hybridfree/eevblog-posts huggingface dataset:
Issues with an Ideal Diode - Page 1
Forum section: electronics / projects

author: machinehum
author_rank: Contributor
timestamp: July 12, 2023, 02:43:53 am
content: I'm having some issues with this ideal diode circuit.When powering from Vin, there is a small voltage drop across Q7 0.01V or so. So Q7 is turning on with no problem. I can draw load from 12V, 1A, and Q7 isn't breaking a sweat. This mode is working.However when I power the circuit from the 12V, strangely I'm seeing ~3.3V at the Vin pin. I'm not sure how this is possible, but when I draw load Q3 will get hot. So I think it might be flowing out of Q3B.4? But this is a PN junction, so unless I've exceeded the reverse breakdown of the junction this shouldn't be possible. Does anyone know this value on the datasheet? Any other help would be much appreciated!

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: July 12, 2023, 02:52:16 am
content: Base-emitter breakdown is often 5V or so. This isn't a bi-directional circuit and is probably doing just as you suggest. Nothing "ideal" about it compared to what a real diode does.

author: PCB.Wiz
author_rank: Super Contributor
timestamp: July 12, 2023, 03:05:09 am
content: I happened to have this openhttps://www.diodes.com/assets/Datasheets/AP74700Q.pdfthat's a better ideal diode controller, charge pump for N-FETor, there is a simpler version that I think is a fixed version of your SCH, without VBE reverse effect, P-FET.https://www.diodes.com/assets/Datasheets/DZDH0401DW.pdf

author: machinehum
author_rank: Contributor
timestamp: July 12, 2023, 04:42:23 pm
content: Quote from: PCB.Wiz on July 12, 2023, 03:05:09 amThanks for the parts. I'm going to axe what I have and go for one of these guys. I like the first one.

author: stowwest
author_rank: Newbie
timestamp: September 07, 2023, 03:51:50 am
content: Quote from: PCB.Wiz on July 12, 2023, 03:05:09 amThanks for your extremely detailed and helpful feedback.

author: Smokey
author_rank: Super Contributor
timestamp: September 07, 2023, 04:51:09 am
content: I've been using the lm5050 recently for some stuff. Been working great.https://www.ti.com/lit/ds/symlink/lm5050-1-q1.pdf

author: Peabody
author_rank: Super Contributor
timestamp: September 07, 2023, 05:17:16 pm
content: Could someone explain what the original circuit is supposed to do and how it works? What do the bipolars do?

author: Zero999
author_rank: Super Contributor
timestamp: September 07, 2023, 05:36:56 pm
content: Use another pair of matched transistors, as diodes, to block the reverse voltage. The circuit below shows how it can work at voltages higher than the gate-source rating of the MOSFET. If the voltage never exceeds the gate source voltage rating, or the MOSFET's have built-in clamps, D1 and D2 are unnecessary.LTSpice Simulation
Issues with capacitive touch. Need suggestions.  - Page 1
Forum section: electronics / projects

author: Hootis Tigglebits
author_rank: Contributor
timestamp: November 11, 2023, 04:13:54 am
content: So I’ve rigged this solder dispenser up. It features a lipo charger, 3.7v lipo battery, TTP223 capacitive touch board with 47pF capacitor added to dull the sensitivity, the trace to the touch sensor on the backside has been cut and I added an external trigger wire attached to the needle. As you can see in the video below it works fine like this, but when I insert solder wire through the needle it becomes unpredictable and either won’t work when the solder wire is touched or will run continuousl which I’m guessing is due to the length of the solder wire changing the sensitivity of the touch and/or the auto calibration of the TTP223. Does anyone have any recommendations on how I can fix this or a better suited IC for this project? Thank you.https://youtu.be/1woOxOE5BTE?si=hqmUrynakopUDeBq

author: CountChocula
author_rank: Unknown
timestamp: November 11, 2023, 02:34:06 pm
content: Did you try pulling down LPMB and pulling up SLRFTB? That might help mitigate the problem a bit. Another alternative might be to try and isolate the wire away by using a teflon-coated needle, but ultimately with a coil of solder wire you're adding a big antenna to the circuit, so I'm not sure that you can really get away with it.Edit: Another alternative is to not rely on contact with the soldering iron as a trigger for the feeder mechanism. The only automatic dispensers I have ever seen use a foot pedal, probably because the flow of solder would be too unpredictable otherwise. Perhaps consider using a different approach where you control the motor with your body instead (e.g.: still using a capacitive sensor, but requiring your hand or fingers to touch some surface in order to trigger the motor).
Issues with wiring USB2.0 in a USB C plug - Page 1
Forum section: electronics / projects

