hybridfree/eevblog-posts huggingface dataset:
Can these op amps be replaced for something else? (TL074, 072...etc.) - Page 1
Forum section: electronics / beginners

author: ShaunG01
author_rank: Newbie
timestamp: December 27, 2021, 07:47:44 am
content: I've been working on making a PCB for the following circuit down below.It's an envelope generator based around the CEM3310 chip.I've noticed that for the op amps used in the circuit, it uses different op-amps such as the LM348, LM1448, and a TL084. Is there a reason for these particular choices? It seems like they are used interchangeably, as seen in the case of the two inverters seen on the bottom left.And I thought...why not work with one type of op-amp?I was wondering if I could replace them with something like the TL074.Down below is an article from the original publishment.http://www.digisound80.co.uk/digisound/modules/80-10_files/80-10_ETI.pdf

author: Kleinstein
author_rank: Super Contributor
timestamp: December 27, 2021, 08:30:08 am
content: At a first glance it looks OK to replace the OPs in this circuit with TL074/TL072. At the time the circuit was made the LM1448 / LM348 may have been cheaper. The TL084 is anyway just the lower grade (possibly higher noise, but rumors are the modern ones are the same anyway) version of the TL072.

author: Terry Bites
author_rank: Super Contributor
timestamp: December 27, 2021, 05:43:06 pm
content: It looks entirely sensible - check that your substute amp for IC6a and b will operate as comparators. The LM348 is as crap as a 741 so you'd be well shot of those.www.digisound80.co.uk/digisound/modules/80-10_files/80-10_ETI.pdfalso seen in Barry Klien electronic music circuits page 179... A great little book:https://archive.org/download/electronic-music-circuits/ElectronicMusicCircuits.pdfAS3310 substitutes for CEM3310, just in case you blow it up! electricdruid.net/product/as3310-vcadsr/Well worth a read for any Analog EM enthusiast:www.thatcorp.com/THAT_Design_Support.shtmlandwww.thatcorp.com/datashts/Analog_Secrets_Your_Mother_Never_Told_You.pdf
Can this be used a probe isolator to an oscilloscope? - Page 1
Forum section: electronics / beginners

author: FriedMule
author_rank: Frequent Contributor
timestamp: February 04, 2022, 06:32:47 am
content: Was on mouser and stumbled upon this DC-3GHZ isolator fairly cheap, can it be used as an isolator between the scope and the standard probe?https://www.mouser.dk/ProductDetail/Mini-Circuits/Z7550-BMBF+?qs=DRkmTr78QASgPck0XOSDow%3D%3DDatasheet:https://pdf1.alldatasheet.com/datasheet-pdf/view/1324771/MINI/Z7550-BMBF+.html

author: tooki
author_rank: Super Contributor
timestamp: February 04, 2022, 07:48:18 am
content: But how is that isolated? On its schematic, it’s clear it’s not galvanically isolated.

author: fcb
author_rank: Super Contributor
timestamp: February 04, 2022, 09:13:40 am
content: Quote from: FriedMule on February 04, 2022, 06:32:47 amImpedance matching transformer. No isolation.

author: radiolistener
author_rank: Super Contributor
timestamp: February 04, 2022, 12:21:23 pm
content: there is no isolation, it has direct connection between input and output ground

author: jonpaul
author_rank: Super Contributor
timestamp: February 04, 2022, 01:00:01 pm
content: Hello: Unclear your objective:Isolate scope input 1 M from mains etc?Pass DC...HF and convert 75 Ohm ><50 Ohm?The Mini Circuits part is a Zo match with DC bias link eg for cable TV use. The transformer wthin has a LF point determined by the core, area and number of turns.This should be designated for example as 10 MHz...3 GHz 75><50 Ohm match with DC bias link"It is NOT a DC-3 GHz device despite the specs!Suggest to read the Tektronix Circuits Concepts book "Oscilloscope Probe Circuits Concepts" to understand the different scope input and probe options.https://w140.com/tekwiki/images/6/62/062-1146-00.pdfIf you can define precisely the system freq,min max (eg DC-100 MHz?) and isolation needed the forum can assit you better,Bon Chance,Jon
Can this buck converter be replaced with this part - Page 1
Forum section: electronics / beginners

author: Freshman
author_rank: Regular Contributor
timestamp: August 28, 2024, 05:29:57 am
content: I am using this part for a project:https://www.microchip.com/en-us/product/mic28511But now my purpose has changed. I only need to step down 16V to 5V with a maximum output load current of 2A. Can I replace the above part with MCP16361 (https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP16361-Data-Sheet-DS20006481.pdf)?I have a doubt because the MIC part has 24 pins but the new MCP part has only 8 pins. I have compared the specs and the MCP part can satisfy my output voltage and output current. But my doubt whether it can be a replaced for the MIC part?
CAN transceiver behavior during fault conditions - Page 1
Forum section: electronics / beginners

