hybridfree/eevblog-posts huggingface dataset:
TL866 Bricked revisited - Page 1
Forum section: electronics / projects

author: jonpaul
author_rank: Super Contributor
timestamp: November 17, 2020, 08:07:26 pm
content: Hello all, have the old TL866CS prom programmer from the notorious Chinese XGecu.Stupidly I "undated" the Firmware and its OF COURSE bricked, "serial not valid" even though it IS the original non-clone device.In 2018 and before our forum had many threads and pages on unbricking, FW versions, bootloading and so on.Now 3 years later, many of the links are dead. And hard to get the info I need in threads that are 50- 75 pages long!I urgently need to get it gong and cannot bear to pay another $50 to these crooks!Dont need to convert ver CS to Ver A but either way would be very happy!I am seeking:1/ Current link to the FW reset and unbricking SW?2/ Current links to the FW versions that are known to work and NOT brick?3/ Windows SW to run it?Note that I use Windows 10 Pro on a PC and have no acess to Lunix, etc.Many thanks for your kind assistance!Jon

author: oPossum
author_rank: Super Contributor
timestamp: November 17, 2020, 09:01:19 pm
content: https://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/msg1704092/#msg1704092

author: coromonadalix
author_rank: Super Contributor
timestamp: November 17, 2020, 09:16:12 pm
content: here ya goi had problems with windows 10 64 bit when you update the firmware, it simply bricked the device .... no device found in device manager, re flashed the update with an 32 bit machine and was fine after

author: coromonadalix
author_rank: Super Contributor
timestamp: November 17, 2020, 09:25:30 pm
content: http://www.autoelectric.cn/MiniPro/minipro_setup682.rarsupposed to work with hacked devices, just downloaded it again to test the link, hurry lollhttp://www.autoelectric.cn/MiniPro/minipro_setup685.rardetect the hacked versions it seems

author: jonpaul
author_rank: Super Contributor
timestamp: November 17, 2020, 09:52:15 pm
content: Wow mille mercis...rapide réponse:To OPossum: Yes I had that thread!To coromonadalix: Mine was never hacked just the original unit, that was bricked in "update FW"Assume must enter boot first with 100 Ohm R?Which FW and method for Serial do you suggest forRetain TL866ACUpgrade to TL866A?Where to get the FW file used in the update SW?Many thanks againJon

author: coromonadalix
author_rank: Super Contributor
timestamp: November 18, 2020, 02:27:36 am
content: Dont forget ... the makers had fw updates problems with some 64 bit ose's, the tl866 dont get enumerated in windows, but the bootloader was accessible to re-flash it againIt could be that problem you have, you can update the board with 32 bit os ... and after it will work fine in 64bit sytemThe fw update come with each version of minipro, you have the update *.dat file in the minipro installation directory to push with the tl866 firmware tool or use minipro for the update
TL866-II Plus programmer - change device pinout? - Page 1
Forum section: electronics / projects

author: Circlotron
author_rank: Super Contributor
timestamp: April 27, 2020, 01:17:46 pm
content: Here's the situation - we have old design board that uses a 1Mx8 EPROM and we want to replace it with a more modern 5V flash device. On-board programming is not an option at this stage. Would enormously complicate things and set us back a long time. The current path of attack is to draw up a small board with the flash mem on it and plug it straight into the EPROM socket. So far so good. If we want to use the programmer on this small board though, the flash device pinout that the programmer socket would present doesn't match the original EPROM pinout that the small board would have so we can't just plug the small board straight into the programmer. Is there some way, or is there someone here skilled enough to devise a way to make this happen?

author: coromonadalix
author_rank: Super Contributor
timestamp: April 27, 2020, 01:22:26 pm
content: Maybe an home made socket adapter to convert your design, a 48 pins to another 48 pins with your right pinouts ?

author: bson
author_rank: Unknown
timestamp: April 27, 2020, 06:55:40 pm
content: Make an adapter board with a ZIF socket, that will hold your SMT NOR/FRAM/EEPROM carrier board during programming?

author: luiHS
author_rank: Frequent Contributor
timestamp: April 27, 2020, 08:11:54 pm
content: You didn't say what package your Flash memory is. I have a similar case replacing a PLCC32 Eprom by a Flash TSOP32. I program both memory chips with a TL866 programmer, for the Flash memory I have order this TSOP32 to DIP adapter to program it before solder it in my board.Or you can make another adapter PCB (DIP to DIP) just to program the flash if it is already soldered on your adapter board (I suppose TSOP to DIP).

author: Circlotron
author_rank: Super Contributor
timestamp: May 12, 2020, 03:20:24 am
content: The package is TSOP48.That adapter, is the pinout 1:1 from DIP to TSOP?The TSOP48 has a few extra connections and the original eprom uses all 32 DIP pins so it looks like I'll need a small plug in cable from the flash board to the adapter board that goes into the programmer.
TL866II+ flashing in circuit - Page 1
Forum section: electronics / projects

