hybridfree/eevblog-posts huggingface dataset:
N-CH MOSFET MARKED TN5CO ??? - Page 1
Forum section: electronics / projects

author: daveyk
author_rank: Frequent Contributor
timestamp: June 11, 2020, 09:22:05 pm
content: Found a bag of N-CH MOSFET MARKED TN5COAbout 13 in there strip holder. Transisitor checker states "N-E-MOS" C=188, Vt=1.4v"Any idear what transistor this might be before I toss them (or keep them)? They are tiny SMA parts, but the middle lead and back does seem to be a heat-sink for the part.Is there a chart anywhere that can translate SMT markings to a real part number?
N-Channel MOSFET test out-of-the-circuit - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: June 03, 2019, 06:47:47 pm
content: Hi,Testing five different IRF540N NMOS MOSFETs only one showed about 0.002V drop (instead of ~0.067 of the others) when it is ON state (Voltage between Source-Drain). All other tests are passed.So, should I consider this MOSFET as good or as bad?Regards.

author: Chriss
author_rank: Frequent Contributor
timestamp: June 03, 2019, 06:55:16 pm
content: HiI Would say they are all good.Sent from my SM-J500F using Tapatalk
N-MOSFET High Side Driver Circuit - Page 1
Forum section: electronics / projects

author: adrianodiaz
author_rank: Newbie
timestamp: November 12, 2018, 04:01:13 am
content: Hello, I'm designing a dc-dc buck-boost converter to closed loop control and I need a push-pull driver circuit to do this. Can anyone help me?

author: boB
author_rank: Frequent Contributor
timestamp: November 12, 2018, 04:12:45 am
content: First I think it would be good to build up a half-bridge synchronous buck converter with no closed loop... Say, with 50% duty cycle to start with.Synchronous buck because when the lower FET turns on, (or IGBT or...) it can pump the high-side driver capacitor to make the high side easy.This circuit will be bi-directional. Buck in one direction and boost in the other direction with double voltage on one side and half of that voltage on the other side.Choose one of many half bridge driver chips available. They will usually have a decent applications note. Don't forget to start with a current limited power supply at first to help keep the smoke in ! Also, best to use a driver that has built in dead time generation so one FET has time to turn off before the other FET turns ON and vise-versa.How much power and voltage are you looking at doing ?
N stage flip flop synchroniser for 8 bit input  - Page 1
Forum section: electronics / projects

author: AnuI
author_rank: Newbie
timestamp: May 04, 2018, 08:31:46 am
content: Hi all,I want to design an N stage flip flop synchronizer.For one bit input, I can use shift register of N bits and have my parameterized synchronizer as shown in code.//////////////////////////////////////////////////////////////module N_stage_synchronizer #(parameter NUM_STAGES = 2) (output sync_out,input async_in,input clk);reg [NUM_STAGES:1] shift_reg;always @ (posedge clk) beginshift_reg <= {shift_reg[NUM_STAGES-1:1], async_in};endassign sync_out = shift_reg;endmodule/////////////////////////////////////////////////////////But what to do if the input is a vector.For eg: Async is 8 bit.Then how to do it?Do i need to use an array?Any help would be appreciated.Thanks.

author: hamster_nz
author_rank: Super Contributor
timestamp: May 04, 2018, 08:44:23 am
content: You can either use arrays, or make a N*M bit long shift register, and shift it along M bits at a time (where N is the number of stages, and M is the number of bits).These are both equivalent (i.e. generate the same hardware implementation) but you will like the look of one more than the otherP s. It is customary to have arrays and vectors start at zero.P.p.s for best results you should use a synthesis attribute or constraint to let' the tools know that this is a synchronizer (e.g. ASYNC_REG for Xilinx).

author: AnuI
author_rank: Newbie
timestamp: May 04, 2018, 08:50:02 am
content: Thanks @hamster_nz.I was thinking about arrays only. But can we shift those?I have no idea about N*M long shift register, I ll look at it.

author: hamster_nz
author_rank: Super Contributor
timestamp: May 04, 2018, 10:16:39 am
content: With an array:Code:`timescale 1ns / 1psmodule sync #(parameter NUM_STAGES = 2, WIDTH = 8)(input clk,input [WIDTH-1:0] signal_in,output [WIDTH-1:0] signal_out);(* ASYNC_REG = "TRUE" *) reg [WIDTH-1:0] shift_reg [NUM_STAGES-1:0];integer i;always @ ( posedge clk ) beginfor(i = NUM_STAGES-1; i > 0; i = i-1)shift_reg <= shift_reg[i-1];shift_reg <= signal_in;endassign signal_out = shift_reg[NUM_STAGES-1];endmoduleWithout arrays:Code:`timescale 1ns / 1psmodule sync #(parameter NUM_STAGES = 2, WIDTH = 8)(input clk,input [WIDTH-1:0] signal_in,output [WIDTH-1:0] signal_out);(* ASYNC_REG = "TRUE" *) reg [NUM_STAGES*WIDTH-1:0] shift_reg;always @ ( posedge clk ) beginshift_reg <= { shift_reg[NUM_STAGES*WIDTH-1-WIDTH:0], signal_in };endassign signal_out = shift_reg[NUM_STAGES*WIDTH-1:NUM_STAGES*WIDTH-WIDTH];endmodule
QSPI NOR Flash Part Compatibility Identification? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: November 03, 2024, 12:03:46 am
content: Hi,I am not familiar with QSPI NOR FLASH. Is there some reliable way to:- either check if any of the attached NOR FLASH are compatible with the N25Q128A13EF840E (datasheet also attached)- or find one which is 100% compatible?Ideally a drop in replacement,but it does NOT have to be footprint compatible! The size can also be the same or largerPerhaps the "25" or "25Q" or "25Q128" in the part numbers guarantees that?Or some online part comparison tools maybe from those manufacturers (I could not find any)?I could obviously go through the datasheets but - apart from being time consuming - small (but very important) details might be missed when comparing them.Thank you
Name of Mitutoyo pcb connector??? - Page 1
Forum section: electronics / projects

author: MDM3D
author_rank: Contributor
timestamp: November 24, 2016, 04:23:24 pm
content: Does any one have any idea what type of connector is used to connect to a Mitutoyo digital indicator? The connections appears to be just exposed pads that are connected by spring pins like in this cable.http://ecatalog.mitutoyo.com/SPC-Connecting-Cables-C1643.aspxI would really like to not have to pay $40 for a tiny connector. I can post dimensions if they are needed.Thanks