author: Apeksha
author_rank: Newbie
timestamp: February 03, 2019, 05:26:48 pm
content: I was just trying to understand the CAN transceiver TJA1042T behavior during fault conditions:1)CANH short to BATT2)CANH short to GND3)CANL short to BATT4)CANL short to GNDCAN Transceiver internal block diagram attached.I'm powering on the transceiver IC and giving the TXD signal from the signal generator (a 0-5V square wave) and I'm monitoring the CANH, CANL and RXD lines of the transceiver.During CANH short to battery, what I'm observing is that the CANL signal is also moving up to battery level during '1' bit transmission(recessive state) and during'0' bit transmission(dominant state) it is going down to a voltage level about 3.5V , so the differential voltage is about 8.5V (Battery voltage = 12V), and the RXD signal matches with the TXD signal, so the communication is still possible with CANH short to battery with the differential voltage being as high as 8.5V. (I'm trying to explain my observations, since unfortunately I cannot share the oscilloscope captures)During CANH short to GND, I expected the communication to stop but what I observed is that when CANH is short to GND CANL voltage level is also moving to GND during recessive state, and during dominant state the CANL is actually going negative to about -2.45V for a short duration and tries to got back to GND level ,so it's like a negative ramp signal and the RXD signal matches the TXD, the communication is still possible.During CANL short to battery,CANH signal is also reaching battery level during '1' bit transmission(recessive state) and during '0' bit transmission CANH voltage level is about 3V higher than the battery level for a very short during and reaching back to battery level , so the RXD signal is not excatly matching the TXD (what I mean when I say this is that is the TXD is high for 2us, the RXD is high for only about 500ns) , so the communication is interuppted.During CANL short to GND, CANH signal also goes down to GND level during '1' bit transmission(TXD high) and CANH reaches about 3V during '0' bit transmission(TXD Low) so the differential voltage is 3V and RXD signal matches the TXD, the communication is uninterrupted.If someone could explain to me how the voltage levels of CANH and CANL were shifting in all the cases, and how the CANL signal was going negative during CANH short to GND to maintain the differential volatge to interpret '0' bit transmission.Here's the datasheet of the transceiver:https://www.nxp.com/docs/en/data-sheet/TJA1042.pdfAnd the application note:https://www.nxp.com/docs/en/supporting-information/AH1014_v1_4_Application_Hints_TJA1042_43_48_51.pdfIn the application note, I found the pin FMEA for short circuit conditions as below:Image attachedOne observation during my testing which contradicts the table above is the condition 2) CANH short to GND, where I've observed that communication is still possible as opposed to what is given in the table above.
can vias improve current carrying capacity in a two layer PCB? - Page 1
Forum section: electronics / beginners

author: iontodirel
author_rank: Contributor
timestamp: October 18, 2017, 06:10:23 am
content: Can vias improve current carrying capacity in a two layer PCB? I have a 2 layer PCB, the top layer and the bottom layer carry high currents and it's the same path. If I add vias that connect the two layers, can that improve the current carrying capacity relative to not having any vias? Could the current carrying capacity improve with more vias?

author: samnmax
author_rank: Regular Contributor
timestamp: October 18, 2017, 06:50:13 am
content: Provided the current can reach both layers easily in their entry/exit points, additional vias spread through the track will not increase the current capacity. Instead, via holes will reduce the longitudinal cross-section of the tracks, reducing their capacity. Think of it this way: you want current to go through the X and Y axes, not Z.However, if your entry/exit points are too narrow, some vias around them may help with carrying current to/from top and bottom layers.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 18, 2017, 09:05:46 am
content: Better to open up soldermask and add big globs of solder, or tack on extra copper wire/strip.Tim

author: iontodirel
author_rank: Contributor
timestamp: October 18, 2017, 09:32:44 pm
content: so this is what I have

author: katzohki
author_rank: Frequent Contributor
timestamp: October 18, 2017, 11:08:18 pm
content: Google "Saturn PCB Tool" to help you make some calculations. Basically current capacity translates to "how much will my trace heat up?". Obviously at a certain point the trace will fail when it heats up too much (or fuses, if you happen to try forcing 200A through a 5 mil trace). Via stitching helps to move current from one layer to another by increasing the surface area and volume of the connection. This can be used for heat sinking, but I think the points others made about adding it in the manner you're suggesting are valid. I would consider an imbalance between the two paths and see if that could also cause trouble. You may need to increase the copper pour thickness.

author: iontodirel
author_rank: Contributor
timestamp: October 19, 2017, 09:14:33 am
content: thanks, fixed it
Can I design a high power non-isolated buck converter? - Page 1
Forum section: electronics / beginners

author: AbuIbraheem
author_rank: Newbie
timestamp: May 06, 2018, 08:27:26 am
content: Hi everyone,Part of my work includes designing power supplies. Many times I come across power levels for dc-dc converter topologies; same as the one in the attached picture from Fairchild "http://www.psma.com/sites/default/files/uploads/files/10%20PSMA%20PTR%202014_10_02%20Power%20Converter%20Topology%20Trends%20Mappus%20Fairchild.pdf"I am wondering why different topolegies can deliver different power levels? Also can I design a 1KW non-isolated buck converter?Thanks

author: David Hess
author_rank: Super Contributor
timestamp: May 06, 2018, 08:59:21 pm
content: Quote from: AbuIbraheem on May 06, 2018, 08:27:26 amThere are a couple of reasons.Some topologies require a power switch with a higher breakdown voltage for a given output power. This is especially a problem where leakage inductance adds to the required breakdown and with MOSFETs where die size is roughly proportional to the square of the voltage. It is often more economical to use a different topology with greater complexity than higher performance parts. Alternatively they may require excessive switching current making parasitic inductance a problem.Some topologies produce excessive ripple current at high powers making capacitive filtering difficult.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 06, 2018, 09:29:47 pm
content: I have no idea why they show red, blue, blue on the top row. They're all scalable to any size.The rest are mostly a matter of economy-of-scale. You don't want to bother with all the hardware required of an LLC or full bridge topology. Although, as integration becomes more common, these are more economical at smaller scales (see Power Integrations' stuff for example).As power and especially current goes up, it becomes much more desirable to use multiple phases in parallel. This significantly reduces input and output ripple current, and proportionally reduces the peak switching current, which helps with parasitics and snubbing, or in the extreme, makes the whole thing possible at all (where parasitics are too great, relative to the voltage, current and switching speed).Tim
Can we extend range for remote RF 2.4Ghz like wifi range extender? - Page 1
Forum section: electronics / beginners