author: pini.grigio
author_rank: Contributor
timestamp: October 19, 2022, 09:21:02 am
content: Hi,I've got a USB 2.0 project which I want to fit with a USB-C plug. I've already confirmed that it works fine with USB-A.I have a bunch of USB-C plugs with USB 2.0 breakouts, to which I've soldered my D+/-, Vcc and ground.On the breakout there's a 56k pull-up from the CC pin, as per the specs.However when connecting to a USB-C port the device does not show up.Oddly enough, if I connect it through a USB-C to USB-A adapter it does work.On top of that - if I connect that USB-A adapter through a USB-A to USB-C adapter to the same USB-C port - it still works, so I know my USB-C port isn't defective.I've already tried it on a different computer to the same effect.Since the wiring is good and so is my port, the only thing I could think to fault is the pull-up resistor on the breakout, but it measures ok.Am I missing something?I see a lot of these breakouts are sold without the pull-up resistor so my next step would be to remove it and see if it makes a difference, but I'd appreciate any ideas beforehandThanks

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 19, 2022, 12:43:15 pm
content: Device side should have 5.1k resistors from each CC pin to ground.
It could be a great project box. - Page 1
Forum section: electronics / projects

author: DavidDLC
author_rank: Frequent Contributor
timestamp: November 23, 2013, 06:54:17 am
content: Some time ago I bought a 2.5" USB to SATA Enclosure SIIG brand, and I just discovered that it can be a great project box!It is a beatufil anodized aluminum, and it has a port for USB and LED already on it.I bought it for about 16 dollars, so it is not that expensive.David.

author: matkar
author_rank: Regular Contributor
timestamp: November 23, 2013, 05:32:35 pm
content: Yes, but what can you fit in a box like this? You have to use low profile components, majority of classic electrolytic capacitors won't fit, you have to conceal LED and USB connector if you don't use them or make a bigger hole to fit some other type of connector, there is a limited number of connectors that will fit the height, there is no reasonable way to fix the circuit board inside...Plus you can buy anodised aluminium project boxes on ebay for the third of the price you paid for it. I also considered using this type of enclosures for such purposes but soon changed my mind.
It used an L293D and a, uhmm, err, and a... - Page 1
Forum section: electronics / projects

author: intabits
author_rank: Frequent Contributor
timestamp: February 24, 2020, 10:28:22 am
content: Many years ago a friend showed me a small stepper motor (from an old Tandon 20MB hard disk drive) being controlled by two DIP chips, and working very nicely. I remember that one was the L293D dual H-Bridge, but can't recall what the other was, or find any reference that includes another chip typically used with the L293D. Sadly, my friend is no longer with us, so I can't ask him about this.I believe the second chip had a similar part number to the L293, and was a standard chipset "companion" for it. IIRC, it would take 2 signals, Step and Direction, and generate the 4 phase signals needed by the L293.Does this ring any bells?Can anyone tell me what this second chip might have been?

author: brabus
author_rank: Frequent Contributor
timestamp: February 24, 2020, 10:37:25 am
content: L297

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 24, 2020, 10:37:40 am
content: Likely thinking of L297? Paired with L293 (DIP) or L298 (tabbed "Multiwatt") and some support components, you get a full current mode stepper controller.Modern solutions are fully integrated, MOSFET based (far less voltage drop), can switch faster, offer fractional or micro stepping, and can be controlled by serial buses (I2C, SPI).Tim

author: intabits
author_rank: Frequent Contributor
timestamp: February 24, 2020, 11:33:33 am
content: L297 - That's it!I was looking at a simple project using mini motors and leadscrews from DVD drives, and thinking about cheap and cheerful ways of driving them.I've done it with cheap L298 modules, but they need 4 I/O lines/motor, so I wanted to look at this forgotten (by me) chip to see how it might help.Yes, I know there are much better/smarter solutions out there. And I've used some of the lower end ones with larger motors happily, but for these mini motors, L293Ds are fine.Thanks for the help!
It was meant to be so simple :( Square wave inverter + low battery indicator. - Page 1
Forum section: electronics / projects