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 25, 2016, 09:58:01 am
content: Almost certainly custom

author: jonwhite
author_rank: Contributor
timestamp: November 25, 2016, 10:26:16 am
content: Hi mikeLove your vids please keep making them thank you

author: jpanhalt
author_rank: Super Contributor
timestamp: November 25, 2016, 10:32:56 am
content: I did a project with the Mitutoyo dial indicator and ended up buying the control cable from Mitutoyo.John

author: Zom-B
author_rank: Regular Contributor
timestamp: November 25, 2016, 01:25:09 pm
content: Lol, I thought it says on the back "ABS Lute". What the hell is a 'Lute'? Ooh.. i c, AbsOlute!

author: ajb
author_rank: Super Contributor
timestamp: November 25, 2016, 09:46:23 pm
content: You can get SMT spring contact fingers, depending on the pitch a small PCB with a few if those might make a serviceable connector. But for a one off, may not be worth the hassle to save $40.

author: MDM3D
author_rank: Contributor
timestamp: November 25, 2016, 09:49:10 pm
content: Quote from: ajb on November 25, 2016, 09:46:23 pmOK would they actually be called that on a place like digikey or mouser or is there some trade name I'm missing like how dupont connoctors are .1 inch pin headers?Sent from my SAMSUNG-SM-G900A using Tapatalk

author: owiecc
author_rank: Frequent Contributor
timestamp: November 26, 2016, 01:04:30 pm
content: Just solder a pin header there. The pitch seems reasonable, maybe .1 header will fit.

author: ajb
author_rank: Super Contributor
timestamp: November 26, 2016, 06:38:03 pm
content: http://www.digikey.com/product-search/en/connectors-interconnects/contacts-spring-loaded-and-pressure/You may also find similar things categorized with EMI components, since such spring contacts are often used to make contact with shields integrated into mechanical housings.

author: MDM3D
author_rank: Contributor
timestamp: November 27, 2016, 02:27:36 am
content: The pitch appears to be 1.5mm so the easy solution of pin headers will not suffice and I do not want to solder to the $500 indicator board. The emi connectors look promising Ill see where that takes me. thanks for your help.
Name of toggle switches (or recommendations for alternatives) - Page 1
Forum section: electronics / projects

author: OM222O
author_rank: Frequent Contributor
timestamp: February 12, 2019, 02:27:32 pm
content: Sorry if this is a really basic / off topic question but I've used these toggle switches for all my battery powered projects so far to physically disconnect the battery when turning the device on (helps a lot with battery life):I usually buy them in packs which include a mix of momentary switches, toggle switches, etc, so I haven't been able to find the name of them yet.now I need to buy them in bulk for an upcoming project, so buying a pack of 100 switches to use is not an option! if you know the parameters for parametric search in mouser/digikey, please list them below. otherwise if you the name of them, that would help too! When I search for toggle switches I usually find things similar to a PC power button which is not what I want!

author: PTR_1275
author_rank: Frequent Contributor
timestamp: February 12, 2019, 03:13:04 pm
content: dpdt push on push off switchThat’s what I put into google and found a few results similar to what you’re wanting.Hope that helps

author: Ian.M
author_rank: Super Contributor
timestamp: February 12, 2019, 03:48:12 pm
content: You have a nomenclature problem. This:is a toggle switch. Its (usually) one member of the category: latching switches, though spring biased momentary toggle switches do exist.Your switches are push action latching DPDT switches.

author: OM222O
author_rank: Frequent Contributor
timestamp: February 12, 2019, 04:03:16 pm
content: Thank you so much! I found them!

author: Doctorandus_P
author_rank: Super Contributor
timestamp: February 12, 2019, 05:09:21 pm
content: I am particulary charmed by the soft power button of the obiquitous "transistor tester".In "standby" mode the current is difficult to measure ( < 100nA) with the equipment I have.The only current is leakage through a single PNP BJT.BJT's have inherent lower leakage then MOSfet's and a voltage drop of a few 100mV in "on" position is also no biggy when you have plenty to burn from a 9V battery.The Transistor tester I got does have space reserved vor the battery, but it does not have a decent way to mount the battery.But because expected battery life is 15+ years I simply glued the battery to the PCB with hot snot. Solid enough to last many years, and still removable if needed.As far as I know the switches from your picture come in bot latching and non-latching versions, so double check when ordering.

author: OM222O
author_rank: Frequent Contributor
timestamp: February 12, 2019, 06:04:44 pm
content: I think you just read my mind! I'm using a 9v battery and a 5V LDO! it would be nice to use a transistor / mosfet and the button just as a signal to it's base / gate! I might consider that but I want maximum battery life and dropout is more important than leakage (about a week of on time with medium current setting, less than 24 hours on high current setting), so might use a FET! Thanks for the idea!
Name that component (type!) - Page 1
Forum section: electronics / projects

author: mtechmatt
author_rank: Regular Contributor
timestamp: October 25, 2013, 12:07:28 pm
content: Any idea what the vertical row of components are on the right next to the plug. they seem to go to pretty much all the pins. This is an automotive engine managment unit/ECU. Inductors?CheersMatt

author: mmilejski
author_rank: Contributor
timestamp: October 25, 2013, 12:22:43 pm
content: Maybe it is some kind of surge protection? SMD Spark gap?

