hybridfree/eevblog-posts huggingface dataset:
Thumbnail fan controller - Page 1
Forum section: electronics / projects

author: ElectronSurf
author_rank: Regular Contributor
timestamp: March 29, 2023, 11:43:09 am
content: I needed to add fan control capability for my100W electronic load, It has to be small and easy to plug it in where the fan supply socket is.So I came up with this design and thought I share with you, it's a simple and useful circuit to have.I suggest to use a voltage reference to set the threshold voltage and also a flyback diode is needed, I think with a SMD MOSFET it can be even smaller than 25x18 mm.Link to the simulator.- Don't judge my soldering, I was debugging this board!

author: mariush
author_rank: Super Contributor
timestamp: March 29, 2023, 12:10:33 pm
content: Or you could get a fan with PWM feature and a 6-8 pin micro can use ADC to read the resistor and adjust the pwm signal as needed.Maybe even a 555 could be repurposed instead of a micro.

author: shapirus
author_rank: Super Contributor
timestamp: March 29, 2023, 12:21:11 pm
content: What's the purpose of the upper op amp?

author: ElectronSurf
author_rank: Regular Contributor
timestamp: March 29, 2023, 02:49:18 pm
content: Quote from: shapirus on March 29, 2023, 12:21:11 pmTurning off the fan at a set temperature.
Thumbwheel potentiomer with switch - Page 1
Forum section: electronics / projects

author: Rachie5272
author_rank: Regular Contributor
timestamp: July 03, 2021, 03:56:43 pm
content: I'm designing a compact audio device, and I'm trying to find a source of small thumbwheel potentiometers with built-in switches. I remember seeing them on all kinds of portable radios and tape players, but I can't find any on Digikey, Mouser, or LCSC. Does anyone know where to look? 10k linear taper is fine.
Thunderbolt 3 to Fiber Media Converter - Page 1
Forum section: electronics / projects

author: coco3431
author_rank: Newbie
timestamp: August 10, 2022, 03:44:18 pm
content: Hello All!Lately I've been wishing I could run Thunderbolt over fiber in my apartment but the only option I've found is from Corning, which while not bad isn't exactly what I'm looking for. I have an QSFP+ 40Gbps fiber cable with transceivers sitting around collecting dust and started looking into if anyone was making media converters, similar to ones that exist for HDMI to SFP+ and back. Unable to find any I started to research how I could build such a device, but have some concerns. I'd appreciate some pointers/advice just to make sure I'm on the right track. It seems like I can just send differential signals into a transceiver and as long as they're both powered it will get spit out on the other transceiver. This sounds almost too easy and I can't help but think I'll need some kind of redriver chip after exiting the transceiver. But maybe that would mess up latency/timing of the signal? I'm not too worried about the actual high-speed routing, I've had success with PCIe3.0 and USB3.0, more just trying to figure out what is all required for this type of conversion to be successful. I'm also aware that there's extra non-differential pair communications (SBU1/2, USB2, and CC Pins) but I'm less worried about those as they're much slower in comparison and I could send them over a separate bus/cable.TLDR Question: Can I just connect Thunderbolt 3 differential pairs to an QSFP+ transceiver or is there more complication to do so?Thanks!

author: Hydron
author_rank: Super Contributor
timestamp: August 10, 2022, 07:38:35 pm
content: All I can say is that don't just assume that USB2 will be easy due to being "low speed" - I wouldn't be surprised if that is far harder to deal with than the Thunderbolt stuff.

author: Someone
author_rank: Super Contributor
timestamp: August 10, 2022, 10:07:36 pm
content: Quote from: coco3431 on August 10, 2022, 03:44:18 pmPossibly? The two transports you want to jam together do use the same symbol encoding, so it might just work.Cost of working all that through vs buying the ready made cable? I wouldn't be experimenting.
Thunderbolt 4 mux switch - Page 1
Forum section: electronics / projects

author: Haiku5743
author_rank: Newbie
timestamp: July 23, 2023, 02:50:03 pm
content: Hi there,I'm relatively new to electronics. I was wondering if it would be possible to just have a passive mux switch that would change the between TB4 laptops and a TB4 dock. From a technical standpoint TB4 cables have 24 pins. If you were to have two inputs (computers) so 24 pins x2, where the switch would output 1x 24pin the active input (currently selected). I'm guessing it wouldn't just be this easy as someone would've likely built it already, given that these sorts of KVM style switches could easy go for $300USD for TB4. Also the laptops are powered by the cable as well through USB-C PD which delivers around 100w to them through my Caldigit TS4 dock. As far as I know TB4 cables have a special chip inside the cable ends, not sure if its just one or two. Would like to hear someone's thoughts on this.Thanks!
Thunderbolt KVM - Page 1
Forum section: electronics / projects

author: elimenohpee
author_rank: Contributor
timestamp: February 17, 2021, 08:06:19 pm
content: I have a personal laptop and a work laptop (both HP) and will soon be getting a docking station from work to allow me to use dual monitors. Naturally, I'd like to use this setup for my personal laptop when I'm not working for convenience. I tried looking for thunderbolt KVM switches but I cannot seem to find anything out there that really does this. Maybe this is just an odd use case?The docking station connects to the laptop via a thunderbolt connection. Is there any reason you couldn't just create a little board with a single pole double throw type switch to route this connection to which ever laptop you wanted to use, or is there something else hidden in the technology that would prevent this? I'm definitely not an expert on thunderbolt. Seeing as docking stations are on the order of ~$200, I thought it might be a project someone else would be interested in as well.Thoughts?