author: blazini36
author_rank: Regular Contributor
timestamp: July 24, 2024, 07:15:00 pm
content: I've been flashing the BIOS chip on a Steam Deck, trying out some changes and I have not been able to successfully flash this chip with the clip in circuit at all. Every time I have had to desolder the chip and place it in an adapter. The chip is aWinbond W25Q128JW if it matters.I saw an old thread some days ago where people were discussing this programmer and saying that you can get by overcurrent protection by bridging C22. I tried that on one of my TL866II+'s and it didn't help. I have 2 of these things. I never get a an overcurrent error in the Xgpro software, or the minipro Linux software, it just fails. In Xgpro there is a dropdown to select the vcc current but it's greyed out on mine, I guess my programmers don't support current selection?Everybody I spoke to says they can flash this chip with the clip using a CH341A programmer with a 1.8v adapter. I may just buy one of those but I already have way too much crap laying around that I use twice a year. Anyone have any success with this programmer in circuit? It's been good for pretty much everything else I do so I'd rather just make it work if possible.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 24, 2024, 09:18:13 pm
content: sometimes it is possible if you maintain the cpu in constant reset and use pomona clips, or good brands ...but you need to check if the write is possible IE: pcb pins are not grounded or pulled at vcc, it is better to unsolder it and put it into a dedicated socketfor soic ic's you have 2 possible width sizes

author: blazini36
author_rank: Regular Contributor
timestamp: July 25, 2024, 12:48:00 am
content: I've been desoldering and using an adapter but I have alot of tests to do and theres no space to rig up a socket on the PCB. Like I said, I know people get away with using those cheap CHA341 programmers with adapters and the same clip, so I know it can be done. Those CHA341A/1.8v setups are just so jank it's hard to bring myself to do it.
TLA715 Logic Analyzer question - Wish to chat with owners of this analyzer - Page 1
Forum section: electronics / projects

author: rfdes
author_rank: Regular Contributor
timestamp: January 24, 2023, 09:41:46 pm
content: If anyone has this analyzer, I would like to ask how you are able to modify the brightness of the internal LCD screen. Is this done through the control panel? Mine is outfitted with Win2000 and am not sure how this is done.Thanks
TLC2272 opamp stability at unity gain - Page 1
Forum section: electronics / projects

author: AussieBruce
author_rank: Regular Contributor
timestamp: May 02, 2022, 04:43:37 am
content: Hi, I'd like to use TLC2272s at unity gain (out direct to in-), but the datasheet doesn't specifically state stable at unity gain. It does have specs for phase margin (50 deg), and gain margin (10dB), which from my recollection of my decades ago control unit suggests that it may be OK. Am I likely to be on 'solid ground'?

author: Phoenix
author_rank: Frequent Contributor
timestamp: May 02, 2022, 05:40:34 am
content: Phase margin at unity gain = 50deg means that it's stable.https://www.ti.com/lit/ds/symlink/tlc2272.pdf?ts=1651391044769&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTLC2272%253Futm_source%253Dgoogle%2526utm_medium%253Dcpc%2526utm_campaign%253Dasc-null-null-GPN_EN-cpc-pf-google-kr%2526utm_content%253DTLC2272%2526ds_k%253DTLC2272%2526DCM%253Dyes%2526gclid%253DCj0KCQjw37iTBhCWARIsACBt1IxHcpRUj5DyV0Jd0cBUVEqcR__qdKlk_JnCrWU6M7vnil10cOl1j_saAtHQEALw_wcB%2526gclsrc%253Daw.dsThe pulse response figures in the datasheet also shows "Voltage-Follower" responses which is unity gain configuration.
TLC5940 Software library for stm32cube IDE - Page 1
Forum section: electronics / projects

author: Roeland
author_rank: Newbie
timestamp: January 29, 2021, 09:30:22 am
content: Hello,I’m a student from KU-Leuven university in Belgium and for a project I use 3 TLC5940's to drive a 16x16 RGB Led matrix. I want to use the STM32CUBE IDE to write the software.Now because my software skills are not the best I searched for an existing library. I found a library that works on the Mbed compiler (https://os.mbed.com/users/Spencer/code/TLC5940/) to use it in STM32CUBE IDE there are a lot of things that needs to be translated to work. Is there a easy way to translate or is there any chance this library exist for the stm32cube IDE?Kind regardsRoeland Osaer
TLC5940 variable current – will this work... - Page 1
Forum section: electronics / projects

author: 3dgeo
author_rank: Frequent Contributor
timestamp: January 06, 2019, 01:40:54 am
content: Hello,straight to the questions:1. Can I connect 3 TLC5940 IREFF pins together without diode like in picture below?2. Is there any potential issues that can occur while „shorting“ resistors to one of TLC pins to change max current? Goal is to reduce resistance to ground from 4K to 2K, this will change max current from ~10mA to ~20mA.Current limit will be set only on power on, this design is for a reason...TLC sets max current according to current flowing from IREF to ground, so I'm assuming my circuit should work, but I need to use 3 times lower resistors than usual due to triple current flow needed for all 3 TLCs, am I rights?Thanks

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 06, 2019, 10:30:20 am
content: No, they have to be independent. The IREF voltage is servoed to 1.24V and small variations between chips will cause one to carry all the current and the others to read ~zero.If you need to link them together, you need a current mirror, or voltage-to-current converters.Tim

author: David Hess
author_rank: Super Contributor
timestamp: January 06, 2019, 12:35:39 pm
content: A ballast series resistor on each Iref pin could be used in less demanding applications. This would work better if a reference voltage lower than ground was used.

author: 3dgeo
author_rank: Frequent Contributor
timestamp: January 06, 2019, 02:33:53 pm
content: I had a suspicion that small chip variations will cause problems, thank you.There is no need to link them, it's just there is no space on PCB to put extra resistors, tho looks like I have to find someIf I remove two TLCs from my picture and use 3rd chip output to cut its IREF resistance in half it should be ok? I'll just do same for all chips (I only using 15 outputs on each chip).