author: sairfan1
author_rank: Frequent Contributor
timestamp: November 01, 2022, 05:57:39 pm
content: I have a remote button it works on 2.4ghz I want to build a range extender for it just like the idea wifi range extender works.I want to receive the signal when button pressed, then transmit the signal through NRF24L with extended range module.I do not know how button is transmitting its key or code to turn on the switch, but I'm sure its one way.Is it something possible?what things should i take care of?
Can we make onboard antenna external?  - Page 1
Forum section: electronics / beginners

author: mrnams
author_rank: Newbie
timestamp: May 26, 2023, 09:10:37 am
content: Hello,Sorry 1) if this is wrong place 2) Dumb question.I am working on smart irrigation project, I have Arduino connected with 4 sensors and 1 actuator, Arduino collect data and send to ESP32 using Reyax RYLR896 Lora Module connected to it.I keep all PCBs in one waterproof box, but this cause network loss with other Lora node, so I decided to remove antenna from RYLR896 and install it on tall pole and connect it to RYLR896 by single wire, will this, work?This is original RYLR896This is what I planned to install antenna

author: Manul
author_rank: Super Contributor
timestamp: May 26, 2023, 01:56:05 pm
content: No, not by single wire. You should use coaxial cable. Solder the cable's shield to module ground and center wire to the point of antenna output. The impedance matching might not be perfect, but most likely still ok.For the antenna I suggest you buy an off-the-shelf whip antenna for the frequency band of interest. Some come with a mount and coaxial cable attached, that simplifies your job.
Can Weller WE1010 use different irons?  - Page 1
Forum section: electronics / beginners

author: hamiltont
author_rank: Contributor
timestamp: February 10, 2019, 11:23:48 pm
content: Curious if the Weller WE1010 can run a cartridge-based iron? I've tried searching their site, but it's just too much new info...

author: kamil1987
author_rank: Newbie
timestamp: November 22, 2019, 10:36:30 am
content: I have to replace my WEP70. It's quite expensive - about half price WE1010 kit here in europe. I think about something else like some sort of chinese clone 907 or something like that, but nobody can tell is it work propellery. Maybe somone here did it and can help usEditWorks fine with 907A - ceramic heater with thermocouple.
can xgecu t56 program C1765ELS08C Xilinx IC PROM 3.3V 8-SOIC - Page 1
Forum section: electronics / beginners

author: psxpetey1
author_rank: Regular Contributor
timestamp: January 27, 2022, 06:00:44 pm
content: Theres an original roman jones programmer that can do that but I have an xgecu t56 heres the original;http://www.roman-jones.com/SPROMProgrammer.htm.are there any compatible chips? The t56 is made by the maker of those tl866. Xilinix is not on the list but I wonder if there is a compatible algo.
Can you amplify an arduino signal with two different power supplies? - Page 1
Forum section: electronics / beginners

author: yada
author_rank: Frequent Contributor
timestamp: June 16, 2017, 09:43:53 pm
content: If you have an Arduino powered off USB and you need to make it run a relay so you:take the digital out to a transistorTransistor amplifies the 5v and 10ma (or what ever low logic level is)To 12v and 200ma (what ever a relay likes)add a diode for back protection when the coil discharges.Now the Arduino cant power the transistor or the relay coil. How do you power such a circuit without hurting the arduino? Where should you add the diodes and what type should you use?

author: danadak
author_rank: Super Contributor
timestamp: June 17, 2017, 12:23:57 am
content: Some points about the circuit -1) The base R is calculated to drive base with 1/10 the collector currentyou want to drive the relay with. That's a rule of thumb to insure transistoris in saturation.So Rb = (Voharduino - Vbe) / (Ic / 10 )2) The circuit is missing a R from base to ground. Thats to insure transistoris off if the Arduino has port pin tri stated. Use ~ 10K for that. That absorbsany Icbo leakage of transistor when port is tri-stated.3) The circuit shown has 5V for relay, that can by a higher V, say 12 V, for a 12 Vrelay. Can be even higher, just insure Transistor has a breakdown voltage that is>> than Vrelay.Regards, Dana.

author: yada
author_rank: Frequent Contributor
timestamp: June 17, 2017, 02:39:09 pm
content: So having two totally separate power supplies is not a problem? For some reason I don't understand that, how the Arduino can use the ground off something else. Or does that switch tie the Arduinos ground to the power supply ground. It seems like connecting the + of a battery to the - of another battery and expecting it to work.

author: alm
author_rank: Super Contributor
timestamp: June 17, 2017, 02:53:42 pm
content: The negative terminal of the +5 V power supply driving the relay coil in the schematic Dana posted would be connected to ground on the Arduino, otherwise as you state the loop would not be closed. The +12 V supply driving the motor could be floating relative to the Arduino ground, since relays provide a galvanic separation between coil and contacts.
Can you build a better (dumb) leak detector? - Page 1
Forum section: electronics / beginners

author: joeyjoejoe
author_rank: Frequent Contributor
timestamp: August 19, 2019, 12:12:31 am
content: So, obviously these things are quite cheap, approaching 5CAD on AliExpress.Some potentially better variants are hitting closer to 8CAD on Amazon. (https://www.amazon.ca/Instapark-IN07A-Water-Sensor-3-Pack/)I'm wondering if I can make a better one.I'm envisioning a tiny PCB - bottom side is exposed traces to detect. Top is a tiny MCU (Attiny45/85?), piezo/buzzer of sorts, and battery.For the 555 crowd - MCU, as having low battery detection and beeps from a simple ADC would be imperative.The battery becomes a bit of a challenge:- CR2032 could last ages, until it needs to beep for 8 hours (assuming a leak immediately after leaving for work)- 9V makes the device rather thick- AA would allow for rechargeable, nice on the wallet, but two minimum to run MCU at ~2.8V.Another potential challenge is obtaining a good volume of beeper for low cost, and at what voltage does it need to be driven.Of course, it's a fun project, which is always a bonus!
Can you explain which two light don't come on and why? - Page 1
Forum section: electronics / beginners