author: Someone
author_rank: Super Contributor
timestamp: February 17, 2021, 09:27:30 pm
content: Thunderbolt in the context of a dock is usually carrying video to the monitors and a USB pipe for the docks I/O (less often a PCIe pipe too). Adding a switch is just like unplugging the dock and plugging it into the other computer. "better" KVM switches keep the disconnected computers attached to a set of dummy displays/peripherals so they don't complain about being disconnected/reconnected. This gets complicated when most docks are used as the network connection...2 docks and KVM the monitors/keyboard/mouse, thats what they are designed for.
Thunderbolt power connector crimping tool - Page 1
Forum section: electronics / projects

author: MattSR
author_rank: Regular Contributor
timestamp: June 08, 2015, 10:47:04 am
content: Hi Guys,I am currently in the process of completing my Thunderbolt project and I need to find a suitable crimper to attach wires to the pins that go inside the power connector.The only reference I can find is on this page here (http://www.prc68.com/I/ThunderBolt.shtml) that talks about the official Molex tool which is scarily expensive, and the page also mentioned a Radioshack tool that I can't find any further details on.Can someone please point me in the right direction of a suitable crimper for the Molex 538-16-02-0103 pins. Is this a generic crimping tool or something special?Thanks,Matt

author: amyk
author_rank: Super Contributor
timestamp: June 08, 2015, 01:02:55 pm
content: This one?

author: noidea
author_rank: Unknown
timestamp: June 08, 2015, 02:37:34 pm
content: Mi MattSR I see you are downunda like me!I wonder if they mean something like this?http://www.altronics.com.au/p/t1537-crimptool-telephone-terminal-20-28-awg/If you're over on the west side I can lend you a set to try

author: LabSpokane
author_rank: Super Contributor
timestamp: June 08, 2015, 02:55:04 pm
content: This just might work:http://www.ebay.com/itm/261186661125Quality is fantastic and makes perfect crimps.
Thyristor pre-reg for a Linear adjustable CV-reg - Page 1
Forum section: electronics / projects

author: Hr_Satch
author_rank: Contributor
timestamp: December 11, 2024, 10:15:27 pm
content: Hi, forum,just to ellaborate on an 'older' topic I recently discovered:a thyristor pre-reg, that limits the charging of a rectifier capas to limit the following CV-regulator's power heat dissip.-- --So it regulates the THY or SCR on the zero crossings of the ACV.But isn't it adviced to switch a transformers' primary on the Peak Amplitude ;-?Dixit Mr. Rod Elliot from Australia.-- --Seen a transformer's behaviour in the primary acts on the secondary;but it also goes up the other way ;-?-- --So wouldn't it be better to trig the SCR (in the secondary)also on the peak/amplitude of the sine voltage ?Just an idea, Harry.Moreover, istead of complicating me things: I'd rather rewind the secondary windingsto suit my purpose, to achieve minimum dissipation.ofcourse this goes more up for fixed voltages.I'd be pleased to see some older thread responders coming back up again, thanx.

author: David Hess
author_rank: Super Contributor
timestamp: December 12, 2024, 12:01:59 am
content: A thyristor pre-regulator implies some type of phase control and not just switching between transformer taps.

author: PCB.Wiz
author_rank: Super Contributor
timestamp: December 12, 2024, 12:14:50 am
content: Quote from: Hr_Satch on December 11, 2024, 10:15:27 pmHow many amps & watts are we talking?A bridge rectifier makes better use of transformer windings, so gives lower loss / more maximum power for a given transformer.SCR’S are simpler-older tech, but they do drop about 1V, so much more than a mosfet bridge.A modern design might choose a stky bridge and buck regulator, for lowest pcb heat budgets.

author: Benta
author_rank: Super Contributor
timestamp: December 12, 2024, 12:22:08 am
content: The design that David Hess shows is basically a 120 Hz, PWM controlled buck converter using SCR phase-angle control. Note the 1 mH inductor.PWM is controlled by the gate firing transformer and the feedback circuit.Very old school and not really relevant today IMO.

author: Konkedout
author_rank: Frequent Contributor
timestamp: December 12, 2024, 03:43:28 am
content: I agree that it is not very relevant.Many years ago I did design a medical grade battery charger which used SCR phase control regulation in the output circuitry. This output did not need to be filtered.But if you want to preregulate ahead of a linear regulator, I think it makes a lot more sense to use one of many buck switching regulators that are available. Those can be implemented with fewer parts and probably lower cost.
TI 83+ Overclock revisted - Page 1
Forum section: electronics / projects

author: tayexdrums
author_rank: Contributor
timestamp: June 27, 2013, 02:37:49 pm
content: Hi, I am wanting to overclock an old TI 83+. I while ago I asked about this on the forum but didn't get enough help to actually do the modification. Here is the link:https://www.eevblog.com/forum/projects/ti-83-overclock/msg56838/#msg56838To summarize, I have not been able to find a datasheet on the MPU that is used in this version of the calculator. I am stuck until I can find a datasheet or until I get brave enough to start probing around with the scope. My fear in doing that is that I could potentially short somethingThanks

author: Unknown
author_rank: Unknown
timestamp: June 27, 2013, 07:39:36 pm
content: Which MPU is it?
TI BQ24450 - Voltage on pins when supply voltage is 0/floating? - Page 1
Forum section: electronics / projects

