hybridfree/eevblog-posts huggingface dataset:
Help Dating a Chip - Page 1
Forum section: electronics / projects

author: NY2KW
author_rank: Regular Contributor
timestamp: January 19, 2023, 09:56:31 pm
content: I have searched the datasheets but none mention how dating is stamped on these ZeroPower SRAMs.Is the manufacture date 1999 for both of these examples, or is one 2014 and the other" alt="" class="bbc_img" />2021?Its an important distinction for estimating remaining litium battery lifeThank you in advance.Jerry NY2KW

author: NY2KW
author_rank: Regular Contributor
timestamp: January 19, 2023, 09:58:09 pm
content: or is it 2005 and 2012?

author: aargee
author_rank: Frequent Contributor
timestamp: January 19, 2023, 10:00:13 pm
content: Tinder? Sorry, had to...But - I'd go for 6th week of 1999.

author: inse
author_rank: Super Contributor
timestamp: January 19, 2023, 10:08:18 pm
content: But they look different, thats why I also would guess for 05 and 12

author: Benta
author_rank: Super Contributor
timestamp: January 19, 2023, 10:39:58 pm
content: Certainly not the 2xxx years. The EU battery directive forbade embedded cells before that, allowing only removable cells, and ST stopped production at that time IIRC.9906 could be right.

author: NY2KW
author_rank: Regular Contributor
timestamp: January 19, 2023, 11:05:24 pm
content: I don't think they are forbidden. St makes a slighlty different version with an embedded lithium cell as of Sep 2020. See ATTACHED

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 19, 2023, 11:28:29 pm
content: I wouldn't mind dating a bunch of chips.

author: Benta
author_rank: Super Contributor
timestamp: January 19, 2023, 11:41:31 pm
content: Belgium's the place to go...

author: bdunham7
author_rank: Super Contributor
timestamp: January 19, 2023, 11:45:33 pm
content: Quote from: aargee on January 19, 2023, 10:00:13 pmMy first read was "Help dating a chap"...so Grindr, I guess.

author: Nusa
author_rank: Super Contributor
timestamp: January 20, 2023, 12:17:02 am
content: Quote from: NY2KW on January 19, 2023, 09:56:31 pm

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 20, 2023, 03:34:48 am
content: https://datasheet.datasheetarchive.com/originals/library/Datasheet-039/DSA0087013.pdf

author: Tomorokoshi
author_rank: Super Contributor
timestamp: January 20, 2023, 04:15:24 am
content: Where did you get them from?
Help deciphering Sharp LCD module datasheet - Page 1
Forum section: electronics / projects

author: Entropia
author_rank: Regular Contributor
timestamp: May 13, 2014, 06:51:31 pm
content: So I have this Sharp LCD module, type LQ5AW136. Datasheet is here:http://www.sharpsma.com/download/LQ5AW136-SP-122605pdf. I want to feed it video signal but I don't quite understand what it's expecting to receive.On the other hand it speaks of bog standard NTSC and PAL composite video but then the pinout talks about separate sync signals as well as analog R, G and B signals. Maybe someone has dealt with similar displays and know what kind of signal it's expecting?The only sane(-ish) explanation I can come up with is that it wants three monochrome (no color subcarrier) composite video signals, one for each color component. This sounds silly to me and if I wanted to feed it for example PAL composite video I would have to go through quite a bit of signal massaging to get it displayed properly.Any help?

author: Unknown
author_rank: Unknown
timestamp: May 14, 2014, 12:41:09 am
content: Quote from: Entropia on May 13, 2014, 06:51:31 pmLooks like it wants separate R,G,B, Horizonal & Vertical sync - the references to NTSC & PAL seem to be purely descriptive of the frame/field/line timings it can accept.What are you planning on using it for? VGA provides RGB & separate H & V sync, so provided you can tweak the resolution & timing from the card to within PAL or NTSC specs it should be relatively easy to get working as a computer monitor.Anything else will require extracting the separate colour signals + H & V sync, which will depend on the source format. RGB + composite sync is relatively easy to deal with, RGB with sync on [green|blue|red] a little more complex, YPbPr a little more complex again, and s-video / composite the most complex.Google should bring up a few reasonably simple circuits & converter ICs - a TDA3330 / LM1881 combination was once common for composite to RGB+sync conversion, though AFAIK both ICs are discontinued.(Huh - looks like theLM1881is still current, but the TDA3330 is long gone.)

author: Entropia
author_rank: Regular Contributor
timestamp: May 14, 2014, 06:52:47 pm
content: I would ideally want to feed it composite video. So I will have to whip up a composite to RGB+sync signals. TDA3330 is still available on eBay, although it's very costly. Now that I googled TDA3330, there are alternatives as well, although all are obsolete.

author: Unknown
author_rank: Unknown
timestamp: May 15, 2014, 01:52:15 am
content: Yeah, it looks like many of the all-analogue video chips have disappeared (ithasbeen a while since I last looked!). Seems like these days you're expected to use back-to-back video->digital and digital->RGB(HV) converters.The easiest way to do what you want might be to buy a cheap composite -> RGB adaptor from ebay etc, then use a LM1881 to extract the sync.Note that the LM1881 outputs combined H+V sync and V sync. Often you can get away with treating the combined sync signal as the H sync; if not, you can gate the combined sync with the V sync to extract just the H sync signal.
Help designing a Low Noise Switcher multiple output - Page 1
Forum section: electronics / projects