author: Hedgefox
author_rank: Newbie
timestamp: June 19, 2023, 04:32:58 pm
content: Can someone explain the problem in the attached photo?I've been told that the correct answer is E. Four lights. Which two lights don't illuminate. The second from the top seems obvious but I can't figure out the second one.I'm confused.

author: newbrain
author_rank: Super Contributor
timestamp: June 19, 2023, 04:45:25 pm
content: Just a hint: try to draw the circuit with the closed switches replaced by a wire and removing the lamp you already (correctly) identified.And don't start from the answer or assume it's correct - make your own deductions.

author: Ian.M
author_rank: Super Contributor
timestamp: June 19, 2023, 05:12:49 pm
content: Switch 3 short-circuits all the other bulbs and switches except 1. Short-circuited components are effectively removed from the circuit. Therefore if ALL OF switches 1,2,3 and 4 are closed, only the bulb in series with the battery and switch 1 lights.

author: sparkydog
author_rank: Regular Contributor
timestamp: June 19, 2023, 08:20:49 pm
content: It... depends. Wires don't have zero resistance, and if the resistance of the lamps is near the resistance of the wire, youmightbe able to justify "three". (I'm reminded of a certain internet debate a while back involving a light-second of wire and a hypothetical light that turns on if it seesanycurrent.) But, more likely, "one" is the most reasonable answer.You can see for yourself bysimulating the circuit.I don't see any possible way for four lamps to illuminate, as three of the six are open circuits in the specified switch configuration. Whoever claimed that is... wrong.

author: Benta
author_rank: Super Contributor
timestamp: June 19, 2023, 09:50:06 pm
content: One is the correct answer.

author: Hedgefox
author_rank: Newbie
timestamp: June 19, 2023, 11:07:20 pm
content: Thank you to everyone who answered. I read this problem in a book called Passing Aptitude Tests and it was the only question I got wrong. The answer key said the correct answer was 4 and it really bothered me that I couldn’t figure out why..

author: donlisms
author_rank: Frequent Contributor
timestamp: June 20, 2023, 02:28:28 am
content: Now this calls into question the aptitude of the people who write the aptitude books! 4 is wrong. Remember that electrons don't really care of they're going left or right or up or down. A short is a short.

author: SiliconWizard
author_rank: Super Contributor
timestamp: June 20, 2023, 03:25:52 am
content: Depends.Are the photons all hugging one another?

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: June 20, 2023, 04:00:01 am
content: Quote from: SiliconWizard on June 20, 2023, 03:25:52 amI wonder if some exam paper writer somewhere might be having a little lend.edit: for those who may not know:https://en.wikipedia.org/wiki/Chain_of_Command_(Star_Trek:_The_Next_Generation)Quote
Can you guesstimate the VA capacity of a transformer? - Page 1
Forum section: electronics / beginners

author: icon
author_rank: Regular Contributor
timestamp: July 11, 2012, 03:59:11 pm
content: HiIf you have some random transformer that you pulled out of a piece of redundant equipment, can you hazard a guess as to a safe load, based on weight? Or would you just load it up and keep an eye on the temperature? What would be a safe temperature for a transformer anyway?CheersJohn

author: SeanB
author_rank: Super Contributor
timestamp: July 11, 2012, 04:07:24 pm
content: If it fits in the palm of your hand 5VA max. If you can fit it in your whole hand it is up to 100VA. If you need both hands to hold it up to 250VA. The size of the inner core determines the power it will handle. Compare to published figures for other transformers. Generally they should run at lower than 70c inside the core, measure with a thermocouple between the windings and the outer core. Not accurate, but a good place to start from.

author: BravoV
author_rank: Super Contributor
timestamp: July 11, 2012, 04:12:19 pm
content: On iron core, check this post ->https://www.eevblog.com/forum/projects-designs-and-technical-stuff/modding-an-isolation-transformer-please-advise/msg80157/#msg80157

author: icon
author_rank: Regular Contributor
timestamp: July 12, 2012, 08:18:42 am
content: Quote from: BravoV on July 11, 2012, 04:12:19 pm3Excellent, thanks - there was a link in that thread to an external website with some very useful info.CheersJohn
Can you help check my design for this remote light? - Page 1
Forum section: electronics / beginners

author: Jono427
author_rank: Contributor
timestamp: August 14, 2017, 02:11:34 pm
content: I could use some help with some questions and any other advice for the design or tips for the schematic.Run down of the parts:The encoder/decoder uses the 8 switch module for an address, the decoder will only process the data if it matches.The 4 switch module is for the "data" being sent. You can either send a low or high (5v in this setup) and this will trigger the LED array MOSFET. I'm using the data so you can activate up too 4 different lights independently but also at the same time (same address on receiver but set one to '0001' and '0010' to activate the MOSFET).Docs:MOSFEThttp://www.onsemi.com/pub/Collateral/FDU3N40-D.pdfHT-12D (Decoder)http://www.holtek.com.tw/documents/10179/116711/2_12dv120.pdfHT-12E (Encoder)http://www.holtek.com.tw/documents/10179/116711/2_12ev120.pdfQuestions:1 - How should I manually activate the light? Will the way on the schematic work or is it better to have the switch parallel to the MOSFET and switch the power directly?2 - Which side of the battery should the power switch go? I see lots of conflicting info about it being on either side for different applications.
Can You Help Identify This SMD Diode Wth Marking ADY? - Page 1
Forum section: electronics / beginners