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: November 01, 2018, 01:28:53 pm
content: I am looking at building a circuit using aTI BQ24450Lead-Acid battery charger controller. This is for an application where the simplicity and robustness of a sealed lead-acid is desirable. I am aware that the part is NRND, but this is a one-off build and I have a dozen or so spares.The goal is for this charger to go in the same large enclosure (flight-case) as the battery. The enclosure will then have a standard C14 connector on the front panel that can be used to plug the box in to charge it up. I'm still not 100% sure on how the voltage will go from mains AC to DC, but likely a simple transformer + bridge rectifier will be used.What I am now wondering about is whether or not it is ok for a voltage to be applied across some of the pins of the IC, when the power is disconnected. I would usually assume not (ESD protection and all that), but in this case I get the impression from some of the example schematics in the datasheet that it is ok. There is also nowhere it is explicitly stated itisn'tallowed (at least from what I could tell, but I am not that good at reading datasheets so I could have missed it).Anyone have any input on this? If I can just allow the charger to remain connected to the battery without power applied, this would mean I can get rid of yet another switch and user operation, which is very desirable. However, I don't want to risk it not being ok and me blowing up the few parts I have.
TI cc3000 wakeup/re-programming - Page 1
Forum section: electronics / projects

author: bobarnold
author_rank: Newbie
timestamp: November 24, 2013, 10:29:05 pm
content: I’d like to give the TI CC3000 Module – Wi-Fi 802.11b/g Network Processor (spec =http://www.ti.com/lit/ds/symlink/cc3000.pdf) a try.Questions I have after reading the spec are;I can’t tell whether the module can be re-programmed to wake itself up every second but if not, can I strobe the unit from an mcu to wake up every second using the VBAT_SW_EN (p 9).Can raising VBAT_SW_EN trigger “automatic fast connection to an access point without user or host intervention” using “user-configurable profiles stored in an NVMEM” and could also wake up some of the other devices which can be put to sleep at the same time (p 2)To what extent can I can reprogram the EEPROM via UART >> pins on the module? Reset communications parms? Replace communications stack (if yes could I compile a program, including comm stack, into a binary and download to the module through UART?THanksWhat avenue do you think I should investigate next?
TI CC3120/3220 VS ESP8266 - Page 1
Forum section: electronics / projects

author: jtronix
author_rank: Regular Contributor
timestamp: April 09, 2017, 06:21:38 am
content: Hello,I'm looking for WiFi solution for my IOT project where I need HTTP, MQTT, TCP and OTA feature.I'd seen some of the quite good solution with ESP8266 and also it is cheapest about 2$, But while going through development environment I found that many things are missing like bootloader source code, other device and application library code.Even it does't have any IDE, JTAG debugging support or good supported document (like Memory Mapping, Peripheral details...etc).Pros:1) Low cost2) Easily available in market with complete assembly with memorycons:1) Source code not available for all modules2) IDE, JTAG debug not supported3) Poor documentationTI CC3120 / CC3320:Pro:Good documentation, JTAG for debug and it has full SDK with source code.Cons:1) Cost is high compared to ESP82662) Not easily available in market3) Separate Memory required (Not sure).I'm bit confuse with above two device, can any one advice me to choose right device for my application.My main criteria is1) Easy to develop2) Can be flexible for upgrade protocol in C.3) Will use with External Host controller4) Must have OTA feature

author: ebclr
author_rank: Super Contributor
timestamp: April 11, 2017, 10:29:54 pm
content: Forget ESP8266 is obsoleteESP32 is the new kid in the block
Ti DAC53401 Output gets somehow pulled low by I2C? - Page 1
Forum section: electronics / projects

author: Gulftown
author_rank: Regular Contributor
timestamp: February 08, 2024, 05:32:27 pm
content: Hello everyone,i have a project with a DAC53401. if i write the registers after startup, the dac accepts the commands starts up and enables the output normally.But after writing the output voltage to register 0x21 the dac does not accept any more traffic ever again.And somehow the output voltage drops, as soon as there is data written on the bus to any device.After the stop condtion, the output rises again.There is no connection between the output and the i2c, the Vcc is stable at 3.3V and GND is also stable.I can see a little bit of influence on the "CAP" pin of the dac, so the internal LDO is also experiencing a litte drop.Does anyone of you ever had a similar problem, or is the DAC just toast?The blue channel 4 is the dac output.

author: Gulftown
author_rank: Regular Contributor
timestamp: February 09, 2024, 09:19:51 pm
content: Okay, i figured it out.I used a 10k resistor on pin A0. This is the Address Pin and it gets sampled every i2c frame.I gess it 10k is just to high, so the address is changing as soon as the output is enabled.Code:"The A0 pin input can be connected to VDD, AGND, SCL, or SDA. The A0 pin issampled during the first byte of each data frame to determine the address."I still have a little bit of noise when transfering data over the i2c bus, but its a lot better now.
ti lead acid battery charger design - Page 1
Forum section: electronics / projects

author: rastislav
author_rank: Newbie
timestamp: October 09, 2014, 01:40:44 pm
content: Hello,I'm computing values for creating charger of 55Ah Optima battery to be used as a battery backup for my NAS (which uses 12V as input and has DC-DC at input) using BQ24450.From datasheet page 15:http://www.ti.com/lit/ds/symlink/bq24450.pdfI see this formula, which indirectly shows how to compute value for resistor RdVBOOST = VREF × (RA + RB + RC//RD) ÷ RC//RD ? RD = 474.3k?. Pick the closest 1% value of 475k?Although I've had electronics classes I've not seen Rc//Rd .What would be the formula to compute Rd? All other values are known including voltages. It's just I have no idea how mathematically translate the formula.

author: xenocide702
author_rank: Contributor
timestamp: October 09, 2014, 02:04:16 pm
content: x//y (or sometimes x||y) is used to denote "parallel" so Rc//Rd means Rc (in parallel with) Rd. You can use whatever parallel formula you like, I'm fond of Req = (R1^-1 + R2^-1)^-1.

