(1271-1281-)/msg1346121/#msg1346121In principle I used a similar process as described here (with my own HW and SW):http://www.vcfed.org/forum/entry.php?315-Cloning-a-PAL-HAL-%28Part-2%29&goto=prev)1) I applied all possible input combination (10 @ 10L8 => 1024 terms, 14 @ 20L8 => 16384 terms) and recorded the related outputs (=8) in a log file, a simple PLD file and in a CSV file to allow an easy comparison of data with another PAL readout.2) The simple PLD output file was compiled using WinCUPL to get optimized terms and to create a JEDEC file in case of no errors.As expected, the compiler messaged some "too much term" because of too many OR expressions for that GAL types.3) I optimized that "problem OR terms" into AND terms using De Morgans rules (+ = OR, & = AND, ! = NOT)!E+!D+!C+!B+!A == !(E & D & C & B & A)4) WinCUPL now compiled without error and generated the JEDEC files, which I programmed into some GALs(GAL16V8A for the 10L8, GAL20V8A for the 20L8)5) To verify the correctness I "readout" the "new" GALs into a new CSV file (to compare ORG and NEW).That worked 3 times (1x 20L8 and 2x 10L8) without any problem - the new data is the same as the original.But for the two remaining 10L8 the result does not match.To check, I changed my recording program to output an additional file useable as input for Minilog (a term optimizer).As expected the optimized terms fit to the by WinCUPL generated.Now I am complete stocked - where I did the error (I assume my "term" conversion is incorrect, but I don't see the problem)Anybody out there, willing to cross-check my "conversion"?I have attached the dedicated files for one of the problems.The extension "PLD" is not allowed for attachments here, so I renamed the files to "*_PLD.TXT":The PLD file - showing the original terms in comments & the "converted" terms (the final file succesful compiled to JEDEC):= 161_10L8_PLD.txt == 161_10L8.PLDThe original PLD file, generated by the readout program:= 161_10L8 _PLD.txt == 161_10L8 .PLDThe by WinCUPL generated DOC file during the compilation of "161_10L8 .PLD" (with optimized terms):= 161_10L8.txtAny Tip or help is highly welcome./PeLuLeUpdate: 25-DEC-2017 - seems to be a software error. Did the manual decoding and got correct reuslt, but different to above./PuLuLe
Help Needed: Simple LM386 Audio Amplifier with Band-Pass Filter (Student Project - Page 1
Forum section: electronics / projects

author: Zhe
author_rank: Newbie
timestamp: May 25, 2025, 09:02:47 am
content: Hi everyone,I'm currently working on a student assignment for my Analogue Electronics course. The task is to design and simulate a simple multi-stage **audio amplifier** using **LM386** to drive an 8Ω speaker, with specific band-pass filtering.Here are the key specifications I need to meet:- Power supply: **5V**- Load: **8Ω speaker**- AC-coupled input and output- **Gain: 20 dB ±2 dB**- Frequency passband: **150 Hz – 20 kHz**- Attenuation outside the passband- **Lower cutoff: 150 Hz ±10 Hz**, **Upper cutoff: 20 kHz ±1 kHz**- Adjustable gain and volume- Input impedance > 10kΩI've built a basic circuit using LM386 and added a simple passive RC high-pass and low-pass filter before the input. I'm using LTSpice to simulate.My questionsIs there a better way to tune the filter response more precisely while keeping the circuit simple?Here's my current schematic (see image below). Any feedback or suggestions for improvement are greatly appreciated!Thanks a lot 🙏

author: Solder_Junkie
author_rank: Frequent Contributor
timestamp: May 25, 2025, 11:31:11 am
content: Active high/low pass filtering produces much nicer response curves, see this example of a dual (switchable) band pass filter for a communications receiver:https://www.qsl.net/g4aon/g4aon_cwf/Texas Instruments have an interactive design tool that will help you with an active filter:https://webench.ti.com/filter-design-tool/filter-typeSJ

author: mikerj
author_rank: Super Contributor
timestamp: May 25, 2025, 02:05:40 pm
content: A few points:1) The response of your design shows a very small passband (-3dB) of approximately 50Hz to 500Hz, well outside the specification you have given.2) The LM386 has a default gain of 20x (26dB) and you have increased the gain even further by connecting the G1 and G8 pins, then you have added a potential divider on the input to reduce the signal. Even if you achieve the correct gain (which you have not) this is not the right way to do things as in practice this will degrade the noise performance. The gain on the LM386 can be reduced (within stability limits) by connecting G1 to the output via a suitable resistor. The 500 ohm resistor will set the gain to around 35dB, and the input divider will reduce this by 3dB. You are seeing a maximum gain close to 20 dB because your passband is so small you never reach this value.3) What is your intended purpose of R6/C3? This kind of network is often added to power amplifier outputs to cancel out the inductive component of a loudspeaker's impedance which can help improve stability. However this would typically a resistor value around 10 ohms. A value of 1k here isn't going to do anything useful.
Help needed to ID IC - Page 1
Forum section: electronics / projects