author: RIKRIK
author_rank: Contributor
timestamp: October 04, 2019, 09:56:33 pm
content: Okay this is a update from a post last month, had afew things going on, testing different circuit's, deleted alot of the old post as the circuits has been further improved on, well id like to think so..... so it was meant to be simple, i wanted to design a cheap , low cost square wave inverter for 220v led bulbs, that could be easy to understand while being easily repairable.Kept finding the same circuit online using a astable multi vibrator, meant to be square wave, was a saw tooth, did some tests and after changing every component excluding the mosfet's and transistors. plus adding afew moremy simple circuit had became a little more complicated , but i reckon its simple enough, after one prototype on veroboard i can make up others without needing to look at a scem, then theirs the low battery indicator. in-which i tried to use the same components to keep the amount of different parts down.Anys tell me what you think, and please remember it isnt meant to be high tech, or highly efficient, its what it is.. a square wave inverter. Also disclaimer, it is dangerous to work with high voltages.
ITA02N65A datasheet - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: September 10, 2019, 06:35:05 pm
content: Can not find the datasheet for the ITA02N65A. Can someone share this?Regards,

author: alpher
author_rank: Frequent Contributor
timestamp: September 10, 2019, 06:40:35 pm
content: 2N65A, maybe?

author: sdancer75
author_rank: Frequent Contributor
timestamp: September 10, 2019, 07:08:22 pm
content: Quote from: alpher on September 10, 2019, 06:40:35 pmNot sure, maybe ! It's from a switching power supply, and 2N65A seems to be a mosfet.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 10, 2019, 07:11:55 pm
content: Yeah, and it appears to be primary side, so 650V would be typical beside a 400V capacitor.http://www.inpowersemi.com/en/product_display.php?title=ITA02N65Looks to be about as good as you're going to find...Tim

author: sdancer75
author_rank: Frequent Contributor
timestamp: September 10, 2019, 07:20:39 pm
content: Quote from: T3sl4co1l on September 10, 2019, 07:11:55 pmThanks, Tim!
ITeadStudio - Page 1
Forum section: electronics / projects

author: x18
author_rank: Contributor
timestamp: November 29, 2011, 04:54:16 pm
content: hi,on their website is written: "Drills line and long slot can’t be accepted."Is it possible to send them a pcb with an non-rectangular board outline? i want to order a pcb with a heart-form-outline. is that possible?

author: 8086
author_rank: Super Contributor
timestamp: November 29, 2011, 04:56:02 pm
content: They definitely don't have to be exactly rectangular. I have had boards made with cut outs at the corners etc. I think it should be fine, and they will always let you know if it isn't.

author: Unknown
author_rank: Unknown
timestamp: November 29, 2011, 05:26:29 pm
content: I believe this refers to internal slots, probably to prevent you sending them panelized designs. Seeedstudio (close competitor) has similar rules.

author: metalphreak
author_rank: Frequent Contributor
timestamp: November 29, 2011, 08:28:36 pm
content: Yeah some people try to use a long line of closely spaced drill holes, so they can snap apart the boards later. iTead/Seeed don't like this because:1. They don't really want you panelising designs (although I've done it before and separated the PCBs myself in the past)2. The huge number of drill hits wears out their tools quickly and the board houses *really* don't like it. Routing or V-scoring is much more efficient, but costs extra.I have read in the Seeed forums that they are ok with internal cutouts within reason. It's always free to email them with a sketch or diagram of your PCB to ask. A board with its outline in the shape of a heart shouldn't be an issue.

author: slateraptor
author_rank: Frequent Contributor
timestamp: November 30, 2011, 04:47:41 pm
content: Quote from: 8086 on November 29, 2011, 04:56:02 pmMy self-diagnosed dyslexia led me to believe that "The PCB size is smallest rectangle that can accommodate PC" meant rectangular board outline only. I just might use them again...especially since they offer cheaper-than-dirt 4-layer service now.

