hybridfree/eevblog-posts huggingface dataset:
Nordic PPK2 - software question - Page 1
Forum section: electronics / projects

author: LogicalDave
author_rank: Regular Contributor
timestamp: October 13, 2023, 11:26:25 pm
content: I am a long-time Joulescope user. I love the product other than its cost. I recently bought a Nordic Power Profiler Kit II (PPK2) and while I like it a lot, there seems to be a serious issue that may be my not knowing how to configure it properly or is something Nordic can and should easily fix. The problem is that it logs data into a RAM buffer and then stops. The faster you're sampling, the faster the buffer fills, so at 100Ks/s, you can only log for 500s. This means you can't monitor average current or cumulative power consumption with good resolution for more than 500s. At lower sampling rates, you can monitor for longer, but then the results are bogus: fast events are missed or their power consumption is incorrect.The real-time setting supports a continuous mode, but seems useful only for capturing transient events via a trigger.Does anyone know how to make the PPK2 data logging mode just keep logging (RAM buffer should wrap when full) so you can monitor cumulative/average power info at high resolution over long periods of time?

author: thm_w
author_rank: Super Contributor
timestamp: October 13, 2023, 11:52:47 pm
content: They are saying the sample rate is always the same:https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/log-continuously-for-up-to-500-days-with-the-ppk2-1226309406This seems like a completely normal tradeoff.Maybe you can find some way to stream the data to the PC.https://github.com/IRNAS/ppk2-api-python

author: LogicalDave
author_rank: Regular Contributor
timestamp: October 19, 2023, 04:13:55 am
content: Thanks @thm_w I have been testing the PPK2 (latest software and firmware) logging an IoT device that has a brief (~800uS) 16-17mA pulse every 20s and idles around 4uA the rest of the time. With the sample rate at 100s/s (10ms/sample) that pulse is shown as only a few hundred uA. At 1ks/s (1ms/sample) -> 1.4-1.8mA. At 10ks/s (100us/sample) -> 11-12mA. At 100ks/s (10uS/sample) -> 16-17mA. The peak shown is also what is recorded as the "max" current value. So at a minimum, the peak recorded currents seem to be affected (radically) by the sampling rate and don't seem to be an average of the current drawn over the sample period. I'll do some longer tests to try to characterize the accumulated power consumption vs. sample rate.

author: Shonky
author_rank: Frequent Contributor
timestamp: October 19, 2023, 05:26:38 am
content: Sampling at 1kHz I can understand somewhat missing a 800us pulse. It would have to change range going up by over three orders of magnitude but that is done largely in hardware as I understand it.However at 10kHz I would expect it to be closer to the real value. Are all 7 or 8 samples for the 800us pulse reading 11-12mA?Do you have some screen shots?I have one too. Perhaps I can try and replicate.
Noritake VFD - Page 1
Forum section: electronics / projects

author: mojoe
author_rank: Frequent Contributor
timestamp: April 02, 2016, 03:03:39 am
content: Can anyone identify the microcontroller in the linked picture? It is on a Noritake VFD. Is there a particular microcontroller that Noritake commonly uses?I tried attaching the image, but it is too big. I want to keep the detail, thus the Dropbox link.https://dl.dropboxusercontent.com/u/19599147/CPU.png

author: jeremy
author_rank: Super Contributor
timestamp: April 02, 2016, 03:51:14 am
content: Given that noritake is an OEM, a Japanese company and produces premium spec displays, my guess is that it is an asic. Why are you trying to find out?Pretty sure my other noritake displays have asics

author: mojoe
author_rank: Frequent Contributor
timestamp: April 02, 2016, 04:12:06 am
content: I'm just trying to reverse engineer a display. I have the parallel inputs, but there are indications that there may also be a serial input.

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: April 04, 2016, 01:21:54 pm
content: I thought all noritake displays were serial input? every one I've poked at was just a uart connection sending plain ascii. some char range were control for chaning the upper 128 ascii to japanese from old dos style...

author: macboy
author_rank: Super Contributor
timestamp: April 05, 2016, 03:11:21 pm
content: What is the exact part number of the display? Most support serial (either async or sync or both), some parallel (68k/intel/both), some both. Often there will be an un-populated header and jumpers on the board which might be used for the other interface. Try finding a data sheet for a similar display with the desired interface, then look for evidence of that on your board.

author: mojoe
author_rank: Frequent Contributor
timestamp: April 05, 2016, 09:01:43 pm
content: I've already done all of the above. No datasheet matches this display, which appears to be custom.
Not very ABLE to do ABEL... GAL 16V8 - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: June 16, 2020, 06:05:42 pm
content: I am struggling with my very first GAL design...Code:MODULE test2A15 pin 1;A14 pin 2;A13 pin 4;A12 pin 5;A11 pin 6;ROM_ENABLE_B pin 9;ROM_ENABLE_C pin 11;ROM_ENABLE_D pin 17;ROM_ENABLE_E pin 14;ROM_ENABLE_F pin 13;ROM_CHIP_DISABLEpin 19;H,L,X = 1,0,.X.;Address = [A15,A14,A13,A12, A11,X,X,X, X,X,X,X, X,X,X,X];ROM_RANGE_B, ROM_RANGE_C, ROM_RANGE_D, ROM_RANGE_LOW_E, ROM_RANGE_F node;ROM_RANGE node;ROM_CHIP_ENABLE node;equationsROM_RANGE_B = ((Address >= ^hB000) & (Address <= ^hbfff)) & ROM_ENABLE_B;ROM_RANGE_C = ((Address >= ^hC000) & (Address <= ^hCFFF)) & ROM_ENABLE_C;ROM_RANGE_D = ((Address >= ^hD000) & (Address <= ^hDFFF)) & ROM_ENABLE_D;ROM_RANGE_LOW_E = ((Address >= ^hE000) & (Address <= ^hE7FF)) & ROM_ENABLE_E;ROM_RANGE_F = ((Address >= ^hF000) & (Address <= ^hFFFF)) & ROM_ENABLE_F;ROM_RANGE = ROM_RANGE_B # ROM_RANGE_C # ROM_RANGE_D # ROM_RANGE_LOW_E # ROM_RANGE_F;ROM_CHIP_ENABLE = ROM_RANGE;ROM_CHIP_DISABLE = !ROM_CHIP_ENABLE;ENDThe trouble is that I end up with a design that has the ! of what I wanted...Code:P16V8AS+---------\ /---------+| \ / || ----- |A15 | 1 20 | Vcc| |A14 | 2 19 | !ROM_CHIP_DISABLE| || 3 18 || |A13 | 4 17 | ROM_ENABLE_D| |A12 | 5 16 || |A11 | 6 15 || || 7 14 | ROM_ENABLE_E| || 8 13 | ROM_ENABLE_F| |ROM_ENABLE_B | 9 12 || |GND | 10 11 | ROM_ENABLE_C| || |`---------------------------'i.e. I get !ROM_CHIP_DISABLE on pin 19 but I wanted ROM_CHIP_DISABLEAny clues? something to do with istype? something to do with my assumptions about how a GAL would work!??