author: HalFoster
author_rank: Frequent Contributor
timestamp: November 29, 2023, 06:14:34 pm
content: I have quite a few of these from an auction haul a while back but have been unable to find out anything about them. I'm assuming they have a custom part number but, if so, it's not one I can find anything on.Thank you for any help on this!HalBTW: The weird texture is an artifact of the picture - they are smooth in actuality.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: November 29, 2023, 08:39:19 pm
content: Certainly ST but probably custom marked. Might try decapping one and looking at the die.

author: HalFoster
author_rank: Frequent Contributor
timestamp: November 29, 2023, 11:05:16 pm
content: Best I could do... complex die and this is the only numbering i could see.

author: HalFoster
author_rank: Frequent Contributor
timestamp: November 29, 2023, 11:05:50 pm
content: Close up 1

author: HalFoster
author_rank: Frequent Contributor
timestamp: November 29, 2023, 11:07:40 pm
content: Close up 2
HELP NEEDED WITH CHEAP 1X1M 3D PRINTER - Page 1
Forum section: electronics / projects

author: rickey1990
author_rank: Regular Contributor
timestamp: July 20, 2017, 05:09:44 pm
content: Hi guy's, Recently i have been talking with a friend of mine in Pakistan. and we where throwing around a few ideas about how to make a large 3d printer for people who are on a tight budget. iv looked around and i have a few idea's,the design is based onhttps://www.thingiverse.com/make:172500which is a modified version of a 3d printed cnc machine, iv dug around for other files to try to improve on the design however. iv costed it at under £200The printer will consist of 2 Y & 2 X axis motors, 1 Z axis motors and Twin extrudes needing two motors. the board for just the cnc is a RAMP 1.4, You can pick them up for about £3/£4, Stepper motor drivers slot into this board, about 60 pence each. The board fits 5 of these drivers. However i need 7 due to opposing y and x axis's.Heres a example of the RAMP 1.4http://reprap.org/mediawiki/images/thumb/6/6d/Rampswire14.svg/500px-Rampswire14.svg.pngMy idea was to stack two driver boards together, master slaving them. soldering the inputs together and separating the outputs from both boards. I would also be sourcing motor power for the slave from another + - on the board. on the slave the A1 and A2 will be swapped to allow for the opposing motors to travel in the same direction.I am wondering if anyone has any recommendations or help full advice on making 3d printers.Kind regardsRick.

author: Rerouter
author_rank: Super Contributor
timestamp: July 22, 2017, 01:20:01 am
content: be aware that most 3d printers unless you go for a crazy large nozzle have a very long print time, for something that takes up even 50% of the volume of your build area you would be talking days of print time for a 0.5mm nozzle
Help needed with IC substitution problems...... - Page 1
Forum section: electronics / projects

author: TERRA Operative
author_rank: Super Contributor
timestamp: November 23, 2019, 08:04:56 am
content: I'm currently building a DC Bias Option board for my HP 4276A LCZ meter and I am having a little trouble with substituting the old, obsolete and expensive LF13331D Analogue Switch with an in production (and substantially cheaper) TC4066BP Analogue Switch.I'm sure there's something basic that I am missing here, but I've come to a blank trying to get this to work.When I made this circuit with the LF13331, it worked perfectly but with the same circuit adjusted to use the TC4066BP, it's just not working..Basically, every time I plug the TC4066BP on, it pulls the 6.3V rail right down, even if I leave the control pins disconnected.I've included the original and new schematics below, along with datasheets of both parts. If someone smarter than me can take a look and tell me what I'm doing wrong, that would be greatly appreciated.The first attachment is my revised schematic, the second is the original HP schematic.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: November 23, 2019, 08:23:13 am
content: Hi,I can tell you what is wrong. It may take a little while to come up with a solution.The original part LF13331 was powered from +/-12VThe TC4066 is powered from +12V and ground.The TC4066 is limited to 20V max operation.The switch pins have to be inside the rails for the switch to work.In your design you are shorting the 6V3 rail to ground through substrate diodes in the TC4066.Regards,Jay_Diddy_B

author: oPossum
author_rank: Super Contributor
timestamp: November 23, 2019, 08:34:11 am
content: DG412 may work as a substitute for the LF13331.https://www.vishay.com/docs/70050/dg411.pdf