author: Houseman
author_rank: Regular Contributor
timestamp: November 15, 2022, 11:37:20 am
content: Hi forum.For a mixed signal device (analog part and digital part) I need to have multiple rails in order to make the device function properly.I need in order:-36V and +36V for analog output circuit (max current 500mA)-24V +12V for the DAC part (100mA)5V references, 3.3V reference, 2.5V reference. (for the DAC and digital part MCU, TFT display)The goal is to power the device from 5V USB port (or even USB-C device) but at the moment DC power is not a problem.It can be connected also via mains and a 12V trasformer.The main requisite is obviously the lowest noise possible expecially in the DAC part and the analog output circuit part. No specs have been given so far, but the challenge is that so many switcher can contribute to global noise. I know it sounds a little blurry but I am newbie to this topic and a little bit confused about what to keep in mind in a so vaste plateau of switching power supply choice from main electronic manifacturers..Any help or any book to read or take example from would be very helpful expecially in the -+36V part. I have tried the selection table in power management of Analog Devices but I understand taking main design kit and adapting them is not a great way to follow.Best regards

author: jonpaul
author_rank: Super Contributor
timestamp: November 15, 2022, 02:40:05 pm
content: Bonjourno Senior,Please préciser the requirementsquantity per run, per year? Compliant with IEC, EU, US EMI? Max size available?I suggest that you create a specification and RFQ, send to power supply and power module manufacturers rather than DIYCiao,Jon

author: Houseman
author_rank: Regular Contributor
timestamp: November 15, 2022, 04:41:39 pm
content: Bonjour.And thanks.Yes compilant IEC and EU EMI. Size does not matter.By the way I have found a powerful tool of TI called Webench.It gives me at least the power to view different topology and run simulations for output performances.Best regards and thanks.
Help designing a P-Channel FET circuit for switching an external tablet mic - Page 1
Forum section: electronics / projects

author: xtv
author_rank: Contributor
timestamp: August 10, 2021, 04:43:51 pm
content: Hey guys,I'm using a high-end tablet as a satnav / multimedia interface in my car.To make things nicer, I'm using a MCU to read the can-bus commands from the steering wheel, triggering the tablet's playback functions through the headphones jack.I'm redesigning the circuit and wanted to add a voice command functionality, using an external mic.For that, I need to be able to switch the mic on and off using the mcu 5v logic level.I'm guessing switching the positive side is ideal, as the transistor will add some resistance and having some resistance between the ground and the mic ground would generate noise?The thing is that, the mic+ terminal on the tablet outputs something between 1v and 2v (waiting for a TRRS plug to confirm the exact tension).I've built a circuit on Circuitlab and did some simulations, but they only look reasonable if the mic+ terminal would be 4v or 5v. When I drop things below 2v, the FET will only flow current when the gate falls below zero.I'm really not knowledgeable with transistors, so I'm wondering if I'm just not using the right part, or if my circuit isn't correct. Any advice will be helpful.Many thanks.Circuit:https://ibb.co/6W3KjL1Simulation 1v8 mic jack:https://ibb.co/F3ypmfBSimulation 4v mic jack:https://ibb.co/7SDt0cDSimulation 5v mic jack:https://ibb.co/2Pmct0x

author: RES
author_rank: Regular Contributor
timestamp: August 10, 2021, 08:45:54 pm
content: A better P-channel MOSFET is an enhancement type for example like the PMV32UP, has a much lower Vgs (P-ch mosfet switch in high side supply rail) Or if you want to toggle the audio signal then better use a special popless/clickless analog switch chip.
Help designing boost controller - Page 1
Forum section: electronics / projects

author: Carborundum
author_rank: Newbie
timestamp: January 30, 2016, 09:30:16 pm
content: I have a project that requires a very high power boost controller.have found the LTC3787 as a good start.But I do not know how exactly to get more power out of a circuit with only one LTC3787 (FETS and inductors are cheap, the LTC3787 is not).I have been told that reducing the inductance value of the inductors to reduce the duty cycle and using more powerful MOSFETs should work, but I do not know exactly how or what mods I need to have done.The circuit needs to handle a 12V 65A input and a 36V ~20A output (~800 W).Please help.I have attached the image of the circuit from thedatasheetfor reference.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: February 04, 2016, 12:23:40 am
content: Yeah at that sort of current the inductor will be the most expensive component.
Help designing simple buck converter - Page 1
Forum section: electronics / projects

author: KEIN NEIN
author_rank: Contributor
timestamp: June 10, 2019, 01:10:21 pm
content: I am using this book as a reference:https://www.amazon.com/Power-Supply-Cookbook-Design-Engineers/dp/075067329X/ref=sr_1_1?keywords=power+supply+cookbook&qid=1560171597&s=gateway&sr=8-1I was planning to design a buck-converter for a CPU but to my understanding nowadays all motherboards and graphics cards use multiple syncronous-buck converters driven by a voltage controller so it's to complex and I don't think I'll be able to implement that anytime soon.So I'd rather build a simple buck-converter employing a shottky-diode and a power MOSFET. But can you give me real-world scenarios in which these are used? I am particularly interested in computer applications.Some of my ideas are:12V to either 5V or 3.3V PC SMPS DC-DC power converter9V to 5V step-down (for attaching a battery to a USB port and charging stuff)pico-PSU (though I am not sure wether or not a pico-PSU is an actual buck converter)Thanks in advance

author: KEIN NEIN
author_rank: Contributor
timestamp: June 10, 2019, 01:13:28 pm
content: I need this data:Input voltage range,Output voltage,Maximum output current,Output ripple voltage,Output regulation,

author: erikka
author_rank: Regular Contributor
timestamp: June 10, 2019, 05:34:38 pm
content: For inspiration for a simple buck converter look herehttps://www.onsemi.com/pub/Collateral/MC34063A-D.PDF