author: NivagSwerdna
author_rank: Super Contributor
timestamp: June 16, 2020, 07:47:33 pm
content: I tried something simpler...Code:MODULE test2IN1 pin;IN2 pin;IN3 pin;IN4 pin;OUT1 pin;OUT2 pin;OUT3 pin;OUT4 pin;equationsOUT1 = IN1;OUT2 = IN2;OUT3 = IN3;OUT4 = IN4;ENDand the compiler showed me....Code:P16V8AS+---------\ /---------+| \ / || ----- |IN1 | 1 20 | Vcc| |IN2 | 2 19 | !OUT2| |IN3 | 3 18 | !OUT1| |IN4 | 4 17 || || 5 16 | !OUT4| || 6 15 | !OUT3| || 7 14 || || 8 13 || || 9 12 || |GND | 10 11 || || |`---------------------------'SIGNATURE: N/Awhich looked wrong... but i burnt it into a chip and tried it...so weirdly the outputs don't actually seem to be inverted. Now I am really confused!!!

author: NivagSwerdna
author_rank: Super Contributor
timestamp: June 16, 2020, 11:24:10 pm
content: I think maybe it is actually working... just the "Chip Report" .... "P16V8AS Chip Diagram"... is misleading. Maybe ! means something different there???
NOVA34 – Open Source Ultra Small Linux Board (i.MX 8M Nano) - Page 1
Forum section: electronics / projects

author: silver_fullstack_develope
author_rank: Newbie
timestamp: March 29, 2025, 09:06:09 pm
content: Hi everyone,I’ve been working on NOVA34, an open-source embedded board based on the NXP i.MX 8M Nano. The goal is to create a compact yet powerful solution for advanced embedded applications such as robotics, wearable devices, and custom systems.I chose this SoC because it offers a great balance between performance and power efficiency, making it an interesting option for those who want to go beyond common platforms like ESP32 or Raspberry Pi.🔧 Key SpecificationsProcessor: NXP MIMX8MN5DVPIZAA (i.MX 8M NANO)ComboChip Kingston ePOP TechnologyMemory: LPDDR4X + eMMC 5.1 (Kingston 32EP16-M4FTC32-GA68)Connectivity:Rev 1.0–1.3: RTL8723DS (WiFi + Bluetooth)Final Revision: CYW43012 (Infineon, 106-ball WLBGA)Peripherals:Camera: 5MP, Autofocus, 24 pins, ~110° FOVDisplay: ST0103A2W-WSNLW-F (Santek)IMU: BMI160 (Bosch)Power Management: NXP PCA9450BHNYPCB Size: 34mm x 30.946mm x 1mm💡 Why this project?Many makers start with Arduino and ESP32, but few venture into more advanced projects using BGAs, FPGAs, and next-generation SoCs. I created this board to lower the entry barrier and help hobbyists experiment with more professional hardware.🤔 Questions for the CommunityI’m finalizing Rev.1.3 and would love to get some feedback from experienced embedded engineers:Thermal management: Any optimization tips for heat dissipation on ULTRALIGHT packages (11x11mm, 14nm)?WiFi/Bluetooth choice: Any experience comparing CYW43012 vs. RTL8723DS?Small-scale production: Any design for manufacturing (DFM) advice for low-volume runs (<100 units)?📂 Open Source & ContributionsThe project is fully open-source and available on GitHub:https://github.com/silvioviscuso/nova34I’d love to hear your thoughts and ideas! Thanks in advance for any feedback. 😊
NPN as diode in a boost converter - Page 1
Forum section: electronics / projects

author: ppTRN
author_rank: Regular Contributor
timestamp: April 25, 2025, 06:50:38 pm
content: Hi everyone,I need a boost converter for a nixie tube and I am impementing it as a two stage cascade converter. Both stages will be driven by the same PWM signal.I have all the components to implement the first stage, but I do not have an high voltage diode for the second stage, so I tought I could use an high voltage PNP transistor wired as a diode.Could this work? My concern is that the transistor will blow up due to the high voltage applied to its base.Thanks!

author: PCB.Wiz
author_rank: Super Contributor
timestamp: April 25, 2025, 06:56:11 pm
content: The b-c junction is high voltage, the b-e junction is far lower.Short b-e and use the b-c diode.

