hybridfree/eevblog-posts huggingface dataset:
Lens - Page 1
Forum section: electronics / projects

author: jonbang
author_rank: Newbie
timestamp: March 02, 2020, 11:38:35 pm
content: I dont know if this is the right place to ask, but i have a filmscanner, made by a company in Canada. In this scanner there is a lens between the film and the camera. Now this lens is full of scratches and shit so i have to swap to another. But i have asked the producer of this scanner, but he hasnt been able to give me any answer for at least 2 weeks, i have mailed him and also called him. But how can i find the right lens for this? What shall i look for, and so?Thanks. :-)

author: magic
author_rank: Super Contributor
timestamp: March 03, 2020, 11:42:27 am
content: Quite likely a custom job and they won't tell you anything. If the scratches don't cause visible degradation, ignore.

author: andy3055
author_rank: Super Contributor
timestamp: March 03, 2020, 02:00:12 pm
content: Quote from: jonbang on March 02, 2020, 11:38:35 pmIf you post the make/model and a picture of it, someone here might respond. Just a suggestion.

author: graybeard
author_rank: Frequent Contributor
timestamp: March 05, 2020, 01:08:33 am
content: You might try to find a lens that will work at Edmund Opticshttps://www.edmundoptics.com/
Lesser known MLCC brands - Page 1
Forum section: electronics / projects

author: Siwastaja
author_rank: Super Contributor
timestamp: March 19, 2016, 09:58:24 am
content: Hi,Any design experience on lesser known (mainly Chinese) MLCC manufacturers? I'm not talking about random Alibaba parts, but would you trust manufacturers that appear to be reliable enough so that known suppliers (Farnell/Element14, Digikey, etc.) distribute their products?Would you use one in a somewhat high-reliability application, knowing that MLCCs may suffer from ceramic cracking? Let's assume that they won't be abused (mechanical stress, soldering).These parts often lack proper specifications such as DC bias graphs, but this happens with some quality parts from known brands, too.As an example, I'm considering using this:http://uk.farnell.com/walsin/0805x106k160ct/cap-mlcc-x5r-10uf-16v-0805-reel/dp/2495549in a DC-DC converter at 5V. The price is approx. half of the similar AVX part which only has 10V rating, but I'm assuming this Walsin part could have worse DC bias effect (as it's unspecified) and therefore need more voltage derating. The price difference is still very appealing.General discussion welcome, I'm not after any specific design help. Would you trust these products when reliability is important? Do they hold up to their capacitance claims, or do they need more derating than "known" parts, reducing the price benefit?

author: BravoV
author_rank: Super Contributor
timestamp: March 19, 2016, 10:11:51 am
content: Funny, I made similar thread recently (HERE), although its Samsung.Is that even cheaper than Samsung MLCC ? Btw, I did buy Samsung's and tested, it up to it's spec.

author: wraper
author_rank: Unknown
timestamp: March 19, 2016, 10:30:31 am
content: I don't think there is anything wrong with those capacitors. As with MLCC faults, it's mostly mechanical stress on the PCB. As of one example, Raspberry Pi B+, and pi 2. On I've seen about 15 of them with C97 capacitor being short and it's always this one particular cap out of 5 such capacitors on the board. Moreover there is one same cap in parallel which never failed. The reason is, they put this cap 2mm from the board edge which is V-groove on top of that, therefore additional mechanical stress during the depanelization.BTW you can get Samsung for less than half of that:http://www.tme.eu/gb/details/cl21a106koqnnng/0805-mlcc-smd-capacitors/samsung/
Let me get this straight once and for all. - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: March 15, 2019, 07:29:21 pm
content: Right, Attached is some of my coursework. I am trying to work out haw to calculate harmonic values, For example I am asked for the 101st harmonic, I make that using the big formula on page 3 4.7x10^-32V for a 1MHz pulse lasting 10ns wise a rise time of 100ps.I am troubled by the fomula at the bottom of page 3 that states that the individual sinusoides will be the....... and that is simply the formula for the amplitude at some point in time of any generic sinusoidal waveform and bears little relevance does it not?

author: dmills
author_rank: Super Contributor
timestamp: March 15, 2019, 10:55:07 pm
content: 10^-32 Really? That is small.Hold on :Fundamental is clearly 1MHz (1us period).First breakpoint is at 1/PiTw = 1/(3.1 * 10ns) = ~32MHz.Second breakpoint is at 1/PiTr = 1/(3.1 *100ps) = ~ 3200MHz.Thus the 101st harmonic is on the 1/f slope.Low frequency amplitude is (from figure 4) 2ATw/T, Tw is 10ns, T is 1us, so below the first breakpoint amplitude is 2% of whatever the peak amplitude of the 'square wave' is. And your 101st harmonic is only about 3 times the first breakpoint, so I find 10^-32V highly unlikely.Of course you might have a combination of numbers that happens to give a deep null at that particular harmonic, and I really cannot be arsed to do the sums.Regards, Dan.

author: Simon
author_rank: Unknown
timestamp: March 15, 2019, 11:23:06 pm
content: i made a mistake in the calculation. It is 3.56x10^-4.But here is the thing. My calculations do not make up the graph they theorise and i proved this with my signal generator and oscilloscope in FFT mode. The harmonics drop off and then spike back up at the rise time frequency like my plot does but the material shows an entirely different graph.

author: dmills
author_rank: Super Contributor
timestamp: March 16, 2019, 01:14:36 am
content: I doubt that your AWG is managing 100ps rise time at the scope, being as it is only a 20MHz/250Ms/s unit (so must have a reconstruction filter cutoff below about 100MHz or so).Then your scope will have a rise time measured in ns not picoseconds....Regards, Dan.

