hybridfree/eevblog-posts huggingface dataset:
tinned buss wire vs silver plated buss wire - Page 1
Forum section: electronics / beginners

author: made2hack
author_rank: Frequent Contributor
timestamp: June 23, 2015, 05:44:43 pm
content: Hello,Ok, am contemplating buying some solid core copper wire that is either tinned or silver plated that I can use on a through hole proto board to create interconnects. This is the uninsulated kind that is solid copper but either tinned or silver plated.The Ag plated is 2x or more the price of Tinned copper. Is it worth it? When do you guys use the Ag coated? All the time or only on "Special" projects and can you please define that. I mean yes Ag is better at corrosion resistance and conductivity but is the high price justified? Tin is only 15% the conductivity of Cu, how does that affect current handling of the wire? Does it affect it? Or is it the inside core that matters?Thanks,

author: Zero999
author_rank: Super Contributor
timestamp: June 23, 2015, 05:59:39 pm
content: The thin silver layer only makes any difference at high frequencies, as most of the current flows on the outside of the conductor due to the skin effect.

author: continuo
author_rank: Frequent Contributor
timestamp: June 23, 2015, 06:16:33 pm
content: Such high-frequency circuits wouldn't properly work on protoboards anyway... Besides their higher price the silver plated wires have that annoying habit to turn blackish after some time, due to oxidation. Looks ugly. I wouldn't use them for that purpose...

author: Tandy
author_rank: Frequent Contributor
timestamp: June 23, 2015, 06:23:30 pm
content: Silver is the the best possible conductor but tarnishes very easily. So you might use it for connecting sensors with tiny currents or for very high frequency radio circuits but not general purpose links on prototype circuits.Tinned wire is better general purpose wire because it is easy to solder and tarnishes far less than silver.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 23, 2015, 07:25:52 pm
content: Over what kind of time scale, I guess? Silver tins very well, but will tarnish eventually and then it's harder to tin (if the silver plate corrodes through, it'll also be very slightly higher resistance, but not enough to notice). Tin plate always tins well, though as it gets older and tarnished, it takes a little more flux to work through.If you're going to end up tacking stuff onto it, conductivity probably doesn't matter; the silver will be dissolved by the solder anyway. Might still have some use as coil winding, if you ever to some RF stuff, but not a big deal.Tim

author: made2hack
author_rank: Frequent Contributor
timestamp: June 24, 2015, 06:51:47 am
content: Cool thanks.Will go with the Tinned copper. I don't yet work with High freq.
Tinned wire ends in ferrules? - Page 1
Forum section: electronics / beginners

author: SpannersToSparks
author_rank: Regular Contributor
timestamp: September 04, 2019, 02:22:45 pm
content: HiOut of habit I tinned the end of some wires that will see only milliamps (they are connected to some load cells) and 5-10V. They connect to screw terminals.However, as there were ferrules on hand I wondered about adding them, but noticed the packet says "stranded wire only".Would using ferrules with tinned wires present a problem? I can always just strip back if needs be.

author: Zero999
author_rank: Super Contributor
timestamp: September 04, 2019, 03:05:29 pm
content: I believe it's bad practise to use tinned stranded wire in screw terminals. Tinning the wire makes it more brittle and prone to breaking.As far as ferrules are concerned: no, never tin the wire and the same is true for any crimped connection. Again it makes it more brittle and the solder reduces the crimp's grip, as it is slowly flowing and provides some lubrication.

author: Gyro
author_rank: Super Contributor
timestamp: September 04, 2019, 04:18:31 pm
content: It's not just a matter of making the wires brittle (where the soldered together strands transition to the free ones, often under the insulation). The solder will easily cold-flow over time, removing a lot of the clamping screw pressure.This is much more of an issue for higher current connections, but can still cause unstable connections at low current.Crimped ferrules (on non-tinned wire ends) are an excellent way of terminating stranded wires for use in terminal strips.

author: ejeffrey
author_rank: Super Contributor
timestamp: September 04, 2019, 04:49:55 pm
content: ++Screw terminals on plain stranded or solid core wire is fine, tinning is unnecessary and counterproductive. Crimped ferrules are a nice way to terminate stranded wire especially if it will be reconnected frequently, but are not necessary, although I strongly prefer them at high current. Crimping is also nice if the terminal pitch is tight as it keeps stray strands from shorting out to neighboring contacts.

author: SpannersToSparks
author_rank: Regular Contributor
timestamp: September 05, 2019, 07:42:50 am
content: Thanks everyone, that's exactly what I need
tip solder fume extraction - Page 1
Forum section: electronics / beginners

author: lacek
author_rank: Regular Contributor
timestamp: April 06, 2018, 09:47:26 am
content: Hi,I want to have solder fume extraction through a hose supplemented by the tip fume extraction for a single desk. One option is JBC fume extraction which allows to have two in a single unit, but it is about 2k EUR. Weller say MG 130 is half that, but it does not have a dedicated input for the tip fume extractor (the official way to have tip extraction is to buy WFE2P, but it costs another 900EUR). Is it possible to mount somehow Weller tip fume extractor to the large fume extractor unit (I envision buying reduction from 60mm pipe to the one used in tip extractor in a hydraulic shop). Would this fly?

author: nanofrog
author_rank: Super Contributor
timestamp: April 06, 2018, 11:00:13 am
content: Take a look at theAoyue 933. It's made for tip type fume extraction and it's inexpensive.There's even a thread where another member used one of these with his JBC station (JBC fume extraction).