author: ppTRN
author_rank: Regular Contributor
timestamp: April 25, 2025, 07:38:36 pm
content: Great, thank you. Tomorrow I will test it
NPN Darlington radiation detector - Page 1
Forum section: electronics / projects

author: Stonent
author_rank: Super Contributor
timestamp: July 13, 2013, 08:51:01 am
content: I'm curious if anyone has built one of these before? It is a radiation detector based on an BC517 NPN Darlington transistor. The way I'm seeing it is the radiation excites the leg and allows voltage.It also shows the "Dave" effect where she stands up and the meter jumps.One of the comments to the video says since the transistor can handle more voltage, she could connect two 9v batteries in series to increase the sensitivity.I'm also wondering about what the signal looks like going into the meter, is it a constant voltage that goes up and down, or with a lot of static where it might be suitable to connect to an amplifier and speaker? It would be interesting to replicate using a scope instead of a DMM.I guess the next time I make a trip to the parts store I'll pick up some of these transistors and try some different things, maybe even figuring out a way to connect it to an ADC pin on an AVR. I'm not sure yet.Based on what you've seen, is the BC517 the best for this or would there be another one which might be even more sensitive?

author: Rerouter
author_rank: Super Contributor
timestamp: July 13, 2013, 09:07:45 am
content: being its an npn, I'm going to guess it only picks up on alpha radiation, (removal of electrons at the base) whereas the addition of electrons from beta could possibly overcome the leakage of a pnp, but unclear,
NPN driving P MOSFET on a chip - Page 1
Forum section: electronics / projects

author: rea5245
author_rank: Frequent Contributor
timestamp: June 13, 2019, 08:22:52 pm
content: Hi,When switching a P-channel MOSFET from a microcontroller, you typically do it through an NPN. It's so common that it would be nice if NPNs and P FETs were packaged together on a chip, sort of like a Darlington transistor. Is there such a beast?Thanks,Bob

author: Yansi
author_rank: Super Contributor
timestamp: June 13, 2019, 08:25:25 pm
content: You haven't done your (googling) homework, have you?There is a metric crapton of high side switches, from the most stupid ones like UDN2981 or BSP450 up to quite smart ones for Automotive (for example VND7020) and Industrial applications (VNI8200XP)//EDIT: Typo

author: rea5245
author_rank: Frequent Contributor
timestamp: June 13, 2019, 08:37:25 pm
content: I googled plenty for NPN driving P MOSFET and I looked on Digi-Key at transistor arrays. What I didn't know was the magic words "high side switch".Thank you.

author: Yansi
author_rank: Super Contributor
timestamp: June 13, 2019, 08:41:02 pm
content: It is likely you could even find N and P mosfet combos in a single package, with various levels of resistor integration.Not sure off-hand about any, haven't used any of those in my designs, but have seen such.

author: rea5245
author_rank: Frequent Contributor
timestamp: June 13, 2019, 09:21:14 pm
content: I wish I could find those combos. I've found theCTA2N1Pbut nothing else. And it's discontinued at Digi-Key, which is a little worrisome. (Mouser still has it though.)

author: Yansi
author_rank: Super Contributor
timestamp: June 13, 2019, 09:36:19 pm
content: There has to be a lot more of those, small signal and medium power.Look for example here:https://cz.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1z0xz4pZ1yrzahtAnd don't get fixated that the low side has to be NPN. N-MOS would be preferred there - less current consumption.
NPN transistor switch circuitry, looks a bit odd. - Page 1
Forum section: electronics / projects

author: Yamin
author_rank: Frequent Contributor
timestamp: May 10, 2020, 06:39:45 pm
content: Hi guys,I came across the following npn transistor circuit in a coffee grinder. The led D1 is the led of a MOC3063. It looks kind of peculiar to me as normally the 'load' this case the led and the resistor would be normally placed on the collector side and I haven't seen the collector tied to ground with these kind of setup before.Something else I noticed was this - the supply voltage is 5.1V (comes from a 5.1V Zener regulator). But measured from the Cathode to ground of D1 the meter shows around 5.6V how can this be?This unit works which means the circuit works, Ltspice simulation also does work apart from the 5.6V measurement. Why might have the designer choose this particular order, might there be an advantage to this approach? Hoping for some more interesting thoughts.Thanks in advance for the help.

author: magic
author_rank: Super Contributor
timestamp: May 10, 2020, 07:28:45 pm
content: By its nature, BJT is somewhat symmetric but not fully symmetric. If you swap collector and emitter it will still work, but with much lower beta and with breakdown voltage typically less than 10V.Probably the designer of this circuit made a mistake, I see no good reason to reverse this transistor deliberately.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 10, 2020, 07:38:06 pm
content: Hi,Check your pin connection on the BJT.The 2N3904 is not the same as BC547.Not all TO-92 transistors are the same.Your coffee grinder circuit make more sense if you switch the collector and emitter.Jay_Diddy_B

author: Zero999
author_rank: Super Contributor
timestamp: May 10, 2020, 10:07:12 pm
content: A multimeter's diode test function can be used to distinguish between the emitter and collector. Connect the anode lead to the base and the cathode to one pin, then the other. The emitter-base junction will have a slightly higher voltage drop, than the collector-base.Another way is to connect the transistor's emitter/collector to a 5V supply, via a 10k resistor and the base to +V, via a 1M resistor. The correct direction should give the lower voltage drop cross the transistor's emitter and collector.

author: Yamin
author_rank: Frequent Contributor
timestamp: May 10, 2020, 10:15:49 pm
content: Hi Guys I have pretty much double checked the circuit and pin outs. Here is the actual PCB layout. I have assumed correctly right?