author: GingGangGooly
author_rank: Contributor
timestamp: May 12, 2014, 07:53:10 pm
content: Hi AllCan anybody assist with identifying this SMD diode I have, the only making on the case is ADY. The diode is designed to clamp the current to ~20mA from 2v to 45v. I have tested this from 2v to 20v and it certainly does clamp the current, I bought the diodes from a hobby shop in the USA and would like to try and source some more locally to me in the UK.I have taken a photo of the case, if this is of help and a short video of the current clamp test with a Blue LED.Thankshttp://youtu.be/5eOjTCuwsck

author: Rudane
author_rank: Regular Contributor
timestamp: May 12, 2014, 08:35:49 pm
content: A search returned MAX6406BS24-T.Edit: This does not appear to be the device.Edit2: I didn't find anything, maybe someone else will do better.

author: Hideki
author_rank: Frequent Contributor
timestamp: May 12, 2014, 08:58:40 pm
content: I can't find ADY either, but if you don't need anything special I'm sure most small SOD-323 (or SOD-123) diodes will do. 1N4148WS and many others.Edit: Ok, you did mean something very special, not a simple diode, and it looks like Mike S found it. Well done!

author: Mike S
author_rank: Contributor
timestamp: May 12, 2014, 11:05:07 pm
content: Maybe the On Semi NSI45020A? Have a look at the marking diagram in the datasheet. It looks like it starts with "AD" and then the third letter is the date code, but I may have misunderstood.http://www.onsemi.com/PowerSolutions/product.do?id=NSI45020A

author: GingGangGooly
author_rank: Contributor
timestamp: May 12, 2014, 11:15:05 pm
content: Thanks, that certainly looks like the device. The data sheet even shows the microdot on the packaging, which I can see. I will see if I can source these locally, much appreciated

author: Hideki
author_rank: Frequent Contributor
timestamp: May 12, 2014, 11:20:05 pm
content: RS Components appear to have them in stock in the UKhttp://octopart.com/nsi45020at1g-on+semiconductor-11352190

author: Rudane
author_rank: Regular Contributor
timestamp: May 12, 2014, 11:28:10 pm
content: Good job Mike S.
Can you help me figure out this conflicting datasheet and product page? - Page 1
Forum section: electronics / beginners

author: Blitzschnitzel
author_rank: Regular Contributor
timestamp: October 04, 2023, 06:13:39 pm
content: Hi, so want to use the SK6812MINI-E LED but I need the version where the light emitting side faces downwards on the reel.LinkThis might be it and the suggested footprint would also match the downfacing one. But in the datasheet everything points towards the up facing one. Including top and bottom view in the drawing and the picture of the reel.Which one is this?

author: Blitzschnitzel
author_rank: Regular Contributor
timestamp: October 04, 2023, 06:18:40 pm
content: It seems like links or just those to JLCPCB are blocked.Anyway, I mean the part C5149201

author: ataradov
author_rank: Super Contributor
timestamp: October 04, 2023, 06:36:35 pm
content: All the pictures of the actual devices in the reel show them facing down. I think they are just reusing the graphics, as they often do.
Can you help me find a Datasheet for a LCD module ? - Page 1
Forum section: electronics / beginners

author: expertmax
author_rank: Regular Contributor
timestamp: August 03, 2013, 03:09:51 pm
content: Hi guys,I just ordered an LCD module for my little ATTiny project but unfortunately I can't find the datasheet for the LCD in question ! Here is all the numbers I could find on the PCB itself :-> HY-2002A6 (on the front)-> LCD2002A-401 (on the back)-> 041115 (on the back)This is the layout of the screen :I would love to be able to use the screen !Thank you so much for taking the time to help my on my quest for a datasheet !Thanks ! (BTW the reason why I don't use PICs is because I already know C and because of ignorance lol).

author: Unknown
author_rank: Unknown
timestamp: August 03, 2013, 03:48:22 pm
content: Sounds like a HD44780-compatible LCD. Based on the number of squiggly lines, I'm going to guess it'sthis pinout. Plenty of tutorials (search for HD44780 or text lcd) that tell you how to drive and program it. No way to tell which pin is pin one from your drawing, if you're lucky it's labeled (eg. a square pin for pin one), otherwise you have to trace the PCB (power and backlight pins are usually easy to recognize) or at least provide a high resolution picture of both sides of the PCB and hope someone volunteers to do it for you.

author: mariush
author_rank: Super Contributor
timestamp: August 03, 2013, 06:12:19 pm
content: Here's a datasheet for a lcd display that has the same layout :

author: expertmax
author_rank: Regular Contributor
timestamp: August 05, 2013, 10:47:54 pm
content: That's exactly it ! Thank you so much ! Have a nice one mate !
Can you help me identify this component? - Page 1
Forum section: electronics / beginners

author: guitchess
author_rank: Regular Contributor
timestamp: December 27, 2013, 07:58:15 pm
content: I'm trying to fix this little board. It is a horse sound effect module from a radio flyer rocking horse. Some one left batteries in it and they corroded. I think it is some sort of motion switch or a very small transformer.