author: Simon
author_rank: Unknown
timestamp: March 16, 2019, 08:13:51 am
content: No it's a 6.6ns rise time which is the 50MHz peak. My point is that contrary to the theoretical graph the harmonics due to the principle waveforms frequency die down to near 0 and the Rise time frequency causes a renewed spike in the harmonic content.

author: Zero999
author_rank: Super Contributor
timestamp: March 29, 2019, 10:52:25 pm
content: Probably too late, but have you tried using a simulation package such as LTSpice? I would have a go myself, but that PDF doesn't view on the PC I'm currently using at the moment. I'll try it when I get home on Sunday.

author: Simon
author_rank: Unknown
timestamp: March 30, 2019, 12:53:58 pm
content: Yes i could have a go at what options LTSpice has.
Lets see ... datasheet errors ... (or likely ones ... ) - Page 1
Forum section: electronics / projects

author: 3roomlab
author_rank: Frequent Contributor
timestamp: June 12, 2019, 08:47:40 pm
content: I want to kick off this with infineon mosfetsnumbers are taken from SOA chart 1ms @ 20VAUIRF1324S-7P SOA =42A (D2PAK 7pin)DMN6068 SOA =7A (DPAK)AUIRFR8405 SOA = 30A (DPAK)AUIRFSA8409-7P SOA = 4.5A (D2PAK 7pin)AUIRFS8407 SOA = 40A (D2PAK)I am thinking, the 8405 and 8409 specs are wrong and should beAUIRFR8405 SOA = 3A (DPAK)AUIRFSA8409-7P SOA = 45A (D2PAK 7pin)any thoughts?and feel free to share any other errors/ambiguities

author: 741
author_rank: Frequent Contributor
timestamp: June 12, 2019, 09:19:34 pm
content: Just grabbed the DS {AUIRFR/U8405 12 2017-10-04}. The corner of the 1mS curve, Fig 8, at 20V looks like 30A.That said, they own up to a mistake on that figure in an older copy of the DS"10/17/2014 Corrected label on SOA curve Fig 8 on page 4."

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 12, 2019, 10:22:45 pm
content: Sounds plausible at Tc=25C versus Ta=25C. Does it say?Tim

author: 3roomlab
author_rank: Frequent Contributor
timestamp: June 14, 2019, 03:42:51 am
content: Quote from: T3sl4co1l on June 12, 2019, 10:22:45 pmthe AUIRFR8405 chart says Tc 25Cis there a fundamental thing I am missing?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 14, 2019, 08:32:27 am
content: You can't heatsink a DPAK so that Tc=25C under load, but they rate them that way regardless. Or they often do.Whereas Ta=25C it's doing, a watt or so, and definitely not as much DC current. The difference could easily be 3 vs. 30A. Also matters what the layout is, if it's minimum footprint or, say, metal or ceramic substrate!Tim
Let's talk about agm vs lead acid battery  - Page 1
Forum section: electronics / projects

author: Chriss
author_rank: Frequent Contributor
timestamp: February 26, 2020, 11:41:17 pm
content: Hi!Toady I had a talk with a close friend of mine who bought an agm battery for his bike.The battery arrived in two separated parts.- the battery housing without the liquid in there- a container with the acid liquidWhen we read the user manual and done the things like it is in there we started to talking about what type of charger he need to buy.And this is that interesting part for me too.The agm battery is the same as the good old lead acid battery but the liquid is soaked up to something like toilet paper.Everything else looks for me the same when I opened some of them to see what is in there.Now, there is so many chargers out there and advices how to charge and maintain this type of battery does it really confuse.In the user manual of this agm battery is written does the battery has to be charged with a max current of 10% of the capacity of the battery.So, nothing new compared to the lead acid battery.But these chargers for agm batteries are more expensive then the regular chargers.Then we come across another charger who can charge agm and lead acid batteries but no one switch or any possibility to change from agm to lead acid or vs.Just two LEE's on it and that's it. Charging-red, charged-green.From my perspective of view this two type of batteries are the same. Just the liquid is not in a liquid form in the agm one.But all the parameters are the same like on the lead acid one. And the charging technique is also the same.All that fancy agm charging thinks are just marketing tricks.We are also checked the charging system on the bike of my friends, just to see does there is anything different then on any other bike changing system but we didn't recognized no difference.It is a regular charging system with a regular alternator,diode bridge and a stabilizer. Everything is the same like on a regular car.I have also to say does the bike was bought new several years ago and als with an agm type battery.From my side this battery should also be chargedwith a charging current not over then 10-20% of his capacity and can be charged with a regular car battery charge who has a function to limit the current or an option for bike batteries.What are you think about thesebatteries and maybe there is somebody who are in business with this batteries and can say something more or u documented...Thank you.
Letter Box Monitoring and Alerting System - Page 1
Forum section: electronics / projects

author: jagjeet k
author_rank: Newbie
timestamp: November 20, 2014, 06:06:54 am
content: I made a project based on the above idea and I thougt I would share it here. Also I am using a 9V battery to power this and the batery runs out quite fast, because of the IR transmitter I suppose. Is there any way I can make the battery last longer.http://www.ingenstech.com/projects/letter-box-monitoring-alerting-system/

author: aveekbh
author_rank: Regular Contributor
timestamp: November 20, 2014, 04:53:51 pm
content: Hello JagjeetI see two possibilities - the LEDs and the PIC. The LEDs could be pulsed to operate, say, once in 5 seconds. The PIC - well, it depends on what it is doing all the time.A question - what is the actual purpose of the PIC?- A

author: Wilksey
author_rank: Super Contributor
timestamp: November 20, 2014, 05:04:04 pm
content: All of these projects seem to use a base configuration in terms of hardware, I guess it's some kind of university type project store?Anyway, is this stuff supposed to be open source as there is no source code for the PIC's on the website that I can see.aveekbh, I guess the PIC is generating the 32khz signal for the IR and detecting when the IR beam is broken.