author: Yamin
author_rank: Frequent Contributor
timestamp: May 10, 2020, 10:20:52 pm
content: Here is the full circuit diagram.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 11, 2020, 01:13:29 am
content: Hi,Is the transistor marked with a part number?It could have this pinout?Jay_Diddy_B
NPS-250KB F Bench Power Conversion - Page 1
Forum section: electronics / projects

author: thomkas
author_rank: Newbie
timestamp: February 24, 2017, 01:57:44 pm
content: Hello World,I have a NPS-250KB F power supply (date code: 0423, rev: 03) out of a Dell Dimesion Tower. I have watched every tutorial and read every article I could about converting this PSU into a bench power supply. I am at my wits end because no matter what I do, I cannot get the darn thing to turn on.So far I have tried the following:Shorted the green "remote" wire to Ground. It is showing 5V when open, 0V when shortedAdded a 10W resistor on the red 5V rail, yellow 12V rail, purple 5VSB rail, and every combination between (5V & 12V, 12V & 5VSB, and 5VSB & 5V & 12V)I have shorted and added a LED with 220ohm resistor on the grey Power good (PG)I have good mains voltage at 120VThe only signs of life I get from the PSU is from the 5VSB rail, it has good power and will heat the 10W resistor.I have a SPST switch with a LED indicator, when I short the remote (green) to ground (black), the indicator LED will turn on.Am I missing something simple?Thank you all,
NRF24L01+ with ADXL345 - Page 1
Forum section: electronics / projects

author: nx084f001
author_rank: Newbie
timestamp: August 27, 2013, 04:07:14 pm
content: Hello.I've got a need for a circuit that will notify me when movement is detected. Let me explain:I want to use two NRF24L01+ transceivers. One for Rx will be attached to my RPi via the RPi GPIO headers.The one for Tx will be attached with (somehow) an accelerometer, perhaps the ADXL345 breakout, and all modules powered by a battery (except for the Rx unless it won't draw from the RPi).When the accelerometer is knocked, the output is fed into the NRF24L01+ (Tx) and sent to the Rx where I have a script running on the RPi to log the values into a MySQL database.Now I don't do much electronics and herein lies my problem; I only have the abstraction of what I'm after making on the Tx side as there are plenty of how-to guides for putting together the these transceivers with the RPi so I have the Rx covered, but I'm out of luck for a similar circuit on the web for Tx.Ideally I will be able to knock together a minimal circuit for Tx. Are any of you able to offer any advice or suggestions?ADXL345:http://item.mobileweb.ebay.co.uk/viewitem?sbk=1&nav=SEARCH&itemId=251298525762NRF24L01+:http://item.mobileweb.ebay.co.uk/viewitem?sbk=1&nav=SEARCH&itemId=140939401129

author: firewalker
author_rank: Super Contributor
timestamp: August 27, 2013, 05:07:25 pm
content: You will need something "smart" (a microcontroller) between the ADXL345 and the NRF24L01+. ADXL345 can't send its data directly ti the NRF24L01+.Alexander.
nRF24l01+ Need feedback and suggestions - Page 1
Forum section: electronics / projects

author: enggricha
author_rank: Newbie
timestamp: May 22, 2014, 07:30:31 am
content: If any of you people have use nRF24l01+PA_LNA modules (see link) I wanted to know about your experiences about the same. I am planning on using the same for a project, but I am yet to test them.http://www.wayengineer.com/mk-nrf24l01palna-v50-for-wireless-data-transmission-module-p-3454.html#.U32nDvmSxFsI have read different sources elsewhere, but none conclusive or clear about them..My requirement is upto 300mts of 115200 Baud communication, with a payload of about 50bytes per transmission. Transmitting multiple frames per second.

author: RABeng224
author_rank: Contributor
timestamp: May 22, 2014, 07:18:14 pm
content: Not sure about the PA but I have worked with the nRF24l01+. It is a great chip. The chip is SPI so you can communicate with it from a host micro up to 20MHz (not sure if this is correct check the datasheet). The largest payload can only be 32 bytes so you will have to split up your 50 byte payload. Multiple frames per second is no problem, even transmitting at 250kbps (max is 2Mbps).

author: true
author_rank: Frequent Contributor
timestamp: May 24, 2014, 05:00:45 am
content: Quote from: RABeng224 on May 22, 2014, 07:18:14 pmThat's great, but not at all what he was asking.Yes, I have used those modules. No, I have not qualified range. My use case is different than yours. But some questions for you that might help others to assist:What kind of antennas are you planning on using?LOS or no?

author: enggricha
author_rank: Newbie
timestamp: May 26, 2014, 11:20:43 am
content: I am planning on using the antennas that come with the modules, rubber ducky? antennas - Dipole antennas basically. LOS - may b may not be, so have to plan for non LOS.@true : what is your application may b there is some take away for me there? BTW I am a "She"... dont blame you, this happens to me all the time. Not sure Y though.

author: enggricha
author_rank: Newbie
timestamp: May 26, 2014, 11:26:37 am
content: Quote from: RABeng224 on May 22, 2014, 07:18:14 pmthanks for that info, i am sure the chip itself is good, was mode concerned about the whole combo of chip+LNA+PA. Also I am gonna use this with UART controller, so will have to put in some sort of a UART to SPI bridge, any experience with those?
NRF24L01p Delay needed - Page 1
Forum section: electronics / projects

author: maurosmartins
author_rank: Regular Contributor
timestamp: July 04, 2014, 03:27:18 pm
content: Hello all,I'm working on a library for NRF24L01+ and PIC micro.Unfortunately there is something wrong. On the receiver side, the micro correctly detects that a packet has been received, and after I try to read the payload.This is where it gets strange! I need to add a delay (please see code below) in order to receive correct data, if I omit the delay, the data gets corrupted.Code:if(bNRFBeeIsDataReady()){Delay10KTCYx(200);temp3=u8NRFGetPayloadPipe();vNRFBeeGetPayload(&stNRFBee);}this delay ( Delay10KTCYx(200); ) corresponds to about 160miliseconds, this doesn't seem ok.Any ideas on why I need this?thanks in advanced, best regards, Mauro.
NRF52 bluetooth nixie watch - Page 1
Forum section: electronics / projects

author: nexus
author_rank: Regular Contributor
timestamp: October 02, 2020, 06:59:37 pm
content: Hi all,I finally began a project which I have wanted to do for years but only recently have gained the skills to attemptThis is a 4 tube, direct drive (non-multiplexed), nixie tube watch featuring the nrf52832 MCU with a few peripherals, such as capacitive touch, low-power accelerometer, USB-C, and a few others. You can see all the pictures (including schematic and artwork) and read about it in detail here:https://neonkev.com/2020/10/02/la-piece-de-resistance-nixie-tube-smart-watch/More updates to come as I wrap my head around the firmware tasks. I am definitely a hardware oriented individual, so it will be quite a challenge in addition to the work that is already done!