author: HB9EVI
author_rank: Frequent Contributor
timestamp: June 10, 2019, 05:45:04 pm
content: there are many real world scenarios for any size of buck converters, for beginners to mention is the higher efficiency; 5V from 12V with a LM7805 and 1A current draw results in a loss 7W while only using 5W - an efficiency of only about 29% ; with an efficient buck converter you can reach 95%not only you save energy, you save on heatsink size as well.somethin what you cannot do with linear regulators at all is upconversion, so from lower to higher voltage, a boost converter, or from a positive voltage to a negative voltage - an inverter
Help designing this single ended btetrode output section - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: October 03, 2022, 11:02:18 pm
content: I'm trying to design this circuit to utilize feed-forward cancellation in the power supply to maximize the ripple rejection.in the preamp it was simple but for the tetrode output it's not that simple because of negative feedback.the tube is a 6P44S russian tube, it's very similar to an EL500 tube so I'm using the datasheets for that.the plate voltage is around 265V, the screen voltage around 250V. transformer turns are listed there, and it's a 10:1 ratio for the cathode feedback winding.looking at the datasheet I should be expecting a 10mA/V change from the control grid, which with a 3000ohm load would be a 30V change in the plate voltage, so 3V for the cathode voltage...so... the hell?futhermore, the cathode voltage changes 3.3V with a 10mA change.the screen voltage shouldn't change much since it's feed from a relatively small 470ohm resistor.so how do I go about calculating the gain with all this feedback in the circuit?

author: TimFox
author_rank: Super Contributor
timestamp: October 03, 2022, 11:14:49 pm
content: I know you don't like Spice, but it would be a simple calculation to use the linear tube conductance values you quote to make an equivalent circuit with current generators and plate resistances.Use .AC mode, not .TRAN.However, you do need to know the screen-grid control conductance, since there is a net screen-cathode AC voltage with this circuit.
Help determine MEFL resistors values and few other questions - Page 1
Forum section: electronics / projects

author: MladenGavric
author_rank: Newbie
timestamp: April 21, 2025, 03:06:21 pm
content: I'm guessing that 'bigger' ones (on the left) are 2.7Ω (red, violet, gold, gold) - I'm not sure though.The 'smaller' ones (on the right) are five bands (red, yellow, black, black, brown)?? So... 240Ω?They are right after the Schottky diodes.And can someone, please explain the purpose of these resistors and a smaller cap in this circuit? The bigger cap is for filtering, I suppose. Also, did I drew the circuit right?

author: madires
author_rank: Super Contributor
timestamp: April 21, 2025, 03:44:19 pm
content: Seems to be brown, black, black, gold and red. That's 100 * 0.1 = 10 Ohms and 2% tolerance. Each RC pair is a low-pass filter (two stages in this case). Their purpose is to reduce AC ripple.

author: MladenGavric
author_rank: Newbie
timestamp: April 21, 2025, 04:13:19 pm
content: Thank you so much! Did I get the value right of the ones on AC1 side? 2.7 Ohms?

author: madires
author_rank: Super Contributor
timestamp: April 21, 2025, 04:18:04 pm
content: Yep, 2.7 Ohms, 5% tolerance.
HELP: Faxitron DX-50 specimen X-RAY system - Page 1
Forum section: electronics / projects

author: subolg123
author_rank: Contributor
timestamp: April 07, 2014, 06:25:53 pm
content: I have a good friend that needs some help. He is a very seasoned engineer and asked me some time ago to help get a Faxitron DX-50 system running, He picked up this thing from eBay and plans to put his own imager in it but needs to get past the proprietary interlock circuit to get the X-Ray tube to fire. Without a signal from the PC that it is supposed to be connected to, it remains in standby. We have no manual and it is virtually impossible to obtain one without the FDA showing up at the door. This is what he has written me regarding his efforts in obtaining a manual or documentation so we can enable this beastOK.The nice folks pointed out that the Faxitron is a regulated device and would need testing and licensing before use. They have records of the serial numbers and where the device is "supposed to be." And it was a hospital in Kentucky, not a private citizen on the west coast.They are a business and have the purpose of returning a profit to the shareholders. Providing information to an unlicensed user would generate precious little revenue and create all sorts of regulatory and legal grief even if I did not injure myself.The lower connector is for the archaic camera module, now removed. The DB-9 is an interlock / handshake for the computer to control / interlock the operation of the x-ray source.Can anyone here provide some guidance or help in getting us past the interlock? My friend will gladly pay if someone has a manual or knows someone in the biz?
Help figure out this power supply for uv lamp from water purification system - Page 1
Forum section: electronics / projects

author: crossorb93
author_rank: Newbie
timestamp: September 09, 2024, 02:25:56 am
content: Just for fun I thought I would figure out the workings of this power supply for a consumer water purification device which features a ~30W uv lamp. It failed and I got a new one so I'm free to take it apart. Most of it seems straighforward but I have a couple of questions.The PIC microcontroller is powered by a SOT23-3 chip marked "50K". Anyone know what this might be? It looks like it might be a voltage regulator. It's powered from the AC line input through a large resistor and a diode. The IR2153 is powered in a similar way but it has an internal zener that clamps vcc to 16V. Would this little chip have something similar or have I missed something in the circuit?The other question relates to the 4 connections to the lamp. One wire gets the square wave from the power mosfets after smoothing by a 0.8mH inductor. Another is ground. The third and fourth wires are connected by a capacitor. I don't understand why there are two wires going through the current sense transformer. How does this bulb work and what is the function of the third and fourth wires?