author: Milentije
author_rank: Contributor
timestamp: November 20, 2014, 05:11:10 pm
content: Does PIC run all the time or it goes into sleep mode from time to time? You can do so that the PIC sleeps all the time and be awaken from sleep by IR interrupt. That way you will save a lot of energy. After the letter is recived you can blink the led every 5 seconds or so, as mentioned earlier.EDIT:Also, eliminate one of those "Power ON" leds and you will decrease consumption by at least 3-4 mA. BTW you have 2 LEDs for IR Tx and Rx. It should be one IR LED and one photo transistor.You can do it with light sensor (LDR). While the letter box is closed you have one value of resistance, when the door is opened there is a change in the resistance and you can detect the event.Ofcourse, tie the LDR to one of the pins that is capable of waking up the PIC from sleep and you are good to go.EDIT No2:Why do you have 7805 when you don't need it? As I can see from the schematic, after detailed look, you are using 3.3 V from LM317 for PIC. IR Tx LED isn't hooked to anything by looks of the schematic (there is no VDD net), as well as MCLR pin. You ha VDD_3.3V and VDD_5V from LM317 and 7805, but you don't have any VDD net connected to any kind of supply.Eliminate 7805 totally, and just use 3.3 VREG to supply PIC and other components.

author: aveekbh
author_rank: Regular Contributor
timestamp: November 20, 2014, 05:50:07 pm
content: Wilksey, I had a closer look at the website, and, yes, it seems to be a project store.Jagjeet, perhaps you could incorporate some of the ideas from a similar project by Ben Heck:
LEVEAR/PANASONIC VP-8193D SIGNAL GENERATOR OUTPUT FAILURE when output >100dBuV - Page 1
Forum section: electronics / projects

author: HIFI LOVER
author_rank: Newbie
timestamp: October 16, 2023, 03:09:33 pm
content: Hello,Bought some while ago this Levear/Panasonic VP-8193D signal Generator.everything worked well, but i never used output signals higher than 100dBuV.Now i did need a higher signal, and i found that my output signal collapsed when i adjust the output signal any higher than 100dBuVby Jog or direct input the problem is the same.Anybody knows something about this problem??Like to hear

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: October 16, 2023, 06:27:40 pm
content: Hi,please stop screaming at us.

author: Benta
author_rank: Super Contributor
timestamp: October 16, 2023, 10:52:42 pm
content: "HIFI LOVER", as you didn't get it the first time:All-caps headlines and posts are really, really bad style and turns people off.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 17, 2023, 12:28:32 am
content: i've sent a pm earlier this day ... to politely educate

author: cosminrodu
author_rank: Newbie
timestamp: February 11, 2024, 12:33:15 am
content: You should hook it up to an oscilloscope in order to see what's going on.The output RF amplitude is obtained via a series of attenuators and amplifiers. Here's a rough description.The finer steps in the output RF level are obtained by varying the dc bias level that is injected in the RF block via the AM input.If you inject an AM signal it will swing above and below this dc bias level.This DC bias level needs to be there throughout the entire frequency range of the instrument as it's responsible for keeping a set of PIN diodes polarized.This signal is controlled digitally and obtained via a DAC and is responsible for -4 db and sub increments.Aside from this it has a set of 3 fixed, digitally controled attenuators on the RF board that do -20, -10 & -5 db attenuation.Adding to that, on the attenuator board ( the small can containing the BNC connector) it has a -50, -40 db attenuator plus a +20db amplifier, all of them turned on and off by the digital board.By using all of these in different combinations the digital board can vary the output signal from -20 to +126db in 0.1 db increments.Mind you, the +20dB amplifier kicks in above 106db and is hooked in circuit via a relay, you can hear it click when going from 106 db to 107 db.I have a VP 8194 that had the +20dB amplifier toasted ( among other things) and above 106db no signal was present whatsoever.My guess is that your unit probably has one of the attenuators broken.If you need a service manual let me know.
Level sensor project (3D printed box) - Page 1
Forum section: electronics / projects

author: Wimberleytech
author_rank: Super Contributor
timestamp: January 23, 2018, 05:10:48 pm
content: Here is a project started before I had a 3D printer and had planned to implement using a BUD box or similar.A friend convinced me to buy a 3D printer and that changed everything (even the way I was providing power).I found 18650 power bank on ebay for about a dollar. I harvested the guts out of the power bank, and copied the box design (for mounting the guts) and added space for my board. Much nicer result than going with an OTS box.https://www.thingiverse.com/thing:2674126https://www.ebay.com/itm/Blue-USB-Power-Bank-Case-Kit-18650-Battery-Charger-DIY-Box-Boost-Module/172605629730?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Level shifting 1.65V 1PPS/10MHz clock signals (coaxial,50Ohm) to 3.3V - Page 1
Forum section: electronics / projects

author: dragon5
author_rank: Contributor
timestamp: March 30, 2024, 08:51:22 pm
content: Seems like some of the GPS (GNSS) disciplined oscillators available output a 3.3V (or 5V) square wave for 1PPS and 10MHz on a 50ohm impedance coaxial connectors.For examplehttps://github.com/opencomputeproject/Time-Appliance-ProjectWhat would be a good fast and high-frequency input circuit for level shifting the resulting 1.65 Volt square wave to a 3.3V logic receiver?I looked at the obvious option - the receive direction of the circuit in the TimeCard project but seems this will only work for 3.3V signal (leaving out the 50 ohm terminator) and not with 1.65V. ...https://github.com/opencomputeproject/Time-Appliance-Project/issues/105After some searching I found a nice dual-supply bus transceiver SN74AXC1T45. What I do not like with it is that it is only 3.6V max input voltage limited. I would like something that can survive 5.5V in case someone connects 5V signals without 50ohm terminator. Any thoughts?