author: eneuro
author_rank: Super Contributor
timestamp: October 13, 2014, 06:41:39 pm
content: Quote from: rastislav on October 09, 2014, 01:40:44 pmThere is no inductor in typical application with this BQ24450

author: Seyar
author_rank: Newbie
timestamp: April 03, 2015, 02:46:16 pm
content: R(d) =R(c)[R(a)-0.9R(b)]/[0.9R(b)+0.9R(c)-R(a)] the 0.9 come if you have Vboost=1.9 and Vref =1. So if you wil other value then you can find (Vboost/Vref)-1 it wil be the nummer that you should mean (*) inside 0.9.

author: hkBattousai
author_rank: Regular Contributor
timestamp: April 04, 2015, 10:38:04 am
content: Once I usedBQ2031. It controls a buck controller and supports three different charging profiles. I recommend it.
TI Precision Labs - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: November 08, 2017, 01:06:31 pm
content: Hi,TI has introduced some cool free video tutorials regarding analog stuff, The only problem so far I have seen is that I can not find any links for downloading videos so we can see it off-line when ever we would like, do you have any idea about extracting the videos for off-line view?https://training.ti.com/ti-precision-labs-op-ampshttps://training.ti.com/ti-precision-labs-adcs?HQS=asc-dc-sar-precisionlabs-bhp-tr-null-wwe

author: ovnr
author_rank: Frequent Contributor
timestamp: November 08, 2017, 01:18:34 pm
content: Youtube-dlgworks fine. Just paste in the URL of the page containing the actual video, likehttps://training.ti.com/ti-precision-labs-op-amps-introduction?cu=14685.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: November 08, 2017, 02:00:34 pm
content: Thanks, have you tried the link?
TI says that 3.3v transceivers are OK for CAN bus. Is their report convincing? - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: January 20, 2020, 04:06:56 pm
content: According to thishttp://www.ti.com/lit/an/slla337/slla337.pdfthere is no disadvantage to using 3.3v over 5v, or mixing 3.3 and 5v devices on the same bus.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 20, 2020, 05:15:44 pm
content: I would expect a reduction in range, but only by a modest ratio, not like orders of magnitude. The common mode emission is annoying, and makes a CMC just about mandatory; but they're commonly found, anyway, so that's probably a non-issue.CAN was derived from RS-485; there's been 3.3V RS-485 transmitters for a long time. The original RS-485 transmitters were implemented in TTL, which only delivers about 3.5V tops, which LVCMOS easily matches.Tim

author: rsjsouza
author_rank: Super Contributor
timestamp: January 20, 2020, 05:17:21 pm
content: Most probably so.AD reference about the same subject:https://www.analog.com/en/technical-articles/can-bus-transceivers-operate-from-33v-or-5v-and-withstand-60v-faults.htmlEEVBlog "reference":https://www.eevblog.com/forum/projects/can-tranceiver-3-3v/

author: Scrts
author_rank: Frequent Contributor
timestamp: January 20, 2020, 05:46:46 pm
content: All automotive designs I've seen so far, even designed today for vehicles to be released in 2022-2023 still use transceivers powered from Vcc=5V, but VIO is set to 3.3V.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: January 20, 2020, 06:20:41 pm
content: We use the TI transceivers from powered from 3.3V with a 125 kbps data rate with no problems.

author: rvalente
author_rank: Frequent Contributor
timestamp: March 14, 2020, 12:07:55 pm
content: Quote from: Scrts on January 20, 2020, 05:46:46 pmWhat transceivers are companies using today? Last time I've worked with OEM automotive we where using TJA1054 and TJA1050, there was a newer version of 1054 in 3v3Quote from: Tomorokoshi on January 20, 2020, 06:20:41 pmWould it be for automotive or industrial equipment? Which PN have you been using?

author: Tomorokoshi
author_rank: Super Contributor
timestamp: March 14, 2020, 01:33:07 pm
content: We use the SN65HVD230DR in industrial equipment at 3.3V.https://www.digikey.com/products/en?keywords=296-11654-1-ND

author: Mazo
author_rank: Regular Contributor
timestamp: March 14, 2020, 09:53:48 pm
content: As someone working in the automotive business,TJA1042 and TJA1055 are widely used by the company I work for(major supplier for a lot of car makers).All supplied by 5V.
TI serial Full Portable Keyboard: looking for doctumentation - Page 1
Forum section: electronics / projects

author: DiTBho
author_rank: Super Contributor
timestamp: November 02, 2020, 11:44:01 pm
content: hiI am looking at the TI serial Full Portable Keyboard for TI Graphing Calculators that Texas Instruments made compatible with TI-83 TI-89 TI-92 and such.It uses the serial (i2c-like) link offered by Texas Instruments for their TI-Calculators, which is cool! But I am not able to find any information on its protocol.Has anyone ever tried to use it in a personal project? So is there any doc about?please let me knowthanks in advance
TI SM72442 panel mode required? - Page 1
Forum section: electronics / projects

author: evjim
author_rank: Contributor
timestamp: February 28, 2017, 03:08:27 am
content: This is a very specific question, but I received no reply on the TI website, not sure how to get support.https://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/p/573705/2119092#2119092Here are the docshttp://www.ti.com/product/SM72442/technicaldocumentsQuoteedit: seems like a TI guy may be looking into it now

author: adammunich
author_rank: Contributor
timestamp: June 15, 2022, 01:39:50 am
content: I found that pulling PM pin high seems to disable panel mode
TI Voyage 200 Repair Video - Page 1
Forum section: electronics / projects