author: SeanB
author_rank: Super Contributor
timestamp: December 27, 2013, 08:31:47 pm
content: Trembler switch. You would have had a cover and a small ball bearing inside that would roll around and make contact with the traces as it rotates or the unit is handled. Simplest DIY is to make one out of a thin spring steel wire with a small bit of solder on the top and a small ring about 3/4 of the way up connected to the other contact, so that any motion of the unit waves the spring into the ring completing the circuit. Otherwise a momentary push switch and then it is manual only.

author: guitchess
author_rank: Regular Contributor
timestamp: December 27, 2013, 10:12:36 pm
content: Thanks for the reply. That gave me enough info to know what to try. I've got it working already.
Can you help me identify this Schematic Capture program? - Page 1
Forum section: electronics / beginners

author: TurboSam
author_rank: Contributor
timestamp: February 22, 2018, 04:52:57 am
content: So I was looking around for circuits to help me learn a few thing and try them on my new DS1054Z, and I came across a YouTube video that creates a circuit and tests it with an oscilloscope on line that looked pretty interesting--at least to me. I have no idea if the program is a professional/corporate program or something suited to a hobbyist (like me), and I have searched hi and lo for what it is.I am reluctant to post a link to the video since I don't want to be accused of driving traffic to a video that, at this point, has ~1000 hits, 4 likes, 2 dislikes, and no comments.This is a screen of the program, so I am hoping someone can help me identify it:Thanks

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2018, 05:05:46 am
content: It is more of a simulator (look at buttons bottom left) than a complete schematic capture, I doubt it is very useful for that.

author: ElektroQuark
author_rank: Unknown
timestamp: February 22, 2018, 06:08:20 am
content: Proteus Schematic Capture
Can you help me identify this SMD component? - Page 1
Forum section: electronics / beginners

author: mvno_subscriber
author_rank: Regular Contributor
timestamp: January 13, 2021, 08:31:03 pm
content: I'm trying to fix a CD player (Project CD Box RS), and found a tiny little 6 pin chip where some of the plastic seemed to have melted. It is one of several small chips on a board that mainly contains a couple of voltage regulators, capacitors etc, as well as some pass through data bus (I think). I've already replaced a couple of L5970D regulators that blew (owner of the player managed to revert polarity of the power supply).The chip in question has become unreadable, but it's identical to those on either side (see attached picture, the chip in question has been removed). As far as I can tell, they seem to read "2120". A 2 might be a Z for what I know.. Does anyone know what this chip is?

author: mikerj
author_rank: Super Contributor
timestamp: January 13, 2021, 11:07:35 pm
content: They are connected to the RJ45 socket which is being misused as the I2S output, so they are very likely two channel buffers. You can see two in, two out and ground, supply on the centre pins which is pretty common configuration for these little buffers, but I couldn't find a match for the code.

author: amyk
author_rank: Super Contributor
timestamp: January 14, 2021, 05:17:03 am
content: That board looks quite filthy in the photo. Have you tried cleaning it a bit? The markings might become more visible too.

author: mvno_subscriber
author_rank: Regular Contributor
timestamp: January 15, 2021, 08:08:52 pm
content: I think the closest I'm coming to this is something like this:NJM2120https://www.mouser.com/datasheet/2/294/NJM2120_E-365026.pdfNJM2125https://no.mouser.com/datasheet/2/294/NJM2125_E-1917100.pdfI won't be using I2S on this, only SPDIF - so I guess I'm fine with just leaving them out.
Can you help me identify? - Page 1
Forum section: electronics / beginners

author: whaase
author_rank: Contributor
timestamp: April 08, 2015, 12:32:59 am
content: I have this capacitor? I can't seem to find a replacement. I've googled and and get different values depending on the page.. I've gotten 0.14uF and 0.01uF?Thanks, Walter

author: wraper
author_rank: Unknown
timestamp: April 08, 2015, 12:35:51 am
content: If you mean biggest one, it is 0.18uF 630V

author: whaase
author_rank: Contributor
timestamp: April 08, 2015, 12:42:47 am
content: Ah ok. I need to figure how to read all these partsThank you

author: whaase
author_rank: Contributor
timestamp: April 08, 2015, 01:03:23 am
content: Can someone link me to one of these? I can't seem to find it on Mouser

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 08, 2015, 01:28:06 am
content: Quote from: whaase on April 08, 2015, 01:03:23 amYou go to mouser, select "passives", then "capacitors" and put the values into the search mask".

author: whaase
author_rank: Contributor
timestamp: April 08, 2015, 01:49:15 am
content: Thank you

author: Ian.M
author_rank: Super Contributor
timestamp: April 08, 2015, 02:10:11 am
content: You've already been told the value, but for completeness:184 J 630Vhas three parts which are in order:1. Value in pF with 3rd digit as the multiplier = 180000pF = 0.18uF2. Letter for the tolerance (J) = +/-5%3. Max Voltage (not coded) = 630Vhttp://www.radio-electronics.com/info/data/capacitor/capacitor-markings.phpmay help in future.

author: whaase
author_rank: Contributor
timestamp: April 08, 2015, 02:18:35 am
content: Thank you! I've been wondering that. Seems like ever manufacturer lables thing different. I'll get itWalter

author: Zero999
author_rank: Super Contributor
timestamp: April 08, 2015, 09:01:44 am
content: It's actually pretty standard for smaller capacitors.The value is also often just two digits long, in which case it's just the value in pF, unless it's a polarised capacitor, in which case it'll be in µF. You may also see things like 4p7, in which case the p replaces the decimal point so it's 4.7pF.

author: whaase
author_rank: Contributor
timestamp: April 09, 2015, 12:38:14 am
content: What is acceptable tolerance?