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 06, 2019, 02:42:20 pm
content: Yes, that's fineTim
TLC5940/5941 - default initialisation? - Page 1
Forum section: electronics / projects

author: tom66
author_rank: Super Contributor
timestamp: May 26, 2014, 07:51:02 pm
content: I'm trying to design a system using a TLC5940 or 5941. Ideally, I want to keep the amount of cabling down low. So, I would like to simplify the connections.I know I need XLAT, SCLK, SIN and an SOUT (chained to next IC.) GSCLK can be generated on my board using a fast RC oscillator.From reading the datasheet, it seems that BLANK can be always grounded, but it's not clear. XERR doesn't have to be used if I don't care about error feedback. TEST is always at VCC.The pin that has me most worried is the MODE pin. That's needed if I want control over the dot correction, but I'm not sure I'll need that. However, I might need it during initialisation - to program the initial dot correction values to 100%. What isn't made clear in the datasheet is if these registers initialise like that or if they initialise to random or undefined values.So my minimum pin out is:GNDSCLKSINXLAT(+MODE?)(Power for VCC is derived off the LED bus voltage, which is wired separately.)Can anyone confirm if this will work?

author: ajb
author_rank: Super Contributor
timestamp: May 27, 2014, 02:39:20 am
content: BLANK is required to reset the grayscale counter, so that one is not optional. You could derive it from GSCLK via a 12-bit divider (or a smaller divider if you don't need 12 bit resolution) if you're okay with not being able to update the grayscale registers synchronously (or adding some glue logic between BLANK and XLAT). Typically you'd assert XLAT while BLANK is active, but that's not too big a deal if you're not doing a multiplexed matrix or something else that requires frame-synchronous updates.MODE is also required--the contents of the GS and DC registers are not guaranteed at startup, so you'll need to set those during initialization as you suspect (see the caption under Figure 16 in the TLC59401 datasheet).MODE and XLAT can be common to a whole chain of ICs, if that helps, though you may need some buffering if you have a LOT of chips to control. If this is something where the TLC5940 is far away from the main MCU, you might be better off adding a little local MCU to handle GSCLK and BLANK generation with a simple serial link back to a main controller.
TLE 4201A by Siemens --obsolete, looking for source or equivalent  - Page 1
Forum section: electronics / projects

author: Tom18991
author_rank: Contributor
timestamp: December 02, 2020, 03:28:34 am
content: I'm trying to bring an old motor controller board back to life and it uses several of these chips, some of which I believe are bad. Anyone have leads on where I can find these and/or know of any equivalent chips I could use in an existing circuit designed for the TLE 4201A?

author: EverydayMuffin
author_rank: Regular Contributor
timestamp: December 02, 2020, 10:04:05 am
content: Do you have a datasheet? What package?Siemens Semiconductor became Infineon, would these parts work?https://www.infineon.com/cms/en/product/power/motor-control-ics/servo-and-stepper-motor-driver/tle4206-2g/https://www.infineon.com/cms/en/product/power/motor-control-ics/brushed-dc-motor-driver-ics/integrated-full-bridge-driver/tle5205-2g/Also have a look athttps://www.rocelec.com/search?q=TLE420for some older parts?
TLE2426 alternative - Page 1
Forum section: electronics / projects

author: Obin
author_rank: Contributor
timestamp: July 23, 2015, 06:02:30 pm
content: Hi everybody,I have been using the TLE2426 in most of my projects since its a fairly handy component. (railsplitter in TO-92 housing) but my stock is running low and I was wondering if there maybe were other railsplitters that are a decent alternative (read: cheaper and also do their job)For the moment my projects are small, so handling huge currents is not something i demand from the component. I tried to find an alternative but I can't find any! I can't imagine Texas Instruments being the only company making railsplitters?(and as a bonus question: Just how does one find alternatives to chips? Does somebody know a like a "synonym.com" for electric components?)Cheerios

author: fivefish
author_rank: Frequent Contributor
timestamp: July 23, 2015, 07:51:58 pm
content: There's approx 5,000 pcs of TO-92 TLE2426 available at Mouser.com

author: edavid
author_rank: Super Contributor
timestamp: July 23, 2015, 08:01:08 pm
content: I don't think there is an alternative, which is why the price is so high. Most designs seem to use a resistive divider, either plain or buffered with an op amp.
TLE4267 voltage reg. control - Page 1
Forum section: electronics / projects

author: EMIRGIN
author_rank: Newbie
timestamp: January 20, 2022, 08:14:06 am
content: I will use TLE4267 reg.Please help me fo MCU and tle4267 connection.How should I connect the "hold" "inhibit" and "RO" pins to the MCU?Can I connect the "inhibit" and "RO" pins directly to the source? Or should I give 1 or 0 directly from the processor?Please help me.Thanks..
TLE4997 linear hall sensor source code - Page 1
Forum section: electronics / projects