author: ConKbot
author_rank: Super Contributor
timestamp: October 25, 2013, 12:32:17 pm
content: Is that center section soldered to a pad in the middle? If so they are probably TVS diodes or some other sort of snubber for the signals. If its not it could be just an oddly packaged ferrite.

author: mtechmatt
author_rank: Regular Contributor
timestamp: October 25, 2013, 12:58:41 pm
content: Con,No dont think so, they appear to be 2 pin packages...

author: minime72706
author_rank: Frequent Contributor
timestamp: October 25, 2013, 01:55:58 pm
content: Can you tell (with a continuity meter) if they're in series with the data lines or if they're connected between the data lines and ground?EDIT: If they're connected between the data lines and ground, I'm going to go with varistor.If they're in series with the data lines? PTC resistor or ferrite bead.The electrical system of a car is absolute hell to electronics.

author: tszaboo
author_rank: Super Contributor
timestamp: October 25, 2013, 02:45:03 pm
content: Thoose are 3 terminal feed-through ferrite beads or filters. Common in older paralel bus systems, to filter out the high frequency junk.First example I could find:http://www.maruwa-g.com/e/products/electronic-parts/000354.html

author: minime72706
author_rank: Frequent Contributor
timestamp: October 25, 2013, 03:09:33 pm
content: Quote from: NANDBlog on October 25, 2013, 02:45:03 pmI'll go with that.Alternators are noisy!

author: Niklas
author_rank: Frequent Contributor
timestamp: October 25, 2013, 03:51:48 pm
content: Looks like NFE31P***, LCL-filters, from Murata.

author: free_electron
author_rank: Super Contributor
timestamp: October 25, 2013, 04:36:52 pm
content: T filters. LCL configuration. Murata sells boatloads of those.Code:-ferrite--+---ferrite--|capa|gnd

author: mtechmatt
author_rank: Regular Contributor
timestamp: October 25, 2013, 05:10:20 pm
content: Chaps, great find!This is what the EEV Forums are all about!Thanks again!!!!Matt
Name that connector...   - Page 1
Forum section: electronics / projects

author: pipe2null
author_rank: Regular Contributor
timestamp: November 07, 2020, 04:36:23 am
content: I have come across this type of connector many, many times, but I have no idea what type/name the connector it is.In this case, the connector is used for the 4-wire fan I'm replacing. I need to order the connector, or preferably a "standard" pre-crimped length that is longer than what is on the old fan I'm replacing.If you recognize the connector type please let me know, I'd appreciate it.

author: Monkeh
author_rank: Super Contributor
timestamp: November 07, 2020, 05:32:31 am
content: Molex Picoblade.

author: rfmerrill
author_rank: Regular Contributor
timestamp: November 07, 2020, 06:28:13 am
content: I concur, looks like picoblade to me. There are some JST connectors that look kinda similar but I actually have a four-pin picoblade right in front of me and that looks pretty much identical.If you're thinking of making something with them I would just buy pre-terminated wires. My coworkers and I have failed so hard trying to crimp picoblades, even with the super expensive official tool for it.

author: pipe2null
author_rank: Regular Contributor
timestamp: November 08, 2020, 10:03:15 pm
content: Thanks! That saved a ridiculous amount of time digging through the billion-and-one varieties of connectors. Now I can finish my retrofit of some decommissioned ancient enterprise network equipment I picked up. The hardware is beefy, but 90dBA max/80dBA idle (per piece of equipment) is a tiny bit too loud for desktop use. Heh.

author: ConKbot
author_rank: Super Contributor
timestamp: November 09, 2020, 07:16:41 am
content: Quote from: rfmerrill on November 07, 2020, 06:28:13 amI've done quite a few picoblade cable assemblies, and yeah they are one of the more challenging connectors to install. The stripping has to be very square, no bits and pieces of uneven insulation. The strip length is very short, stripping it long and using very flush cutters to get a very square end on the wire is needed, and I generally work under a stereo microscope to get the wire in the terminal correctly, and to inspect afterwards. I think digikey sells/sold individual wires terminated with picoblade contacts, along with some harnesses.

author: pipe2null
author_rank: Regular Contributor
timestamp: November 09, 2020, 07:57:14 pm
content: Thanks, very good advice.I found some premade picoblade to picoblade cables on Digikey that are the top of my candidate list. I'll just cut off one end and solder on a full-sized fan header. It would have been nice if the cable was available in lengths long enough to get 2 finished cables per premade unit, but they're only a few bucks each so not a huge loss.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 11, 2020, 03:29:38 pm
content: thks i was searching this one too
Name that connector? - Page 1
Forum section: electronics / projects

author: 84Corvette
author_rank: Newbie
timestamp: May 21, 2016, 03:41:27 pm
content: Hello everyone,I am trying to figure out the brand and model of the 12pin and 4pin connectors in this photo. I have searched digikey and google looking at pics but cant find this exact one. I need the connector to make a harness thats different from what Holley sells.

author: exmadscientist
author_rank: Frequent Contributor
timestamp: May 21, 2016, 06:47:49 pm
content: Looks like it might be Molex CLIK-Mate or perhaps one of JST's many offerings. What's the terminal pitch?

