hybridfree/eevblog-posts huggingface dataset:
nspire cx cas usb problem.. - Page 1
Forum section: electronics / beginners

author: ammjy
author_rank: Regular Contributor
timestamp: May 02, 2018, 02:10:30 pm
content: Hello !Thanks you for click.today when i connect usb cable to my ti nspire cx cas.led turned on few micro second and cx cas os automatically restarted. cx cas have two color led around usb port.maybe, this kind of product have protect circuit ? kind of zener or tvs.i just worry about it.because my nspire is almost new. i dont carry normally. i handling always like a real egg.still fucntions fine. good.but i just worry. today happend problem is feels like short to me. owww....
NTC thermister question - Page 1
Forum section: electronics / beginners

author: Jbates58
author_rank: Regular Contributor
timestamp: September 23, 2016, 12:25:01 pm
content: hi alli am soon getting some new gauges for my 4x4, and they have support for an external temperature sensor. however, it is about $95, and i dont realy want to pay that if i can just roll my own.i know that they are a NTC, and i have an idea on how they work and what not. but i am unsure if you just "buy a thermistor" or if there are different vailes etc.. that i would need to look into.i know that there is different types like glass encapulated and disc etc... but i dont know if there are different ratings.Jason

author: Simon
author_rank: Unknown
timestamp: September 23, 2016, 12:26:34 pm
content: You need to know the temperature at 25C (or other declared temperature) and you need to know the Beta value, these two things fully define it's response.

author: Jbates58
author_rank: Regular Contributor
timestamp: September 23, 2016, 12:39:54 pm
content: hmmm ok, is there a "most common" used component that i could try? or if i have the gauge, can i test it to determine what its expecting? or is it just not worth the effort, and i should just part with the $95?Jason

author: Simon
author_rank: Unknown
timestamp: September 23, 2016, 01:02:54 pm
content: Depends on the acuracy you want. many thermistors tend to be 10K @25C I don't know what the usual beta is, I think 3000-5000 is common.

author: Zbig
author_rank: Frequent Contributor
timestamp: September 23, 2016, 01:15:30 pm
content: Automotive environment is rather hostile to electronics. Off-road even more so. Be sure to adequately protect it from water, contamination, etc. I'm pretty sure that good chunk of these $95 they call for the original ones went into that.

author: Simon
author_rank: Unknown
timestamp: September 23, 2016, 01:20:09 pm
content: Quote from: Zbig on September 23, 2016, 01:15:30 pmNo, I'd say it's more a case of, "we know what you need but you don't". You can buy thermistors on a cable for under £10

author: rvalente
author_rank: Frequent Contributor
timestamp: July 03, 2017, 10:42:02 pm
content: If you are still up to this project, I`m doing pretty much the same as you, gauges for my 4WD.I'm from Brazil, them I picked common parts catalog for temp sensors, MTE Thomson (they're based in BR and US). Picked the most common part from their catalog, MTE4051, used in various cars from 90s, called them and asked for some temp points, did some other research on web, found out the R25° is 2080R and B25/100 is 3650R.So you could follow the same idea, check the commonest sensor for the cars in your are and some reverse engineering will get you there.
NTC Thermister Resistance Drift? - Page 1
Forum section: electronics / beginners

author: The3DE
author_rank: Newbie
timestamp: June 23, 2019, 11:37:28 pm
content: I had used a 10k ntc thermister for measure the temperature of hot water (~50-70C) for extended periods of time (~30min), leaving the thermister in the water. Now, a few months later, the thermister has a resistance of ~18k at room temperature. I checked another unused thermister from the same batch and it still had a normal resistance of 10k at room temperature. The thermister still works; when I heat it up, the resistance still drops. Is the thermister still usable? Normally it is used in a voltage divider with a 10k resistor but if I changed it to a 18k resistor, would it still work/ be accurate? Also, why would the resistance of it change?Thanks

author: Cliff Matthews
author_rank: Unknown
timestamp: June 24, 2019, 12:20:17 am
content: Is this part resistant to water ingress?

author: The3DE
author_rank: Newbie
timestamp: June 24, 2019, 04:41:42 am
content: I'm not sure but it's an extremely cheap part from Ebay. Just a black blob with 2 leads. I tested it more and it seems to have a resistance of about 20k at 25C. There is rust on one lead though. It was delivering pretty accurate values when it was in use. I'm was using it with a micro controller (Arduino) to calculate the temperature using the Steinhart and Hart Equation, but now that somethings changed, idk if it still works with the same beta coefficient. I don't really need the part; I have extras and don't have that much use for them right now. I'm just curious about why it changed and the reliability of this type of thermistor. Also, the thermistor hasn't been in use for a couple months, just to clarify. I only used it for a few days a while back.