author: FotatoPotato
author_rank: Regular Contributor
timestamp: April 06, 2018, 03:34:45 pm
content: I have the Hakko FA430. Its not cheap but damn it works so well. If you have the budget for it i would highly recomend it. Just dont get those shitty desktop fans with carbon filters. They dont do anything accept thin out the smoke with more air.

author: macboy
author_rank: Super Contributor
timestamp: April 08, 2018, 08:47:40 pm
content: Quote from: nanofrog on April 06, 2018, 11:00:13 amThe filter in that thing is a complete joke compared to a real unit like Weller WFE2P (which I what I use).

author: nanofrog
author_rank: Super Contributor
timestamp: April 08, 2018, 10:39:12 pm
content: Quote from: macboy on April 08, 2018, 08:47:40 pmI don't doubt that in the slightest. But what you're using is quite expensive, and I suspect well out of the OP's budget.It'd actually be less expensive to get a decent fume extraction unit (non tip based unit), and use it as intended IMHO (i.e. theQUICK6101A1is reasonably priced).
Tips for Safely Probing Secondary (DC) Side of SMPS with DMM - Page 1
Forum section: electronics / beginners

author: Trurl
author_rank: Regular Contributor
timestamp: May 22, 2024, 05:47:48 pm
content: I've "completed" a preliminary schematic of the secondary (low voltage) side of the auxiliary PCB of a HP HSTNS-PD43 server PSU (albeit only the fully accessible side of a double sided PCB - the inner side is almost entirely blocked by the large AC capacitor). I've attached a photo of the auxiliary PCB below for reference. My intention is to probe the section to the right of the opto-couplers (about 2/3 of the PCB).I'd like to "probe" the secondary side's voltages with a multimeter so I can compare actual voltages with those that show up in the schematic's simulation.If I only probe the secondary section with the positive probe while the negative is clamped to the main output section's ground, I'm assuming it should be fine, but I wanted to check with those that have more experience, just in case.What are some safety tips and warnings that should be kept in mind?

author: aliarifat794
author_rank: Regular Contributor
timestamp: May 23, 2024, 10:19:53 am
content: Beware of the capacitors. Capacitors can hold a charge even after the power is turned off. You should discharge capacitors safely before probing the circuit.

author: Laval
author_rank: Regular Contributor
timestamp: May 23, 2024, 11:46:46 am
content: Quote from: Trurl on May 22, 2024, 05:47:48 pmProbing voltages using a multimeter should be relatively safe since it is a high impedance device. You need to take care not to short anything when probing. It is easy on a board like that, which is populated with many small components close to each other, to short something when the probes touch contacts. Use small needle tip probes and some magnifying glass if needed. Of course, keep your hands off the board while probing and your meter close so you don't have to turn around too much to read the value.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 24, 2024, 05:09:12 am
content: You can put a plastic container over the mains voltage section, or wrap it in sturdy plastic and fixate this with for example some pieces of tape. This prevents accidental touches of the primary section while poking around on the secondary side.Do note this is mostly a personal safety thing (it won't kill you anymore), but it's no guarantee for the circuit itself. If for example the feedback circuit Often TL431 with opto coupler) gets disturbed, this may lead to the primary section attempting to deliver full power to the secondary section, which results in over voltages and may blow out IC's and capacitors.The good old trick of incandescent lightbulb in series with the primary is still a valuable trick (although these things are becoming rare). The lightbulb is a PTC. It allows full voltage to the primary, but if the current in the primary becomes too high the light bulb "trips" and limits the current (and also give visual feedback). Just measure the DC resistance of a cold light bulb, and compare it with the nominal voltage / power of it to see how big this difference is.
Tips for soldering enamelled wire (Headphones) - Page 1
Forum section: electronics / beginners

author: sparx
author_rank: Contributor
timestamp: April 29, 2014, 10:28:06 pm
content: Hey guys,I've just had to fix (again!) my pair of Sony headphones (Only a £20 pair, but fantastic bass reproduction).I ended up cutting the wire and resoldering to the jack - stripped off the outer insulation, separated the strengthening fibres from the wire and then dipping it into a blob of solder i'd made and kept hot till it was tinned with the insulation burned off. Not an ideal solution!Anyone got any other good methods? Burning with a lighter/match/flame tends to carbonise the wire making it difficult to tin!Cheers,sparx

author: denelec
author_rank: Regular Contributor
timestamp: April 29, 2014, 10:58:07 pm
content: Have you tried acetone?Or maybe fine grit sandpaper.

author: ejeffrey
author_rank: Super Contributor
timestamp: April 29, 2014, 10:59:33 pm
content: That is the recommended method for most enameled wire. Occasionally you may run across some wire (older or specialty wire) for which that doesn't work, in which case you may need to use either mechanical means (sandpaper, scalpel) or a chemical stripper such as formic acid.

author: lewis
author_rank: Frequent Contributor
timestamp: April 29, 2014, 11:47:16 pm
content: Yep... burn the enamel off with a very hot soldering iron (>400C). Sandpaper is too rough for really thin headphone wire, it will snap easily. It's a real pain in the arse.

author: xwarp
author_rank: Frequent Contributor
timestamp: April 30, 2014, 01:24:05 am
content: I've found that a quick blip with the flame from a lighter burns off the enamel without damaging the wire.