author: Nominal Animal
author_rank: Super Contributor
timestamp: March 30, 2024, 09:53:12 pm
content: I'd useTI TXU0101-Q1(TXU0101QDCKRQ1 in SC70), as it supports 1.1V to 5.5V voltages with max. 17ns propagation delay.Other options include 74LVC1T45 for example.

author: Peabody
author_rank: Super Contributor
timestamp: March 30, 2024, 10:14:10 pm
content: The SN74LV1T34 is a single supply (3.3V) translating buffer that would get you from 1.65V to 3.3V, or from 5V to 3.3V.

author: PCB.Wiz
author_rank: Super Contributor
timestamp: March 31, 2024, 01:17:46 am
content: There are plenty of 5V level translators,The VCC min varies with vendor, Diodes 74LVC1T45 is 1.65V whilst Nexperia 74LVC1T45 is 1.2VI see a new Nexperia part 74AXP1T45, claimsWide supply voltage range:• VCC(A): 0.9 V to 5.5 V• VCC(B): 0.9 V to 5.5 V• VI input voltage 0~5.5 V
Level shifting for ADC - Page 1
Forum section: electronics / projects

author: PeterMadach
author_rank: Contributor
timestamp: April 27, 2016, 03:55:34 pm
content: Hey guys!I have some voltage leveling problem I'd like to ask your help with. Sorry if I'm posting in the wrong section, I'm a newbie on this forum (first post lol).So in my application, I have an analog telemetry in the voltage range between -2.5V and +2.5V. I have an ADC in a microcontroller, with an external voltage reference of +2,5V. So what I need, is to convert that -/+2,5V voltage range to the 0/+2,5V range my micro can process. Any thoughts?

author: JacobPilsen
author_rank: Regular Contributor
timestamp: April 27, 2016, 04:00:44 pm
content: OpAmp.Amplify 0.5 (Attenuation 2:1)Add +1,25V.

author: Kalvin
author_rank: Super Contributor
timestamp: April 27, 2016, 04:02:14 pm
content: You may find the following link useful:http://masteringelectronicsdesign.com/design-a-bipolar-to-unipolar-converter/

author: PeterMadach
author_rank: Contributor
timestamp: April 27, 2016, 04:09:12 pm
content: Quote from: Kalvin on April 27, 2016, 04:02:14 pmThat's exactly what I need, thank you both!

author: nctnico
author_rank: Super Contributor
timestamp: April 27, 2016, 04:11:01 pm
content: I have solved similar problems using a passive divider.

author: Kalvin
author_rank: Super Contributor
timestamp: April 27, 2016, 04:14:34 pm
content: Quote from: nctnico on April 27, 2016, 04:11:01 pmIn the link above the circuit is a passive divider with an op amp as a buffer. Sometimes the buffering is not needed, and the circuit will reduce to a simple passive voltage divider.
Level shifting from +5V to 3.3V with 74ALVC164245 - Page 1
Forum section: electronics / projects

author: caius
author_rank: Regular Contributor
timestamp: March 02, 2024, 10:36:14 am
content: Hi all,I have the need to translate some (not bidirectional) +5V signals (from an old TTL hardware) to 3.3V (MAX10 FPGA), I chose a 74ALVC164245 bus transceriver.Are the attached schematics correct?I have some doubts about the VCC(B) power supply pins (if they must tied to 3.3V like I did or +5V instead).Thanks in advance.

author: Psi
author_rank: Super Contributor
timestamp: March 02, 2024, 10:43:35 am
content: If you want to have 5V logic on the B side you need 5V on the B side VCC.

author: MarkF
author_rank: Super Contributor
timestamp: March 02, 2024, 05:32:05 pm
content: If you only need 6 or less lines, the CD74HC4050 Hex Buffer is a simpler and smaller chip.It has high voltage tolerant input protection. You just tie Vcc to 3.3V to drop the levels.

author: Psi
author_rank: Super Contributor
timestamp: March 02, 2024, 09:31:04 pm
content: If it's non-critical a simple voltage divider would probably work fine. but the fact you're working with a FPGA means you should probably do it properly with an IC.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 02, 2024, 10:00:38 pm
content: A BSS138 mosfet circuit with pullups can also work for 5V - 3V3 level shifting, both for translating down a 5V signal to 3V3 and magnifying up a 3V3 to feed to 5V circuits. But would probably lead to a larger part count (mosfet + two resistors, per channel) than using the single IC methods.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 02, 2024, 10:14:34 pm
content: VCCB is 3V to 5.5V while VCCA is 2.3V to 3.6V.So in your case, you must use B as the "input", 5V side, and power VCCB with 5V, and use A as the output, 3.3V side, and power VCCA with 3.3V.As you did, if you power VCCB with 3.3V, you're going to potentially damage the chip as the input voltage on the B side is spec'ed at VCCB max. It's in the datasheet.For a similar use case as yours, I've used the SN74LVC16245A instead, which requires only one voltage rail and is 5V-tolerant. So you'd power its VDD with 3.3V and it will tolerate 5V inputs with no problem. (Of course, it would not translate from 3.3V to 5V, but that's not what you need here as far as I can tell.) I recommend using it, especially if you don't have a 5V rail available on your board.