author: 84Corvette
author_rank: Newbie
timestamp: May 23, 2016, 12:36:23 pm
content: Molex Clik-Mate was it! Its a 1.25mm pitch.Thank you very much for the help.
Name the IC - Page 1
Forum section: electronics / projects

author: xfs
author_rank: Newbie
timestamp: March 28, 2017, 09:44:21 am
content: Hi guys,any idea what the IC could be? I'm not getting any results with what is written on it. I think itshouldbe a switching power converter.

author: bktemp
author_rank: Super Contributor
timestamp: March 28, 2017, 09:48:24 am
content: google: LBHM ->http://cds.linear.com/docs/en/datasheet/3471fb.pdf

author: xfs
author_rank: Newbie
timestamp: March 28, 2017, 10:46:35 pm
content: Dankscheee
Name this signal - Page 1
Forum section: electronics / projects

author: echen1024
author_rank: Super Contributor
timestamp: November 19, 2013, 01:15:54 am
content: I was always wondering what this signal was...

author: dannyf
author_rank: Super Contributor
timestamp: November 19, 2013, 01:23:01 am
content: A (frequency) sweeping sine signal.

author: echen1024
author_rank: Super Contributor
timestamp: November 19, 2013, 01:24:13 am
content: Ok. I had some suspicions it was that, but thanks for clarifying.

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 19, 2013, 03:09:17 am
content: Also known as a FM signal.

author: EV
author_rank: Frequent Contributor
timestamp: November 19, 2013, 09:50:41 am
content: A frequency modulated sine wave signal (FM).

author: tszaboo
author_rank: Super Contributor
timestamp: November 19, 2013, 04:33:41 pm
content: Chirphttp://en.wikipedia.org/wiki/Chirp
NAND flash with two chip-select - Page 1
Forum section: electronics / projects

author: zphaze
author_rank: Contributor
timestamp: July 14, 2020, 09:17:00 pm
content: Hi,I want to use this NAND flash chip, which has a capacity of 64Gbit. *(datasheethttp://pdf.datasheet.live/e35a5359/micron.com/MT29F64G08CBABBWP-12%3AB.pdf)On the pinout, I have two chip enable PINs (CE#/CE2#) :This chip has two dies inside the same package, but I technically only have one NAND_CE pin on my MCU (I don't have two).I wonder if anybody being familiar with NAND interfacing knows if it's doable to tie both chip enable (CE) PINs with a logic gate, so that if one needs to be enabled, both will always be enabled at the same time.Is the chip somewhat using the chip enable PIN as an "extra addressing bit" so that we cannot really enable both because the addressing will become confused (i.e. if both dies have the same 00h-FFh addresse ranges or something like that), or is it doable to have one PIN driving the two chip selects with logic glue.Thanks!

author: QuitButton
author_rank: Contributor
timestamp: July 14, 2020, 09:41:48 pm
content: Page 24 of the datasheet shows them as being separate logical units, so its in effect 2 separate chips in one case. So your "extra addressing pin" view of how it works is what it says it does.Or in other words, you need to enable each LU individually.

author: thm_w
author_rank: Super Contributor
timestamp: July 14, 2020, 09:53:29 pm
content: Its a distinct die so the memory addressing is going to be the same.Maybe some sort of address decoding or using a general IO pin is possible? What processor are you using?Quote

author: David Hess
author_rank: Super Contributor
timestamp: July 15, 2020, 04:34:10 pm
content: Quote from: zphaze on July 14, 2020, 09:17:00 pmThat is effectively exactly what it is, an extra address bit which requires external decoding.

author: QuitButton
author_rank: Contributor
timestamp: July 15, 2020, 07:25:39 pm
content: Page 2 of the datasheet shows different Classifications are available with different die numbers. Is there one available in the size you want with a single die?
Narrow 2.5 inch hard drive IDE connector - Page 1
Forum section: electronics / projects

author: ezalys
author_rank: Frequent Contributor
timestamp: February 25, 2025, 03:57:02 am
content: Hi All, I'm looking for an IDE cable or the appropriate connectors so I can make my own. On my TDS7104, the hard drive connectors have sockets with dimensions of 3.95 mm x 44.3 mm. It looks like the first attached image. Standard laptop IDE connectors look like the second image, where the clips on the side seem to interfere with the mating connector on the motherboard. Any suggestions?

author: robert.rozee
author_rank: Frequent Contributor
timestamp: February 25, 2025, 09:42:34 am
content: hi ezalys,assuming you do not unplug by pulling on the cablethe plastic clips on the sides contributenothingtowards holding the ribbon wiring in place once the cable is in service - each individual wire is securedentirelyby the metal 'V' clip that both mechanically captures and electrically makes contact with it. the side clips at each end of the connector then servemerelyto hold the plastic 'receptor' strip in place after crimping, so that it continues to cover up the exposed pointed tips of the metal 'V' clips. so you can just cut away those plastic side clips, and apply a little glue to hold the remains of the plastic strip in place so it continues to cover the top of the 'V' clips.but don't then go and unplug by pull on the cable!those IDC connectors sometimes also had an additional third part - a plastic back bar, which also had clips at the sides anddidhelp prevent any damage caused by pulling the plug out by the cable - the cable would be snaked around the back bar. but, as i recall, many/most cable makers left the plastic back bar out as IDE drive cables were not meant to be plugged and unplugged often.cheers,rob :-)
National Instruments NOOB question - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: April 11, 2024, 09:05:55 am
content: HiI have acRIO-9151IO expander from NI in a system. The modules installed areNI 9402I need to debug this system to see if the power is supplied to the modules from the IO expander. The system is not that accessible so the only option I have to do so is to plug one of the modules out and plug an old VGA cable in on the connector shown in the picture attached. I can then measure voltages on the other side of the cable.To do so I need the pin out of this connector. I can't seem to find the pin out for this connector anywhere. Not in the manuals of any of the equipment or during google searches. Is this pin out made public? Can someone point me to it?ThanksCicada

author: davegravy
author_rank: Regular Contributor
timestamp: April 11, 2024, 11:11:09 am
content: At the very least it used to be publicly posted. I dabbled in developing my own C-series module around 10 years ago and think I remember having this. There were a bunch of hardware developer resources including standard PCB dimensions and interior chassis dimensions/clearances, and I suspect the pinout details were together with these resources.This was at a former employer, so apologies that I don't have this handy.