author: Teledog
author_rank: Regular Contributor
timestamp: April 30, 2014, 03:57:17 am
content: I concur with the quick lighter flame method, then if there's any carbon, wipe one-way with IPA, the dip/wipe the wire with rosin flux & tin prior to soldering

author: Frink42
author_rank: Newbie
timestamp: April 30, 2014, 04:45:23 pm
content: The problem with using a lighter is that you can easily deposit carbon in the wire, making for a less than ideal solder job. It's true that you can then clean it, but the tiny conductors are really weak and you have to be extremely careful.A hot soldering iron, flux, and a quick job have yielded the best results for me.
Tips for using PerfBoard - Page 1
Forum section: electronics / beginners

author: Timmy73
author_rank: Newbie
timestamp: June 01, 2020, 09:21:59 pm
content: Hi. I have been making electronics and stuff for a couple years, but I am always terrible at building them on perfboard. I always find that I bridge something, connect wrong wires, and have the solder run through the holes (The WORST) Does anyone have any tips?

author: tggzzz
author_rank: Super Contributor
timestamp: June 01, 2020, 09:38:56 pm
content: 1: show pictures since we cannot comment otherwise2: practice soldering, as shown inhttps://www.youtube.com/playlist?list=PL926EC0F1F93C18373: use Manhattan techniques, they are faster and electrically better

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: June 01, 2020, 10:44:45 pm
content: Quote from: Timmy73 on June 01, 2020, 09:21:59 pmYes, pictures. Show us your soldering iron and especially its tip. What kind of solder are you using?What kind of circuits are you trying to create? Big difference when creating a power circuit vs RF or precision or....P.S. I've made some really cruddy circuits but have never had what I would describe as 'solder running through holes'. What does that mean?

author: Cubdriver
author_rank: Unknown
timestamp: June 02, 2020, 03:38:15 am
content: And what kind of perfboard are you using? Solder running through the holes implies to me that it's double sided and through hole plated. The stuff I've used in the past has been the cheapie single sided Rat Shack boards. I too will (I think at this point third) the request for some photos of what you're getting now - seeing it would help us to determine what's going on.-Pat
Tips for Verifying PCB design - Page 1
Forum section: electronics / beginners

author: bitman
author_rank: Unknown
timestamp: August 27, 2019, 04:15:01 pm
content: I'm an electronics hobbyist; while I've done quite a few circuits on breadboards and prototype boards, I plunged into a real PCB this month for the first time. Of course I screwed up - while I had a prototype of the circuit working on a breadboard I made a mistake on the schematics and didn't see that until I put everything together on the PCB.My question - what methods can I use to verify that the schematics/PCB actually does what I think it does? KiCAD doesn't seem to have a simulator, but in this case it wouldn't have worked since I started in the "simulator" and just made a mistake putting it into a diagram that I used to design the PCB with. My circuit is very simple (<50 components) - I'm left with being a bit puzzled at how you test this stuff on a lot more complex boards. Do you keep producing prototypes, solder everything on and see if that works? Or do you have to develop the skills to discover the mistakes in the schematics?I work with and spend a lot of my time with software development and advanced computer systems. I know how we test/verify software. Things are broken up into smaller pieces and each piece is put together, tested and then multiple of smaller pieces are tested together. There are a lot of different types of tests done - from functional, to error handling, performance etc. What does this look like when designing something physical like a PCB?

author: Ice-Tea
author_rank: Super Contributor
timestamp: August 27, 2019, 04:19:04 pm
content: - Checklists for common mistakes (example:http://pcbchecklist.com)- Peer review

author: JonPyro
author_rank: Regular Contributor
timestamp: August 27, 2019, 10:41:35 pm
content: You can get a correct schematic and still find it doesn't work on a PCB, I have come unstuck with capacitive effects before now which didn't show on breadboard. Board routing can be just as critical to prevent cross talk and other such problems. I have also used a CPLD library footprint that was wrong and spent hours trying to debug the board before I found it.Ultimately, designing pcbs is an art as well as a science!I often design more into a board than I plan to use, like extra component holders for decoupling, or links to connect subsystems that make debugging a lot easier etc.I spent many years home etching and that teaches you alot about making boards. Now China pops them out for a few dollars you can be too quick to order and make silly mistakes.

author: james_s
author_rank: Super Contributor
timestamp: August 27, 2019, 10:50:49 pm
content: I usually send it to a friend and have him look at it, a second set of eyes works wonders.If it's a simple circuit then build another prototype based off the schematic, better yet start with the schematic before you do anything else and then build your first prototype from that.
TI`s CCS  - Page 1
Forum section: electronics / beginners

author: stoyanoff
author_rank: Contributor
timestamp: June 24, 2020, 04:55:11 am
content: Greetings! I`m using TI`s CC studio for a few week and I have some questions!First: My project is created as a renamed example project for InstaSPIN lib. And in the General property tab it is sellected "Generic C28xx Device". So if I which to my controller(F280041C) I am receiving multiple errors like "#10263 BEGIN memory range has already been specified". And when I return the Generic C28xx Device setting I can`t compile the project -> errors again. What is happening here?Second: If I haven`t set the proper controller how the CCS is going to find out if there is enough space, how much is left and so on?Third: I can`t program my uC in release mode. In debug mode everything works fine, but when I use "load" nothing happens -> the program doesn`t work... Any ideas?Thanks!

author: MosherIV
author_rank: Super Contributor
timestamp: June 24, 2020, 07:25:36 am
content: You have my sympathies for using anything Eclipse basedA2 if you have not chson any specific micro or generic family, it is either up to you to specify the address space or the linker is going to assume you have infinite spaceA3 the release mode may not be configured correctly. Compare the release mode setting with the debug mode. The main difference between debug and release is release will not include the symbol names in the binary blob for debugging.If you do not care about leaving variable names in the binary blob, just use debug.