author: cmcraeslo
author_rank: Regular Contributor
timestamp: December 07, 2017, 07:57:42 am
content: Hey guys.I'm using TLE4997 in one of my projects and I only get voltages from 2-3V. I want to get full 0-5V scale and it looks like I will need to program it (https://www.infineon.com/dgdl/Infineon-TLE4997-UM-v01_00-EN.pdf?fileId=5546d4625d5945ed015d9e2be09550ff). Does anyone know if there's some source code available for this? The protocol is not that hard, but i'd rather avoid reinventing the wheel if possible.Thanks!
TLV1811 comparator setting into push pull mode - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: October 06, 2024, 08:50:20 am
content: Hello,I have the following TLV1811 component which is used as comparator.In the datasheet on the headline they say it could be push pull or open drain output.If the TLV1811 will be set as open drain then ill have to put pullup resistors.How can I know that my TLV1811 is pushpull?Thanks.https://www.mouser.com/ProductDetail/Texas-Instruments/TLV1811LDBVR?qs=rQFj71Wb1eX09MzTfpxERg==https://www.ti.com/lit/ds/symlink/t...=https%3A%2F%2Fwww.ti.com%2Fproduct%2FTLV1811

author: RandomUser
author_rank: Contributor
timestamp: October 06, 2024, 09:07:46 am
content: Hi John,the Trick is to read more then the title of the datadheet. On First Page it says TLV182x open-drain and TLV181x push pull, where x is the Number of channels.Have a great day
TLV61225 boost - Short-circuit when powered from a CR2032 coin-cell battery - Page 1
Forum section: electronics / projects

author: MrZeroo00
author_rank: Contributor
timestamp: January 02, 2017, 02:15:39 pm
content: Hello,I am powering my board using aTLV61225boost IC with a CR2032 coin-cell battery (nominal voltage 3V when fully charged) to output 3.3VThe circuit draws about 20 mA under load (only 2 LEDs are powered up at a time). According to fig 1 of thedatasheet, the boost should be able to source at least 160 mAWhen powered from a coin-cell, the circuit draws the maximum amount of current the battery can provide and discharges it in seconds. Seems like a weird mode where the boost is short-circuiting the output (or the input?).When powered from a bench power supply with a fairly high current limit (~ 200 mA) the circuit works perfectly and the regulation looks OK (at light load and under load). However lowering the current limit of the bench supply to around ~ 100 mA recreates the behavior of the coin-cell: short-circuit, the boost draws the maximum amount of current.Here's my schematic (R11 is not loaded):What could explain this behavior and how to fix it?Thanks for your help!

author: bktemp
author_rank: Super Contributor
timestamp: January 02, 2017, 02:25:14 pm
content: Quote from: MrZeroo00 on January 02, 2017, 02:15:39 pmDatasheet page 7:QuoteSo the controller turns the switch on until it senses 200mA, then turns it off again. If your power supply can't supply 200mA, the switch will stay on indefinitely.Workaround:The best one is probably use a different ic, that uses a limited turn on time. Maybe something like MCP1640.If you add a large enough capacitor to the input and delay ENABLE for the ic, the capacitor will have enough energy stored to supply the 200mA for the ic to operate correctly.

author: matseng
author_rank: Frequent Contributor
timestamp: January 02, 2017, 02:32:29 pm
content: Do you *really* need to boost the nominal 3 volts to 3.3? The '430 works down to 1.8 volts and the NFC chip is happy at 2.4.

author: Codemonkey
author_rank: Regular Contributor
timestamp: January 02, 2017, 02:33:38 pm
content: Coin cells have a very high internal resistance. You'll only be able to draw a few milliamps reliably from a CR2032 before the voltage drops significantly. Certainly anything over about 20mA is really pushing it!

author: Fungus
author_rank: Super Contributor
timestamp: January 02, 2017, 03:51:46 pm
content: Quote from: MrZeroo00 on January 02, 2017, 02:15:39 pmThat's still quite a lot for a CR2032, you'll get quite a voltage drop due to battery ESR.Quote from: MrZeroo00 on January 02, 2017, 02:15:39 pmThe booster draws current, the voltage drops.The booster tries to draw more current to compensate, the voltage drops even more.Repeat...

author: Fungus
author_rank: Super Contributor
timestamp: January 02, 2017, 04:57:21 pm
content: Quote from: matseng on January 02, 2017, 02:32:29 pmYep, just take the booster out and run the LEDs with 3V.
Tm1640 not working? - Page 1
Forum section: electronics / projects

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: November 03, 2023, 10:54:56 pm
content: I dont know if my communication protocol is right but, turning display on and off by command is working. What does not work is setting registers for segments that i want to turn on.After power on it display some UFO CODE which is same after every reset.I have checked random connections on pcb and it seems ok.I hook up oscilloscope and decoded packets manually. They fit code i have written.So pseudocode isStart packetSend(0x44) /fixx adress modeEnd packetStart packetSend(0xc0) / adress 0hSend(0x61) / number 2End packetStart packetSend(0x89) / pwm 2/14 dtcEnd packetThis should set dispaly on fixx adress mode on grid 1, display pwm with 2/14 duty cycle, and display number 2 (if i remember correctly) on grid 1...Is this pseudocode ok? Thanks