author: Cicada
author_rank: Regular Contributor
timestamp: April 11, 2024, 02:02:19 pm
content: Quote from: davegravy on April 11, 2024, 11:11:09 amReally? That is interesting. So NI publish enough information for you to build your own custom modules.Is that true?That could be really interesting.

author: Cicada
author_rank: Regular Contributor
timestamp: April 11, 2024, 02:05:05 pm
content: Found the pin out, sort off. See attached.

author: davegravy
author_rank: Regular Contributor
timestamp: April 11, 2024, 02:09:05 pm
content: Quote from: Cicada on April 11, 2024, 02:02:19 pmThey do. There's many 3rd party c-series modules you can buy.I recall NI sells blank modules with just the cutout for the backplane connector in it so you can fit your own prototype PCBs into it. You just have to machine the front of the module.
National Semiconductor CDIP-14 chip identification, circa 1984 - Page 1
Forum section: electronics / projects

author: russell--
author_rank: Newbie
timestamp: March 13, 2025, 12:18:49 pm
content: Hi, I'm trying to figure out what a chip is on a board I'm reverse engineering. It is on the "Function Board" of an IBM Wheelwriter 5 typewriter from around 1984. I found a link from a company that says they have stock:https://www.americanmicrosemi.com/product/SA879971/.Their are photos consistent with the one I have. There is a National Semiconductor logo, and the IBM part number is "849 3328", then the next line has "SA 879971". On the Function Board, it has a role in mediating power for battery backed SRAM (where the typewriter stores settings like tabs and margins and other state, up to 8KB of data. The pinout is odd and hasn't matched anything I've been able to find. See attached circuit sketch.It smells like some kind of op-amp. When the +12V and +5V power rails are turned on, I measure the following voltages:pin1: 12.57 pin14: 0.061pin2: 5.733 pin13: 0.005pin3: 4.995 pin12: 0.705pin4: 5.732 pin11: 12.95pin5: 12.59 pin10: 5.731pin6: 5.732 pin9: 6.353pin7: 4.958 pin8: 6.358delta V across the 74ohm resistor connecting to pin 1, I measured 0.430V.I have googled pretty hard, asked chatbots, and come up without an identification, much less a datasheet. Any ideas?

author: russell--
author_rank: Newbie
timestamp: March 13, 2025, 12:20:14 pm
content: Sorry about the image, not sure how to make it a reasonable size.

author: squadchannel
author_rank: Frequent Contributor
timestamp: March 13, 2025, 01:12:49 pm
content: it appears to be overwritten with an IBM house number.it is not even on the only list, so have to be patient and look for it.https://github.com/retrotruestory/ibm

author: jwet
author_rank: Frequent Contributor
timestamp: March 13, 2025, 05:22:17 pm
content: I believe the part is LM3045 Transistor Array. The pin outs and voltages make sense. The function makes some sense. I need to redraw it a couple of times to really get the function but I think its sort of "Or'ing" circuit for a battery backed RAM before such things existed. The 74 ohms feeds the collector of Q1 and Q2, their emitters to to the RAM vcc. The bases of these two transistors are at 5.73 by the supply at emitter of Q3(pin 7). Q4's emitter drives the floating circuit that looks to power most of the bases. The base of Q4 goes to the collector of Q3 (the pin 8/9). This seems to be at 12 - a Vbe, Q4's emitter looks like its positive feedback back to Q3's base? Q5 is somewhat bizarre, it seems to maintain a 47k load on the backup battery while 5v is on???Good luck. These transistor arrays were common in test equipment in my youth (I'm 67). I think the guys designing that stuff were IC designers and these things made sense to them. They were reasonably matched too. RCA, TI and MOT made similar parts. They were pretty cheap.

author: Simon
author_rank: Unknown
timestamp: March 13, 2025, 08:10:54 pm
content: https://www.eevblog.com/forum/projects/national-semiconductor-cdip-14-chip-identification-circa-1984/msg5846461/#msg5846461
National Semiconductor NMC27C32Q-45 datasheet - Page 1
Forum section: electronics / projects

author: Wawavoun
author_rank: Regular Contributor
timestamp: January 16, 2021, 09:46:57 am
content: Hello there,I try to find the datasheet of this eprom... No success on the internet !Anybody has this document and can share it ? At least a confirmation of VPP (programming voltage) ?Regards.Philippe
National Semiconductor standard cell ASIC reverse engineering. - Page 1
Forum section: electronics / projects

author: Phaseseeker
author_rank: Regular Contributor
timestamp: August 30, 2022, 12:59:17 pm
content: I'm trying to reverse engineer an ASIC (die pics here:http://ic.onidev.fr/map/SCL1054.html, thanks to Boris Marmontel for the images) which uses standard cell logic. The problem is that, while there's some databooks online with standard cell libraries from other manufacturers, I can't find anything for National stuff. Any idea where I could find them? Or is my only option tracing the chip transistor by transistor?Thanks in advance for any help.