author: stoyanoff
author_rank: Contributor
timestamp: June 24, 2020, 11:42:32 am
content: Ok! In the project I have a file called f28004x_ram_cpu_is.cmd which contains the memory definitions. It is exactly for my uC. If we assume the memory map is made exactly for my uC, so the space is not unlimited, but defined in this file. And it should return an error if I`m out of space...Thanks!

author: Bassman59
author_rank: Super Contributor
timestamp: June 26, 2020, 04:54:43 am
content: Quote from: stoyanoff on June 24, 2020, 04:55:11 amDefinitely import one of the example projects that is based on your device and spend some time looking at the various project settings and files. The examples all build so you'll be able to see what the hell is going on.I find that this was the only way to get going with any vendor's Eclipse-based tools, including at last count TI CCS, NXP MCUXpresso, SiLabs Simplicity Studio.

author: mayor
author_rank: Regular Contributor
timestamp: June 26, 2020, 10:27:09 am
content: Echoing Bassman59's suggestion. There are too many includes pointing to too many locations in the SDK to start from scratch. TI provides an "empty" project, which is as close to "from scratch" as you should attempt (it's a LED blinker). But besides, it's best to find an example project close to what you want to accomplish and modify it to suit your needs.
TJA1051T - Page 1
Forum section: electronics / beginners

author: Robert Stone
author_rank: Newbie
timestamp: November 03, 2024, 12:24:29 pm
content: I wonder How can I use this module? when I connect this converter to my laptop, no COM port is recognized. I have downloaded a few CAN analayzer software , but the module is still not detected.https://i.postimg.cc/W129YjyQ/image-2024-11-03-T11-43-32-959-Z.png

author: dietert1
author_rank: Super Contributor
timestamp: November 03, 2024, 03:06:14 pm
content: As far as i remember TJA1051T is a CAN interface. What is the other, bigger chip in your adapter? It should be some USB capable MCU or another USB interface. Maybe you need to find a driver for that chip. The search term appears to be "CANABLE X1" or go here:https://canable.io/getting-started.htmlRegards, DieterEdit: Somewhere else i found a better image and the MCU appears to be a STM32F072. ST offer USB drivers for their STM32 MCUs for download here:https://www.st.com/en/development-tools/stsw-stm32102.html.
TJA1053T CAN transceiver to UART - Page 1
Forum section: electronics / beginners

author: symbianas
author_rank: Regular Contributor
timestamp: June 27, 2020, 07:07:21 am
content: Hi, is it possible to read CAN messages coming from TJA1053T CAN transceiver with UART module?

author: Rerouter
author_rank: Super Contributor
timestamp: June 27, 2020, 07:21:58 am
content: Not really, you have variable lenght messages that are not the same as UART spec,You would need something like ahttps://www.microchip.com/wwwproducts/en/en010406to actually handle the translation (that chip is SPI, you would need a UART one,Alternatively, just us an ELM327 module and be done with it?
TL3844BDR-8 Oscillator Frequency? - Page 1
Forum section: electronics / beginners

author: Kronkulus
author_rank: Contributor
timestamp: August 29, 2022, 02:48:10 am
content: Hey all!I'm trying to design a flyback converter with the TL3844BDR-8. I'm in the middle of going through all the design equations, and I've come across something that is just confusing the bajeezus out of me.I'm not sure if I'm allowed to post figures from datasheets, so I'll just describe what I'm seeing to the best of my ability. I chose a maximum duty cycle of 45% for the design, and a graph in the datasheet shows that Rt must be greater than 3.5k to meet this requirement. Alright that's fine. Then TI gives an equation for oscillator frequency:f = 1/(Rt*Ct) if Rt < 5kf = 1.72/(Rt*Ct) if Rt >5kDirectly below these equations is a graph with multiple lines, Y axis is Rt, X axis is frequency. Each line is showing how the oscillator frequency changes with the timing resistor for multiple different timing cap values. According to this graph, an Rt of 4k with a Ct of 4.7nF should give me close to 100kHz. Plug those into the equation above and you get about 53kHz. Am I going nuts, or is there something I'm not understanding about what these graphs/equations are telling me?

author: Kronkulus
author_rank: Contributor
timestamp: August 29, 2022, 03:01:31 am
content: I may have found my answer, all I had to do was post in the forum, works every time!I think the graphs are showing the Rt>5k line, but they continued them down below 5k for some reason. As Dave would say, TRAP FOR YOUNG PLAYERS.
TL431 component test + impact of bad TL431 in PSU - Page 1
Forum section: electronics / beginners

author: ddewaele
author_rank: Newbie
timestamp: September 01, 2020, 02:50:02 pm
content: Hi,I pulled a TL431 adjustable zener from a "broken" PSU, not really sure if the TL431 is still in working order.I did a diode test between the kathode and anode and that checked out fine, voltage drop on one end, OL on the other.But I wanted to see it in action in a circuit so I hooked it up like this :Code:12v ------> 330ohm resistor ----> REF pinAnode pin -------> GNDNow on the cathode pin I was expecting to see a 2.5v output voltage but that wasn't the case. I was seeing something like 6v.I then pulled another TL431 from a working PSU and inserted it in the circuit above and voila ... 2.5v output on the pin.Would that imply that the first TL431 is defective, and what kind of impact would such a component have in a switch mode power supply ?From what I understand it is used in the feedback circuit together with the opto-coupler and will ultimately control how the switching of the power transistor occurs.Is it possible that wrong readings coming out of the feedback circuit could cause some issues on the hot side of the power supply ?