author: Chet T16
author_rank: Frequent Contributor
timestamp: November 30, 2011, 05:17:24 pm
content: I also read it as being rectangles only but its just how its worded apparently
ITech IT5601 Thermal Data Logger - Page 1
Forum section: electronics / projects

author: derZockerMP
author_rank: Regular Contributor
timestamp: November 20, 2024, 07:16:28 am
content: Hello, did anyone have the Communication Manual of the IT5601 Thermal Data Logger. It can only communicate with the PC and have no front display or buttons. Is there a way of finding the commands? It can be controlled via USB, Lan or RS232. Via USB a driver is needed that I didnt have. But via RS232 I can send some standard commands from other devices, there ITech have a manual avaiable. Exists a help command that lists all possible commands? Did not get a proper answer form ITech.Best Regards

author: derZockerMP
author_rank: Regular Contributor
timestamp: November 27, 2024, 06:50:00 am
content: Nobody an Idea?This thing is sadly crap without the ability to send commands to it :'(

author: derZockerMP
author_rank: Regular Contributor
timestamp: June 06, 2025, 10:07:52 am
content: Hello, push up for this thread. Contacted Itech serveral times and they are not wiling to send me over the programming manual for this device. Has anyone cotact to ITech to manage to get this manual?Thanks in advance,Stefan
its not UFO its UFT!! - Page 1
Forum section: electronics / projects

author: angelothewolf
author_rank: Contributor
timestamp: September 11, 2013, 07:17:30 pm
content: this is my new acronym for Unidentified Fu...%$# Transistorsomebody know what this is?

author: Bored@Work
author_rank: Super Contributor
timestamp: September 11, 2013, 07:28:40 pm
content: ---> Trashcan

author: angelothewolf
author_rank: Contributor
timestamp: September 11, 2013, 09:22:20 pm
content: Quote from: Bored@Work on September 11, 2013, 07:28:40 pm

author: c4757p
author_rank: Super Contributor
timestamp: September 11, 2013, 09:24:31 pm
content: Well... do you have any other information on it? It's probably someone's custom part number, so it'd help to know what it came out of.You're probably not going to find anything, though. It will remain a UFT forever.

author: Experimentonomen
author_rank: Regular Contributor
timestamp: September 12, 2013, 07:21:26 am
content: cutom part numbers are usually when manufacturer dont want u to know they used cheap off the shelf parts like 2N3904/2N3906 and such, in order to charge you multiple times more for the replacement part and for the repair bill.

author: vk6zgo
author_rank: Super Contributor
timestamp: September 13, 2013, 04:46:38 am
content: What does it do?If what it does is critical,has rhe designer used the same part in another,but non-critical, position?If so,steal that one, put it in the critical spot,& replace it with a generic device.

author: Stonent
author_rank: Super Contributor
timestamp: September 13, 2013, 05:51:59 am
content: Is the board labeled?

author: Stonent
author_rank: Super Contributor
timestamp: September 13, 2013, 05:53:37 am
content: A google image search for 2100273k is well worth it.

author: BiOzZ
author_rank: Regular Contributor
timestamp: September 13, 2013, 07:14:01 am
content: also look up it as an SMD code i have ran across transistors like that beforebut chances are its a cheap chinese NPN without a datasheet but pin compatible with somthing else that you will never findgrab a transistor tester or make one or just toss it outif you need to replace it with something do a basic LED, resistor, 9v battery, momentary push button method of finding the B C E and replace it with an equivalent transistor and cross your fingers
ITS4142 failing in field, without any obvious reason - Page 1
Forum section: electronics / projects

author: CosteC
author_rank: Regular Contributor
timestamp: August 14, 2024, 10:17:26 am
content: Hello guysI got number of ITS4142 failing in field.Each is driving LED lamp (24V, 35 mA) on door of cabinet. There literally a meter of cable between lamps and unit, 24 V is stable, no other damage in this or other modules. No damage to cabling like cable cut by door, but ITS got holes burned in them (see photo)Sometimes 2 out 3 used, sometimes all 3. Failures happen months after installation.Any ideas?Datasheet:https://www.infineon.com/dgdl/Infineon-ITS4142N_20060309-DS-v01_01-en.pdf?fileId=db3a304412b407950112b4296b0840e1