author: pknoe3lh
author_rank: Regular Contributor
timestamp: March 06, 2017, 09:55:36 am
content: Hey Everyone!Want to share my YouTube Video of the repair of my Voyager 200 where I replaced the Display.YouTube:https://youtu.be/Mem8wmdTyFw(English Version)https://youtu.be/u74etmyXra0(German Version)Photos:https://goo.gl/photos/9UwCRkS8hzEKvhMJ6DataSheets:http://ww1.microchip.com/downloads/en/DeviceDoc/61168E.pdf(pic32mx250f128b)http://www.electrodragon.com/product/3-5-320x480-tft-lcd-module-for-arduino-8-bit-parallel/(LCD)http://www.ncsys.co.jp/webshop/GTV350MPZI04(ILI9481).pdf(LCD)GreetingsPatrick

author: Arielo
author_rank: Newbie
timestamp: September 06, 2017, 05:15:15 pm
content: Hello Patrick,I've watched your video, and it was an interesting repair the one you did.I'm curious about the LCD, I have the same LCD display, and I'm very new to GUI and LCD programming. I've been using MCUs for a few years now, interfacing the user via computer (usart), or some 16x02 LCD, and recently, some nokia 5110 lcd displays, but I wanted to go a bit further, and start using some color LCD, and learn a little about GUI programming.Could you point me to some books, or websites to learn more about this? Which library did you use to interface the MCU with the display? I've used PIC32MX250F128B before, but I wanted to use an STM32 now.Thank you!

author: pknoe3lh
author_rank: Regular Contributor
timestamp: October 10, 2017, 01:57:40 pm
content: Hallo Arielo,Sorry for the late reply :-(Quote from: Arielo on September 06, 2017, 05:15:15 pmIts very basic :-( I just relay the data from the voyage200https://github.com/pknoe3lh/voyager200repair/I think Microchip offers some very capable graphics libraries:http://www.microchip.com/design-centers/graphicsGUI programming it self is its own science ....I did something in this direction in my Bachelor Thesis (but it was mainly about the platform...):https://drive.google.com/file/d/0BwT_vqurq8C9N3pNOG56c3JlWDg/view?usp=sharinggreetingsPatrick
TI069A1 vs TI046B1 - Page 1
Forum section: electronics / projects

author: PON
author_rank: Newbie
timestamp: March 10, 2020, 08:14:23 pm
content: Hi everyone,I have a Lexmark toner chip with TI069A1, and searing i findhttps://www.eevblog.com/forum/projects/lexmark-toner-chip-ti046b1.After scaning with arduino i find this i2c have similar adress: 0x78 or 0xF8.THE CHIP ALSO ARE VERRY SIMILAR.When i try to read with wire, or read function describe on post from up, they return me 0x00.Can someone help me to understand why?

author: AE7OO
author_rank: Regular Contributor
timestamp: March 14, 2020, 03:48:52 am
content: Greetings,Being unable to find a datasheet, all I have are some guesses.I ran into the same kind of problem when taking apart some older Dell battery packs that used TI controllers. TI had made them custom for Dell and data was not available. I got lucky on one of them in that a former tech posted diagnostics data;All of the others I ended up just salvaging the cells.Now the chip, if I had to guess, it has some type of built in security protocol. The problem is that all we really know is the I2C address, and not much more.To get any further your really going to have to have it in circuit and put a logic analyzer on it.If you get real lucky, someone from the boards might know how to unlock it.GB
TIC154A, RDX0154GC, etc., 132 X 64 FSTN LCD UC1601S controller – sources? - Page 1
Forum section: electronics / projects

author: Chris56000
author_rank: Frequent Contributor
timestamp: September 18, 2020, 01:11:28 pm
content: Hi!Does anyone know if there's a readily equivalent 132 x 64 or similar type of GraphicFSTN module with a UC1601S controller that will go in Member Liv's SG–642 Sine Generator Project?He originally quoted "TIC151" on his circuit diagram, but that appears to be obsolete, and looking up the "TIC154A" and the "RDX0154GC" equivalent types only gives me loads of nonsense results or bits for rotten American tractors!!The display is 132 X 64 format, FSTN type, UC1601S controller and is 65 X 47 mm in size, has a viewing area of 51 X 27 mm, four pins on the top and ten along the bottom, and is physically it looks like the sort you used to get on old DVMs where long pins are bonded direct to the glass module!(Hasn't anybody told Google and eBay that there's other things made besides rotten tractors yet?!)Chris Williams

author: Chris56000
author_rank: Frequent Contributor
timestamp: September 18, 2020, 02:20:49 pm
content: PS!Further to the above, can anyone recommend a more readily available display of suitable size for this that is cheap and is illuminated white–on–blue like Liv's original?Liv provided the source code – is it simply a matter of deleting the UC1601S library, substituting it for one written for a more readily available display controller type and recompiling?I have attached the source code/hex for the two ATMEGAs he used below!Chris Williams
TID122 any known substitutions?  - Page 1
Forum section: electronics / projects

author: Crambone
author_rank: Frequent Contributor
timestamp: September 14, 2023, 07:56:38 pm
content: I’m looking for a substitution for a TID122 any help would be appreciated!Drew

author: PCB.Wiz
author_rank: Super Contributor
timestamp: September 14, 2023, 11:02:21 pm
content: Quote from: Crambone on September 14, 2023, 07:56:38 pmIt would help to explain what that is ?Google suggests it is a DIP14 8 rectifier diode array with common pin. Strange part.No one is going to make that in 2023, but you could build one using a DIP14 former, if you need to service something.For new designs, you might select something made in large enough volumes, eg parts like 2 x 1SS309

author: coromonadalix
author_rank: Super Contributor
timestamp: September 14, 2023, 11:48:46 pm
content: same here, some details would help, and help you get some return
Tie DC PSU 0V to mains earth? - Page 1
Forum section: electronics / projects

author: GoneTomorrow
author_rank: Regular Contributor
timestamp: May 20, 2020, 05:52:25 am
content: Long story short I'm designing a controller for some industrial equipment. There's a couple of opto-coupled inputs designed to take a non-polarised 24VDC signal, basically just an on-off input, into the micro. When it comes to the particular installation one of the inputs will be connected to a remote timer with a relay output. To get it to work I'll take 24V from the PSU on my controller board and send it up a wire, through that remote relay, and then back into one side of the optocoupler, and then ground the other (to 0V on the PSU).The PSU I'm using is a small PCB-mount Meanwell with an isolated DC output, which means that presumably the output will be shifted about halfway up the mains voltage relative to earth due to the filter capacitors. Should I tie the 0V/GND output of this PSU to mains earth so that it's not floating at 100 ish volts? Does it matter in this case? What are the considerations when deciding whether to use a floating DC output or tie it to ground? I assume one would be ground loops or stray currents flowing between things, which doesn't apply in this case.Cheers!