author: pcprogrammer
author_rank: Super Contributor
timestamp: August 30, 2022, 01:08:31 pm
content: Wow, not really of help, but this looks likes even a bigger challenge then what I'm working on, reverse engineering the bit stream for a FPGA.Success with your project

author: isometrik
author_rank: Regular Contributor
timestamp: August 30, 2022, 01:22:24 pm
content: Not sure if that would help, but there is a RCA part number (TA14564A) in the bottom center of the die.

author: Benta
author_rank: Super Contributor
timestamp: August 30, 2022, 06:30:46 pm
content: Why do you think it's an ASIC?That part number looks a lot more like a standard SiTel device, which was taken over by National.NSC fabbed for SiTel, so yes, it was probably built as an ASIC, but sold as a standard part.

author: Phaseseeker
author_rank: Regular Contributor
timestamp: August 31, 2022, 12:02:52 pm
content: I thought it was an ASIC mainly because there's absolutely no info online (I tried searching both the National and the RCA P/N) and the package is also marked with "IPM 57708", IPM being the manufacturer of the device it's in.

author: Benta
author_rank: Super Contributor
timestamp: August 31, 2022, 02:27:47 pm
content: Both SiTel and later on NSC were very restrictive on giving out data on their telecom parts back then. They normally didn't appear in data books, and often a signed NDA was necessary to get a data sheet.But the SCL devices were standard parts for a very restricted number of customers.

author: Phaseseeker
author_rank: Regular Contributor
timestamp: August 31, 2022, 03:53:09 pm
content: Makes sense. I tried contacting Renesas, maybe since it's obsolete (or at least should be) they'll give me some data on the parts. Anything would be better than tracing it lol
Natural Convection with MATLAB - Page 1
Forum section: electronics / projects

author: s.mosfet
author_rank: Contributor
timestamp: June 19, 2011, 06:50:37 pm
content: I want to solve the problem of the natural convection for various types of surfaces, with the help of MATLAB.The software i want to write, must be able to give, as result, the flux velocity an the temperature trend in space, given the temperature of the surface of a flatbed, for example.I know that the software must be able to solve numerically a set of equations (heat, Navier-stokes..etc..).I'm seeking for FEA, FVM, FDM (Finite Element, Finite Volume, Finite Difference Method).I'm sure that someone has already solved these kind of problems.Do you know where i can find the MATLAB code of the solution of this problem (with FEA,FVM and FDM)?Any others useful informations are welcome.thanks
NAU8810 + SIM7600G => issue in 3G while OK in 2G and 4G - Page 1
Forum section: electronics / projects

author: Mich35
author_rank: Newbie
timestamp: April 10, 2025, 04:12:57 pm
content: Hello,I am using a NAU8810 with a SIM7600G. The NAU8810 is fully controlled by the SIM7600G. The speaker sound is OK in 2G and in 4G. In 3G the sound is only a high parasitic noise.Do you have any idea?Did you already meet such an issue?Best regardsMich
NAU8822/NAU88C22 - minimum setup PCB - Page 1
Forum section: electronics / projects

author: analityk
author_rank: Regular Contributor
timestamp: May 20, 2022, 09:07:14 pm
content: Hello,Many monts ago i have started my adventude with this chip. I think (i know) it have all things what i want for many years in my home audio (pretty standard 2+1 config) but this chip have far more options. Today i have use two this simple pcb, most often like preamplifier. One chip make some DPS and feed amplifiers for 2 speakers (middle and high tones) and second work as mixer and low pass filter (again DSP) for feed subwoofer (passive).As long as all this feature are rather basic and work good it can work as my ethernet sound card. Codecs are conneted with I2S (and I2C) bus to ATSAME70Q21A uC and i can feed it by my local network (IP/UDP) from my PC (i have wrote another application in C#). PC read mp3 from local hard drive, converting it to wave and send it in 1kB packed frames to uC, where double buffering and DMA make rest of work. It work.Another good point is NAU8822/NAU88C22 have automatic level controller implemented for working with microphones (another hint is it can make low noise signal for ECM). You can use it like mic amplifier and ALC make good job.Best of all this future is price - circa $1.5In my PCB was linked below i implemented low noise LDO (followed by one transistor capacitance multiplier), I2C voltage converter (it can work with 5V and 3V3 uC with doesn't care about voltage translation), and lastly it have place for clock generator (not quartz stabilizer) or it can be clocked from uC.I will not desing this pcb again but if you want i strongly recomended - if you wana use i2s - place series resistors close to chip on this 4 lines. (33R-100R). It can be one ladder resistor.https://oshwlab.com/Analityk/nau8822glhf
Navigation Button Solution - Page 1
Forum section: electronics / projects

author: Xenos
author_rank: Contributor
timestamp: March 23, 2022, 10:46:45 pm
content: I am looking for a source for a three-button navigation module, as shown in the picture. Using my Google-foo, I have found multiple manufacturers of five-button solutions, but only one that makes a three-button model. Has anyone come across another three-button solution?

author: thm_w
author_rank: Super Contributor
timestamp: March 23, 2022, 11:50:03 pm
content: The one you linked:https://www.shanpu.com.tw/en/product/series/SNA3What about just using 4 way and having left/right do nothing?It looks like these are modular, you could not install the left and right ones:https://www.alibaba.com/product-detail/4way-navigational-LED-Push-Button-Switch_60754607671.html

author: Xenos
author_rank: Contributor
timestamp: March 24, 2022, 02:27:58 am
content: I thought about getting a 4-way and not using the side buttons, but I like the aesthetics of the 3-way. I also thought about using Apem triangular and round button caps to from their mec series, but I don't have a cnc mill to carve the holes. Decisions, decisions.

author: Renate
author_rank: Super Contributor
timestamp: March 24, 2022, 08:03:27 pm
content: Boy do I hate "5 way" switches> They are designed for people with teeny tiny thumbs.I do Bluetooth. I just made a clicker using a stock plastic enclosure from Serpac.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 24, 2022, 08:50:27 pm
content: You could also consider one with a central pushbutton and a rotary encoder. You get the same functionality, with more "efficient" navigation.

author: Xenos
author_rank: Contributor
timestamp: March 25, 2022, 07:38:39 am
content: The five-button size issue is spot on to my concern. I could see myself, or other users, fat-fingering the input. It's ironic; I initially thought of using a rotary encoder and ordered a bunch of Bourns ECW1Ds. I like the idea of the encoder with a large diameter flat knob that has a fingertip indentation. Thanks to you all for the feedback.