author: moffy
author_rank: Super Contributor
timestamp: September 09, 2024, 06:44:02 am
content: Quote from: crossorb93 on September 09, 2024, 02:25:56 amI would guess that the tube has heater filaments, hence the 4 wires, two through the current transformer would double its sensitivity. I would also assume that it is resonant, hence the inductor and capacitor are producing something approaching a sine wave and the resonance or Q is producing the voltage multiplication.

author: crossorb93
author_rank: Newbie
timestamp: September 10, 2024, 02:11:32 am
content: Thanks, that gives me some reading to do.With no starter, how does this system produces the initial large voltage spike to strike the arc?

author: IanB
author_rank: Super Contributor
timestamp: September 10, 2024, 02:52:29 am
content: I think some lamps don't necessarily need a high voltage to start. Heated filaments can emit enough electrons to start a discharge going without a high voltage across the tube. Once the discharge is operational, the heated filaments can be disconnected.

author: moffy
author_rank: Super Contributor
timestamp: September 10, 2024, 03:34:21 am
content: Quote from: crossorb93 on September 10, 2024, 02:11:32 amAs IanB said also without the discharge the Q of the circuit should be higher, producing a higher starting voltage which would drop when the discharge starts, a negative resistance region or a case of current increasing with decreasing voltage.

author: moffy
author_rank: Super Contributor
timestamp: September 10, 2024, 11:09:40 pm
content: The reason for the two wires through the current transformer is, Wire A carries the full load current and Wire B carries the resonant cap current, so my guess is they are subtracting the cap current from the load current to get only the tube current.
Help Figuring out SMD Flex Cable Connector for N114-...-C08 135x240 TFT display - Page 1
Forum section: electronics / projects

author: product_dev_as_a_hobby
author_rank: Contributor
timestamp: March 30, 2024, 11:58:07 am
content: Im trying to figure out what SMD connector this mates with.The data sheet I found for a similar display like the Newvisio N096-1608TBBIG09-C08 also includes no name for this connector.Edit: I believe I figured it out and its an FPC connector, which is apparently enough information to go with. I couldn't find something with a matching locking tab, but did findthisIm still looking for the name of the locking tab, so if someone had the perfect search term, that would be awesome. Im surprised I still havent seen any.
help figuring out what has this guy done with the NFBL in an amp - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: July 02, 2020, 02:58:05 am
content: I've built a replica of an amp guitalogist made a few years ago:but I can't figure out one thing, and it's the only thing he didn't really show, is the NFBL switch, it has 3 positions, on-off-on, he says that "it switches between 2 NFBL resistors, you can also put it in the middle where there's no NFB"which would make me think he has a resistor to ground before the switch, because originally the amp got the DC bias on the PI trough the OPT.here's the shematic of the output of his conversion of the amp that was last filmed (only thing he changed is coupling cap values from 47nF to 100nF)[ Attachment Invalid Or Does Not Exist ]the original amp was a Grommes-50PG2 (or PG3)here's my best guess to what he has done with it,[ Attachment Invalid Or Does Not Exist ]maybe you have a better guess to what he did with the NFBL switch.

author: duak
author_rank: Super Contributor
timestamp: July 02, 2020, 06:20:56 pm
content: The 1K0 resistor has to do two functions. The first is feedback from the transformer secondary. The second is to establish the correct voltage on the cathodes of the 12AX7. Your modified circuit will vary the DC operating point of the 12AX7 and cause some significant pops when switched. It might be possible to split the 1k0 cathode resistor into say 900R in series with a 100R and applying feedback to the resistors' junction (in essence a 'T' network) but there would still be a variation in the DC operating point.To your modified schematic I would add a capacitor of at least 10 uF between the cathode of the 12AX7 and the feedback resistors. The 2k2 resistor from the cathode to ground should be 1k0, the same as before. There might be a small pop when switching feedback from charging or discharging the new capacitor so I would add a 10k resistor from the right side of the new capacitor to ground.The new capacitor's value of 10 uF will give a gentle boost to frequencies below 20 to 30 Hz depending on the gain. If you think this affects bass response, try increasing its value.

author: TimFox
author_rank: Super Contributor
timestamp: July 02, 2020, 07:11:41 pm
content: Assuming the DC connections to the cathode of the input triode are correct in your first drawing, then duak is correct in saying that the 1k resistor sets the bias point, since the cathode current flows through it.My guess about a switch is that it switched the right end of the 1k resistor from the 4 ohm tap (less feedback), to ground (no feedback), to the 16 ohm tap (more feedback). These positions would have the same DC voltage across the 1k.

author: trobbins
author_rank: Frequent Contributor
timestamp: July 12, 2020, 12:13:46 pm
content: Are you using exactly the same output transformer?Do you know the level of feedback, and if the amplifier is confirmed to be stable?
Help find a low capacitance miniature coax cable? - Page 1
Forum section: electronics / projects

author: cvanc
author_rank: Frequent Contributor
timestamp: March 14, 2020, 04:24:19 pm
content: Currently using RG174 which is tiny and flexible and 31pF/foot. I've looked for other small coax with less capacitance but came up empty.I can use something larger if needed, but all I've found that has significantly lower C was almost a half inch in diameter; that's too big.Am I missing a good candidate somewhere, or is RG174 about as good as it gets?Impedance does not matter - it will carry analog audio. Thanks...