author: Gyro
author_rank: Super Contributor
timestamp: June 24, 2019, 08:42:18 am
content: Unless the water was distilled or de-ionized or the leads completely waterproofed, you would have had electrolysis happening between the leads (and connections?). That would have changed the apparent resistance in the water.If water vapour made it into the thermistor package, then the same thing would have been happening internally, possibly causing a permanent change in characteristics.
NTC triggered digital input of a MCU - Page 1
Forum section: electronics / beginners

author: kalosbg
author_rank: Newbie
timestamp: May 10, 2022, 02:36:11 pm
content: Hello,I'm looking for a simple solution for the following scenario.I have a device with a tactile switch that is pulled up (3.3V). The switch output is monitored by some MCU and the MCU detects the switch on release.I should find a way to replace the switch with an NTC in order to detect relatively quick temperature increases (detection of flame).I've tried to connect the NTC directly to the switch but nothing happened because the MCU detects the rising edge.Could you please suggest to me how I can achieve the described above?Regards,

author: ledtester
author_rank: Super Contributor
timestamp: May 10, 2022, 03:07:31 pm
content: Quote from: kalosbg on May 10, 2022, 02:36:11 pmI'd try using the thermistor in a voltage divider like this:As the temp increases the voltage at the GPIO pin increases because Rthermistor becomes smaller.A problem with this approach is that the trigger point isn't well defined and can be different for different copies of the same MCU (or even different GPIO pins on the same MCU). It would be better to use a comparator to remove this variation.Here's a video showing how to use an LM393 with a thermistor to create a high-temperature alarm. You can use that circuit -- remove the transistor and buzzer and connect the GPIO pin to the output of the LM393. Keep the 4.7K resistor on the output of the LM393.High temperature alarm electronics circuit step by step build LM393 comparator NTC thermistor buzzerhttps://youtu.be/cOy4064ONtc

author: themadhippy
author_rank: Super Contributor
timestamp: May 10, 2022, 03:11:48 pm
content: maybe a job for a schmitt-triggerhttps://howtomechatronics.com/how-it-works/electrical-engineering/schmitt-trigger/

author: kalosbg
author_rank: Newbie
timestamp: May 10, 2022, 05:59:18 pm
content: Thank you both for the suggestions, I thing schmitt-trigger and a capacitor should do the jobI will play a little bit to test.Regards,

author: MikeK
author_rank: Super Contributor
timestamp: May 10, 2022, 06:32:22 pm
content: Quote from: ledtester on May 10, 2022, 03:07:31 pmThat link didn't work for me, but this one does:
NTSC to Digital - Page 1
Forum section: electronics / beginners

author: Oanu
author_rank: Newbie
timestamp: May 18, 2015, 12:54:46 am
content: Hello everyone,I want to drive an tft lcd panel from the composite video output of a raspberry pi. My current plan is to use a video decoder such ashttp://www.ti.com/product/tvp5150am1to get the video from an analog into a digital format, then use an FPGA to drive the lcd (the lcd uses a 24-bit data bus with a clock, h-sync, and v-sync).I was wondering if there were any other options for converting the analog video signal into a digital format. All of the video decoder IC's that I've found have an ITU-R BT.656 output format (or similar).Thanks!

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 18, 2015, 01:34:34 am
content: There are single-chip solutions for composite video to LVDS signals (which most LCD panels use).Do you have the specifications for your LCD panel?Ben Heck made a video about creating an LCD driver from an FPGA which you might find interesting.https://youtu.be/DIIjVSmbtFcComplete LCD driver boards, ready to connect and power-up are available at such low prices it is hardly worth trying to DIY, unless you are doing it as a learning exercise or something. For example:http://www.ebay.com/itm/MT6820-B-Universal-LVDS-LCD-Monitor-Driver-Controller-Board-5V-10-42-New-/251718670943

author: Oanu
author_rank: Newbie
timestamp: May 18, 2015, 04:06:43 am
content: Thanks for linking that video, I'll check it out.The reason for not going for an off-the-shelf driver board is that I want to have the lcd driver on the pcb with the rest of the circuit to keep the size down.It's a 24-bit parallel RGB interface. Something like this (but probably not this exactly):http://www.newhavendisplay.com/specs/NHD-4.3-480272EF-ATXL.pdf
NUD3112LT1G replacement - Page 1
Forum section: electronics / beginners

author: Thomas83
author_rank: Contributor
timestamp: January 26, 2023, 10:56:16 am
content: Hi everyone,I am looking for an equivalent component for NUD3112LT1G.Any help.Thanks

author: Zero999
author_rank: Super Contributor
timestamp: January 27, 2023, 06:12:57 pm
content: It can be replaced with discrete MOSFETs, resistors and TVS diodes. The schematic is on the data sheet.https://www.onsemi.com/pdf/datasheet/nud3112-d.pdf