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: November 04, 2023, 07:52:57 am
content: adding test codejas = brightness, packet_size = 8
TM404ABA (TM404A?) 40x4 Dot Matrix LCD Module - Page 1
Forum section: electronics / projects

author: stevetob67
author_rank: Contributor
timestamp: July 16, 2020, 11:28:48 am
content: Hello,I am looking for some help please, I have seen some messages regarding a HD### model of these 40x4 LCD modules but there is a difference with the number of pins on the opposing end as the 2x8 pin rows. I was hoping someone has seen these modules around, I have got my hands on three of these, for some reason a couple of eBay sellers are selling the HD### models for around $40 AUD or so but these TM404ABA1 (TM404) versions are heading up around the $200 AUD price point. I don't for a minute believe they are this expensive but I picked them up in a grab bag from someone clearing some of their excess stock.I am looking to find a library that might work with Arduino as well as a pin description if anyone is able to help please, and help would be greatly appreciated however small. Hopefully the pictures are viewable and helpful.https://drive.google.com/file/d/1mf54eNUThIGFOZvv5O9Fq8H5ZFX2qxCQ/view?usp=sharinghttps://drive.google.com/file/d/1mrNVR_F6tUdTp20uU5x6WhwCyc-CnsOB/view?usp=sharing

author: N9XYP
author_rank: Contributor
timestamp: March 26, 2022, 06:28:14 pm
content: if you are still looking 2 years later, or for those that end up here from Google,The library is call LiquidCrystal440. Finding it without the name is rather difficult. I was written by Donald Weiman (floresta on some forums) back in 2009 or so. It basically was a mod of the standard LCD libray to account for the two 2x20 LCD. He had a site with some good information on the HD44780 displays. It is in archive heaven now -https://web.archive.org/web/20161104194254/http://web.alfredstate.edu/weimandnMikeEDIT: just make sure of the 2 row connector. There are three version that I know of, two are sort of inverse of each other.
TMC Stepper motor axis with only one reference switch - Page 1
Forum section: electronics / projects

author: Puffie40
author_rank: Regular Contributor
timestamp: March 20, 2024, 04:04:58 pm
content: Hi,I'm trying to implement a TMC5160 as a stepper motor controller for the tilt on a PTZ security camera. The tilt is configured so there is only one limit switch, located at the bottom of travel. We are talking to the controller over a RS485 line, so the code I am using is directly writing to the registries using Python.The code I am using has two distinct modes of travel - "Absolute", in which the controller has an exact pan or tilt distance to travel, and "Relative", in which the axis will move at a variable speed and distance as directed by a joystick. Setting up the limits in absolute mode is no problem - it can be set mathematically using the number of steps that the drive has, and the controller can filter that input before sending the command to the TMC.The biggest challenge I am struggling with is the fact I have no upper reference switch for the upper part of the travel. The motor will stall when the axis hits the hard stop, and then I loose my zero on the tilt axis. I messed around with stallguard, and found a speed where it can activate successfully, but that is where I reach a roadblock - There does not seem to be any way to set this limit in the TMC5160 registers, and stallguard appears to be rather unreliable with a variable speed system to actually implement.Is there a way to set up an automatic position stop using one of the position registers like XACTUAL or XLATCH? I'm going to investigate on the software side to see if I can implement a stop on that side

author: langwadt
author_rank: Super Contributor
timestamp: March 20, 2024, 04:55:52 pm
content: you are sending the commands to the controller, why would you command it to go past the known end?
TMCM1290 EVAL phototransistor question - Page 1
Forum section: electronics / projects

author: space
author_rank: Newbie
timestamp: October 03, 2025, 11:59:33 am
content: Hello,I’m using a TMCM-1290 evaluation board with a stepper motor and a phototransistor (GP1S093HCZ0F) for homing purposes. The board is connected via RS485 to USB.The motor works perfectly, but I’m having trouble getting the sensor to interact with the motor. The sensor detects light at a single position, which should serve as the home position. Currently, the sensor itself works, but the motor does not respond when the sensor is activated.The phototransistor is connected to the REF. SWITCHES input. I connected the cathode and emitter to GND, placed a resistor between the supply and the anode, and left the REF input connected to the collector. The board has a 4.7 kΩ pull-up resistor for the left REF input.I tested by manually shorting LEFT REF to GND, which successfully triggered a logic low and caused the motor to respond to the TMCL code. However, this does not happen with the phototransistor connected.Using a voltmeter, I measured 0.8 V between GND and the collector when light is detected, which the driver interprets as low, and 5 V when the light is off.Any suggestions?

author: jwet
author_rank: Frequent Contributor
timestamp: October 03, 2025, 06:02:51 pm
content: Look at how your ground current is flowing and where you are grounding the sensor's ground. If it has appreciable ground current flowing in it, it could get elevated and the part won't see your .8v as a valid low. A valid low is anything below 1v.Also, the phototransistor is getting turned on but not very hard. The collector voltage should saturate down below a quarter of a volt or so. Decrease the resistor supplying current to the anode of the LED in your sensor to turn it on harder- don't exceed 20 mA or so. You're getting .8v , this is close to 1v and with ground shifts could get corrupted.Good Luck
TMDS interface design/hack - Page 1
Forum section: electronics / projects

author: gnif
author_rank: Unknown
timestamp: October 02, 2013, 04:25:19 am
content: Hi All,I recently came into posession of a stack of 19" LCD monitors that are in perfect condition, except they only have a VGA input on them. I want to set three of them up on my daughters computer, which only has DVI outputs, only one of which has analogue out. I have stripped one of the monitors down and found that the IC supports a DVI input, and identified the pins, but it is not wired up.Comparing to the DVI input on another monitor, it has what looks like a FET on the DVI input and then is decoupled via a cap before entering the chip, what exactly is this doing? I understand the decoupling cap, but not the FET.Also, I understand that the firmware may prevent it even using the input, but I have nothing to loose but some time giving this a go.Edit: Here is another board using the same chip that I have used to identify the DVI pins:http://remont-aud.net/_bd/35/67957818.jpg, obviously this one is unpopulated. Mine does not even have the unpopulated circuit.