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 14, 2020, 04:58:15 pm
content: why do you care at capacitance if its only for audio? there are much smaller 1.13mm dia coax in ebay, but about the same capacitance as stated. i think a pair of audio or twisted wires is much lower capacitance.

author: cvanc
author_rank: Frequent Contributor
timestamp: March 14, 2020, 05:08:21 pm
content: Quote from: Mechatrommer on March 14, 2020, 04:58:15 pmFairly long runs; they're about 30ft/10m

author: daqq
author_rank: Super Contributor
timestamp: March 14, 2020, 06:27:24 pm
content: Try the higher Z0 ones, such ashttps://www.mouser.sk/datasheet/2/46/89269-84006.pdf, with 12.8pF/ft.

author: Someone
author_rank: Super Contributor
timestamp: March 15, 2020, 07:47:55 am
content: Quote from: cvanc on March 14, 2020, 05:08:21 pmAudio bandwidth into 1nF still isn't hard and would be typical of normal balanced+shielded audio cable for those lengths.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: March 15, 2020, 01:51:38 pm
content: Look at Belden 8421 and similar. It's larger, but quite flexible.

author: jonpaul
author_rank: Super Contributor
timestamp: March 15, 2020, 02:21:03 pm
content: Audio bandwidth or digital audio eg AES/EBU, AES3id, SP/DIF?There is a trade off between cable diameter and capacitance.Impossible to make a practical cable of very small OD and very low C.Jean-Paul

author: TimFox
author_rank: Super Contributor
timestamp: March 15, 2020, 02:31:58 pm
content: RG-174 has a solid polyethylene dielectric, which has the highest dielectric constant of the common coax insulators.For lower capacitance, you can use foam polyethylene, teflon, or foam teflon to get lower dielectric constants and smaller capacitance for a given diameter.
Help finding 230v equivalent to 110v magnetic ballast - Page 1
Forum section: electronics / projects

author: Isamun
author_rank: Regular Contributor
timestamp: June 17, 2013, 06:15:39 am
content: Hi!I have a LUXO Wave ESD magnifying lamp that runs off 110VAC. I want to convert it to 230VAC. It uses twoTDC p class reactor ballasts(DBA-15P) rated for 13W, 0,3A. I have been searching high and low for a 230v version, without luck. They need to be the same form factor/size. Anyone know where I can find them?

author: BravoV
author_rank: Super Contributor
timestamp: June 17, 2013, 06:29:21 am
content: Get an ordinary CFL lamp with similar wattage, and rip out the electronic ballast and do some mod job. Probably it will be much smaller than that transformer.Reference ->https://www.eevblog.com/forum/beginners/can-i-use-cfl's-ballast-to-power-fluorescent-lamptube/

author: Isamun
author_rank: Regular Contributor
timestamp: June 17, 2013, 06:43:13 am
content: Quote from: BravoV on June 17, 2013, 06:29:21 amThank you for that input! Although its not quite what i wanted to hear, I can see that you have some experience on this topic. I would prefer get the correct ballasts online, but I guess that is looking to be difficult. Ill see if I can find some other LUXO CFL's around and check out their ballasts. Just knowing the manufacturer would make searching easier.

author: SeanB
author_rank: Super Contributor
timestamp: June 17, 2013, 07:33:55 am
content: Look for a cheap UV money checker, they do have the right ballast form factor in them. Alternatively just buy a mains transformer of the same size or slightly bigger that still fits the housing and use the primary winding as the ballast, leaving the secondaries unconnected. The magnetising current will be about right for this lamp.
Help finding a board-to-board solution - Page 1
Forum section: electronics / projects

author: alex89
author_rank: Contributor
timestamp: September 14, 2020, 01:53:44 pm
content: Hello guys, I'm looking for a bord-to-board solution with the following requirement:Stack height: 4 to 6mmPitch: 1.27 to 2mmPcb thickness: 3.2mmDouble row40 positionTrough-holeI've been looking for the past few days but didn't have any luck .. any suggestions ?Thanks

author: Benta
author_rank: Super Contributor
timestamp: September 14, 2020, 03:54:53 pm
content: www.precidip.comno affiliation.

author: Gribo
author_rank: Frequent Contributor
timestamp: September 14, 2020, 04:11:09 pm
content: Did you check Samtec? (no affiliation either).
Help finding a connector series for a project - Page 1
Forum section: electronics / projects

author: stuple
author_rank: Newbie
timestamp: April 25, 2021, 06:40:58 pm
content: Hey all, how you goin'I'm working on a replacement power supply for a 2-wire LED string and I don't want to have to cut off the original connector since the original power supply is fully functional (it's just missing a dimmer) but I can't seem to find a matching socket to use as the output from my power supply. Does anyone know how to search for this kind of thing more usefully than clicking on every 2-pin LED driver board? Some photos and a sketch of the dimensions are included in the attachments. I would appreciate any help in finding a matching connector (ideally a panel mount socket).Thanks in advance!All the best,StuEdit: It seems that the thread might be 5/8" with 11TPI instead of M16x1.5. Unfortunately I don't have a thread gauge to check against.
Help finding a plug used in Tektronix THM720 handheld scope - Page 1
Forum section: electronics / projects

author: TERRA Operative
author_rank: Super Contributor
timestamp: April 11, 2023, 11:04:03 am
content: Hi all,I'm looking for the plug and socket used in the Tektronix THM720 series of hand held scopes for the CCFL backlight connection.It's 2.54mm pitch and has a stylised 'M' or 'CM' logo on the socket.On the plug it has a stylised 'M' logo, I'll try to get a photo soon, it's really small....Does anyone recognize this connector, or the logo so I can narrow down my search?