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 25, 2022, 08:49:37 am
content: What about these directional switches?www.aliexpress.com/item/4000681560472.html
Navigation switch, push to action, rotate to select - Page 1
Forum section: electronics / projects

author: riscy00
author_rank: Contributor
timestamp: February 24, 2013, 02:43:01 pm
content: I'm looking for menu navigation switch in Panel mount or SMD, where you rotate the switch shaft to select menu and then push shaft for action or confirm.I google this, check farnell, digikey and could not find.I keep crossing the 5 way navigation switch is not what I want.Can anyone suggest proper name for this and point me catalog where I can but it for lab use?Thanks

author: firewalker
author_rank: Super Contributor
timestamp: February 24, 2013, 03:03:25 pm
content: Rotary encoder with push switch?Alexander

author: jeroen74
author_rank: Frequent Contributor
timestamp: February 24, 2013, 05:27:10 pm
content: You are looking for something likethis.
Navigation switches - who, what, where, how much? - Page 1
Forum section: electronics / projects

author: DTJ
author_rank: Super Contributor
timestamp: February 14, 2016, 09:01:50 am
content: I'm looking at nav switches for a project that will be made in batches of 20 or 30. They need to look nice and be easily installed.I need to implement power on/off, function select and also once a function is selected adjust parameters of the function. The device will have a LCD to assist in button operation.C&K do these (pic attached).http://www.designworldonline.com/uploads/Imagegallery/C&K%20Components%20Switches.jpgBut they are expensive at around $9 each. Some suppliers like Element14 are dropping them so availability in the future may be an issue.The little tact nav switches are nicely priced but packaging them is a problem as many don't come with buttons or actuatorshttp://au.element14.com/multicomp/mcmt5-f-v/navigation-switch-5way-smd/dp/1316987https://www.e-switch.com/search?utf8=%E2%9C%93&q=navigation&commit=GO#.VsBAtVIvTzAAda Fruit sell tact nav switches with buttons but thats probably not a reliable long term source.https://blog.adafruit.com/2012/05/18/partfinder-friday-5-way-joystick-navigation-switch/These are good but the price is way to high:http://www.buywitheeze.com/electrical-028000000/switches-081000000/navigation-081050000/multidirection-081050003/switch-kit-navigation-spno-black-sw05102I've thought of integrating a keypad into the label but I think the cost will be too high.Any suggestions or solutions?

author: awallin
author_rank: Frequent Contributor
timestamp: February 14, 2016, 08:35:33 pm
content: two words: touch screen O0

author: DTJ
author_rank: Super Contributor
timestamp: February 15, 2016, 03:57:11 am
content: awallin:Touch screens..... yeah nah. Cost is my reject reason for these.blueskull:The 5 way tact buttons are ok but the manufacturers don't seem to want to supply an actuator button with them, probably because there will be lots of panel depths, colors and styles needed.The joysticks are no good for me as I'm going into digital inputs (no ADC). If they came in a switch version they might be ok. I'll check that option out.My other line of thinking is membrane keypads. I'm going to need a poly carbonate label anyway.Thanks for the ideas.

author: HAL-42b
author_rank: Frequent Contributor
timestamp: February 15, 2016, 04:39:04 am
content: 5 way tactile is 1.95hereOther options are the classic numpad and the menu keys around the screen.

author: DTJ
author_rank: Super Contributor
timestamp: February 15, 2016, 05:49:35 am
content: Thanks Hal, but as previously mentioned they don't sell a knob/nub/button to go with it.
NCP1380 - Page 1
Forum section: electronics / projects

author: fgsantos7
author_rank: Newbie
timestamp: July 20, 2020, 05:01:17 pm
content: Greetings, I'm not new to the forum, but I always used it a lot for consultation, and never to ask for help, guess this my first time for that.I'm working on a project of a switched power supply based on the on semi's NCP1380B IC.I've made some design changes and now I feel I'm stuck.I can't get it to work properlly.In annex you can find my schematic. I'ts very similar to the one found in the development board NCP1380EVB/D.At this point I think the IC starts badly cause the VCC voltage drops a lot after the first switching sequence.I'm able to get around 5V in the secondary but if I connect a small load it drops but goes up again in each switching sequence.The next images were captured all without any load connected to the secondary.https://www.dropbox.com/s/vfrjvbd576bm1z3/DS1Z_QuickPrint1.png?dl=0Yellow -> DRV PinLight Blue -> VCC Pinhttps://www.dropbox.com/s/hqs7u363rc3xfxw/DS1Z_QuickPrint3.png?dl=0Yellow -> DRV PinLight Blue -> VCC PinPurple-> Fault PinBlue ->FB PinMORE IN DETAILhttps://www.dropbox.com/s/ybilizoa1vt4m0d/DS1Z_QuickPrint4.png?dl=0https://www.dropbox.com/s/ybilizoa1vt4m0d/DS1Z_QuickPrint4.png?dl=0Does anyone knows how this guy works?I think the voltage in VCC pin gets too low after switching, but the voltage in Taux is normal and aceptable for the NCP1380
NE ELVIS Mk 1 Proto-system - Anyone got one? - Page 1
Forum section: electronics / projects