author: mayor
author_rank: Regular Contributor
timestamp: October 03, 2020, 10:54:13 am
content: Looks cool - and nice lab!

author: nexus
author_rank: Regular Contributor
timestamp: October 03, 2020, 05:50:19 pm
content: Thanks mayor! Hopefully it will look even cooler once I get the firmware rolling and the tubes lit.Appreciate it. The home lab has come a long way since we've all been under quarantine... at least there's one positive side effect in light of all the recent misery!
NScope - Page 1
Forum section: electronics / projects

author: wblackledg
author_rank: Regular Contributor
timestamp: May 19, 2015, 04:26:23 am
content: found this and had to share.http://nscope.org/

author: rs20
author_rank: Super Contributor
timestamp: May 19, 2015, 04:27:53 am
content: Literally the first result for the google search "eevblog nscope":https://www.eevblog.com/forum/crowd-funded-projects/we-made-a-portable-usb-scope-for-teaching-our-electronics-design-course!/

author: wblackledg
author_rank: Regular Contributor
timestamp: May 19, 2015, 04:34:09 am
content: Quote from: wblackledg on May 19, 2015, 04:26:23 amHere it is. Seems they are fans of the EEVBlog!!!https://www.eevblog.com/forum/crowd-funded-projects/we-made-a-portable-usb-scope-for-teaching-our-electronics-design-course!/
NSK XTAL OSC Pinouts - Page 1
Forum section: electronics / projects

author: VeasMKII
author_rank: Newbie
timestamp: October 10, 2013, 05:50:57 pm
content: Hello fellow EEVBloggers!I've had no luck finding this datasheet online. It claims to be HCMOS/TTL DIL-8, it has four pins.I can't tell if its 3.3v or 5v and what the pin out on the thing is.I've never used a crystal oscillator before so I don't really have any ideas and I don't want to fry it.Anyone have any useful input on this?

author: dannyf
author_rank: Super Contributor
timestamp: October 10, 2013, 06:33:59 pm
content: Starting with the sharp pin at lower left, it is 1 (NC or EN), 4 (lower right, GND), 5 (upper right, Output), and 8 (upper left, Vcc).If you are unsure, just power it up via a 22 - 110ohm resistor to limit the current.Most 3.3v oscillators run at 5v; some 5v oscillators will not run at 3.3v.

author: VeasMKII
author_rank: Newbie
timestamp: October 10, 2013, 07:03:35 pm
content: Brilliant, I've got this oscillating nicelyI think pin one is NC (Not Connected) this leg seems to be a little different. It works from 3.3v to 5v perfectly, cheers

author: dannyf
author_rank: Super Contributor
timestamp: October 10, 2013, 10:18:02 pm
content: That is a typical pin-out for those chips.
NSN 334 Display - Page 1
Forum section: electronics / projects

author: montecri
author_rank: Contributor
timestamp: May 03, 2023, 02:15:35 pm
content: Hello all,Would anyone have the specs for the display on the attached picture?It's sold by a single vendor in my country as "Display NSN 334" and it got my curiosity.Thanks!- Cristiano

author: floobydust
author_rank: Super Contributor
timestamp: May 04, 2023, 03:08:06 am
content: It's a bit odd - 2 digits yet one common anode, displays "+1.8."https://archive.org/details/1977_MOS_LSI_databook/page/n667/mode/2up?q=nsn334

author: montecri
author_rank: Contributor
timestamp: May 04, 2023, 12:04:55 pm
content: Thank you for the info!Yes, odd. The first digit is not even full. Wondering what kind of real-world device this has been used. Anyway, got one very cheap. You never know, right?Quote from: floobydust on May 04, 2023, 03:08:06 am

author: rdl
author_rank: Super Contributor
timestamp: May 04, 2023, 03:07:51 pm
content: For 3 1/2 digits AD chip ICL7107

author: montecri
author_rank: Contributor
timestamp: May 04, 2023, 06:59:53 pm
content: Thanks!How about this 1 1/2 digits display? Have you seen it used somewhere?Quote from: rdl on May 04, 2023, 03:07:51 pm

author: amyk
author_rank: Super Contributor
timestamp: May 04, 2023, 10:24:26 pm
content: Quote from: montecri on May 04, 2023, 06:59:53 pmThis + another 2 digit display (8.8.) makes up 3 1/2 digits.

author: montecri
author_rank: Contributor
timestamp: May 05, 2023, 12:05:04 am
content: Quote from: amyk on May 04, 2023, 10:24:26 pmGotcha!