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 11, 2023, 08:36:42 pm
content: Herehttps://forum.digikey.com/t/help-identify-the-manfacture-of-this-connector-m-symbol/12519someone tried to find the Logo too and did not get an usable answer.

author: TERRA Operative
author_rank: Super Contributor
timestamp: April 12, 2023, 12:56:18 am
content: Yep, that's definitely the same brand. Now to figure out justwhatthat brand is....

author: srb1954
author_rank: Super Contributor
timestamp: April 12, 2023, 11:46:58 am
content: Quote from: TERRA Operative on April 12, 2023, 12:56:18 amMaybe it is Murata. I have seen a similar logo on some of their ceramic resonator products.
Help finding a replacemet transistor for FMY3 - Page 1
Forum section: electronics / projects

author: Steve T
author_rank: Contributor
timestamp: August 29, 2023, 04:37:22 pm
content: HelloI am a novice in electronics and seem to be stuck on finding a replacement transistor. I am working on a Sony gv-8, 8 mm tape player (video Walkman). The caps have all leaked, which I have replaced. The PCB boards were all fine except for the LCD display board, which was very corroded. I did some trace repair, but am still working on issues.I am currently stuck trying to replace 2 transistors. One is a FMY4 which I have found on Digikey. The other is a FMY3 transistor (?complementary to FMY4) which I cannot find anywhere. My knowledge of electronics is quite basic and I am struggling to find a substitute. I was hoping that some one on the forum would be able to assist me in finding a suitable substitute.Here is a link for the data sheet with both transistors:https://alltransistors.com/pdfview-s.php?doc=umy3n__fmy3a__y3____sot353__sot23-5_&dire=19Thank you for your help.Steve

author: ElectronicsHobbyist
author_rank: Contributor
timestamp: August 29, 2023, 06:42:52 pm
content: Both consist of a 2SA1037AK PNP Transistor and a 2SC2412K NPN Transistor. They are just connected together differently.I would just order these two types of transistors (they are available on digikey) and use some enamelled copper wire to connect them together and to your circuit.I hope I could be of help.

author: Steve T
author_rank: Contributor
timestamp: August 29, 2023, 07:16:32 pm
content: Thanks for the reply.I was wondering if I could do that. My other idea was to buy a 6 pin transistor array and run some jumpers.Steve

author: ElectronicsHobbyist
author_rank: Contributor
timestamp: August 29, 2023, 07:23:57 pm
content: The problem with a 6 pin transistor array is that you probably wont find one with the exact same specifications as the FMY3 and FMY4. But when you order the Transistors they specify in the datasheet they should behave about the same as the original. If it was some precise instrument it might also be on one package to keep them well matched but i don't think that's the point here. In the datasheet of the FMY1Ahttps://fscdn.rohm.com/en/products/databook/datasheet/discrete/transistor/bipolar/fmy1at148-e.pdfthey say that it cuts the mounting cost in half. So I think you can replace it with the two Transistors, no worries.

author: Steve T
author_rank: Contributor
timestamp: August 29, 2023, 07:48:27 pm
content: That’s great. Thanks again!

author: stowwest
author_rank: Newbie
timestamp: October 10, 2023, 07:59:28 am
content: Quote from: ElectronicsHobbyist on August 29, 2023, 07:23:57 pmVery useful, many thanks!
help finding a shematic for this push pull 6P3S (6L6GC) Russian "hifi" amplifier - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: April 18, 2020, 09:20:40 am
content: I bought this amp and converter it to a JCM800 style amp.it used a 5Z4S rectifier, 2x 6P3S power tubes, 6N1P PI tube, 2x 6N2P pre-amp tubes.the power supply was: rectifier - 4uF cap - choke - 20uF cap (connected to power amp), - 20k resistor - 10kthe screens were connected directly to the center tap of the output transformer, it was cathode biased. the center tap of the output transformer was connected AFTER the choke.nothing connected before the choke.it had 2 mic inputs, each has volume pots, and an aux input, it had some tap on the output transformer for an NFBL I supose, it wasn't connected to the output.the oldest tube is dated 1963, it's one of the power tubes. rectifier, one power tube, one of the preamp tubes. are dated 1972.one preamp tube dated, 1971, and the last one dated 1967.one tube shield dated 1957, another 1970, and the last one seems to be dated 1955 (not sure of that last one).oldest pot is dated 1968, newest - 1978.transformers seem to be made by some "KD" company, in the logo there's a Russian "K" and "D"the power transformer seems to have a center taped 13.6V heater winding (or 2 6.3V that are connected together in one point)and yeah I probably should've found the schematic (if there is one) before I re-did the entire circuit.the middle is the choke, the smaller one on the end is the output transformer, and the biggest one is the power transformer.(also yes I know, the layout of the transformers is bad, but It'll have to wait for a new chasis probably anyway.[ Attachment Invalid Or Does Not Exist ]
Help finding cross-ref for unique MOSFET - Page 1
Forum section: electronics / projects

author: iXod
author_rank: Frequent Contributor
timestamp: January 31, 2017, 11:43:39 pm
content: Need to replace a dead NXP MOSFET, BUK101-50GL:http://www.nxp.com/documents/data_sheet/BUK101-50GL.pdfNo longer available. The dead one controlled a half-dozen 25A SSR's at a rate <10 hz.It has some unique features: overcurrent protection due to overtemp or short-circuit; "logic and protection" (not sure what this is). Can't find a replacement with similar features.Replacement needs to be through-hole, preferably TO-220. It's not heat-sinked so not critical that it be that form-factor, just that it match up with the PCB lead holes.NXP has no cross-reference resource on their site and when I called was told to google the original pn. No help there.Any assistance matching a replacement would be a great help.Thanks.

author: Benta
author_rank: Super Contributor
timestamp: January 31, 2017, 11:47:29 pm
content: Try Infineon

author: iXod
author_rank: Frequent Contributor
timestamp: January 31, 2017, 11:59:41 pm
content: Thanks for that. Infineon provides a cross-reference resource which recommends AUIPS1031 which does look similar enough to the BUK101.Cheers!

author: Andy Watson
author_rank: Super Contributor
timestamp: February 01, 2017, 12:00:28 am
content: VNP35N07 looks close.Try searching under "intelligent mosfet" or "protected mosfet".