author: bidrohini
author_rank: Regular Contributor
timestamp: January 28, 2023, 10:22:21 am
content: The NUD3112LT1G is a dual N-channel MOSFET manufactured by ON Semiconductor. As an equivalent component, you can use other dual N-channel MOSFETs with similar specifications and from reputable manufacturers such as:IRLML2402TRPBF from Infineon TechnologiesSi2301DS from Vishay IntertechnologyBSS138LT1G from ON Semiconductor2N7002KTFR from Fairchild SemiconductorPlease note that it is always important to check the datasheet and confirm that the specifications of the equivalent component meet the requirements of your application.
Null detector with MCU - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: November 27, 2014, 01:36:43 pm
content: Problem:1. I have to make a null detector with MCU.2. Input voltage maximum is 30V dc.3. Current to detect is 1nA to 300mA.4. Galvanometer resistor selected is 100ohm. As this is standard in many analog null detector I have. And it also limits the current through power supply in case two opposite are zero & other two are open. In this case entire 30V will appear across 100 ohm.5. I have selected Max9918 for this purpose.6. Current measured should be bidirectional.My solution:1. I have divided ranges into 5 parts, 1nA-500nA , 500nA - 1000nA , 1uA-500uA , 500uA-1000uA , 1mA-300mA.2. I have 100ohm galvanometer resistance into two parts. Reason is described later.3. Max9918 has sense range of 50mV full.4. For 1nA-500nA, Rsense = 50+50ohm = 100ohmSo input range = 0.1uV - 50uV. Gain = 40000.So R9 = 39K & R10 = 1K.So ouput for +ve current is 2.5V - 4.5V& output for -ve current is 0.5V-2.5V.5. For 500nA-1000nA, Rsense = 50+50ohm = 100ohmSo input range = 50uV - 100uV. Gain = 20000.So R9 = 19K & R10 = 1K.So ouput for +ve current is 3.5V - 4.5V& output for -ve current is 1.5V-2.5V.6. For 1uA-500uA, Rsense = 50ohmSo input range = 100uV - 50mV. Gain = 40.So R9 = 39 & R10 = 1.So ouput for +ve current is 2.5V - 4.5V& output for -ve current is 0.5V-2.5V.7. For 500uA-1000uA, Rsense = 50ohmSo input range = 25mV - 50mV. Gain = 40.So R9 = 39 & R10 = 1.So ouput for +ve current is 3.5V - 4.5V& output for -ve current is 1.5V-2.5V.8. For 1mA-300mA, still working on it.I will add a small sense resistor in series with two 50ohm resistors.Feedback/comments/suggestions:1. Is it right method to do.I am starter in analog field. So don't know if it will work. Theoretically it seems.practically I haven't included noise of max9918. I am reading the datsheet/opamp book to understand better.2. I was looking for simualtor for Max9918. So that i check on simulator before actual circuit. I found thishttp://www.maximintegrated.com/en/design/tools/modeling-simulation/pspice/MAX9918.FAMBut how to use it.3. Any suggestions on it.4. I have attached my datasheet & circuit.5. Am I disobeying CMVR here.On interent I read it is V1+V2/ 2 .
Nvidia Jetson Wifi Card - Page 1
Forum section: electronics / beginners

author: MuhScopeBroke
author_rank: Contributor
timestamp: March 23, 2021, 01:39:17 am
content: My nvidia jetson nano crashes every time I try to connect to wifi with an Intel AX200 wifi card with the drivers installed. Have tried reinstalling OS but it has not helped. Not sure if this is related or not, but when the device restarts and is connected to an external monitor, the screen flickers on and off until I unplug and plug the HDMI cable back in.If anyone has used a Wifi card with an Nvidia Jetson, please let me know what model. I am ready to give up on this one if thats the problem

author: JustMeHere
author_rank: Frequent Contributor
timestamp: March 23, 2021, 04:55:16 am
content: Maybe you're browning out. Do you have enough power?

author: MuhScopeBroke
author_rank: Contributor
timestamp: March 23, 2021, 12:36:38 pm
content: I'm using wall power through a micro-USB :/

author: rstofer
author_rank: Super Contributor
timestamp: March 23, 2021, 02:43:56 pm
content: You probably don't have enough power. Supplying power through the microUSB is only workable when there are no peripherals and the power mode is set to 'wimpy' (I forget the actual nomenclature).You might try something like this:https://www.amazon.com/gp/product/B01N4HYWAMDon't forget the power jumper at J48. It is usually dangling off one pin and looks for all the world like it is installed. It isn't installed by default.I am using an EDI USB WiFi dongle but I do have the Waveshare AC8265. I'm not ready to deal with the dangling antennas at the moment.https://www.amazon.com/gp/product/B07SGDRG34

author: JustMeHere
author_rank: Frequent Contributor
timestamp: March 23, 2021, 08:43:23 pm
content: It looks like you need a "dumb" micro usb that can supply at least 5V 3A. Not sure if you have a barrel plug on yours. I've seen photos of both. Go with that as mentioned above.
NVRAM manufacturing date - Page 1
Forum section: electronics / beginners

author: klaus11
author_rank: Unknown
timestamp: March 01, 2016, 03:20:08 pm
content: Hi, Today I received two DS1230Y-150 with code (C 1037 358 079), it is possible to know whether they are fresh?

author: rf+tech
author_rank: Frequent Contributor
timestamp: March 01, 2016, 04:24:56 pm
content: Hello klaus11,A photo would be best as other clues may be revealed.My guess the date code is 1037 - 37th week of 2010.Provided the DS1230Y have not been previously installed into a system, then the "freshness seal" is still good. It is not unusual for the lithium battery to last much longer than 10 years. But we do not know the conditions of storage for the past five years. This is only a guess, there is a possibility that the full 10 year data retention may not be met. Is five to seven years acceptable?DS1230Y datasheet link from Maxim:http://datasheets.maximintegrated.com/en/ds/DS1230AB-DS1230Y.pdfRF+ Tech

author: klaus11
author_rank: Unknown
timestamp: March 01, 2016, 09:04:04 pm
content: Thank, I also think they are not new and some old. I hate buying components on Ebay.
NXP i.MX 6 Hardware Reference - Page 1
Forum section: electronics / beginners

author: tarun172
author_rank: Regular Contributor
timestamp: December 15, 2023, 08:18:51 pm
content: Hi,I've recently taken on an assignment that requires working with i.MX 5 and i.MX 6 processor-based hardware designs. While navigating the NXP website, I found at times, information is scattered and confusing. I located hardware guidelines and related information, but I was looking for a book or guide. Can anyone recommend a specific guideline or book that I can use as a reference for NXP i.MX based processor designs?Below is the list that I have read so far for i.MX 61. i.MX 6Dual/6Quad Applications Processors for Industrial Products - Data Sheet2. i.MX 6Dual/6Quad Applications Processor Reference Manual3. IMX6DQ6SDLHDG, Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processors. This seems to have a lot of information.4. Common Hardware Design for i.MX 6Dual/6Quad and i.MX 6Solo/6DualLite.5. Configuring USB on i.MX 6 Series Processors.7. AN4671, i.MX 6 Series HDMI Test Method for Eye Pattern and Electrical Characteristics - Application Notes8. i.MX 6Dual/6Quad Power Consumption Measurement9. Chip Errata for the i.MX 6Dual/6Quad and i.MX 6DualPlus/6QuadPlus - IMX6DQCEThe above list is about the same for i.MX 5