author: Stonent
author_rank: Super Contributor
timestamp: October 02, 2013, 04:34:31 am
content: Perhaps the FET is being used to allow for a different signaling current? So whatever the PC is outputting is not what the chip wants so the FET is being used to allow a different current through that's more to the chip's liking. Just a guess, I may be wrong.

author: marshallh
author_rank: Unknown
timestamp: October 02, 2013, 04:58:48 am
content: Probably ESD clamp diodes.. DVI input enable is probably set via pin strapping high/low or maybe setting in i2c/spi flash or eeprom.

author: gnif
author_rank: Unknown
timestamp: October 02, 2013, 05:43:42 am
content: Quote from: marshallh on October 02, 2013, 04:58:48 amI think they might be actually now you mention it since I have seen some LCD interface boards that have the DVI input but leave these pads unpopulated. As for enable, yes, I hope it is something as simple as a strap, otherwise I will have to dump the eeprom and see what I can find.
TMS3450 Digital clock on 12VDC? - Page 1
Forum section: electronics / projects

author: Jeannovy
author_rank: Newbie
timestamp: January 11, 2017, 08:40:43 pm
content: Can I use a NE555 to run a TMS3450 (http://pdf1.alldatasheet.com/datasheet-pdf/view/86980/TI/TMS3450NL.html) or is there a circuit to give the chip 50Hz and the display CYCLE1 and CYCLE2 that it requires so that I can run it from 12 to 15 Volt DC in 24 hour mode?

author: Paul Price
author_rank: Super Contributor
timestamp: January 13, 2017, 02:21:01 am
content: No.

author: Alex Nikitin
author_rank: Super Contributor
timestamp: January 13, 2017, 09:24:02 am
content: Yes.

author: Zero999
author_rank: Super Contributor
timestamp: January 13, 2017, 09:32:06 am
content: I think more than a yes/no answer is required here because both are right.Yes: it a 555 time could be used to generate the 50Hz clock.No, bad idea though, as the 555 timer doesn't have sufficient accuracy and stability to give good time keeping. It will continuously run too fast or too slow.Use a crystal oscillator and divider to generate 50Hz.
TNY278 does not power ON - Page 1
Forum section: electronics / projects

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: February 28, 2022, 02:59:09 pm
content: Between pin 2 and pins 5-8 i can measure only 1,2V but there should be 5,8V at least.I have made two boards, one prototype and one final product. Prototype is fully working, but final product sometimes works and sometimes not. I dont understant why.

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: February 28, 2022, 04:49:52 pm
content: I have added aditional power from auxilary winding. It powers on, stabilise voltage on secondary, but keeps pulsing with few Hz. That means there are 20V spikes every second.
to-39 heat sink thermal resistance - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: October 28, 2024, 09:42:26 pm
content: my HP unit had to-39 heat sinks in it, they are kind of like a springy stamping that you put over the transistor.I assume it has poor performance as a heat sink.I also have some of those old style To-18 aluminum heatsinks with the diode slot on them (the one where you can fit a through hole 'compensator') that are more difficult to put on but are basically extruded aluminum and fairly solid.Does any body know what the c/w might be for those two heat sink types?The 'better' one looks kinda like this onehttps://www.marcospecialties.com/pinball-parts/HS-TO39the 'flimsy' one looks like this kind ofhttps://elektronik-lavpris.dk/p115570/62530321-28-heatsink-for-to-39-284mm/Does anyone know if that extruded one is significantly better?its almost not worth the bother but I thought someone might have this information in their headand it does need something, because I can start to smell the unit when I forgot to put the heat sink back on.

author: bostonman
author_rank: Super Contributor
timestamp: October 29, 2024, 03:27:57 am
content: This may not be much help, and I'm sure you already thought of this, but seems the larger one has more surface area and would dissipate heat better.

author: David Hess
author_rank: Super Contributor
timestamp: October 29, 2024, 04:47:12 am
content: TO-39 parts are good for about 1 watt without a heat sink with a junction-to-ambient thermal resistance of 175C/W, so it does not take much of a heat sink to considerably improve the performance. It would help to add thermal grease, especially on the extruded aluminum heat sink.

author: coppercone2
author_rank: Super Contributor
timestamp: October 29, 2024, 05:06:55 am
content: You know actually it looks like that stamped heat sink has quite a bit of surface area, I was thinking maybe it might be close to the performance of the other one.Just the problem is that when you put that one on, its pretty tight, you want to leave it on, it does not remove easy like the stamping.. it has the potential to start tearing leads if I do experimentsmaybe I should do a junk box experiment to see if I have a dummy to39 device to heat upits actually not super obvious to me which one has higher thermal performance. I feel like it might just go either way lolthe biggest thing, I think one of em is made from... spring something, and the other is aluminum. No matter how fancy you can make a springy heat sink in terms of dissipators.. i wonder if its spring copper or magnetic. if its magnetic i am putting my money on the aluminum.and it turns out the springy one is non magnetic.What the hell is it made out of? its silver under neath. Spring aluminum? I thought it would be too likely to crack. what metal could that be?I am just gonna use themral greased extruded aluminum heatsinks instead of the mystery spring sheet heat sinks unless someone offers critical information within 2 weeks when the boxes are gonna be reassembled and tested
TO-220 Style LED - Page 1
Forum section: electronics / projects

author: madmaxbryan
author_rank: Contributor
timestamp: September 22, 2017, 10:48:30 pm
content: Found this odd white LED chip at the local electronics surplus store. I've never seen an LED in a TO-220 style package. I was told it was 15v 100mA, I can only get about 12.5v 100mA and it gets real hot real quick. It has a large copper heatsink running from the LED dies to the backside of the package. It doesn't seem to put out anymore light then a standard 3mm LED or SMD LED. Anyone know what purpose it might serve? There are a lot of high tech industries in the area so it might be a specific wavelength or something.