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 01, 2017, 12:10:50 pm
content: Huh, it drives SSRs? I wouldn't think the protection feature would be at all necessary. (And, perhaps, insufficient for it to survive anyway? What's up with that?)Which is a rather chilling thing, actually. How thehelldid that thing fail in the first place? That's a far more interesting question...Tim

author: Zero999
author_rank: Super Contributor
timestamp: February 01, 2017, 06:00:18 pm
content: Quote from: T3sl4co1l on February 01, 2017, 12:10:50 pmI agree. Perhaps the original poster is mistaken and it was used to drive contactors rather than solid state relays or the MOSFET in question is part of an SSR?
Help finding data on Sanken SI-7301A Motor Driver - Page 1
Forum section: electronics / projects

author: HalFoster
author_rank: Frequent Contributor
timestamp: June 17, 2019, 06:35:14 pm
content: Picked up a few of these recently but can't find any information on them. The datasheet for the 7300/7330 parts is available, but nothing on this model. I imagine it was a semi-custom part.Thank you,Hal
Help finding datasheet - Page 1
Forum section: electronics / projects

author: iXod
author_rank: Frequent Contributor
timestamp: June 23, 2021, 10:14:04 pm
content: It's a spindle motor controller on a Samsung HDD pcb: Marvell SH6125B. Out of production of course. Several sites say they have a datasheet but those link to datasheetcatalog or alldatasheet which have nothing.Thanks.

author: amyk
author_rank: Super Contributor
timestamp: June 24, 2021, 12:31:17 am
content: Not a Marvell part. All pictures I can find of it show a TI logo.HDD parts' datasheets are usually not public, unfortunately. Here's a list of others including yours, some with datasheets:http://www.hddoracle.com/viewtopic.php?f=100&t=91Depending on what you want to do, you might be able to find sufficient similarities with those.

author: iXod
author_rank: Frequent Contributor
timestamp: June 24, 2021, 12:58:17 am
content: Quote from: amyk on June 24, 2021, 12:31:17 amRight you are!Saw the hddoracle page. Not sure how to make use of those other IC data. If I don't have datashet of SH6125, not sure how to know what is similar/different.Thanks for your reply.
Help Finding Datasheet for 14S201X3, 20S471X3, and ZNR14K182  - Page 1
Forum section: electronics / projects

author: kilimar
author_rank: Newbie
timestamp: November 07, 2022, 05:13:52 am
content: I couldn't find anything for 14S201X3 and 20S471X3 ("EV" is above the number, so that might be the EnergeticTech brand) other than some sites in China as a distributor with form to contact for quote but no actual information. As for ZNR14K182, I see that Skycraft (and Skycraft on eBay) has some basic info but not detailed.Can't locate the EnergeticTech company neither....Thanks,-k

author: kilimar
author_rank: Newbie
timestamp: November 10, 2022, 08:14:23 am
content: Any suggestions for replacements for the aforementioned (14S201X3 and 20S471X3) components?

author: albind
author_rank: Newbie
timestamp: July 15, 2023, 07:14:15 am
content: ... found the post when checking out my junk box. I could smash them to find out what is inside, if interested. This is what I have pulled off a board, EV branded in a ceramic box:14S201X3, 4 pins.14S471X1, 2 pins.20S201X3, 4 pins, two of those.20S201X1, 2 pins.Bye for now, Albin.
Help finding datasheet for IVL2-7/5 VFD display tube - Page 1
Forum section: electronics / projects

author: shanecy
author_rank: Contributor
timestamp: December 16, 2014, 07:01:12 pm
content: I've ordered this soviet made display tube located herehttp://www.sovtube.com/en/nixie-tubes/825-ivl2-7-5-vfd.html. I'm at my university now so this site is blocked but I believe this is the correct URL. Either way its full product ID is IVL2-7/5 VFD display tube which is located on sovtube.comI'm having a hard time locating the datasheet. Right now i'm so desperatefor a datasheet I wouldn't care if it was in another language. I've searched on the "sovtube.com" website but cannot find any extension for a datasheet. I've google'd several search parameters but still cannot find a datasheet. I've searched several websites like mouser and digikey but they don't carry these kind of displays. I've found basic schematics from other peoples projects and some decent app notes but no technical datasheet yet. Can someone give me some guidance on other sources I could try or any help on locating this datasheet.ThanksShane

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 16, 2014, 07:08:08 pm
content: Why not ask?http://www.sovtube.com/en/contact-us

author: shanecy
author_rank: Contributor
timestamp: December 16, 2014, 08:03:36 pm
content: Yes, that would be an obvious solution.I'll have to do it when I get home, University is blocking the site. Thanks

author: envisionelec
author_rank: Frequent Contributor
timestamp: December 18, 2014, 04:26:48 am
content: There is a series of photos of the datasheet in this eBay listing:http://www.ebay.com/itm/Lot-of-10-IVL2-7-5-IVL-VFD-DIGIT-CLOCK-DISPLAY-TUBE-GREEN-NIXIE-Tube-New-FREE-SH-/250980504381
Help finding datasheet for oscillator - Page 1
Forum section: electronics / projects

author: tree
author_rank: Regular Contributor
timestamp: March 23, 2014, 12:02:35 am
content: I couldn't find a datasheet for the following oscillator. It seems the part number is NSA0172B.Thanks.

author: Vgkid
author_rank: Super Contributor
timestamp: March 23, 2014, 12:26:28 am
content: Have you tried emailling ndk ( Nihon Dempa Kogyo) and inquiring about it.