author: BennoG
author_rank: Frequent Contributor
timestamp: August 16, 2024, 06:00:43 am
content: They could drive 1.5A so that would be no problem.Things come to mind:- Fake components.- Short circuit on the led.- Somehow a lot more current than the 35mA (it should be self protect)- Ringing- not enough decoupling to satisfy the internal charge pump.Benno

author: CosteC
author_rank: Regular Contributor
timestamp: August 16, 2024, 06:41:38 am
content: Quote from: BennoG on August 16, 2024, 06:00:43 amThank you Benno- Fake components hypothesis I investigate now, waiting for response from Infineon.- Shorted LED or more current seems fishy - LEDs work when module is replaced, cabling is not cut in visible way ( I cannot check myself, units are continent away)- Not enough decoupling is interesting. Indeed there is no good decoupling at those chips.- Ringing - I doubt it, cable to LEDs is maybe a meter long, ITS4142 is designed to drive relays and other inductive loads and it is rated for it. There shall be no PWM on those outputs too. I do not see any overheating marks either. It looks like sudden explosion. Very puzzling.Do you have experience with poorly decoupled ITS4142 or similar?

author: RoGeorge
author_rank: Super Contributor
timestamp: August 16, 2024, 07:37:13 am
content: At a first look, they seem too close to each other. In general, capsules with a radiator tab rely on the PCB copper for heat dissipation. Use an infrared camera to measure the temperature of each chip during the worst working regime, inside its enclosure and at the highest expected room temperature.Apart from that, I would also look for very high frequency oscillations, or if the absolute maximums request of the datasheet are obeyed at all time, including during transient regimes. Even when the schematic is correct, a bad layout of the PCB traces might make a stable circuit unstable.It's hard to identify the reason without schematic + PCB layout + mechanical enclosure.

author: CosteC
author_rank: Regular Contributor
timestamp: August 16, 2024, 01:36:35 pm
content: Normal load current is around 35 mA at 24 V - far from absolute nominal ratings.I am sure decoupling is insufficient and there is insufficient reverse polarity protection - no resistance in GND terminal. On other hand reversing power require swapping two cables with screwdriver and polarity is correctly marked on enclosure.
I/V Circuit help - Page 1
Forum section: electronics / projects

author: Kopernic
author_rank: Newbie
timestamp: October 09, 2013, 11:43:32 pm
content: Hello,I'm currently designing a DAC output I/V and filter. I thought I'd run a quick search around the Internet to find some circuit that does it. Ifound thisand thought I understood it, until I changed something and it didn't behave as I thought it would!I would like your help in understanding this circuit so that I can adapt it tothe DAC chipI'm using.Amazing ASCII Schematic (I had so much fun):Code:VCC --------+--------+---------\| | |R4 - R3 - D2 \ /| | | | -- - || | || >| | ____| PNP Q4 |--------+----|____|-|GND| /| R5+---\ | C1| | +------||-+----------->> OUT(V)| | | | TO FILTERS\| | |/ -NPN Q1 |--+---| Q2 | | R1<| |> NPN -| | |- | _GND | GND|IN(I) >>-----------+FROM DAC |\| ____Q3 NPN |--------+----|____|-|GND<| | R6| |R2 - || | D1 \ /- -| |VEE -----------------+---------/Transistor C |/ \| C------------- B -| |- B ------------NPN E |> >| E PNPVCC = +18v | R1 = 2.49k | R4 = 12.4k | D1 = RED LED | Q2 = 2SC2240 | C1 = 100uFGND = 0 | R2 = 249 | R5 = 12.4k | D2 = RED LED | Q3 = 2SC2240VEE = -18v | R3 = 249 | R6 = 12.4k | Q1 = 2SC2240 | Q4 = 2SA970Here's what I thought:R3, D2, R4, Q4 form a current source/sinkR2, D1, R6, Q3 form a current source/sink alsoR1 is the current to voltage resistorR4, Q1, Q2 is a current mirrorC1 is DC blockingNow the DAC specifies thatat Digital 0, the output will have a current of –6.2mA, atfull scale positive -2.3mAandfull scale negative -10.1mA; that's7.8mA of swing! So the circuit needs to move this current into R1. Now the data sheet says nothing about the impedance of the output, but most of the discussion around that chip seem to say get as low as possible.Here's how I understand it: The input of the DAC will "steal" current from the 2 CCS, which would otherwise be in equilibrium by the current mirror, an error voltage will "appear" between Q2 and Q4. Is that right ?How can I calculate the impedance that the DAC's output will "see" ?Thanks

author: Harvs
author_rank: Super Contributor
timestamp: October 09, 2013, 11:52:07 pm
content: You could just use the circuit they suggest at fig 37 in the datasheet. Seems a lot more straight forward to me, a couple of op-amps and you're set.