author: bjcuizon
author_rank: Frequent Contributor
timestamp: September 22, 2017, 11:13:28 pm
content: Might be for some automotive purpose as it has some spade type lugs/terminals

author: schmitt trigger
author_rank: Super Contributor
timestamp: September 22, 2017, 11:58:02 pm
content: That is what I was thinking also...an automotive application.It also appears that the device must be attached to a heat-sink

author: madmaxbryan
author_rank: Contributor
timestamp: September 23, 2017, 12:14:32 am
content: Yes it definitely needs a heatsink, it gets pretty hot at 12.5v. The spade lugs do scream automotive, I just cant think of any application that would use an LED with this style package over SMD or a tradition style automotive bulb. They're kind of neat, i might pick up a few more next time im at the surplus.

author: mariush
author_rank: Super Contributor
timestamp: September 23, 2017, 12:18:56 am
content: Could be for blinkers, to signal left and right on cars. Would not overheat that much if the pulse lengths are small.

author: djQUAN
author_rank: Frequent Contributor
timestamp: September 23, 2017, 01:14:33 am
content: Should be more. I recall Philips made a similar looking led for car headlights, you could look in their catalogs of anything similar. I would like to get my hands on one of those to play with too

author: madmaxbryan
author_rank: Contributor
timestamp: September 23, 2017, 01:37:01 am
content: Well after doing some digging around based on what everyone here has said suggested i think i found a close match. It looks like a Luxeon Altilon LED headlight, seems like they are meant to take 1000mA and not 100mA, might have to put this on a heatsink and crank it up to see how it looks.

author: bjcuizon
author_rank: Frequent Contributor
timestamp: September 23, 2017, 02:50:01 am
content: Quote from: madmaxbryan on September 23, 2017, 01:37:01 amOoh,...so that's why your getting a little amount of light like the 3mm ones emit.
TO-247 Isolation Jacket?? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: October 25, 2020, 11:46:04 pm
content: Hi,I have a MOSFET in a TO-247 package that, due to volume constraints, is bent 90 degrees down onto the PCB. I can only bend it in the direction where the thermal pad (which is also the MOSFET drain) is above the pins of other PTH components from the opposite side of the PCB. Because the pad has a 275Vac it needs to be raised above the board of at least 3.5mm. But there is not enough space inside the tight enclosure.Two questions:1) are there any TO-247 insolation jackets for this purpose? i.e. that I can slide over the entire TO-247 or at least at the back to electrically isolate AND/OR provide and guarantee the required gap?2) I have been looking at various TO-247 MOSFETS without a conductive/connected thermal pad but couldn't find any in the datasheets I looked at. Is there a way to find such MOSFETs without a conductive thermal pad? If so how?The MOSFET I am using is 550V 13-15A...:http://www.farnell.com/datasheets/2148558.pdfThank you

author: jbb
author_rank: Super Contributor
timestamp: October 26, 2020, 12:09:39 am
content: Err, I don’t know part numbers, but you can get silicone socks. These would fall under thermal management / heat sink pads in the catalogs.You’d probably need to fasten it somehow. I would suggest that your TO-247 needs to be mechanically fastened down anyway so it doesn’t shake about. Solder joints will fatigue and crack if you have a mass (TO-247 body) and spring (legs) attached. I think you can find compression clips, which just squeeze down on the outside of the sock, for this.You know, this sounds aggravating. Are you sure you can’t find a surface mount solution?

author: ricko_uk
author_rank: Super Contributor
timestamp: October 26, 2020, 12:35:56 am
content: Thank you jbb !it would be ideal, but cannot find a 500V 13-15A SMD. I think it has to do with thermal dissipation.

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: October 26, 2020, 05:58:40 am
content: I have seen such sleeves for TO-220 devices, likethese, they may not be wide enough for a TO-247.DK lists 308 SMD MOSFETs with >= 500V Vds and >= 13A Idd. For example, theSTB45N65M5, which is also available in TO-220, with an isolated body. There's also the much cheaperIPD60R180P7SAUMA1.

author: jonpaul
author_rank: Super Contributor
timestamp: October 26, 2020, 09:03:51 am
content: Helpful to have a photo of the heatsink, PCB and transistor to understand what you need.Jon

author: mag_therm
author_rank: Frequent Contributor
timestamp: October 26, 2020, 05:26:30 pm
content: Does that have a creepage (surface tracking) requirement as well?IEC-60950-1 etc
TO-247 thermal - Page 1
Forum section: electronics / projects

author: strawberry
author_rank: Super Contributor
timestamp: April 01, 2021, 06:40:53 pm
content: How to cool down high power 5s pulsesAlO ceramic?heatsink anodising coating is bad thermal conductor?