author: coromonadalix
author_rank: Super Contributor
timestamp: December 16, 2023, 10:57:20 pm
content: emptied

author: TC
author_rank: Contributor
timestamp: December 17, 2023, 02:13:07 am
content: Take a look at the ARM website for technical documentation on the processor core... ARM Cortex A9 for the i.MX6 if I remember correctly. I think the ARM website of interest is developer.arm.com/processors ... or something close to that.
Nylon covered capacitors  - Page 1
Forum section: electronics / beginners

author: animalbeats
author_rank: Newbie
timestamp: April 07, 2017, 02:52:41 pm
content: Hi FolksI've got an electronic drum machine which contains capacitors covered by nylon, over the board there is a thin metal sheet of some kind.Why are the capacitors covered in this Nylon?ThanksGordon

author: Totalsolutions
author_rank: Contributor
timestamp: April 07, 2017, 03:03:33 pm
content: Anti vibration to stop them falling.Sent from my GT-N7100 using Tapatalk

author: Totalsolutions
author_rank: Contributor
timestamp: April 07, 2017, 03:04:46 pm
content: Renew and use silicon or sealastic to hold down, or don't hit the drum so hard.Sent from my GT-N7100 using Tapatalk

author: Zero999
author_rank: Super Contributor
timestamp: April 07, 2017, 03:14:40 pm
content: I can't see anything which looks like nylon near the capacitors in that picture. The black tape near the capacitors and connector appears to be PVC electrical tape.

author: animalbeats
author_rank: Newbie
timestamp: April 07, 2017, 03:31:27 pm
content: Yes it is PVC tape on investigation.The tape is not attached to the board, so I cannot see how it would be very anti-vibration.Is it insulating from the covering metal sheath, but then why only those, their not the biggest on the board?

author: SeanB
author_rank: Super Contributor
timestamp: April 07, 2017, 05:26:59 pm
content: I would guess that is the point where the flex in the metal cover is the greatest, and this tape was added so the metal does not touch the capacitors and cause distortion from partly shorting out the cases of them to the chassis. As there is a FFC interconnect there this also stops it rubbing against the capacitors, acting as dual purpose as well, or the tape was originally intended to hold the FFC to the chassis instead, and was placed there instead.
OBD 2  Interface - Page 1
Forum section: electronics / beginners

author: dope40
author_rank: Newbie
timestamp: August 29, 2014, 09:16:46 am
content: Hi , so i am looking at ELM327 and was wondering if its possible to communicate to it using PIC and displaying it on a 16x2 LCD ( for example RPM and VSS ). I know how to display it to the LCD , but i dont know how to send the PID to the ELM and read it . I am new to the MCU world so pls be patient.Thanks in advance.

author: Pedram
author_rank: Regular Contributor
timestamp: August 29, 2014, 09:44:38 am
content: ELM317 is a rebranded PIC it self.it is possible. ELM317 uses AT Commends over UART. so any MCU with UART can communicate with it.

author: Stonent
author_rank: Super Contributor
timestamp: August 29, 2014, 11:32:35 am
content: Another option is Bluetooth. Get a BT based dongle and a BT based device for the microcontroller.If you want to do just parts obd solutions sells the stn1110 based on a pic24 which is command compatible with the elm327 and has more features.For either one, you will also need an mcp2551 CAN controller or similar.
OBD-II Service 0x01, PID 0x02 response.  - Page 1
Forum section: electronics / beginners

author: firewalker
author_rank: Super Contributor
timestamp: September 16, 2018, 07:05:02 pm
content: Does anyone know what the two byte response for the Freeze DTC command contain? I am not able to find any infos.Alexander.

author: mikerj
author_rank: Super Contributor
timestamp: September 17, 2018, 05:43:54 pm
content: PID 02 returns the trouble code that triggered the storing of freeze frame data.

author: firewalker
author_rank: Super Contributor
timestamp: September 17, 2018, 05:47:06 pm
content: Same as Servise $02 PID $02?Alexander.

author: HwAoRrDk
author_rank: Super Contributor
timestamp: September 17, 2018, 05:50:19 pm
content: Yes, it is described in the ISO standards document as"DTC that caused required freeze frame data storage", and the two-byte value should be interpreted as a DTC value just as per service 0x03. See further on in theWikipedia articleyou showed an excerpt from for how to decode.If the returned value is 0x0000, then that indicates there is no freeze-frame data.
OBD Signal breakout box - Page 1
Forum section: electronics / beginners

author: Mute
author_rank: Newbie
timestamp: February 13, 2014, 03:14:49 pm
content: First post, hello!I want to make it easy to hook up my scope to the OBD adapter in my car, while a computer is connected. Cutting an OBD2 extension lead, soldering jacks inline for each wire and mounting it all in a wee project box is the easiest route.I was wondering about introducing some protection for my instruments though. How would i best go about protecting against:Over voltage conditions - inline an opto coupler? Would this potentially screw with the RF signals?Polarity errorsOver current - unlikely i'd have thought although i could be using more than 1 probe on the scope at a time so it's possible, maybe i should include fuses anywayI'd like to make this a keeper, i can imagine using it many times over the years so a little extra effort up front to make a quality breakout box would be worthwhile.
Observe a lorenz attractor with DS1054z XY mode, possible? - Page 1
Forum section: electronics / beginners

author: belzrebuth
author_rank: Frequent Contributor
timestamp: February 19, 2021, 06:36:28 pm
content: I've built a chaotic circuit on a breadboard and I'm trying to display the dual "lobe" atractor waveforms on a DS1054z but I think I'm missing something since I all I get is a dot dancing around.I probably need to set the persistence time to "infinite" while in XY mode so the path that the dot crosses should remain in the screen but the persistence time option is greyed out.Can I do something like this with this scope?