author: floobydust
author_rank: Super Contributor
timestamp: May 05, 2023, 12:07:52 am
content: Quote from: montecri on May 04, 2023, 06:59:53 pmNational Semiconductor had a huge line of opto-electronics. LED bubble displays, COB modules, LED displays, discrete LED's, clock modules etc.It climaxed in the late 1970's and was a huge failure for some reason. I remember the stuff was crazy expensive, and fierce competition from Monsanto, Fairchild. Guessing their LED chip on board tech NS had was not cost competitive. At some point an exec killed the whole opto-electronic line-up.The products ended up at surplus dealers and I've never seen anything in an actual product. Pity as they were very good quality but not very bright.
NTAG216 "Partitions" - Page 1
Forum section: electronics / projects

author: DivineChaos
author_rank: Regular Contributor
timestamp: March 12, 2016, 05:22:56 pm
content: I have some data that I need to write to an NTAG215 card.I am using a program not created by me, to write the card that also uses encryption keys to encrypt the contents. Using 215 this works fine.I have a need to useNTAG216 cardsin place of the NTAG215 cards and I was given a basic explanation of how to do it here:QuoteMy problem is that I have found no information anywhere regarding creating any amounts of partitions on the NTAG216 or 215 for that matter.If someone could give me an explanation of how to do this, I would be much appreciative. Thank you.
NTC as 1000 °C sensor? - Page 1
Forum section: electronics / projects

author: firewalker
author_rank: Super Contributor
timestamp: December 17, 2019, 02:46:14 pm
content: Yesterday I had to test an automotive EGT (Exhaust Gas Temperature) sensor. Every time I had to test such a sensor it was an RTD type or a Thermocouple.In this case it was a ~150k NTC thermistor. It was behaving as an NTC to be more exact. Negative coefficient and sensitive. The temperatures in the exhaust are almost 1000 °C.Later I confirmed it is a thermistor.I was under the impression that an NTC can;t go that high without being damaged. Is it a special type of thermistor?Alexander.

author: ogden
author_rank: Super Contributor
timestamp: December 17, 2019, 03:09:37 pm
content: There are various types of thermistors:https://www.shibauraelectronics.com/documents/en/products/SD_product_catalog_en_201601.pdf

author: Kleinstein
author_rank: Super Contributor
timestamp: December 17, 2019, 05:19:02 pm
content: How temperature stable the sensor is depends on the material. With the usually large change in resistance with NTCs it usually needs different materials for different ranges anyway. At high temperature that could be the problem that isolation becomes difficult, so one does not like high resistance sensors at high temperature.

author: thermistor-guy
author_rank: Frequent Contributor
timestamp: December 18, 2019, 02:36:33 am
content: Quote from: firewalker on December 17, 2019, 02:46:14 pmThat high a temperature rating is unusual. Glass-encapsulated chip thermistors rated at 300 deg. C are readily available:https://sensing.honeywell.com/135-103FAG-J01-thermistorsSome Silicon-based devices are rated at 500 deg. C:http://www.adsem.com/gpage1.htmlResearch on diamond-based thermistors, apparently stable to 880 deg. C under cycling:https://ieeexplore.ieee.org/document/8695127

author: Gyro
author_rank: Super Contributor
timestamp: December 18, 2019, 09:20:34 am
content: Tungsten has a reasonable temperature coefficient (positive), just a bit higher than Platinum.Maybe you could make use of Tungsten wire on a ceramic former - or even a halogen bulb with quartz envelope?

author: firewalker
author_rank: Super Contributor
timestamp: December 18, 2019, 09:25:35 am
content: Quote from: Gyro on December 18, 2019, 09:20:34 amThis is the "normal" for EGT sensors in cars. Tungsten or Platinum RTDs. Also N-type thermocouples are used (mainly as after market solutions). It was the first time I came across an NTC.

author: Nauris
author_rank: Regular Contributor
timestamp: December 18, 2019, 04:35:47 pm
content: Many ceramics and glasses start to be conductive at that sort of temperatures, it is certainly possible to make NTC-temp sensor if one selects a suitable one. I can imagine for example piece of silicon carbide working fine in this application.

author: rvalente
author_rank: Frequent Contributor
timestamp: December 19, 2019, 09:49:08 am
content: This catalog has some information on characteristics for egt sensorshttps://www.mte-thomson.com.br/wp-content/uploads/2019/09/13th-Edition-EGTS-MTE-THOMSON.pdf
NTC in a phone battery - Page 1
Forum section: electronics / projects

author: Teun
author_rank: Regular Contributor
timestamp: August 20, 2021, 08:10:49 am
content: Hi Guys,I'm making a battery charger. Now I was looking at 2 existing chargers for this battery and they have the following pin labels:So the right one should be the NTC.But when I measure the resistance on the battery the two on the right are shorted and the two middle ones give a +/-2k4 resistance.Am I right to assume the ID and NTC pins are switched?

author: Dave
author_rank: Super Contributor
timestamp: August 20, 2021, 05:39:56 pm
content: The right one is marked NFC, so I'm guessing that Samsung decided to integrate the NFC antenna into the battery itself. That would explain why you measure a low resistance there.

author: Renate
author_rank: Super Contributor
timestamp: August 20, 2021, 06:41:51 pm
content: I would think that if 3-4 looks basically open circuit that it's not NFC.It's also not a resistance, so not any type of thermistor.Maybe a temperature sensor (TS) like some sort of one wire protocol?

author: Teun
author_rank: Regular Contributor
timestamp: September 13, 2021, 09:23:57 am
content: I've opened up the battery. It seems to be a regular 2k4 resistor, no thermistor.There's 2 smd chips which I think are WDFN-6 packages. Can't read the numbers completely.I think it roughly follows this schematic:And the ID and NFC contacts seem to be connected like this:* And ID to B- with a 2k4 resistorSo is there a temperature sensor in this battery at all?