author: mikerj
author_rank: Super Contributor
timestamp: September 01, 2020, 03:31:34 pm
content: That's not how a TL431 works, it's a shunt reference. Tie the cathode and the reference pins together, put your current limiting resistor between your supply and the cathode/reference connection, ground the anode and you should have 2.5v across the device. 330 ohms will limit the current to ~29mA which is within the capability of the TL431 but is a quite a lot higher than you'd typically run this device at as a voltage reference.

author: ddewaele
author_rank: Newbie
timestamp: September 02, 2020, 03:53:11 am
content: Quote from: mikerj on September 01, 2020, 03:31:34 pmThat's how I wired it up , I see now how my description was not clear. Apologies for that. Here's how it was wired up (taken from Ludic Science :) :But REF and cathode were indeed tied and I measured . Tried different resistor values but I think it should always output 2.5VBut like I said I have 1 TL431 that doesn't do that .... it was outputting something like 6v. What kind of an impact would that have in a PSU.

author: magic
author_rank: Super Contributor
timestamp: September 02, 2020, 05:59:39 am
content: Then it's broken.If a PSU uses it on the secondary to regulate output voltage, the output voltage will be regulated too high.There is also the possibility that it's some cost-reduced TL431-like chip which simply cannot sink 30mA. Try higher resistance. Those regulators work correctly down to 0.1mA of current or something like that.
TL494 push pull output stability issue(s) - Page 1
Forum section: electronics / beginners

author: CPaltenghe
author_rank: Newbie
timestamp: November 30, 2022, 08:08:54 pm
content: Hi Folks!I am new to this forum and hoping someone can give me some insights.I am building a TL494 based push pull circuit to be used in an inverter, but I am not even to the power stage yet.Scoping the unloaded output of the push pull circuit (see attached screen shot), one can clearly see the erratic pattern.I do not know where to look for the cause of this.I have checked for cold solder joints, jiggled the components, tweaked the pots up and down, to no avail.See circuit diagram and build layout pictures.Any debugging and places to check advice will be greatly appreciated.

author: CPaltenghe
author_rank: Newbie
timestamp: November 30, 2022, 08:14:12 pm
content: P.S. There is an error in my diagram, but not on the board. Pin 16 is grounded.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 30, 2022, 10:32:28 pm
content: Put a bypass on VREF. The output control pin is very sensitive to noise. It's not a logic level input, it's... something of a bad hack internally (internal diagrams are actually available for this chip, so this is known).Tim

author: CPaltenghe
author_rank: Newbie
timestamp: November 30, 2022, 10:52:31 pm
content: Thank you, Tim.What does bypass mean to you?Currently, VREF (pin 14) is tied to 13 (output control) and 15 (in 2-).Where would I bypass VREF to?Just a wire, or a capacitor?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 30, 2022, 11:43:30 pm
content: Bypass cap, VREF to GND, near the chip.Tim

author: CPaltenghe
author_rank: Newbie
timestamp: November 30, 2022, 11:46:50 pm
content: Thanks again, Tim.Sorry to be obtuse, but what about pins 15 and 13 that are already tied to 14 (VREF)?Leave them in place and put a cap from 14 to ground?Or, disconnect them but tie them to what?(I'm still learning)

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 01, 2022, 12:07:04 am
content: The net, not the pin. Any will do. There is maybe 10nH between the three positions, not enough to notice or care where exactly you put it.Tim

author: magic
author_rank: Super Contributor
timestamp: December 01, 2022, 10:31:20 am
content: I'm not entirely sure if this is a TI chip or a Chinese clone.I suppose they ought to be functionally equivalent, but hell knows what devils are in the details...I would scope all the pins to confirm that the waveforms are as expected. DC where it should be DC, clock where it's supposed to be clock, etc. See how the two outputs correlate with each other.
TL494 PWM will not operatate in push-pull despite pins 13 and 14 being shorted - Page 1
Forum section: electronics / beginners

author: Verliebt_in_München17
author_rank: Newbie
timestamp: May 17, 2024, 10:13:55 pm
content: My trigger was set to alternate.So the circuit works comepletly fine, it's just that the IC won't seem to work in a push-pull configuration, which i want it to be, i have triple checked every connection possible, and i have concluded that my circuit design could be wrong so i need somebody to help me find any other triggers that could lead the IC to stay hard-locked in single-ended mode.I will be providing addition information and pictures upon request.SchematicUndersideComparision of the sawtooth wave on pin 5 and one of the outputsMy bad if the images are too large, no idea how to make them smaller

author: Benta
author_rank: Super Contributor
timestamp: May 17, 2024, 10:39:03 pm
content: The whole upper half of your circuit is dysfunctional.You have three inputs connected together, but none of them are driven by an output or a voltage source. On top of that, there's a questionable "capacitor divider" with no apparent purpose.

author: DavidAlfa
author_rank: Super Contributor
timestamp: May 17, 2024, 10:45:41 pm
content: The TL494 outputs are made by NPN BJTs, so depending on how you connect them, they can push or pull, but not both.You can combine both outputs for a full push-pull stage, IIRC you can do so with this:- C1 to VDD.- E1 and C2 connected together, this is the output.- E2 to GND.Your circuit doesnt make much sense. How do you expect it to work without any feedback?If you want to test the PWM output with a potentiometer, try the test circuit included in the datasheet.