author: HarryDoPECC
author_rank: Regular Contributor
timestamp: January 27, 2020, 11:12:40 am
content: I picked up one of these - it has decent proto area, power supplies, basic fn gen and I thought it would be a nice little stand alone proto system. No power pack but it said +/- 15v and I though "how hard can it be to work out the pins"HaHa - no useful silkscreen, Google-fu finds nothing. One pin is zero ohms to the proto board gnd, but two others are not quite zero..? And no continuity to the 15v on the proto-area because of course there are current limit and protection circuits in the way. Multilayer SMD board is not immediately easy to trace.So, before I get out the magnifier and try to reverse engineer where those power pins go - does anyone have one of these and can you tell me the pinout of your power supply?Thanks soooo much!

author: ChristofferB
author_rank: Frequent Contributor
timestamp: January 27, 2020, 12:34:30 pm
content: Cool unit! looks great for low freq stuff!The circuit between the input connector and the rails are probably very straightforward. I think it will be self evident once you've had a look at the board inside + a quick probearound with a continuity tester which pin is what.-Chris

author: Caliaxy
author_rank: Frequent Contributor
timestamp: January 27, 2020, 02:57:41 pm
content: Never got my hands on one of these, but always wondered how they work. According to a connection diagram on the NI website, it seems to me that in order to be able to use one of these with Labview (DMM, scope), you also need a NI acquisition board in the computer (and a nasty 68-pin NI cable). Is that right?Once you figure the power supply, please let us know.

author: HarryDoPECC
author_rank: Regular Contributor
timestamp: January 27, 2020, 08:18:01 pm
content: It’s not straightforward.... the power rails on the protoboard are not connected to the power input, there is current limit circuit in between I am guessing. I have examined the internal board closely, there is no helpful silkscreen and it’s multilayer with no easy fat power traces to follow. Power input circuit is all SMD so not so easy to trace and reverse engineer.The unit can do lots of measurements etc with PC interface and software but there is switch selectable Local mode which is standalone and will still be very useful.But first I have to figure out the power. And before I dive into the reverse engineer I am hoping that someone here may have the answer readily to hand.

author: Caliaxy
author_rank: Frequent Contributor
timestamp: January 31, 2020, 02:58:08 am
content: Check this out:

author: HarryDoPECC
author_rank: Regular Contributor
timestamp: January 31, 2020, 03:28:28 am
content: Bingo! You're gold, thanks so much.The power of the interwebs.....
NE592 video amplifier - Page 1
Forum section: electronics / projects

author: PbFoot
author_rank: Contributor
timestamp: September 05, 2012, 01:08:33 am
content: Hi,I am working on a circuit to sense very small infrared pulses. I am using a TAOS TSL267 for a sensor. It's a got the PIN diode and transimpedance amp in one device. I am using four of those summed together. Then, I want to pass the signal to a NE592 video amp to bump up weak signals. I will be configuring the amp as single sided instead of differential input.I am looking at the NE592 datasheet, but I am very new to this type of a device. Looking at some of the example circuits, I am trying to figure out exactly how to get the signal into the 592 so it will be happy.In the attached image, what are the 51 ohm resistors on the left side (the inputs) for? I know it's a basic question, so please pardon my ignorance.

author: GK
author_rank: Super Contributor
timestamp: September 05, 2012, 02:19:57 am
content: They are just there to terminate the input signal into ~50 ohms. When sending (just for example) high frequency signals over a length of coax, the receiving end needs to be properly terminated.The 51 ohm resistor on the unused input could be omitted (pin just shorted to ground) with very little effect on quiescent DC balance, which isn't of any consequence as the output signal(s) are ac coupled.This part is essentially the same as the long obsolete uA733. There are plenty of cheap high speed op-amps available that would do the job just as well (since you don’t need differential inputs anyway). Any particular reason for picking this part? Or do you need differential outputs?

author: PbFoot
author_rank: Contributor
timestamp: September 05, 2012, 03:25:28 am
content: Thanks for the info! I only chose the 592 because it seemed like it would be good for receiving fast pulses, and I saw it used in some designs that are similar in application to mine. I don't need differential inputs or outputs. I plan to output to a 74121, and then into a microcontroller. I have some AD620 on hand. Maybe those would be better?Any advice you can offer on a good choice for a single sided amp would be greatly appreciated.Thanks!-PbFoot

author: GK
author_rank: Super Contributor
timestamp: September 05, 2012, 04:15:21 am
content: Since you intend to trigger a monostable (74**121) what you really need is some form of threshold detector. Your best bet would be a comparator IC with a logic level output that can drive the trigger input of the monostable directly. How fast (duration) are your pulses? Perhaps even something basic like an LM311 with a logic-level pull-up resistor would be adequate.I don’t have the time right now to look up the datasheet for your IR receiver, but depending on its gain and signal output level you may not even require a signal gain stage in the middle.
ne602 LO question - Page 1
Forum section: electronics / projects

author: ledtester
author_rank: Super Contributor
timestamp: February 12, 2016, 03:25:41 am
content: Hi,If I already have a LO signal, how should I connect to a NE602/SA612?For instance, looking at the block diagram in the datasheet (see attachment), it looks like I could connect my LO signal to pin 6 and leave pin 7 unconnected?Thanks!

author: nugglix
author_rank: Regular Contributor
timestamp: February 12, 2016, 07:28:56 am
content: Hi!Yes, your signal should be fed into pin 6 via a capacitor and pin 7 should be grounded with a capacitor.You should also have an eye on the amplitude of your LO signal.CheersGuido