author: c64
author_rank: Frequent Contributor
timestamp: March 02, 2024, 11:55:12 pm
content: For 6 signals only, can use hex inverters from 74LVC (5v tolerant) family

author: Buriedcode
author_rank: Super Contributor
timestamp: March 02, 2024, 11:59:05 pm
content: Quote from: c64 on March 02, 2024, 11:55:12 pmAnd LCX. The VHC family are also 5v tolerant but can also work up to 5.5V. The exception is the 74VHC245 - only the control signals are 5v tolerant, the IO aren't (since its bidirectional). For unidrectional 5v -> 2-3.3V, I go with the LCX/LVC.
Level shifting with inverting op-amp - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: June 11, 2020, 01:11:23 am
content: Hi,is it possible to level shift an inverting op-amp? If so how? I could not find anything online.Thank you

author: Wimberleytech
author_rank: Super Contributor
timestamp: June 11, 2020, 02:29:39 am
content: Quote from: ricko_uk on June 11, 2020, 01:11:23 amYes

author: xavier60
author_rank: Super Contributor
timestamp: June 11, 2020, 04:23:53 am
content: Quote from: ricko_uk on June 11, 2020, 01:11:23 amSearch for "opamp summing"
Lexan / Polycarbonate etc overlays - Page 1
Forum section: electronics / projects

author: gregariz
author_rank: Frequent Contributor
timestamp: June 16, 2011, 09:14:29 pm
content: Can anyone recommend a decent provider for proto quantities of polycarbonate or similiar overlays?I've yet to see a cheap chinese vendor of these.

author: Time
author_rank: Frequent Contributor
timestamp: June 16, 2011, 09:18:21 pm
content: macmaster? grainger? MSC?

author: gregariz
author_rank: Frequent Contributor
timestamp: June 16, 2011, 09:31:27 pm
content: Quote from: Time on June 16, 2011, 09:18:21 pmThe raw material yes but I would like a vendor that will print my overlay artwork onto the material. I've used a sticker maker that does it but they are limited to what they can do ie transparencies, raised buttons etc.
Lexmark chip TI069A1 - Page 1
Forum section: electronics / projects

author: PON
author_rank: Newbie
timestamp: January 04, 2020, 10:06:18 am
content: Hello,Can someone tell me if try to read , or maybe decode the chip from Lexmark CS720/725, CX725.I'm a beginner in this, so , maybe U can tell me with what controller U can read this (arduino, Rasbery PI), and what program.The eeprom from chip is TI069A1, and is similar like MS/MX, or CS/CX

author: rvalente
author_rank: Frequent Contributor
timestamp: January 04, 2020, 11:44:43 am
content: Do you want to reset it? Get yourself a tonner reset device, plenty of them on chinese sitesDo you want to mess around with it?Is there a small cap to help find vcc and gnd?If not, try measuring in the printer itself, 4 wires suggests i2c.Get yourself a 8$ saleae clone, wire to it, fit the cartridge in the printer and try capturing some data

author: coromonadalix
author_rank: Super Contributor
timestamp: January 04, 2020, 03:06:53 pm
content: Maybe this ?https://fixmyprinter.us/how-to-reset-lexmark-toner-cartridge-chip/And yes they are reset devices who can reset the cartbridge, or with an universal programmer once the pinouts are found, you read a new / never used cartridge, do an eeprom dump, and reprogram the empty one ...If you know the devoce markings, try to find datashhet of it and follow the pins to the 4 pads you see ...

author: Flowerbob
author_rank: Newbie
timestamp: January 14, 2020, 05:24:24 pm
content: Are you still working on this project?I wanted to try the Same thing. My pcb looks different but the chip is the Same.In the Software for the universal programmer this chip is Not available.Couldn‘t find the datasheet for the Chip. Even asked a seller

author: richardamullens
author_rank: Newbie
timestamp: February 01, 2022, 09:24:19 pm
content: My Lexmark C2535 toner cartridges contain that chip also.
Lexmark MS510dn printer toner counter chip - Page 1
Forum section: electronics / projects

author: tomay3000
author_rank: Newbie
timestamp: September 09, 2021, 11:17:13 pm
content: Hello,I have a Lexmark MS510dn printer that works on toner cartridges. Each of them has a chip which I have no clue what it is, and I am pretty sure that has a counter inside it, each time the I print one paper the counter decrements by 1.When the toner cartridge chip count is 0, the printer stops working and asks for a replacement one.The problem is, sometimes the toner chip will be flagged as empty even it is full with toner powder, and I have thrown many full toner cartridges just because of the chip.I have seen different chip resetters in the internet but they are very expensive ($800).What I need is hint about this chip mechanism, and how to pen-test it, so I can reset it.I have taken front and back pictures of the chip, but I can't find any information about it.in addition I already own a TL866II PLUS USB Universal Minipro Programmer and a SIVAVA Willem Eprom Programmer with many adapters.Any help would be appriciated.Thank you in advance.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 10, 2021, 12:05:15 am
content: http://support.lexmark.com/index?pmv=print&page=content&locale=en&userlocale=EN_US&id=HO1328of any help ?or chips like them ?https://www.aliexpress.com/item/32848932072.html
Lexmark toner cartridge EEPROM  IC recognition - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: November 18, 2019, 05:55:33 pm
content: Can someone recognize the EEPROMs below and point any link with datasheets? Both of them are used in Lexmark's C530dn color laser printer as a security for their toner cartridges.The SO-8 belongs to the Lexmark original one while the SO-20 from a 3rd party refilled cartridge.Regards

author: coromonadalix
author_rank: Super Contributor
timestamp: November 18, 2019, 06:08:17 pm
content: Maybe some hints from this thread ??https://www.eevblog.com/forum/projects/lexmark-toner-chip-ti046b1/

author: sdancer75
author_rank: Frequent Contributor
timestamp: November 18, 2019, 06:14:14 pm
content: I have already read it but it's totally different EEPROM.