author: xavier60
author_rank: Super Contributor
timestamp: May 18, 2024, 01:38:43 am
content: The DSO shows the output being half the oscillator frequency. That indicates push-pull mode.The output signals are expected to be antiphase to each other.EDIt: It's odd that the output transitions don't align with the step in the oscillator sawtooth.Maybe the DSO is set to Alternate Trigger mode?Maybe this explains the original problem. The 2 outputs will appear to be in phase.

author: Verliebt_in_München17
author_rank: Newbie
timestamp: May 18, 2024, 03:43:31 pm
content: Yes, the scope's trigger is set to alternate beacuse i was getting an unstable reading, i'll try to see if the problem was with my scope all alongedit: yes it was, thanks for correcting my newbie mistake

author: xavier60
author_rank: Super Contributor
timestamp: May 19, 2024, 01:02:44 am
content: The DSO will have settings to improve triggering stability that can be experimented with.Starting with selecting a fast transition to trigger from. For example, the negative step of the oscillator waveform rather than the positive going ramp.
TL866 programmer in need of maintenance - Page 1
Forum section: electronics / beginners

author: Mp3
author_rank: Frequent Contributor
timestamp: January 07, 2019, 08:51:28 pm
content: Hello all.I have an old TL866CS EPROM programmer. It gets a lot of use. At this point it will not recognize a chip unless i press down on it with lots of force and lock it in place. Even then i sometimes need to get it in just the right place.It seems to me the socket is either becoming loose or very dirty. How would anyone recommend fixing this issue? I dont know how these sockets work mechanically, so i'm not sure where to start with trying to fix it.I have a shelf spare TL866 in case this one dies but i would like to run it for as long as possible before replacing it. I have already repaired the usb port on it and hope to not give up on it quite yet.

author: tsman
author_rank: Frequent Contributor
timestamp: January 07, 2019, 09:02:49 pm
content: You checked to see if there are any broken solder joints on the ZIF socket or the daughterboard the ZIF socket is mounted on?
TL866 reads a different content every time - Page 1
Forum section: electronics / beginners

author: cpt.charlie
author_rank: Contributor
timestamp: April 13, 2017, 12:48:43 am
content: Hi, i have a couple of old PC motherboards that won't post and i think it's a problem related to the bios.These boards use PLCC32 socketed chips, the chip models are:Pm39F040-70JC (PMC flash)W49F002UP12B (Winbond)I installed the chip in the adapter, selected the right manufacturer/model and clicked read, then i get the content, but if i use the verify function i get many errors 8000-13000, every time a different amount, erase chip is suposed to work but if i check it the chip seems to be intact, if i try to program the chip, at some point i get a buffer error, my questions are, is this a possible behavior of a damaged flash chip? can i replace the chip with another of the same series and capacity? i have found some chips that even selecting the right configuration the chip ID is read as FF FF does it mean this chip is damaged too?i'm running the latest software version (6.5) and the latest firmware, the adapter works fine as i can read/program correctly other 39f/49f chips and the programer passes the self test, i've been sucessfull with 25 series chips so i'm confident it's not a problem of my programmer.
TL866 SelfTest Failure - Page 1
Forum section: electronics / beginners

author: seanant
author_rank: Newbie
timestamp: January 07, 2015, 07:09:26 pm
content: Hello. I am not sure but when I plugged in my 866 and ran the self test I am getting #5 failure under the VCC section. Why am I getting this? I have tried on a couple of PC's, cables.Thanks in advance

author: bretele
author_rank: Newbie
timestamp: January 27, 2015, 09:52:59 am
content: I have the same problem. I wrote to manufacturer for help, he told me that error cannot be repaired by myself, it has to be sent back for repairing, after that told me that for customers outside of China the distributors cannot offer that kind of warranty, because of shipping costs.Therefore, cheap product, no warranty, no support from manufacturer.
TL866 won't read chip even though its supported :/ - Page 1
Forum section: electronics / beginners

author: leham
author_rank: Regular Contributor
timestamp: July 21, 2017, 07:19:20 am
content: trying to read a W49F020T-90Bthe TL 866 software says the chip is supported, I'm using the correct adapter but chip ID is just FF and fails all functions (read, program ect..)I know its not the socket because I can read other tsop chips.The chips aren't blank

author: leham
author_rank: Regular Contributor
timestamp: July 21, 2017, 09:55:56 pm
content: any ideas?

author: Brumby
author_rank: Unknown
timestamp: July 22, 2017, 02:15:24 am
content: Be patient. Not everyone who might be able to help will look in here twice a day, every day.I expect someone will chime in in the next couple of days.

author: leham
author_rank: Regular Contributor
timestamp: July 29, 2017, 02:36:35 am
content: sorryit's just confusing me

author: leham
author_rank: Regular Contributor
timestamp: July 31, 2017, 03:06:15 am
content: anyone have some ideas? I tried to use older software but it says its too old??

author: amspire
author_rank: Super Contributor
timestamp: July 31, 2017, 03:24:40 am
content: Don't know if you are running foul of the chip's boot block lockout protection.From the data sheet:QuoteI will leave it to you to work out what that means. A programmer should be able to read a write-protected chip, but the TL866 may decide not to.

author: leham
author_rank: Regular Contributor
timestamp: July 31, 2017, 09:26:11 am
content: How would I determine if that is the case and is there anyway around it?