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 09, 2015, 12:42:44 am
content: Quote from: whaase on April 09, 2015, 12:38:14 amWell... that was allready mentioned :-)

author: whaase
author_rank: Contributor
timestamp: April 09, 2015, 01:30:09 am
content: Sorry, I was thinking "in general", but I realize its all different. I'll look up the specifics on certain compacitors.

author: Ian.M
author_rank: Super Contributor
timestamp: April 09, 2015, 01:57:04 am
content: There's a few more oddball capacitor codes you may bump into in old or vintage equipment.http://www.radiomuseum.org/forum/for_beginners_prefixes_and_codes.html

author: Cliff Matthews
author_rank: Unknown
timestamp: April 20, 2015, 03:35:54 pm
content: I see litz wire on that transformer - is this from a microwave oven?

author: whaase
author_rank: Contributor
timestamp: April 20, 2015, 05:28:46 pm
content: No, it from a LCD TVWalter
Can you help me? PS3 fat ylod fix fail - Page 1
Forum section: electronics / beginners

author: Gary59
author_rank: Newbie
timestamp: July 18, 2022, 03:22:38 am
content: Hello, I have a ps3 fat board dia-001, by accident I pulled 2 capacitors from the board, I would like to ask if those two capacitors can cause me problems, luckily and bad luck I keep the largest one but the smallest one I lost (I haven't installed the tantalum capacitors yet)... and I also want to ask how I can use my multimeter to test that every aspect of the board is working 100%. thanks m8´s

author: rooppoorali
author_rank: Regular Contributor
timestamp: July 21, 2022, 10:05:09 am
content: Do you have any schematic of this device?

author: samnmax
author_rank: Regular Contributor
timestamp: July 21, 2022, 12:14:06 pm
content: Quote from: Gary59 on July 18, 2022, 03:22:38 amThere may be schematics of your model of PS3, but don't count on it. I think you should be able to solder the big one easily, and I would not worry much about the small one. I knocked a tiny capacitor near the CPU on my fat PS3 when cleaning and repasting the heatsink. It worked fine, enough to complete The Last of Us, and was working the last time I used it. I did not change the NEC Tokin caps yet.
Can you ID this ST Microelectronics SMT component? - Page 1
Forum section: electronics / beginners

author: krazytech
author_rank: Newbie
timestamp: April 18, 2011, 04:10:27 am
content: Please help ID this component. I want to find the Datasheet. I did a google search ofe3 Z3m y725but nothing can up... this is from a Asko dishwasher control the one next to it has a chip blown off of it....

author: sacherjj
author_rank: Frequent Contributor
timestamp: April 18, 2011, 04:37:54 am
content: Is that going into any of the AC switching solenoids or similar components? Those look like the Triacs I found in a family members dish washer while I was tracing some electrical problems down. I believe the ones I ran into were switching water valves or somethings like that. It has been a few years.

author: krazytech
author_rank: Newbie
timestamp: April 18, 2011, 04:56:02 am
content: the component that is blow is runs a diverter valve 120v motor.

author: Bored@Work
author_rank: Super Contributor
timestamp: April 18, 2011, 06:08:38 am
content: Z0103MN - STMicroelectronics Z01 series Triac; 1 A; 3 mA sensitivity; 600 V

author: krazytech
author_rank: Newbie
timestamp: April 18, 2011, 06:21:13 am
content: thankshow do I read it.e3 Z3m y725 ??

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 18, 2011, 08:35:46 am
content: Quote from: krazytech on April 18, 2011, 06:21:13 amFor SM parts with limited markings, you generally need to guess what it is based on context, and then look up likely datasheets to find one that matches - dataheets usually list the actual markings.

author: armandas
author_rank: Frequent Contributor
timestamp: April 18, 2011, 08:23:21 pm
content: http://www.datasheetarchive.com/has a contextual search feature. Entering Z3M gave me a link to the right datasheet (Z0103MN, as identified by BoredAtWork).

author: krazytech
author_rank: Newbie
timestamp: April 18, 2011, 11:27:52 pm
content: thanks !!!
Can you identify class of this part? - Page 1
Forum section: electronics / beginners

author: bluerobin
author_rank: Newbie
timestamp: October 26, 2010, 02:58:22 pm
content: Hello to you all,Attached is the photo of Coghlan's Big Screen Digital Compass. I am trying to identify the class of two green parts (circled). I've looked at the board and these two are the best candidates for the magnetic field detectors due to their north/south and east/west alignment. I would suspect these are hall effect linear field sensors, but all parts i can find on digikey have 3 contacts not two. The other alternative is the reed switch which matches in shape but not quite in functionality.Anyone has an idea?

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: October 26, 2010, 04:15:10 pm
content: Damn I'm good.QuoteToward the bottom of the following web page you'll see the part and links to the datasheet and ap-notes.http://www.willow.co.uk/html/oem_compass.html

author: Time
author_rank: Frequent Contributor
timestamp: October 26, 2010, 04:18:53 pm
content: Quote from: JohnS_AZ on October 26, 2010, 04:15:10 pmlol nice

author: bluerobin
author_rank: Newbie
timestamp: October 26, 2010, 04:47:39 pm
content: great, thank you very much!Too bad i can't find it on any of my regular distributors (digikey, etc). I bet it would be a much cheaper solution than the $20 HMC5843. The whole digital compass was selling for $18 on amazon.

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: October 26, 2010, 05:07:50 pm
content: I doubt it would actually be cheaper.You'd need two or three of the sensors, and their ASIC to drive them all.IMHO, $20 for the HMC part is really quite a bargain, considering it's a 3-axis magnetometer with a pretty simple interface. The Coghlan is only two axis, which is why you have to hold it flat and level to get an accurate reading.