author: sdancer75
author_rank: Frequent Contributor
timestamp: November 18, 2019, 07:30:26 pm
content: Quote from: edavid on November 18, 2019, 07:23:32 pmIs really a microcontroller or just another EEPROM?Of course a 20pin IC tends to be microcontroller but why? They could use instead a standard commercial EEPROM.Is there a web site that I can find those reverse engineering communication between printer and security chip?
LF data on BP1010 Amplifier IC - Page 1
Forum section: electronics / projects

author: NottheDan
author_rank: Frequent Contributor
timestamp: February 21, 2018, 09:41:47 pm
content: I got a homebuilt amp lying around built around this IC and I can find no data on it online except for an ad in an old issue of Practical Electronics (June 1970). Does anyone know where I can find some actual data on it?
LF: power amp; opamp + darlingron , 50-60V - Page 1
Forum section: electronics / projects

author: GigaJoe
author_rank: Frequent Contributor
timestamp: January 09, 2018, 10:13:16 pm
content: Hello,Would someone provide a tip on an audio amplifier schematic , opamp + darlingtons, V dual - 50-60Volt. ?not a krazy complex one .... I'd like to play\tech myself, using a SONY receiver remains.Thanks, in advance.

author: danadak
author_rank: Super Contributor
timestamp: January 10, 2018, 01:20:31 am
content: Here is a site with archived mags, like Popular Electronics, Electronics World,over the years a number of designs to build were published.http://www.americanradiohistory.com/Popular-Electronics-Guide.htmUsually the Dec or Jan issue had the prior years index of articles.Regards, Dana.

author: GigaJoe
author_rank: Frequent Contributor
timestamp: January 10, 2018, 05:26:42 am
content: Thanks, interesting, but seems nothing in particular in these magazines , actually

author: BrianHG
author_rank: Super Contributor
timestamp: January 10, 2018, 07:15:33 am
content: You can try using a 'OPA452 or OPA453' for +/- 40v range, OPA454 for +/-50v and 'LTC6090 or LTC6090-5' for +/- 70v range, feeding an NPN/PNP matched darlington in a class B or class AB configuration. Make sure you have some safety added series resistors on the emitters and perhaps thermally bonded diodes on the Bases to compensate for temperature thermal runnaway.You can also use audio output opamps like a LM3886, +/-40v, which may drive over 7 amps (you may not want anything else other than to use 2 in parallel and forget about transistors...) to drive your darlingtons or normal NPN/PNP if your goal is a killer strong to the death output current.Don't forget about the possibility to bridge your output, doubling your V-pp, quadrupling audio power.

author: kridri
author_rank: Contributor
timestamp: January 10, 2018, 08:26:38 am
content: You can look to various application note's from venders.By example inthisapplication note (AN18 Linear technology) on page 6 and 7 they are discussing a +-120V output stage for a common opamp.

author: GigaJoe
author_rank: Frequent Contributor
timestamp: January 11, 2018, 12:39:17 am
content: Interesting blog:https://consort3.wordpress.com/Where I found a suitable schematic for me ... will see ...
LFO tick in audio path - Page 1
Forum section: electronics / projects

author: gore
author_rank: Regular Contributor
timestamp: February 01, 2016, 11:41:51 pm
content: Hello. I'm having some trouble with this circuit. Everything seems to be functioning just fine, except there's an audible LFO tick in the audio path. Thinking of decoupling the power supply and separating LFO and signal grounds. Anything else I should keep in mind? Or perhaps there is another way of doing it?Posting a schematic. The bottom one (2) is marked with changes I think of doing.

author: Andy Watson
author_rank: Super Contributor
timestamp: February 02, 2016, 12:03:55 am
content: There is a sense in which you are mixing the LFO into your audio path - so you will always get a certain amount of feed-through - however, perhaps this is not the "tick" that is bothering you.I would look at the biasing of Q2. It is being driven by the phase-shift oscillator - presumably at a few volts signal level ? The output of the oscillator is then A.C. coupled into Q2 - so the gate of Q2 will be swinging both positive and negative about ground potential. I believe Q2 is a JFET (?) in which case the gate will go into forward conduction when the signal swings positive with respect to its source pin - I think this is where your ticks are coming from. You need to move the biasing of Q2 such that gate does not conduct.
LG iG5 Variable Frequency Driver Modbus-RTU - Page 1
Forum section: electronics / projects

author: maurosmartins
author_rank: Regular Contributor
timestamp: August 14, 2021, 06:29:21 pm
content: Hello all,I'm using a LG iG5 Variable Frequency Driver to control a blower. Now I want to control it using RS485, I've already connected it and I'm able to write to the register using modbus RTU.nevertheless I have an issue, in the manual I've found that I must configure DRV-03 (dru) and DRV-04 (FR9) to be 3 and 5 respectively so that I can use modbus-RTU.

author: tonyh88
author_rank: Regular Contributor
timestamp: August 14, 2021, 07:45:59 pm
content: Seems like a rather odd behaviour. I'm not familiar with those iG5 drives unfortunately.What software are you using to test?All I can say is make sure you have all the parameters set correctly as indicated on the page 74 in the manual and i the below screenshot.There seems to be a write enable (address 4) and also I/O50 that needs to be set to ModBus RTU. I didn't see any indications referring to the fact that both the start/stop and speed can't be controlled via Modbus at the same time so I would expect it to work.Maybe try contacting the company if all else fail?