author: Rbastler
author_rank: Frequent Contributor
timestamp: July 31, 2017, 09:30:25 am
content: You could try to turn of chip idSent from my A0001 using Tapatalk

author: leham
author_rank: Regular Contributor
timestamp: August 06, 2017, 03:51:07 am
content: ok ended up having to change the chip type to a W49F002U and disable Check ID.It now works!Thanks everyone

author: JoeO
author_rank: Frequent Contributor
timestamp: August 06, 2017, 01:41:16 pm
content: Thanks for posting your solution to the problem.

author: Spanaz1
author_rank: Newbie
timestamp: September 13, 2017, 06:02:43 am
content: Hello Guys,Newbie here. I have a problem with my Tl866CS now changed to A using this forum method. But my problem was the programmer suddenly stopped reading anything it will act like it's reading but after verify there will be all ffffff it even read when there is no chip. What can be the problem?
TL866A programmer in-circuit - Page 1
Forum section: electronics / beginners

author: keenox
author_rank: Contributor
timestamp: December 03, 2017, 12:50:57 pm
content: Hello,I recently bought a TL866A programmer and was playing with it. I noticed it cannot read EEPROMs in-circuit. With the chips desoldered, it works no problems.I also tried powering the circuits, but it still doesn't work. It doesn't say OC protection, it simply reads only FFs.With a cheap CH314 programmer it works in circuit no problems.Am I doing something wrong or the TL866A is incapable of reading/writing in-circuit? If so, why would it be a problem?Thanks!
TL866A USB Programmer, what adapter for DIP8 (Winbond 25Q32BVAIG) chip? - Page 1
Forum section: electronics / beginners

author: dexvx
author_rank: Newbie
timestamp: October 23, 2017, 04:29:11 am
content: Hello, my Asus P67 Sabertooth motherboard does not boot (CPU_LED is red on power up). Its BIOS chip is a DIP8 (I think that is the correct term) Winbond 25Q32BVAIG, and I would like to read it to see if it is corrupt. I have a TL866A USB programmer like below:http://autoelectric.cn/EN/TL866_main.htmlThe 25Q32BVAIG looks to be 3V (so no need for 1.8V adapter) DIP-8 package (300mil, not sure what that means?) measuring 6mm x 9mm. The datasheet is at below link. However, there does not appear to be a DIP8 socket (or clamp) accessory for the TL866 that fits. I was hoping for someone to point me to the correct accessory.http://www.datasheetq.com/datasheet-download/853233/0/Winbond/25Q32BVAIGThanks

author: ElektroQuark
author_rank: Unknown
timestamp: October 23, 2017, 07:10:02 am
content: The TL866 can read/write compatible devices in PDIP package directly with the ZIF. You don't need any adapter.DIP8:

author: gamalot
author_rank: Super Contributor
timestamp: October 23, 2017, 07:17:03 am
content: Quote from: EdoNork on October 23, 2017, 07:10:02 am+1 The ZIF connector is 300/600 mil compatible.

author: dexvx
author_rank: Newbie
timestamp: October 24, 2017, 01:26:19 am
content: Wow, I feel dumb, I never thought about putting the little guy right into the ZIF.Looks like the chip reads (as 25Q32BV SOIC8).
TL866II-Plus don't support XM25QU128B - Page 1
Forum section: electronics / beginners

author: Francisco.s
author_rank: Contributor
timestamp: March 02, 2022, 07:41:03 pm
content: Hi,need to program a XM25QU128B flash memory chip but my TL866II seems not support this chip.TL866II detects this chip but can not read or write its contents.This is the message it show:APP Version : 11.81 Model : TL866II PlusDevice : XM25QU128B @SOIC8TL866II-Plus don't support this chipIt is funny that it detects the model of this chips and then it says that don't support this chip.If I select W25Q128FW trying to overcome this problem, it reads it but all reading bytes are "FF".Can someone point me how can I read and write this chip?Is there a way to hack TL866II in order to program this flash chip?
TL866II Plus not pulling RST low enough on a miniPro clone..... - Page 1
Forum section: electronics / beginners

author: hazzer
author_rank: Regular Contributor
timestamp: June 03, 2022, 10:30:26 am
content: Beginners question on the TL866II Plus ( Firmware V04.02.128 ) and Xgpro V11.90.Im trying to programme a 5V 16Mhz Arduino ProMini (Clone) over ISCP using a TL866II Plus.It fails to programme or even read the chip ID, looks like the RST line isn't pulled low enough by the TL866,and looking at the clone MiniPro board I can see a 1K pull up resistor on RST.If I removing this 1K resistor then it all works and I can then programme and read the ProMini 328P contents as expected.....but I would have thought the TL866 would be able to pull a low voltage on the RST line through a 1K resistor?attached is a screen grab of the RST line with the 1K resistor in circuit, the RST is pulled down to 1.4V ( from 3.6V ... )and the VCC supplied by the TL866 is 4.5V.Question... is this what you would expect - or might there be a problem with the TL866???ThanksHarry

author: m k
author_rank: Super Contributor
timestamp: June 03, 2022, 01:48:58 pm
content: Yes - No.2mA/pin is pretty much.

author: Mechatrommer
author_rank: Super Contributor
timestamp: June 03, 2022, 01:53:30 pm
content: have you bought this?https://www.aliexpress.com/item/33047996482.htmlQuoteeither that, or increase the pull up resistor value to the recommended value for the in-circuit-programming originally (4.7-10kOhm), i normally used 10kOhm to save the world's energy consumption... TL866II+ is a trap for young players, i have to buy many adapters that cost nearly as the programmer itself because i want to program some flash chip, and to ensure i can program many others... ymmv.https://onlinedocs.microchip.com/pr/GUID-F626284A-58F0-4C25-A6F3-0EA5054F3E2B-en-US-6/index.html?GUID-B80B25FF-E9D7-4766-B562-DA197B8B938C

author: Peabody
author_rank: Super Contributor
timestamp: June 03, 2022, 02:13:56 pm
content: The schematic I have for the Pro Mini has a 10K resistor on the reset pin, and a 0.1uF capacitor in series to the DTR pin.