author: Gyro
author_rank: Super Contributor
timestamp: May 20, 2020, 10:29:47 am
content: If your inputs and outputs are optos and relay type devices then I would probably opt for grounding the supply output. You're unlikely to meet any ground loop issues in these circumstances - in fact Y cap leakage currents on the outputs could be more troublesome (and also for your internal micro's I/O pins if you're using a scope or other grounded test gear during debug). ESD susceptibility and ease of clamping might be another factor.I work on the basis of 'is there a compelling reason fornothaving an internal supply ground referenced?'.

author: GoneTomorrow
author_rank: Regular Contributor
timestamp: June 03, 2020, 03:35:43 am
content: Didn't even realise this had posted as I got a HTTP 500 when I submitted it.Thanks, I guess that makes sense to look at it that way: "is there a reason to not ground" vs "is there a reason to ground."I think I've just been mentally scarred about proper grounding (or not) after dealing with professional audio equipment. Changed my mounting holes to pads connected to the ground plane.
TIL111 - 4 IC package - Page 1
Forum section: electronics / projects

author: ElectricGuy
author_rank: Regular Contributor
timestamp: November 25, 2015, 01:56:00 pm
content: Hi All;I have a project that has some years and i'm about to do a hardware revision.In this project i use 4x TIL111 opto DIP package, but now i want to shrink the PCB.Does somebody know a TIL111 equivalent but with the 4x optos in one soic smd package?( If possible available in RS, since it's the place where i buy my components )Thank you

author: jeroen74
author_rank: Frequent Contributor
timestamp: November 25, 2015, 03:57:49 pm
content: Google for 'soic quad optocoupler'

author: ElectricGuy
author_rank: Regular Contributor
timestamp: November 25, 2015, 07:06:31 pm
content: Quote from: jeroen74 on November 25, 2015, 03:57:49 pmThank you very much for your answer jeroen74, but my point here is to "hear" your opinion about an similar IC that you have allready worked before.In google there are many, but i don't have feedback of the performance.That's why i asked help here!

author: Andreas
author_rank: Super Contributor
timestamp: November 29, 2015, 06:10:51 am
content: Quote from: ElectricGuy on November 25, 2015, 07:06:31 pmSorry,If your only requirement is "space saving photocoupler available at RS" then you cannot expect any useful answer.So what are your requirements (isolation voltage , switching speed, current ...)Usually the isolation voltage determines the package area which is necessary.with best regardsAndreas

author: ElectricGuy
author_rank: Regular Contributor
timestamp: November 30, 2015, 03:26:15 pm
content: Quote from: Andreas on November 29, 2015, 06:10:51 amHi Andreas and thank you for your answer.I didn't say this "space saving photocoupler available at RS"!!!Actually i said;"Does somebody know a TIL111 equivalent but with the 4x optos in one soic smd package?( If possible available in RS, since it's the place where i buy my components )"So the requirements are equivalent to TL111, and "if possible" available on RS, not mandatory.On my search i found one part that can fulfill my requirements, but i need to test. It's a toshiba, don't recall the reference, because i'm not at home.
TIL305  Dot display project i saw on hack a day - Page 1
Forum section: electronics / projects

author: coromonadalix
author_rank: Super Contributor
timestamp: April 15, 2019, 10:56:45 am
content: tought it was worth to mention ?https://hackaday.io/project/161694-diytil305https://hackaday.io/project/161694-diytil305/log/161004-finishing-up-diytil305-12

author: Kjelt
author_rank: Super Contributor
timestamp: April 15, 2019, 02:23:25 pm
content: Very cool project

author: Rolo
author_rank: Regular Contributor
timestamp: April 15, 2019, 04:18:09 pm
content: Nice, I always had a soft spot for these type of display's. Would like to mention that Pimoroni has a Raspberry PI hat with six of these LTP-305 display's, (the Micro Dot pHAT) available in red and green. I have no relation with this company, just a tip. A great vintage look!

author: bitseeker
author_rank: Super Contributor
timestamp: April 15, 2019, 11:01:52 pm
content: Wow, that's quite the soldering project (0201!). The rectangular shape of the LEDs and diagonal orientation gives it a unique aesthetic.
TIL311 - Page 1
Forum section: electronics / projects

author: sonnytiger
author_rank: Frequent Contributor
timestamp: January 17, 2014, 12:09:20 pm
content: I did a little video on this guy because I always thought it was pretty cool. If you have never heard of it, it's a single digit hex display with built in logic to drive the leds, all you have to do is interface with four data pins and a latch.

author: Thor-Arne
author_rank: Unknown
timestamp: January 17, 2014, 01:44:47 pm
content: These little displays is really cool, and they is very useful for circuits without a mcu.Also, there is the TIL306 with a decade counter and BCD output. Very useful.

author: sonnytiger
author_rank: Frequent Contributor
timestamp: January 17, 2014, 02:40:04 pm
content: That one is cool, seems rather similar to the 311, though the package seems really long compared to the digit size haha.