author: maurosmartins
author_rank: Regular Contributor
timestamp: August 15, 2021, 09:31:26 am
content: Hello tonyh88,thank you for your reply.I have all parameters matching the manual also I've enabled write enable and I'm able to update the registers. Tomorrow I'll try more things, any ideas are welcome.Best regards, Mauro.
Li-Ion battery capacity tester - Page 1
Forum section: electronics / projects

author: microbug
author_rank: Frequent Contributor
timestamp: October 01, 2014, 09:26:31 pm
content: I just wanted to share my quick Lithium-Ion battery capacity tester. It's based on an Arduino Mega (although the Uno or pretty much any other MCU could be used), and discharges the battery through a 4-ohm load for approximately 1A of current. I've attached the Arduino sketch as a .txt file as the .ino filetype isn't on the forum whitelist.Yes, I know it's yet another Arduino project / whatever, but I spent some time on it and the info might be useful to someone in order to save them the effort.I'm testing 18650 batteries which I pulled from old laptop batteries.EDIT: I didn't bother with a schematic, but the hardware side is as follows: the battery is connected through a 4-ohm 7W load to the N-channel enhancement-mode MOSFET's drain. The source is connected to the battery's negative terminal and to ground. There's a 47k resistor across the gate and source pins and a voltage sense wire coming from the point the battery's wire gets to the breadboard.

author: void_error
author_rank: Frequent Contributor
timestamp: October 01, 2014, 09:32:21 pm
content: You can use a constant current sink to discharge the batteries. There's an EEVblog video on that.

author: microbug
author_rank: Frequent Contributor
timestamp: October 01, 2014, 09:47:59 pm
content: Yes, but I can't be bothered with a heatsink etc. this does the trick!
Li-Ion battery charging at less than 4.2V - Page 1
Forum section: electronics / projects

author: Mad ID
author_rank: Regular Contributor
timestamp: June 23, 2015, 10:49:12 am
content: Hi,I'm designing a system that must provide long Li-Ion battery cycle life.For that reason I would like to set the charging voltage to 4.0V maximum (instead of 4.2V).In the first prototype I used a LDO MCP1703 @ 4V output voltage. Since the input is from a small solar cell + schottky diode CC mode is provided by the solar cell itself.The problem is that there is 160uA of leakage current from the battery to the MCP when input voltage is 0V. I don't know why that is (I supposed that the LDO will power itself through the FET parasitic diode and draw 2uA of Iq current only, but it draws 80x more)I don't think that placing the schottky in series with the battery (instead at the input) would work well, the battery would charge very slowly when approaching target voltage.Chargers that charge to less than 4.2V are quite rare. Do you know some charger IC or other trick which would allow me to charge the battery to 4.0V and have low reverse leakage?Thanks!

author: djQUAN
author_rank: Frequent Contributor
timestamp: June 23, 2015, 11:52:50 am
content: If you have the room to spare and don't mind going discrete, I think this could be an option.http://belza.cz/charge/liich.htmJust alter the voltage divider for the TL431 reference to suit your application. I have built several versions of it and one was configured for 3.6V for LiFePO4.

author: amyk
author_rank: Super Contributor
timestamp: June 23, 2015, 12:40:04 pm
content: Quote from: Mad ID on June 23, 2015, 10:49:12 amThe 2uA is for when theoutputis disconnected and there is a voltage on the input. Incidentally, most voltage regulators are not designed to work with 0V on the input and voltage on the output - but look for ones with "reverse current protection" that can handle this situation.

author: Mad ID
author_rank: Regular Contributor
timestamp: June 23, 2015, 12:42:10 pm
content: Quote from: amyk on June 23, 2015, 12:40:04 pmHi, that's what I'm doing.Another option is to use an adjustable regulator where I would put a schottky between the output and the feedback resistors. That should work also.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: June 23, 2015, 12:44:31 pm
content: Hi,Have a look at the Linear Technology LTC4064. It is battery charger with a 4.0V output for these applications:http://www.linear.com/product/LTC4064Regards,Jay_Diddy_B

author: Mad ID
author_rank: Regular Contributor
timestamp: June 23, 2015, 12:50:30 pm
content: Quote from: Jay_Diddy_B on June 23, 2015, 12:44:31 pmYes, that's it. The only problem is the price, I'm working on a high volume product.Still think it's possible to get under 0.5$ for 1000pcs+ with an LDO and a schottkyThanks.
Li-Ion battery charging with reverse battery polarity protection - Page 1
Forum section: electronics / projects

author: maxpayne
author_rank: Regular Contributor
timestamp: February 17, 2015, 08:33:50 pm
content: This is my first project based post. I have designed a li-ion battery charging circuit with reverse battery polarity protection for both charger and load. The design is such that, it can protect both BQ24090 and outer load (between LOAD+ and LOAD-) while battery, BAT1 is connected reverse. I dont have the parts right now to test a prototype, so I have posted the circuit here for your valuable critics, whether the design is ok or wrong in any point. Note that there is a low voltage cutoff circuit which is controlled by LTC1998 with cutoff voltage 2.8V.My design requirement is -- Safely charge a single removable 14500 size Li-ion cell at 500 mA via USB- Protect charger and load from reverse battery insertion (while charging and not charging)- Disconnect battery from load below ~2.8v battery voltage- No hidden lead parts (e.g., QFN)

author: richcj10
author_rank: Unknown
timestamp: February 17, 2015, 09:04:26 pm
content: It may be easier to use just a P-mosfet for this. Depending on the mosfet, it will shut off after x volts

author: maxpayne
author_rank: Regular Contributor
timestamp: February 18, 2015, 09:57:02 am
content: Can you describe elaborately how ?

author: maxpayne
author_rank: Regular Contributor
timestamp: February 18, 2015, 09:58:11 am
content: My primary concern is to check if the reverse protection circuitry for both load and charging side design is ok or not ?