author: hazzer
author_rank: Regular Contributor
timestamp: June 03, 2022, 02:17:13 pm
content: Thanks for the links, yes the TL866 adaptor looks useful, later I want to look at DebugWIRE so moving the clone miniPro board to a 10k resistor is prob what I will do.I did ask on the webpagehttps://xgecu.myshopify.com/collections/tl866ii-plus-programmerand was told ..." XGecuYou can adjust the VCC CURRENT IMAX to 350MA, if it still doesn't work, you need to disable the ICSP VCC ENABLE, then the target board power supply".but on my software the current is locked to default (120ma) and greyed out, I think this is pretty standard,unless someone knows how to unlock the current setting? but that's for another post...thanks again - 10K it is....Harry

author: hazzer
author_rank: Regular Contributor
timestamp: June 03, 2022, 03:58:50 pm
content: Just to close, replacing the 1K RST pull up resistor with a 10K resistor on the (cloned) MiniPro board has fixed all the issues.Thanks for all the suggestions and links.73Harry
TLC4502D with PH sensor - Page 1
Forum section: electronics / beginners

author: Buddhi19
author_rank: Newbie
timestamp: September 15, 2023, 03:22:13 am
content: I'm using TLC4502D IC to amplify the PH sensor output as in the diagram. It was observed that the output is lower and not constant( not converging) for the same PH sensor probe when I tested with multiple ICs of the same type. Is there any reason for this improper amplification?A reference voltage of 1024 mV was given by LM4140 IC to the pin number 5. R7 is 20k and R6 is 10k. I want to have the output in the range 2.8-3.7V (when the prob is connected to some TLC4502D it gives an output in the required range but some don't. I want to find the reason for that)I want to have the output of the IC in a fixed range and should converge quickly.

author: Terry Bites
author_rank: Super Contributor
timestamp: September 16, 2023, 12:43:54 pm
content: By converge, do you mean "settle" to a final value?I'd be looking for sources of parasitic capacitance and leakage currents at the opamp inputs.A teraohm of input impedance needs to be treated with the utmost respect.Your components and pcb need to be scrupulously clean. No dirt, flux residues or finger prints. It will fail to work as hoped as a breadboarded circuit.Use guarding techniques. microchipdeveloper.com/opamp:leakage-currentsIs the opamp oscillating? Sensor and cable capacitance at the non-inv input can cause stability issues. If it is, add a small cap across R7. Guesstimate or measure your cable plus sensor capcitance. The feedback cap needs to be at least that value. pH sensor cables have a typical capacitance of 50-100pF per metre.You can neutralise this capacitance with a bootstrapped shield. A "driven shield" is a better option.The shield driver opamp doesn't need to be anything special. The resistors keep the feed back below unity, that stops the bootstrap causing oscillation.
tlc555 soic 8 pin 1 ? - Page 1
Forum section: electronics / beginners

author: nikki81
author_rank: Newbie
timestamp: March 16, 2022, 04:05:32 pm
content: Hi i am building a project that uses a tlc555 soic 8 package but there is no pin 1 identifying dot just a horizontal band please could someone tell me how to locate pin 1Thanks Nikki

author: jpanhalt
author_rank: Super Contributor
timestamp: March 16, 2022, 04:36:19 pm
content: Hold the chip so the white line (shown here in red) is at the bottom. #1 is the pin on the far left.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 16, 2022, 04:49:57 pm
content: Hold the chip up to the light. One side of the ic has a sloped edge. Turn it so that edge is on the right hand side. Pin 1 is at the top right.https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/deaa8e36fedfbb11be15356606ef9348/large.png

author: nikki81
author_rank: Newbie
timestamp: March 16, 2022, 04:51:56 pm
content: brilliant thank you !
TLC59711 LED Strip Driver - Page 1
Forum section: electronics / beginners

author: 24602
author_rank: Contributor
timestamp: January 18, 2025, 06:42:26 am
content: Hey All,Working on driving 12-24V LED strips from a TLC59711, I have attached a schematicJust need a double check of the work and confirm would the Gate voltage be ok at 5V?Need a double check if my Transistor and mosfet combination is correct.Will be driving approximately 1A of LEDs per channelThanks!

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: January 19, 2025, 06:06:24 pm
content: You can add a small gate resistor (e.g., 10Ω) in series with the MOSFET gate. It will limit the inrush current.

author: Ian.M
author_rank: Super Contributor
timestamp: January 19, 2025, 07:08:38 pm
content: What inrush current?The gate charges to turn on the MOSFET via a fricking 10K resistor!Edit: The driver is too slow to turn the MOSFET off except at extremely low duty cycles due to the 10K pulldown being the only discharge path for the gate charge, and inrush is limited by the gain of the SS8550 and its <0.5 mA base current. At 150 mA (max possible current the SS8550 can supply), the effect of a 10 ohm gate resistor would be negligible.The PWM period is about 50us, (nom. 10MHz internal greyscale clock divided by 512, see datasheet: Figure 22. ES-PWM Operation) and I suspect the above gate drive circuit will be *far* too slow.Edit: confirmed by simulation. Wont work!