author: LoveLaika
author_rank: Frequent Contributor
timestamp: September 14, 2021, 06:17:01 pm
content: Perhaps this is old news, but my Galaxy S4's battery seemed to do that, at least that was what I was old by the old cell phone guy I went to for help. That's why their battery costs so much. They integrated something into the battery for some reason. I don't quite remember what.
NTC precision and understanding basic datasheets - Page 1
Forum section: electronics / projects

author: thexeno
author_rank: Regular Contributor
timestamp: October 16, 2017, 08:28:41 am
content: Hi all,I've started to play again with NTCs, while the last time I have used the NTCLE100E3 series, which provides a very helpful datasheet, from where I learned and verified quite a bit of stuff, specially in terms of worst case error and also thankfully to the forum.Now, I was playing with hotplate of 3D printers and realized the need to buy one. Many of them are sold with a NTC, but it is without any datahseet, with a given Beta factor and a given resistance at 25°C. So I started to dig around on what is it possible to achieve with such limited data. But this led me to another, more fondamental problem.Explaining better. In a measurement environment, neglecting any error related to a voltage divider and an ADC acquisition and focusing only on the NTC resistance itself and the temperature, I learned that I can obtain easily the temperature error from the Beta characterization, i.e. beta and its tolerance and the error on R due to such Beta, where all of such data is given in the datasheet:and the final temperature error is defined from:So that I can estimate the worst case scenario for my given range, with no calibration and have the sensor replaceable, since I defined the worst case tolerance.But then I discovered other NTCs, like the NTCS0402E3 serie or other similar. They are providing the resistance error and the Beta error, with no TCR (Alpha, the punctual temperature coefficient). I have couple of problems: how to define the resistor error due to the beta error, and how to devise the TCR from the Beta curve, so that in the end I can find the worst case error.Hope my problem makes sense to any of you. The only thing that I found where they mentions how to use the Beta tolerance is in this application notehttps://www.vishay.com/docs/29053/ntcintro.pdf, where is mentioning something here:But when I try calculations with data of the complete NTCLE100E3 datasheet, it does not make any sense what I am obtain. Actually it is not even the TCR, but the tolerance of TCR. If this is true, the "only" steps missing are the conversion of the TCR tolerance to a temperature/resistor reading and their relative tolerances.
NTC Thermistor as variable offset for a Non-Inverting opamp - Page 1
Forum section: electronics / projects

author: maminej
author_rank: Newbie
timestamp: July 24, 2017, 07:57:30 pm
content: Thanks

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 24, 2017, 09:52:22 pm
content: Offset can be introduced by bleeding a little current into one of the amplifier input nodes.Tim
NTC Thermistor noise disturbance from Mosfet - Page 1
Forum section: electronics / projects

author: funnyKedougou
author_rank: Newbie
timestamp: February 26, 2021, 12:18:18 pm
content: Hello, I am new in this community and I am glad to a membre.Actually I have a problem since almost 1 mouth. Please see the views attached. The goal is to drive a Brushless motor.The NTC thermistor very close to 6xMosfets returns wrong values due to disturbance coming from MOSFET or may be from others close drivers (eg ADC). Please see the views attached.I tried to create a filter by changing the C105 value from 10n to 400n or adding a 10k R to create a PI RC filter. But noise reduced but stay high.Please can someone give some fresh ideas ?Thanks

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 26, 2021, 12:33:55 pm
content: That is high frequency. Do you know that the MCU is actually reading it in error?It may be common mode. Show layout and probing setup.Tim
NTE Electronics gone - Page 1
Forum section: electronics / projects

author: Technotronic
author_rank: Contributor
timestamp: September 04, 2024, 02:21:04 pm
content: Website is offline for good.Anyone have any of their QuikCross 2020, 2022 installersfor Win?They use to have a webform to fill out and a download link was supplied,seems they ran on multiple platforms.

author: bostonman
author_rank: Super Contributor
timestamp: September 04, 2024, 05:30:22 pm
content: I haven't purchased an NTE product in years. An electronics store that went out of business years ago in the area sold NTE, and, at the time, thought that was the only way to replace components.My guess is they went out of business because many more types of components exist in various packages, so they couldn't keep up.Most likely you're better off just buying from online places like Digikey and Mouser.

author: amyk
author_rank: Super Contributor
timestamp: September 05, 2024, 12:34:58 am
content: https://www.electronicoscaldas.com/datasheet/NTE/qc2020v1.zip

author: tooki
author_rank: Super Contributor
timestamp: September 08, 2024, 11:50:44 pm
content: FYI:https://www.eevblog.com/forum/chat/nte-electronics-gone-tits-up/msg5618637/
"NTK9008": anyone has the datasheet? - Page 1
Forum section: electronics / projects

author: DiTBho
author_rank: Super Contributor
timestamp: April 18, 2021, 02:57:17 pm
content: hiYesterday a friend sent me a dozen NTK9008 transistor (or mosfet? or IGBT?) components.I Googled a lot but I cannot find the datasheet.Does anyone happen to have it?

author: wraper
author_rank: Unknown
timestamp: April 18, 2021, 03:12:29 pm
content: Quote from: blueskull on April 18, 2021, 03:08:08 pmDoubt about this part. MOSFET in 50s (invented in 1959), not to say in TO-3P package?
NTP server on esp32 and clock synchronization - Page 1
Forum section: electronics / projects

author: sylvanoMTL
author_rank: Contributor
timestamp: April 30, 2025, 05:11:32 pm
content: Hi,I want to implement clock synchronisation between esp32 client and esp32 server. I would require the synchronisation to be +/-50msI was looking at the following infrastructure:* NTP Server + GNSS + RTC (DS3232) : get world time to 1s (or greater?). Wifi access point- on boot retrieve time from GNSS or RTC- NTP server accessible to remote client- set as master- if slave request synchronisation, then send request to slave 1- get clock synch from slave 1 and redistribute to other slaves* NTP Client #1- on boot retrieve time from NTP Server- Correct the time by millis() to get the time down to ms- check number of clients connected,if none, set as slave=1,if not none, set as slave = 2,3,4,....- If master send clock sync, then broadcast timestamp* NTP Client #2- on boot retrieve time from NTP Server- Correct the time by millis() to get the time down to ms- check number of clients connected- Send clock synchronisation request to server- get clock synchronisation- compensate the timestampI am not sure it is the correct way to do. My goal is to have multiple wireless sensors streaming data with the same timestamp so they can be compared together by a real time analysing program

author: xvr
author_rank: Frequent Contributor
timestamp: May 01, 2025, 03:29:52 pm
content: NTP server is a fully passive thing - it not send any sync to any clients.NTP client request time from NTP server. They do not interact with other NTP clients (only Client to Server)NTP clients request time from NTP server at start and could periodically resynchoronized with it later (in minutes or even hours). Between synch they use RTC or local timer to keep current timestamp.