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: February 19, 2015, 12:24:40 am
content: Having once blown my laptop by connecting it's USB to something non isolated. I would suggest an isolated charger.You should be able to go throughallthe possible connection scenarios to work out what will happen in each case.either on paper, or in LTSPice or breadboarding some old salvaged parts and ignoring the ICs.Another way to do RP protection is a fuse and a Diode (maybe tvs) obviously this wont self reset but it gives over current protection too.
Li-Ion Battery Management/Monitor/Protection IC Recommendations - Page 1
Forum section: electronics / projects

author: Probb
author_rank: Contributor
timestamp: June 15, 2017, 04:13:05 am
content: Hey guys,I'm messing around on a project that uses Li-Ion batteries as the main circuit source and I'm trying to find an IC that can monitor the battery capacity and maybe provide some over/under voltage and short circuit protection (these last couple options would just be icing on the cake if it came in a fully integrated package). I'm hoping to use an IC that doesn't need to incorporate any kind of micro in the circuit design (it's a mixed signal design that doesn't include any microcontroller), so I'm looking for something that doesn't have any kind of I2C, SPI, or other interface. Just simple hi/lo output signals when the IC detects a low battery capacity...My design will incorporate two 3V 225mAh coin cell (CR2032) Li-Ion batteries connected in parallel. The circuit draws roughly 80mA max and 25mA nominal.I'd prefer an IC that's some kind of SOP or SOT package to make my life a bit easier when it comes to soldering, but if the best option turns out to be an exposed pad DFN package, I won't bitch too much about dragging out the old rework station.Any feedback would be greatly appreciated! I'll be digging deep on the IC research myself, so I'll keep everyone updated if I end up finding something (and if anybody's actually interested).Thanks guys!
Li-ion battery pack wont charge - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: August 30, 2019, 09:03:28 am
content: I just finished assembling a Li-ion battery pack to be used for a powerbank project and although I was able to draw power from it, it doesn't seem to want to take any charge.I am using a 3S BMS (3S6P pack) and my guess is that it is damaged. How can I test the BMS to make sure it's causing this issue?

author: tunk
author_rank: Super Contributor
timestamp: August 30, 2019, 10:26:01 am
content: How do you charge it? A BMS is generally not a charging circuit, only for protection.

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: August 30, 2019, 01:34:37 pm
content: Quote from: tunk on August 30, 2019, 10:26:01 amThis is the BMS I am using:https://www.aliexpress.com/item/32817897264.htmlAs you can see they state the the charging and discharging happens at the P+ and P- terminals which is what I've been using.

author: tunk
author_rank: Super Contributor
timestamp: August 30, 2019, 01:53:09 pm
content: That board is for protection only - it does not control the charging itself.You have to use the normal CC/CV/cut-off charging.In your case constant current until it reaches 12.6V, then constant voltageuntil it reaches 10% of the starting current. If you feed it with more than13.05V (4.35*3) then the over-voltage protection will kick in.

author: digsys
author_rank: Unknown
timestamp: August 30, 2019, 02:06:41 pm
content: Quote from: drummerdimitriQuoteerrrr nope :-) very hard to understand their poor translation but - there is no way that is a charger as well ! It's a standard Vmax limiter .. all they are saying is -whetheryou are charging or discharging, the limiter is active.For that price, I'd be surprised if the FETs or Transistors were genuine.

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: August 30, 2019, 02:12:16 pm
content: Quote from: tunk on August 30, 2019, 01:53:09 pmI am using an external Li-ion charger for that purpose. This is only a protection board with some balancing functionality.

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: August 30, 2019, 10:41:37 pm
content: I got a new BMS but it seems to be designed for 4 batteries in series and not 3 as there is an extra tab to solder onto compared to my previous unit.What could be B3-. The others are self explanatory.
Li-Ion Capacit, and more tester - Page 1
Forum section: electronics / projects

author: iprogramplus
author_rank: Newbie
timestamp: August 04, 2015, 12:50:25 pm
content: hi,i would like assistance or a link to a Li-Ion battery capacity and more tester, using Arduino,i could use help with a design or a link to existing design.thanks,

author: Paul Price
author_rank: Super Contributor
timestamp: August 05, 2015, 08:04:24 pm
content: Testing more is more or less nothing, but when you think about, it is really less to test then more.
Li-ion charger IC with integrated LDO/buck output - Page 1
Forum section: electronics / projects

author: okw
author_rank: Frequent Contributor
timestamp: March 19, 2023, 03:00:14 pm
content: Anyone knows of any any single cell li-ion charger IC (>15V supply, charging current >500mA) that also has an internal 3.3V LDO (or buck >3.5V) with output pin (anything above 300mA would do).I want to use the LDO/back as main power to my circuit, and in case the 12V input drops, it has battery backup. Finding a combo would reduce the PCB size.I was looking at BQ24195L, as it has many other nice features (i2c which can completely disconnect the battery form its internal mosfet, shipping/storage mode, discharge (for battery conditioning), etc). But I don't think I can "steal" 3.3V-5V >300mA from it somewhere.
Li-ion charger - Page 1
Forum section: electronics / projects

author: janoc
author_rank: Super Contributor
timestamp: August 26, 2014, 04:30:34 pm
content: Hello,I am posting this battery charger project, I think quite a few people here could have be interested in it in one way or another.http://nerdralph.blogspot.fr/2014/08/a-5c-lithium-ion-battery-charger.htmlThere are quite a few comments including the designer's here:http://dangerousprototypes.com/2014/08/25/a-5c-lithium-ion-battery-charger/EnjoyJ.