author: Thor-Arne
author_rank: Unknown
timestamp: January 17, 2014, 04:17:49 pm
content: Yes, packages is rather large.But compared with using separate counters/latches/drivers a lot of board space is saved.

author: zapta
author_rank: Super Contributor
timestamp: January 18, 2014, 04:47:46 am
content: These displays used to be high end and very expensive. They are not 7 segment, they do round corners and look much better.

author: Rufus
author_rank: Super Contributor
timestamp: January 18, 2014, 01:28:42 pm
content: The problem with these ancient parts is power consumption. 5v only and typically 105mA to while displaying a zero, max to display a zero is 180mA.The power for a TIL311 two digit display could run a 5" LCD with backlight.

author: sonnytiger
author_rank: Frequent Contributor
timestamp: January 18, 2014, 01:44:43 pm
content: Sure they draw a lot of power, but, they just look so... awesome!They are still very expensive! 0_o
TIL311/DIS1417 running damn hot - Page 1
Forum section: electronics / projects

author: bd139
author_rank: Super Contributor
timestamp: September 09, 2017, 04:58:16 pm
content: Got 5x DIS1417 displays. They are pulling 500mA idling and are getting rather hot. Currently I'm looking at 49oC! Is this normal?

author: sasa
author_rank: Regular Contributor
timestamp: September 09, 2017, 05:37:05 pm
content: Have you found this?Seems there is no datasheet for DIS1417, but TIL311 seem the same thing. In TIL311 datasheet, consumption is indeed quite high.

author: bd139
author_rank: Super Contributor
timestamp: September 09, 2017, 05:51:38 pm
content: To be honest I read the data sheet and just shrugged off the current. The temperature is going to be interesting as I was going to put this in a small metal enclosure.
Time delay circuit to control the direction of rotation of a DC motor  - Page 1
Forum section: electronics / projects

author: shamooooot
author_rank: Regular Contributor
timestamp: November 30, 2023, 07:15:57 am
content: HiI am trying to design a circuit to use to control a DC motor according to the output of a capacitive proximity detector.- The circuit should turn ON the DC motor in forward direction when the hand approaches the pad (MTO pin of MTCH101 is low).- I am going to use limit switches to stop the motor rotation when the door reaches the limit.- When the hand becomes out of range the circuit should hold for 4 seconds, then turn the DC motor in reverse direction.- Again another limit switch will be used to stop the motor when it reach the other limit.I am looking to for a simple and really cheap design without using microcontrollers.https://www.microchip.com/en-us/product/mtch101

author: Whales
author_rank: Super Contributor
timestamp: November 30, 2023, 09:15:31 am
content: For directional control of your brushed motor you will probably want an off-the-shelf motor driver ("H-bridge") that has EN (enable) and DIR (direction) input pins.You are going to require multiple timing devices OR a very slow RC circuit and multiple comparators (and digital logic chips). EDIT: Actually there might be very clever ways to do this with only one 555 timer and some logic gates. Not sure.What's your motivation for not wanting to use a microcontroller?EDIT: Will this motor be controlling something safety critical, ie something that could hurt someone? That dramatically changes the sort of suggestions I might give.

author: PSR B1257
author_rank: Frequent Contributor
timestamp: November 30, 2023, 09:35:55 am
content: R7 issomewhatinhibiting the function of the LMC555And the connection 'discarge' to 'Vdd' gives a short circuit.You can certainly use such timers for this task.As far as powering the motor, you can use the suggested integrated driver bridge, or simple two relays with one change-over contact each.P.S.: A timing-diagram is preferred over long verbal descriptions. And they leave no room for interpretations.

author: Terry Bites
author_rank: Super Contributor
timestamp: November 30, 2023, 03:16:00 pm
content: Yes, a timing diagram is always useful.It might be preferable to use a retriggerable monostable.Then you get timeout 4s after last touch instead of timeout after first touch.A 555 or any CMOS Schmitt input gate can be used to achieve this.eg
Time Domain Reflectometer - Page 1
Forum section: electronics / projects

author: Aztlanpz
author_rank: Regular Contributor
timestamp: December 29, 2019, 01:15:14 pm
content: I have created a Time Domain Reflectometer; Let me know if anyone is interested I will post the project.Azltan

author: BradC
author_rank: Super Contributor
timestamp: December 29, 2019, 01:16:25 pm
content: I'd be interested in some more details.

author: lwatts666
author_rank: Unknown
timestamp: December 30, 2019, 07:28:40 am
content: Looks very similar to the one published in Silicon Chip magazine December 2014...

author: Aztlanpz
author_rank: Regular Contributor
timestamp: December 30, 2019, 07:53:28 am
content: Yes it’s base on that one

author: tggzzz
author_rank: Super Contributor
timestamp: December 30, 2019, 09:53:20 am
content: Specification?Form that schematic it looks like a signal generator, not a TDR.

author: magic
author_rank: Super Contributor
timestamp: December 30, 2019, 10:33:26 am
content: What's the point of the opamp? It seems to be a unity gain buffer, which could be replaced with a bunch of paralleled 74 gates.