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: February 19, 2021, 06:42:31 pm
content: Two things to adjust:1. Your horizontal scale.2. Your acquisition memory depth.Just play with them and see how it affects how many dancing dots you get and/or how much of lobe is drawn.Example is for sine + cosine (hence a circle).(This is where my 47-year old analog CRT scope beats the Rigol hands downas shown here:)

author: belzrebuth
author_rank: Frequent Contributor
timestamp: February 19, 2021, 07:16:34 pm
content: Luckily I have an old Tek scope lying around.I couldn't get the timebase to a higher setting than 50mS on the DS1054z and my circuit is slow so that's what prevented it from properly displaying the lobes.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: February 19, 2021, 07:21:41 pm
content: As with many things, using both types of 'scope can give more insight into the signal structure than just one or the other.

author: belzrebuth
author_rank: Frequent Contributor
timestamp: February 19, 2021, 07:25:36 pm
content: I agree, it was a hard transition from the analog scope to the digital one but I liked the extra features.But I still like an analog scope a lot better for viewing signals.They're snappier and certainly come closer to how a signal really *looks* like.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: February 19, 2021, 07:33:12 pm
content: Quote from: belzrebuth on February 19, 2021, 07:25:36 pmHmm, I think Dave might have something to say about your third pointI found this a very useful video:It depends on what you do are doing
Observing Embedded Hardware Logic Signals with an OScope - Page 1
Forum section: electronics / beginners

author: Unknown
author_rank: Unknown
timestamp: January 05, 2010, 04:51:03 am
content: I just picked up a Rigol 1102E, and I want to use it to read signals off of some embedded hardware in an attempt troubleshoot and identify some of the digital components. Right now, my goal is capture these signals, then plot them as a square wave so that the signal will resemble the output of a logic analyzer. I was wondering if there are any books, documents, or tutorials for performing tasks like this?Thanks.

author: Simon
author_rank: Unknown
timestamp: January 06, 2010, 08:35:08 pm
content: have you any ideas of what your actually trying to do ? I don't. why do you need to "plot the signals as square waves" ? if they are square waves they are square !

author: Unknown
author_rank: Unknown
timestamp: January 06, 2010, 08:58:28 pm
content: Sorry I was not clear. I want to plot the rise and fall of the signal based on the voltage. For example, voltages in the range 0 - +3.3 plot a 1 and voltages in the range -3.3 - 0 plot a 0. If the signal is plotted in this manner, then it will result in what looks like a square wave. To be honest, I forgot what this diagram is is called. The work I have done on stuff like this level was brief, and it has been about 5-6 years since then.I was wondering if it was possible to do this with the Rigol 1102E via some function or if anyone had any tips with regard to how they have done it in the past.Thanks.

author: Simon
author_rank: Unknown
timestamp: January 06, 2010, 09:10:06 pm
content: I don't think the rigol can do that, maybe by setting a lower that needed V/div you will get that effect as it will creat distortion but I think it will be hard to read. what frequency are you working with ? you could use a comparator circuit to covert the signal

author: jahonen
author_rank: Super Contributor
timestamp: January 06, 2010, 09:30:05 pm
content: I think that only reasonable way to do this would be by transferring the trace data to the computer and then convert the voltage on each data point to 0 or 1. Or perhaps there could be some kind of a software which continuously downloads and updates the results.Regards,Janne

author: EEVblog
author_rank: Unknown
timestamp: January 06, 2010, 11:48:10 pm
content: You'd have to suck the captured data into Excel and write a script to convert the voltages into 0 and 1's, and then plot it in some manner. Possible, but a bit messy.Why do you need to do this?, what advantage is there in converting to 0's and 1's?, do you want to analyse the signals with some form of automated script?Dave.
Observing RF Envelope on Rigol 8xx Series  - Page 1
Forum section: electronics / beginners

author: mgoldey
author_rank: Newbie
timestamp: February 09, 2024, 07:17:42 pm
content: I am looking to buy my first oscilloscope and would be grateful for confirmation that one of the Rigol 800 series scopes will perform the task I need most immediately. I am just getting started with hobbyist electronic repair and I'm a bit overwhelmed by all I've been reading and watching. I think I've learned enough already to feel foolish for asking this question, but I'm gonna ask anyway:I need to align DAT decks, which is a mechanical procedure involving adjusting rollers and guides. The right way to do it is with a scope hooked to test points on the deck, and to observe the RF envelope shape. When everything is correctly aligned, the envelope has a flat top. You can see what I'm talking about in these two videos:<< complete with some voltage / division info on the screenhttps://youtu.be/wN9hvVj50a8?t=122and give it 20 seconds for more if you're interested in what the display might be if things are bad.From reading service manuals, a 60 MHz scope is necessary, and obviously a good analog Tek scope would suit my needs. I can see that these Rigols are overkill for this one task. But I don't know where this hobby is going and I'd like to buy something that I can still use in 8 or 10 years if my interest grows. (Space is also a concern; smaller is much better. And given the uncertainty of buying a used Tek scope, the cost difference to get a new Rigol seems like money well spent.)From my research, I think that any of those Rigols will provide the visual output I need for this task, but maybe I'm totally missing the boat and they are not the right equipment for that job? I would be grateful for a little hand holding. I'll learn how to use it... but will it do what I need?Many thanks for your wisdom and advice.