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 26, 2010, 05:24:36 pm
content: right inside my brain. to build an electronics compass! 3-Axis is a plus. where to get this?"These sensors change inductance by 100%"what does this mean? maximum Henry when heading south or north and 0H when heading west,east? or...maximum Henry when heading north and 0H when heading south, in between when heading west,east?

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: October 26, 2010, 05:32:12 pm
content: Google "3-axis magnetometer"

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 26, 2010, 07:24:20 pm
content: found insparkfun. why they spec its resolution as uT unit? cant it be just plain degree? $60? quite a pricesome variation i found:HMC6352Digital 6 in 1 Compass2 Axis Magnetometer with UART & i2ci just found out that i bought the 3rd from sureelectronics a time ago, but never put it into use. not sure how good it is esp when in tilted position.

author: marianoapp
author_rank: Regular Contributor
timestamp: October 27, 2010, 01:44:13 am
content: Quote from: shafri on October 26, 2010, 07:24:20 pmbecause it's a magnetometer, not a compass, so it must measure using a magnetic field strength unit, like theTesla
can you identify the component? - Page 1
Forum section: electronics / beginners

author: st1
author_rank: Contributor
timestamp: May 12, 2011, 03:38:51 pm
content: Try as I might, I cant Identify this little sucker. No datasheet, nothingSo! Half my kingdom and my unborn daughter for the one who finds the datasheet / Information on this component

author: insurgent
author_rank: Regular Contributor
timestamp: May 12, 2011, 03:51:26 pm
content: I'm guessing it's a 2SC1845http://datasheet.octopart.com/KSC1845PTA-Fairchild-datasheet-48810.pdf

author: st1
author_rank: Contributor
timestamp: May 12, 2011, 03:59:07 pm
content: Working on a daughter for insurgentThanks man, i was having a hard time finding the data for some reason

author: vk6zgo
author_rank: Super Contributor
timestamp: May 13, 2011, 09:14:46 am
content: For some strange reason,Japanese manufacturers often leave the "2SC" part off.VK6ZGO
Can you identify this component? - Page 1
Forum section: electronics / beginners

author: SteveThackery
author_rank: Super Contributor
timestamp: February 26, 2025, 04:53:00 pm
content: Colleagues,Have you any idea what this component is? It has a distinctive shape but no markings. It is inside a low-cost projector which projects slowly moving patterns on the ceiling. All the other components apart from this one are SMD; this is a PTH device and, strangely, is spaced well away from the board at an angle. The leads are marked O, G and V on the circuit board. See attached photos.All ideas welcome!

author: Grandchuck
author_rank: Super Contributor
timestamp: February 26, 2025, 05:14:48 pm
content: Sensor ... maybe Hall effect?

author: Gyro
author_rank: Super Contributor
timestamp: February 26, 2025, 05:30:49 pm
content: It's an IR remote control sensor. Pins are V = supply (probably 5v) G = Ground and O = Output.

author: SteveThackery
author_rank: Super Contributor
timestamp: February 26, 2025, 05:45:06 pm
content: Quote from: Gyro on February 26, 2025, 05:30:49 pmAh, of course! The projector does have a remote control, and I just assumed it was RF. But you are right, it has an LED. So the IR sensor is spaced away from the LEDs and upwards into the area where IR can reach it.Thanks!

author: Sassy Taste
author_rank: Contributor
timestamp: February 27, 2025, 08:44:27 am
content: Is that a transistor? 3 legged creatures. It looks like a mosfet.

author: SteveThackery
author_rank: Super Contributor
timestamp: February 27, 2025, 02:04:54 pm
content: Quote from: Sassy Taste on February 27, 2025, 08:44:27 amDid you read the thread?

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: February 27, 2025, 04:14:18 pm
content: Infrared receiver.These usually have the receiver itself, and also a filter for a certain carrier frequency. Usually its between 38KHz to 40KHz

author: tooki
author_rank: Super Contributor
timestamp: February 28, 2025, 12:20:16 am
content: Quote from: BadeBhaiya on February 27, 2025, 04:14:18 pmIt’s more than that. Not only a filter for a given carrier frequency, but one optimized for the combination of carrier frequencyanda particular signaling protocolandfor specific noise environments. (Like how Bluetooth and Wi-Fi actually induce interference in older IR receivers; modern ones are expressly designed to deal with this.)For example, 38kHz is commonly used with the NEC protocol, but is sometimes used with others, and those may benefit from different optimizations.See the attached PDF from Vishay, which is the leading IR receiver manufacturer (original URL:https://www.vishay.com/docs/80071/dataform.pdf)Also, 56kHz is another very common carrier frequency, especially in European devices.
Can you identify this conector - Page 1
Forum section: electronics / beginners

author: coug60
author_rank: Newbie
timestamp: March 28, 2025, 05:46:24 am
content: Can anybody identify this connector type. I broke this piece on another camera cable and need to put on a new one but cant find it what kind of connector it is.

author: Swainster
author_rank: Frequent Contributor
timestamp: March 28, 2025, 07:24:31 am
content: Hard to say without more pics and measurements, but could be a TV aerial connectorhttps://en.wikipedia.org/wiki/Belling-Lee_connector

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: March 28, 2025, 07:46:10 am
content: Where did you get it from? With which device is it being used?

author: coug60
author_rank: Newbie
timestamp: March 31, 2025, 02:33:39 am
content: My new truck came with a external camera that can be mounted on a RV or trailer that can then be viewed on my navigation screen in my truck. This is the connector to the Camera. It connects to my tailgate. It was torn off accidentally.The cable is about the size of RG6 i believe bit its not an RG6 Connector.

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: March 31, 2025, 06:35:45 am
content: Do you have the broken connector’s other half? That might help identify it better.