author: jmelson
author_rank: Super Contributor
timestamp: December 30, 2019, 08:36:47 pm
content: So, what is the rise time of the output? If not fast (like sub ns) then it is only useful for characterizing long cables. I often what to test fairly short cables, around 1 m length.For that, you need a really fast rise time.Jon

author: magic
author_rank: Super Contributor
timestamp: December 30, 2019, 09:32:09 pm
content: OPA356 slew rate is rated 0.36V/ns so you can imagine...The circuit below works nicely, I have built it using the dual version of that chip to avoid exceeding absolute ratings on output short circuit. Optimum output resistor for TI version is 91Ω per pin. I brought the capacitor even closer which should reduce ringing further, but I can't verify because my scope is 200MHz and all I see is a flat line.https://www.eevblog.com/forum/testgear/fast-rise-time-2ns-or-1ns-signal-generator/msg564319/#msg564319

author: Qmavam
author_rank: Regular Contributor
timestamp: January 01, 2020, 07:59:45 pm
content: I bought an inexpensive Time domain Reflector based on a SN74AC14N.https://tinyurl.com/rnz6aagI had installed a BOG antenna, (Beverage on Ground), it has been a few years, but I recall the impedance was high, so I modified the output resistor to get the reflectance bump to a larger difference, making it easier to measure. I don't recall, the measurement, but I just checked and the output impedance is 575 ohms.So I like your idea of variable resistors.When I did this I dragged my scope and extension cords out in the field to use. I'll be doing it again, my BOG area got cleared after a hurricane, backhoes and bulldozers cleared the area of trees along with all my BOG. I could have saved some of it, but had to much going on with home repairs. Mikek
Time Machine build started - Page 1
Forum section: electronics / projects

author: Stonent
author_rank: Super Contributor
timestamp: July 27, 2014, 03:42:01 pm
content: For previous information about the project here's the link:https://www.eevblog.com/forum/projects/time-machine-display-for-my-wife's-school-ideas-needed/After these were taken, we came up with a layout for the LEDs. She wants a green LED and a switch next to each student's name in her class so she can turn the lights on and off.This is mainly designed as something cool for the "Meet the Teacher" night next month so as she meets parents of the kids, she'll flip the switch next to their name.The clock will be mounted and set to spin backwards. There will be some 7 segment displays in the middle showing a date. Originally thought we would just control it all from a microcontroller, but she wanted an easy way to change the dates so we may end up cheating and using 8 way dip switches on each segment where she can flip the segments on and off. I know it isn't cool but it will save some time considering we only have about 3 weeks left to finish and most of the work is being done on weekends. I still plan to do something MCU related and have ordered more shift registers.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 27, 2014, 04:39:11 pm
content: Am disappointed the thread didn't say "Time Machine build finished". Later reply saying "started".
Timed charge circuit needs to be a pulldown? - Page 1
Forum section: electronics / projects

author: asgard
author_rank: Regular Contributor
timestamp: April 10, 2015, 06:08:13 pm
content: I have a project for a timed flop action using Schmitt logic. Here S1 starts C1/R1 and C3/R4 charging when pressed. The input at U1B will reach threshold first, which sets the gate of Q1A high. With S1 still closed the second input at U1D reaches threshold later, and resets the flop, setting the gate low. This circuit worked fine for me in a breadboard, but in a pcb things got weird. I think there is an input pin "flapping in the breeze", so to speak. I can touch pin 1 of S1 with a single probe from my multimeter and the circuit resets. That means there is coupling from my finger through the lead into the inputs at U1D. Okay, fine. I have done these things before, and the usual fix is to have a pull-up resistor and have the switch short to ground. Easy peazy, right? I think, though, that somehow the logic for U1C and U1D must be reversed if I wanted the switch to short C3/R4 to ground. Or am I mistaken?
TimeLab - how to capture and plot an "absolute" value - Page 1
Forum section: electronics / projects

author: iMo
author_rank: Super Contributor
timestamp: December 21, 2018, 04:25:27 pm
content: Is there a trick how to capture and plot an "absolute value" ie. voltage (EFC voltage), or DAC values?From what I see the captured values are always shown as "ratio".
Timmy Clone project - Page 1
Forum section: electronics / projects

author: natej2010
author_rank: Newbie
timestamp: May 27, 2013, 11:28:50 pm
content: So I had a friend dump a project off on me and I decided it would be fun to put it together. Its for a guitar pedal. The schematics are quite easy to find but what I wanted was help breaking down the circuit so I can better understand what each part does that whay I can tweak the design and possibly expand on it. So if anyone wants to break it down to the fundamentls I'd appriciate it. Thanks!!!http://3.bp.blogspot.com/_y4AYtND8Hz8/SDNMRfHYKEI/AAAAAAAAALI/LjTrmxycb4c/s1600-h/tream2ed5.png

author: IanJ
author_rank: Unknown
timestamp: May 28, 2013, 11:01:21 am
content: Very basic circuit as far as guitar effects go.Starting at top left:-Adjustable input filter into op-amp with diodes used to clip the signal (adds distortion to the sound). There's a switch on the feedback of the op-amp to select in two additional diodes thus adding in extra distortion.There's also a pot to adjust the gain of the op-amp thus the amount of distortion/volume.The op-amp output then feeds another adjustable filter and into the output buffer op-amp where you also have a volume pot.You'll notice vref on the diagram, that's to offset the op-amp for use with a single rail supply.PS. I'd add an ac coupling cap to the input before doing anything else, and for info you'll probably get away with other types of op-amps, no need to use the one detailed. Different op-amps may give you a different colour to the sound.Ian.

author: Rerouter
author_rank: Super Contributor
timestamp: May 28, 2013, 11:18:20 am
content: spot on, though i have to question the purpose of the link between the 4 diodes, really i cannot see that having any purpose....

author: natej2010
author_rank: Newbie
timestamp: May 28, 2013, 01:41:11 pm
content: Thanks for you input Ian. I've put it together once a while back but the on off switch didn't work. So I'm going to rebuild it and try to improve on it. Now that I have more free time.

author: Hideki
author_rank: Frequent Contributor
timestamp: May 28, 2013, 10:32:04 pm
content: I added some notes to the image. There is already an AC coupling cap, and the link between the diodes will have very little effect.