author: MarkT
author_rank: Frequent Contributor
timestamp: February 09, 2024, 08:54:37 pm
content: Yes, if a 60MHz 'scope is required, a Rigol 60+MHz 'scope will work!Note well the use of 'scope probes in the x10 position - almost always the correct setting, essential for higher frequencies as the x1 setting is low bandwidth and can overload the electronics on the PCB.
Obsolete Legacy Components Frustration by Beginner - Page 1
Forum section: electronics / beginners

author: Shepen
author_rank: Newbie
timestamp: November 24, 2024, 07:19:06 pm
content: In examining an old relay (IDEC) I am looking up some components and cannot find any data sheets for some of them. I have been to a number of sites as mentioned in this forum. Maybe I am not searching in an approved manner!For instance this IC Chip has all the following information and I still can't find the data sheet:TEC 8805HEC9120 JapanExactly as printed on the top of the IC.I believe TEC is Tokyo Electric Company and the IDEC relay is at least 20 to 30 years old.What am I doing wrong in my searches?

author: fzabkar
author_rank: Super Contributor
timestamp: November 24, 2024, 08:18:00 pm
content: "9120" is probably a YYWW (Year / Week) date code, ie week 20 of 1991.Sometimes the Wayback Machine can be useful for old web sites.https://web.archive.org/Edit:I guess "8805" could also be a YYWW date code??

author: indeterminate
author_rank: Regular Contributor
timestamp: November 24, 2024, 09:52:58 pm
content: You will need to look through scanned hard copy books from that time.
Obsolete part replacement question - Page 1
Forum section: electronics / beginners

author: Crambone
author_rank: Frequent Contributor
timestamp: December 12, 2022, 01:17:34 pm
content: I need to replace a NE5532N would this be a good replacement TL061IP?Thanks for any help.

author: wraper
author_rank: Unknown
timestamp: December 12, 2022, 01:21:06 pm
content: In general it's a very bad replacement. Not to say NE5532 is not obsolete.https://mouser.com/ProductDetail/Texas-Instruments/NE5532P?qs=3pnr37ZAbK%252Bre0OAHDmGsw%3D%3D

author: wraper
author_rank: Unknown
timestamp: December 12, 2022, 01:28:34 pm
content: Also TL061 is a single opamp with different pinout, not dual like NE5532.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 12, 2022, 02:46:02 pm
content: I very much doubt the NE5532 would get obsolete very soon. It is more like than one of the similar onse like LM833, RC4580 or MC33078 may get obsolete. Chances are one would still find dual channel BJT based audio amplifiers. If needed use an adater to match a DIP footprint.
Obsolete Transformer Help! - Page 1
Forum section: electronics / beginners

author: stonerbot613
author_rank: Newbie
timestamp: October 04, 2018, 11:00:42 pm
content: I'm currently in the processing of updating a 20-25 year old power amp design and need some help identifying the type of transformer used on it.The markings on the transformer show either COEV TTI8105 or TRANSFORMER TECHNOLOGIES TTI8105. After exhaustive Google searching, I can't figure out what it is. It seems like COEV may have been bought out by TE at some point, but TE's website made no mention of the TTI8105 part number.Can anybody help me out here? Information about this transformer (or family of transformers) or old datasheets would be much appreciated.My apologies if this is the wrong forum for this type of question.Thanks

author: ArthurDent
author_rank: Super Contributor
timestamp: October 05, 2018, 12:17:55 am
content: I think you'll find that the numbers you list are in house part numbers and unless you can find information and parts list from the company that made the amp you may be out of luck.Is there a problem with the transformer? If not you may be able to measure the winding voltages/ratios and make an educated guess.

author: 6PTsocket
author_rank: Regular Contributor
timestamp: October 05, 2018, 01:09:53 am
content: More info please. What brand is the amp? MacIntosh continued to use audio output trasformers for a long time. Is this a power transformer or an output transformer. Take a picture.Sent from my SM-G900V using Tapatalk

author: stonerbot613
author_rank: Newbie
timestamp: October 05, 2018, 01:54:58 am
content: Picture is attached. I was under the impression that the company was either COEV or TRANSFORMER TECHNOLOGIES. Maybe I'm wrong. For scale, they are around 1" in diameter and around 0.5" tall.

author: ArthurDent
author_rank: Super Contributor
timestamp: October 05, 2018, 02:54:47 am
content: Those appear to be fairly small ferrite cup-core transformers that are normally not used in audio equipment. A photo of where they were in the circuit would help.