author: ajb
author_rank: Super Contributor
timestamp: April 01, 2021, 08:17:36 pm
content: 5s is plenty of time for heat from the device to flow into an attached heatsink. Depending on duty cycle, a relatively large chunk of aluminum to provide some thermal mass may be just as effective as a proper heatsink. Beyond that it really depends on the power levels and duty cycle in question.The layer of aluminum oxide created by anodizing aluminum is a worse thermal conductor than metallic aluminum (something like 15-50 W/mK versus 200 W/mK), but the oxide is typically only 2-25um thick (anything over ~25um is considered "hard" anodizing). The oxide and the increased surface area that anodizing produces also provide much higher surface emissivity, around 0.83 versus 0.05 for bare aluminum. Increased emissivity means the heatsink is much more effective at radiating heat into the environment. How much this matters compared to conducting heat into the surrounding air depends on airflow conditions and other environmental factors (like is it closed in a box?). But generally anodizing does not make for a worse heatsink, and may make for a substantially better one, especially given the increased surface area. AIUI, color of the anodizing has little or no appreciable effect relative to the other factors.https://www.qats.com/cms/2010/11/09/how-heat-sink-anondization-improves-thermal-performance-part-1-of-2/

author: strawberry
author_rank: Super Contributor
timestamp: April 01, 2021, 09:09:53 pm
content: 2.4kW peak for 5..10s (~40W loss per MOSFET) MOSFET plastic case gets noticeably hot (~80C) silicon die could be even hotterduty cycle 50, freq 100kisolator 2mm AlO ceramic wafer50x75x20 heatsink fan cooled

author: David Hess
author_rank: Super Contributor
timestamp: April 02, 2021, 12:01:10 am
content: Quote from: ajb on April 01, 2021, 08:17:36 pmThermal radiation is proportional to the 4th power of the temperature so even with ideal conditions, high temperature, and natural convection, it amounts to less then 1/3rd of the dissipated power. A small amount of forced convection reduces the contribution from thermal radiation to insignificant levels.
TO-263S heat dissipation - Page 1
Forum section: electronics / projects

author: reyntjensm
author_rank: Regular Contributor
timestamp: November 26, 2020, 04:53:34 pm
content: I have a project with two mosfets(https://fscdn.rohm.com/en/products/databook/datasheet/discrete/transistor/mosfet/r6020pnjfratl-e.pdf) in a TO-263S package close to each other. According to LTspice the mosfet's would dissipate 40W. How can i get the heat out of such package? I can't find any heatsink for such a package who is able to dissipate 20W. Should this be done via a very large copper pour? Max PD in datasheet is 305W, how can they ever get the heat out of such a package?

author: wraper
author_rank: Unknown
timestamp: November 26, 2020, 05:04:49 pm
content: QuoteForget about it. It's cheaper and way easier to use more MOSFETs.QuoteThey don't (under reasonable conditions). If you want to dissipate even 20W from single MOSFET, you will need to use a through hole part mounted on a heatsink.

author: TimFox
author_rank: Super Contributor
timestamp: November 26, 2020, 05:18:23 pm
content: This is a common (and commonly misunderstood) way to specify thermal power limits on power semiconductors.There are two important lines:Maximum junction temperature Tj= 150 CMaximum power at Tcase= 25 C, 304 W.Those two terms determine the relevant parameter of thermal resistance from junction to case:RT jc= (150 - 25) K / (304 W) = 0.411 K/WThis thermal resistance is in series with the interface resistance between case and heatsink, and the resistance between heatsink and ambient air. That external resistance is generally much larger than the internal resistance.I find the “304 W” value suspicious, since it may not be determined to 1% accuracy.Note the spec of 80 K/W for total thermal resistance when mounted on 25 x 27 x 0.8 mm FR4 pub (note 5). Mounted thusly in 25 C air limits the power to (125 K)/(80 K/W) = 1.56 W.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: November 26, 2020, 05:55:41 pm
content: You can probably dissipate 20W from a TO263 if you solder it directly to a PCB with aluminimum substrate. I don't know the name of that, but it's commonly used for LED panels with COB.Another option is to make a big hole in the PCB and then solder in a spacial stud for mounting a heatsink on, but that is also a pretty specialized solution.The most common solution to satisfy a need to dissipate 20Watt would be to use another package such as TO220.A more modern way would be to use a solution to avoid having to waste 20W as heat.

author: Siwastaja
author_rank: Super Contributor
timestamp: November 26, 2020, 06:00:35 pm
content: Today, silicon is cheap, aluminium is expensive.This means, buy more semiconductors. If nothing else, Rth_junction-to-case parallel, making heatsinking much easier, meaning you can run the heatsink at higher temperature while maintaining low enough Tj.
TO-3 footprint - Page 1
Forum section: electronics / projects

author: geggi1
author_rank: Frequent Contributor
timestamp: April 03, 2024, 03:07:46 pm
content: Can anybody provide me with a footprint / drill pattern of a TO-3 transistor (2N3055) for Autocad DWG or DFX.I'm revers engineering a linear PSU to fit in a different case than original.

author: Terry Bites
author_rank: Super Contributor
timestamp: April 03, 2024, 03:57:20 pm
content: 3055 datasheet?

author: MarkF
author_rank: Super Contributor
timestamp: April 03, 2024, 05:12:54 pm
content: Downloaded fromGrabCAD

author: geggi1
author_rank: Frequent Contributor
timestamp: April 04, 2024, 11:07:20 am
content: Thank you for the help.