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: November 23, 2019, 08:38:32 am
content: Hi,I was going to suggest ADG444. Similar to oPossum's suggestion.Power with +/-12V and 5V on VlogicJay_Diddy_B

author: TERRA Operative
author_rank: Super Contributor
timestamp: November 23, 2019, 08:45:35 am
content: Aaahh, I knew the devil was in the details somewhere....Thanks for the info, I'll take a look at those suggested substitutions and see what ones I can get easily here.

author: German_EE
author_rank: Super Contributor
timestamp: November 23, 2019, 08:47:04 am
content: Why not power the 4066 with +/- 6.3V from either side of the zero adjust control?

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: November 23, 2019, 08:54:16 am
content: Quote from: German_EE on November 23, 2019, 08:47:04 amGood idea, but...The control pins are driven by 0-5V logic signalsThe thresholds on the TC4066B are with respect to VSS. You would have VSS at -6.3V.You would have to level shift the control inputs.Other switches like the ADG and DG family have the level shifter built in.Jay_Diddy_B
Help needed with Russian translation, to figure out this circuit - Page 1
Forum section: electronics / projects

author: DDT
author_rank: Contributor
timestamp: March 19, 2017, 01:25:22 pm
content: This schematic shows a security device, apparently intended for military uses. The inputs are 3 contacts on furthest left side denoted ?? (pf), ?? (LF) and the middle one being common ground(?). It mentioned they are for break wire. The outputs are sound emitter via a simple transformer oscillator , light and optionally a pyrotechnics sound maker. I am just interested to know how the circuit works. It says start by pushing switch B1 and B2, but then this action will short circuit the battery B ( if I am correct). This doesn't make sense. If you know russian, here is the circuit and the link for the description. Just ignore most of the text and get to the section on how the device works. Greatly appreciated.http://www.findpatent.ru/patent/221/2215974.html

author: Prehistoricman
author_rank: Regular Contributor
timestamp: March 19, 2017, 03:57:57 pm
content: Top left says "pf"Bottom left says "lf"Top right says "eb"Middle one near the speaker says "tlf"As to what these mean, I'm not sure, sorry.

author: JimRemington
author_rank: Regular Contributor
timestamp: March 19, 2017, 04:06:39 pm
content: It is hardly a professional design. You would probably be better off designing your own circuit to do whatever you want.

author: DDT
author_rank: Contributor
timestamp: March 19, 2017, 04:15:58 pm
content: Quote from: Prehistoricman on March 19, 2017, 03:57:57 pmLf anf Pf are the points where break wire is attached at one ends and the middle point is the common point for both wires, which upon breakage activates the device via the first transistor VT1Quote from: JimRemington on March 19, 2017, 04:06:39 pmI have several good designs including my own, but I like to explore other designs as well.

author: wraper
author_rank: Unknown
timestamp: March 19, 2017, 04:21:42 pm
content: Quote from: JimRemington on March 19, 2017, 04:06:39 pmI don't think it's unprofessional. It's very old design with pnp transistors, which means designed for germanium BJTs. Transformer is used for lower transistor count.
Help Needed With - The OPB720B-30VZ Laser - Page 1
Forum section: electronics / projects

author: MichaelCarr
author_rank: Newbie
timestamp: July 05, 2015, 12:31:14 pm
content: Hi everybody!I'm new to the forum, and was wondering if anybody here had any experience with the OPB720B-30VZ Laser, or anything similar.I've had a look through the data sheet found athttp://optekinc.com/datasheets/opb720a-06z.pdfThe "Applications" part of the sheet looks promising, as I want to be able to use it for automation in similar ways listed.E.g. If the beam is broken, etc, then it turns an LED on or something?I'm mainly looking for use with the Arduino Uno Micro-controller, but its not necessary that it has to be used.If anyone can help me out with some easy starter projects for it, I'd be eternally gratefulThanks,MichaelCarr

author: LukeW
author_rank: Frequent Contributor
timestamp: July 05, 2015, 05:09:19 pm
content: It's just got Vcc and ground and an open-collector output. The red wire is Vcc, ground is black and the output is white.If you put +5V on the red wire and black on ground can you see light emission from it?When you connect the white wire to a digital input (on Arduino or whatever) you'll need to put a pull-up resistor on that (say 10k) up to +5V.