author: dannyf
author_rank: Super Contributor
timestamp: March 23, 2014, 12:38:27 am
content: NDK 16Mhz.Likely a tcxo or vc-tcxo.NDK is typically tough to deal with.
Help finding Device connector for vertical installation sth like C14 or C7 - Page 1
Forum section: electronics / projects

author: ESXi
author_rank: Regular Contributor
timestamp: February 03, 2020, 03:25:36 pm
content: Yo folks,So have some old technology here, vintage old school active hi-fi speakers. Some revisions have a smaller device connector hole, it turns out.I modded older revisions of them and threw away the C10 from the 1970s because a C10 connector1. is not at all universal and if you lose the cable you're screwed2. the freaking cable costs me at least 3 times the price of a normal C13 cable with a length of 2 meters.I wanted to enlarge the mounting hole only a few mm / inch, but the metal back plate is 3 mm or 0,11811 inch thick! I think my dremel is too weak for this, and I don't want to mess it up an angle grinder, of course this wouldn't work anyway because an angle grinder is not meant for such small dimensions...The dimensions of the mounting hole:C14 just doesn't fit, I tried to file some ABS plastic away from a C14 connector and finally I went through the damn thing, so this won't work either.Any other ideas?

author: SeanB
author_rank: Super Contributor
timestamp: February 03, 2020, 07:22:52 pm
content: How about C7, C8 or the C5, C6 sockets. Should be easy to get one that will either clip into the opening, or which can be made to fit with a bit of the correct gap filling epoxy yo make up the right dimensions. The C5, C6 is likely to be a drop in part, as the spacings of the pins is the same, and they should be easy to get as well.

author: ESXi
author_rank: Regular Contributor
timestamp: February 10, 2020, 01:05:54 pm
content: Quote from: SeanB on February 03, 2020, 07:22:52 pmThanks for the suggestions. Would rather not like to use eproxy to keep it as original as possible. But if there's no other way maybe I will.Looking at it now I think C6 would fit most likly, and will also be up to the task because the speakers can use up to unknown watts from the wall. The original connector is rated up to 6 amps @ 250volts. Most C6 cables I see are used for laptop power adapters which go up to maybe 4 amps max (what I have seen so far). My laptap adapter has a C14 and is rated for up to 9.5 amps. I think the limit of C14 was 10 amps?https://www.stayonline.com/product-resources/reference-iec320.aspAccording to this website it is only 2.5a internationally, so that is not enough because it has a 6a socket in it.HmmmI don't know what to do I'm almost at the point of f*ck it I'll buy the special cable..
Help finding documentation for OCXO - Page 1
Forum section: electronics / projects

author: ZBIQ
author_rank: Contributor
timestamp: December 17, 2014, 07:29:16 pm
content: Hi!It is my first topic at EEEVblog. So Hello!I have recently bought ocxo stable oscillator (for about 9$ - so worth it). It works fine, but there is no data sheet for this device.Here is the ocxo photo:http://img03.allegroimg.pl/photos/oryginal/48/76/94/72/4876947200The whole pcb is disassembled from GSM transmitter. Marking on it says:PC9203 V255RADIOSYSTEMSWEDEN ABTVM 351 131 R2It has FPGA, uC and few memories. There are also connectors: BNC and SMB. So, I think the whole PCB is GPS disciplined oscillator.I think circuit works (after suppling voltages leds are blinking). But without documentation this board is useless...Can you help me finding DS for OCXO?Mateusz

author: fcb
author_rank: Super Contributor
timestamp: December 17, 2014, 07:41:29 pm
content: Vectron maybe able to help.Else, you can probably reverse engineer the board to work out the connections (which maybe enough for your needs).

author: ZBIQ
author_rank: Contributor
timestamp: December 17, 2014, 08:04:27 pm
content: Ive done some research on OCXO. I know where goes power supply and where comes out frequency. But there are two more pins. One is connected to DAC (by chip '224 91G722' - opamp??). Another one is unknown (maybe some Vref out?)...This board has 6 layers (!) - reverse engineering is very hard.

author: dannyf
author_rank: Super Contributor
timestamp: December 17, 2014, 10:09:22 pm
content: The dac pin is likely the control / tunning pin: apply a voltage to it to fine-tune the output frequency.The other is the ground pin, likely.

author: TSL
author_rank: Regular Contributor
timestamp: December 18, 2014, 02:25:30 am
content: A better picture of the entire board would help, once we can see the part #'s on all the chips we might get some ideaTT

author: babysitter
author_rank: Frequent Contributor
timestamp: December 18, 2014, 07:02:08 am
content: QuoteA DAC would only make sense on tuning voltage as dannyf pointed out. If it tunes - just load it with a resistor. Frequency shall jump between loaded and unloaded. The change might be too small to see on a scope, use a frequency counter or listen to it on a shortwave radio, best would be if you would hear a beat note. Tuned to a harmonic the jump would be more distinct.The additional pin might be reference or for mechanical purposes (stability). If its a reference output you could see if its actually used when you load it with a resistor to ground to reduce it a few mV and check if the DAC output voltage sags accordingly.

author: khach
author_rank: Contributor
timestamp: December 18, 2014, 09:54:23 pm
content: Piezo 10MHz OCXO and QK Quarzkeramik GmbH 10MHz OCXO from similar boardhttps://sites.google.com/site/sp7roh/

author: ZBIQ
author_rank: Contributor
timestamp: December 19, 2014, 05:02:20 pm
content: Thats fantastic ! So, from now I know pinout. Its time to check performance of the OCXO.Tank you very much !