author: floobydust
author_rank: Super Contributor
timestamp: October 05, 2018, 03:39:37 am
content: It's surely a custom part. I've only seen JBL, Altec Lansing use interstage transformers in power amplifiers.Today it's all ferrite materials tailored for SMPS applications. Those cores give high distortion in audio use.The hard part is finding the pot cores.Many years ago I searched for "telecom grade" ferrites for a Pultec Eq clone project.My junk box shows them to be MMG-Neosid P11 material and I thought the B-H curve is fairly linear for low distortion.Perhaps askSowter Transformersas they reverse-engineer and manufacture vintage audio transformers.
Obtaining D flip-flop mosfet-level schematics from CMOS layout - Page 1
Forum section: electronics / beginners

author: promach
author_rank: Frequent Contributor
timestamp: July 05, 2019, 05:02:02 pm
content: Could anyone help to derive D flip-flop mosfet-level schematics from the following CMOS layout described in this conference document :Open Cell Library in 15nm FreePDK Technology?
obtaining frequency of coil - Page 1
Forum section: electronics / beginners

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: September 28, 2019, 02:03:06 am
content: Is it as simple as sweeping a coil with sines with an arbitrary generator while the scope is across the coil on FFT mode?

author: amyk
author_rank: Super Contributor
timestamp: September 28, 2019, 02:06:23 am
content: Explain in more detail what you mean by "obtaining frequency" - inductance?

author: Whales
author_rank: Super Contributor
timestamp: September 28, 2019, 02:07:48 am
content: N.B. a coil on its own tends not to have any (useful) frequency response, unless you are hunting for things caused by the interactions of inductance with internal parasitic capacitances. Are you intending to use it with a capacitor to make an LC circuit?> Is it as simple as sweeping a coil with sines with an arbitrary generator while the scope is across the coil on FFT mode?I believe so, just make sure your scope is measuring something useful (eg current into the LC circuit) and ensure that you are aware of whether or not your siggen changes amplitude when you change frequency (depends on the design/quality/age).

author: Simon
author_rank: Unknown
timestamp: September 28, 2019, 06:19:39 pm
content: If you are looking at the self resonance i think you just need to give it a pulse and see what frequency it oscillates at.

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: September 28, 2019, 06:22:03 pm
content: This is to obtain coils LC or SRF frequency were capacity is coils parasitic capacitance. The issue is probing it without a resistor which lowers Q offsetting frequency.

author: Simon
author_rank: Unknown
timestamp: September 28, 2019, 06:25:44 pm
content: well if you drive a square wave through it you should see peak signal strength at the resonant frequency.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: September 28, 2019, 08:41:56 pm
content: And if you look at the completely on-topic and ad-free videos I linked in my mysteriously disappeared post you will see some examples of same.

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: September 28, 2019, 10:09:48 pm
content: Greatly appreciated to the mods who removed the offending new age trash off this topic in the form of youtube videos. Same user of posted youtube videos reports on free energy and overunity.https://overunity.com/profile/tinselkoala.13644/Quote from: Simon on September 28, 2019, 06:19:39 pmMutual inductance should make this simple for exposed coils. For ferrites and high permabile xfmr wound parts it needs to be directly probed.
OC & OV bus protection - Page 1
Forum section: electronics / beginners

author: mmx01
author_rank: Contributor
timestamp: November 01, 2023, 09:45:36 am
content: Hi,I am working on a gateway device that translates TTL to CAN & RS485/modbus frames. Software wise I have it all sorted but I also wanted to implement basic hardware protection.Drivers:CAN - SN65HVD230DRRS485 - THVD1406DRTTL - ESP32Input voltage to the board is 48V with few step down DC/DC converters so I want to protect the circuit also against mistake in wiring on top of other failure related OV/OC conditions. Reverse polarity is addressed via Shottky diode but now I want also to protect bus drivers. I did not go for opto isolation and wanted to start with basic "minimum".My plan is to use Resettable Fuses - PPTC on each line CL, CH, A+, B-, RX, TX for a total of 6 for OCP with trip current of 300mA/hold 100mA and 60VDC.Then "crowbar" circuit for OVP:>SZNUP2105LT1G one for CAN, CH, CL tied to GND>SZNUP2105LT1G one for RS485, A+, B- tied to GND>2x TISP4015L1AJR-S, one for TX and one for RX lines tied to GND.Question 1: SZNUP2105LT1G is specificaly for CAN but looking at the datasheet no reason it wouldn't work for RS485. Brekadown voltage appears to conform with both. Do I miss something? Same part, simplier BOM.Question 2: TTL operates at lower voltages, and breakdown voltage of SZNUP2105LT1G of 26-32V to my liking seems to be too far from the TTL levels. TISP4015L1AJR has breakover of 15V. Is that still too far off or acceptable? TVS diode vs. thyristor I don't consider a factor here, both parts are for digital communication so speed should not be a concern. CAN is 500k, RS485 is 9600 and TTL is 9600.Thanks in advance.Regards,M

author: Terry Bites
author_rank: Super Contributor
timestamp: November 01, 2023, 03:13:04 pm
content: RS485 can have legitimate CMVs ranging from –7V to +12V. To be fully compliant you will need to accomodate this.I've used 74S1053 bus terminators (with series resstors) to clamp over voltages. They can be used to set different clamping levels via Vcc and ground connections.

author: mmx01
author_rank: Contributor
timestamp: November 01, 2023, 06:49:02 pm
content: So 2x TISP4015L1AJR-S on RS485 bus would offer better compatibility? This delivers -15V to +15V.What puzzles me is all these parts state they are bidirectional, my assumption with SZNUP2105LT1G was that the breakdown voltage of 26V is truly from -26V to 26V so covering the spec. I am not sure of this assumption hence the question here.
ocilloscope 2 Signal Source Channels - Page 1
Forum section: electronics / beginners

author: billp2
author_rank: Newbie
timestamp: August 03, 2019, 04:32:55 am
content: hi, i'm looking to buy a scope that can be used to look at two signals with different time base and voltage base values. i'm assuming that i need an ocilloscope with 2 Signal Source Channels. is this true? I haven't found anyone that has experience with this.Dave is awesome!