author: madires
author_rank: Super Contributor
timestamp: May 01, 2025, 03:42:21 pm
content: Quote from: xvr on May 01, 2025, 03:29:52 pm... in normal (unicast) mode. In multicast mode it sends sync messages to a multicast address (group). And in broadcast mode it sends sync messages to a local subnet.

author: ledtester
author_rank: Super Contributor
timestamp: May 01, 2025, 05:37:36 pm
content: Look into using TSF from your wireless access point:https://www.reddit.com/r/esp32/comments/1b1g7rl/clock_syncronization_between_two_esp32_over_wifi/

author: sylvanoMTL
author_rank: Contributor
timestamp: May 02, 2025, 12:53:16 pm
content: that link sounds good.It looks like I need the AP with GPS to get the time, then use the TSF function.I cannot see any example that uses the function: esp_wifi_get_tsf_time( )Any help on this would be great
Ntp server pps signal - Page 1
Forum section: electronics / projects

author: Charlie86
author_rank: Regular Contributor
timestamp: March 30, 2021, 05:48:17 pm
content: Hi,I am building NTP server with Raspberry Pi.I have a GPS boardhttps://www.waveshare.com/l76x-gps-hat.htmIt have PPS LED but no output on I/O pins for Raspberry.My question is: can I connect PPS signal directly from LED to raspberry?Something simular then this guy did?https://robrobinette.com/pi_GPS_PPS_Time_Server.htm

author: floobydust
author_rank: Super Contributor
timestamp: March 30, 2021, 07:28:30 pm
content: yes I would say you can run a wire from the GPS module 1PPS output to the RPi GPIO. Both are 3.3V logic.The L76X GPS Hat 1PPS LED comes after its resistor so that will not work, you need the other end of R9. So connect the wire right to the GPS module or other end (not LED) of R9.

author: geggi1
author_rank: Frequent Contributor
timestamp: March 30, 2021, 08:04:26 pm
content: you should consider putting a buffer in between. It can be something like a 3,3v cmos dual and gate with the input pins in paralell. If needed the other gates in the chip can be used as additional PPS outputs for other use,
Nuclear-chicago mediac dose calibrator radioactive counter test teardown - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: September 11, 2022, 08:22:46 am
content: I really love old Nixie tube equipment, and high voltage, and medical,all 3 cool things in one video :-)https://youtu.be/oyfFt5gC2e0
Number of people inside a store = ? - Page 1
Forum section: electronics / projects

author: Lucky-Luka
author_rank: Unknown
timestamp: April 27, 2020, 08:57:44 pm
content: Hi allDo you have an idea how I can check the number of people that go inside and go outside a single door store? I need to know how many people are inside. I would like to use Arduino. It's a project related to covid19 safety measures: not more than x number of people inside a y m^2 space.Thanks

author: Rerouter
author_rank: Super Contributor
timestamp: April 27, 2020, 09:04:37 pm
content: The usual approach is line break sensors, atleast 2 with an offset to tell direction, however unless you have a store with a forced entry and exit path and place the sensors where people do not stall, you will have to have a means of compensating for missed and extra counts.Depending on the store may be easier to supply a staff member at the counter with an up/down click counter.

author: Kleinstein
author_rank: Super Contributor
timestamp: April 28, 2020, 07:29:49 am
content: The sensor may not work absolute reliable, e.g. counting legs / arms instead of people. So one would need means to correct (e.g. manually), possibly more than the natural one from negative numbers.
NUVOTON NCT5572 management IC Pinout needed please - Page 1
Forum section: electronics / projects

author: Fraser
author_rank: Super Contributor
timestamp: February 26, 2016, 03:54:08 pm
content: Hi,I am repairing a Dell One AIO computer model 2205 and need to track down a datasheet or pinout for the management IC, type NCT5572D. It is made by NUVOTON but no information is available from them. Other motherboards such as the ASRock E350M1 use the same chip but I have yet to find one that has schematics available.I have found datasheet a for other similar chips but sadly the pinout a are different (NCT5571 etc)Sadly the schematics for the Dell 2205 do not appear to be available. It uses the 'MINK' motherboard made by Wistron Taiwan.A word of advice, do not buy one of these computers. They are flawed at the design level with poor cooling and the motherboard build quality is pretty nasty when compared to other Dell computers that I have worked on.If any one can assist, it would be much appreciated.Fraser
NV3050DV variable attenuator - Page 1
Forum section: electronics / projects

author: TimFox
author_rank: Super Contributor
timestamp: July 06, 2021, 02:47:50 am
content: I have a few NEC "NEOVAT" NV3050DV parts, which I believe are screw-adjust 50 ohm attenuators, in a DIP-like package.They seem to be very obsolete, with date-code 8514, with no information found by Google.Does anyone have information on this part?

author: TimFox
author_rank: Super Contributor
timestamp: July 06, 2021, 08:18:41 pm
content: I measured pin-to-pin resistances to determine that pins 3 and 4 (nearer the adjustment screw) are common (ground), and that pins 1 and 2 (nearer the reference notch) are (interchangeably) input and output for a 50attenuator. Measuring attenuation at DC, with a 50termination, there are approximately 8 turns from CCW (0 dB attenuation) to CW (12 dB attenuation). I was hoping someone had the manufacturer's ratings for power and frequency range.Before I retired, younger folk at work told me there was no need to retain data books or sheets since absolutely everything was online.