author: David Hess
author_rank: Super Contributor
timestamp: August 03, 2019, 10:11:44 am
content: Do you mean something modern? Dual timebases is not a very common feature.The best which can generally be done is to use two separate oscilloscopes or display the original and horizontally magnified waveforms at the same time.

author: Gyro
author_rank: Super Contributor
timestamp: August 03, 2019, 02:48:47 pm
content: Quote from: billp2 on August 03, 2019, 04:32:55 amThere's a bit of ambiguity in your question. As David says, dual timebase scopes are rare these days. If your frequencies are close, then many scopes offer alternate trigger, these would allow you to achieve two stable traces if the frequencies fit sensibly within the same timebase setting.It's your "voltage base values" that has me worried. Do you mean different voltage levels (easily taken care of by the input attenuator settings), or do you mean probe ground references? If it's ground references then you're in for an expensive time. Normal scopes assume the probe ground references are the same as mains ground, a very few specialist scopes offer galvanic isolation between channels. The other way to go is a pair of differential probes.Needless to say (hopefully) there are potential safety issues if you attempt to reference probe grounds to elevated voltages.Maybe you can clarify your needs?

author: JustMeHere
author_rank: Frequent Contributor
timestamp: August 06, 2019, 02:09:09 am
content: Rigol 1054 is a good start. It won't do the two diff time base, but you can do a "deep memory" capture. Dave Jones has several videos on it.

author: billp2
author_rank: Newbie
timestamp: August 06, 2019, 02:51:32 am
content: thank you all so much for the info. i have all i need at this point and no other response to this is needed.

author: Brumby
author_rank: Unknown
timestamp: August 06, 2019, 03:57:24 am
content: It would seem you are new to the world of oscilloscopes.They are very useful bits of kit - but you will need to take care and definitely do some homework before you start connecting things up.This is a good place to start:
octopus component tester - Page 1
Forum section: electronics / beginners

author: glinjik
author_rank: Regular Contributor
timestamp: March 30, 2023, 06:48:44 pm
content: hi im looking at this circuit but slight problem i have a 19v transformer whats the best way to reduce the voltage without using a transistor

author: Gyro
author_rank: Super Contributor
timestamp: March 30, 2023, 07:06:51 pm
content: The 560R and 100R resistors form a voltage divider, producing approx 1V across the 100R with a 6.3V transformer.Replacing the 560R with a 1k8 resistor will result in the same 1V with a 19V transformer. The resistor will be dissipating 180mW so you need to use at least a 1/4W part, preferably a bit higher, eg 0.5W.P.S. I suggest duplicating the calculations, using Ohms Law, as a double check and for practice.

author: glinjik
author_rank: Regular Contributor
timestamp: March 30, 2023, 07:18:47 pm
content: thank you

author: wasedadoc
author_rank: Super Contributor
timestamp: March 30, 2023, 07:38:41 pm
content: Quote from: glinjik on March 30, 2023, 06:48:44 pmFor future reference, you would need to be exceedingly devious to reduce thatalternatingvoltage using a transistor.

author: MathWizard
author_rank: Super Contributor
timestamp: March 31, 2023, 10:32:40 pm
content: Power dissipated in a resistive load, with Ohm's law V=R*I, for DC, and Vrms=Vp/(sqrt2) for a sinewave.P=I*V= R*I^2 = V^2/RYou can split the power over more resistors, with series and/or parallel combinations. You just have to keep the total peak voltage drop, and total equivalent resistance the same. But yeah it depends on what resistors you have and how many connections are convenient, etc.I can't remember how hot a 0.25W resistor is at 0.2W, but I think it's getting close to finger burning levels. With 1W resistors I still try to keep under 0.6W. That's just me tho, some circuits it won't matter and some people don't care anyways.I'm making a Heathkit type curve tracer, and for some reason in the circuit simulator, the switches and voltages aren't making sense, for NPN or PNP parts to work as expected. But I can't find anything wired wrong, or any op-amp backwards.I have a transformer wired up as an octupus tester, I still use it on unknown zeners sometimes, but the adjustable PSU is fine too.
Octopus Curve Tracer and capacters - Page 1
Forum section: electronics / beginners

author: whitevamp
author_rank: Regular Contributor
timestamp: May 12, 2017, 05:49:18 am
content: so i just got my new ds1054z today and i decided to make a Octopus Curve Tracer and check out some components, and i hooked up a 220mf electrolytic to it and i did see a circle as you would expect to see but i was getting a line above and below it.i then hooked up another cap to it, and i saw it with just one line above it, and it also had lines running through it.the lines was intersecting the top of the circle, and bottom. so it was not a separate line.so are these caps bad? or is it a case of ID10tand i did test a .1 ceramic cap and saw a nice round circle.and if you don't know what ID10t is.http://www.urbandictionary.com/define.php?term=ID10T

author: w2aew
author_rank: Super Contributor
timestamp: May 12, 2017, 01:15:55 pm
content: It's difficult to tell what's going one without a picture - but I will say this. You generally should not test polarized caps with a basic octopus tester because it applies an AC test signal and will reverse bias them - not a good idea.

author: whitevamp
author_rank: Regular Contributor
timestamp: May 12, 2017, 02:57:06 pm
content: Quote from: w2aew on May 12, 2017, 01:15:55 pmok thats good to know.and since its not a good idea to test them this way, i wont bother taking a pic.