author: Kopernic
author_rank: Newbie
timestamp: October 09, 2013, 11:55:08 pm
content: Quote from: Harvs on October 09, 2013, 11:52:07 pmWhere's the fun in that ?

author: Harvs
author_rank: Super Contributor
timestamp: October 10, 2013, 12:12:43 am
content: Very true, except you know it's going to work pretty well.As far as impedance goes, when interfacing any current based device (be it a sensor or whatever) ideally the you want the input impedance to be zero. And the opposite goes when interfacing a voltage mode device, infinite input impedance. If you have a look in the datasheet, that's exactly what their example circuit does. The DAC output faces the inverting input of a opamp in a classic inverting configuration, which will hold the input at ground potential. This is done in a differential fashion with two opamps then the outputs a summed in the second stage.
IV testing of electronic components - Page 1
Forum section: electronics / projects

author: dren
author_rank: Newbie
timestamp: June 12, 2014, 07:36:57 pm
content: Hello,I am a mechanical engineer working in packaging of electronics and as part of my project I have to do IV characteristics test on electronic components and compare them with the charts given in the datasheet. The purpose is to see if the interconnection ( wire bonds) are intact or broken.I am not sure how to go about doing this, would be very helpful if someone can give me leads on this topic.Thank you

author: jpb
author_rank: Super Contributor
timestamp: June 12, 2014, 08:26:27 pm
content: You've started two threads with the same post - somewhat confusing - perhaps you should delete this one.

author: Stray Electron
author_rank: Super Contributor
timestamp: June 17, 2014, 04:35:33 pm
content: Huntronhttp://www.huntron.com/makes equipment for I-V testing and I think that on the higher end ones, you can define the parameters for Go vs No Go testing. Take a look at their stuff. Be prepared for sticker shock! They also have some decent application notes that should help you learn more about the subject.

author: jpb
author_rank: Super Contributor
timestamp: June 17, 2014, 05:04:15 pm
content: Quote from: Free Electron on June 17, 2014, 04:35:33 pmSlightly confusing having two "free electron" on the forums (free_electron and Free Electron to be precise).
Iv'e been busy the last 6 months this is the results.  - Page 1
Forum section: electronics / projects

author: diyaudio
author_rank: Frequent Contributor
timestamp: August 23, 2018, 07:18:48 pm
content: The last seven months has been really busy and hectic, short answer I've been building this... after months of white-boarding, designing a pcb, designing firmware, working with Azure IoT, testing, testing testing testing oh and more testing...Wallah an IoT Node planning on running Zephyr core MCU STM32L162 with interchangeable communication radio.Any criticism on layout welcomed.Enjoy
j diddy 5 transistor esr meter smd version - Page 1
Forum section: electronics / projects

author: pete g
author_rank: Regular Contributor
timestamp: February 08, 2018, 07:43:51 pm
content: o.k. so I made another esr meter. referring to the jdiddy meter/ i'am trying the figure out what r24 should be. i'am using a 50ua hope sun pm2 meter. the meter has a resistance of 2k ohms. using the formula total res =meter res+ r24+(pot res) divided by 2, I come up with 500ohms for r24. is this correct?

author: Cliff Matthews
author_rank: Unknown
timestamp: February 08, 2018, 08:06:58 pm
content: Nice, well post a photo or 2 or 3...

author: pete g
author_rank: Regular Contributor
timestamp: February 08, 2018, 11:44:27 pm
content: oops, total resistance is 7500ohms. jay diddy says r24 is 12k, Rupert, says 2k?

author: pete g
author_rank: Regular Contributor
timestamp: February 09, 2018, 02:53:37 am
content: hi cliff, I didn't box it yet, when I do i'll post pixs.
J1772 Charging Control Board? - Page 1
Forum section: electronics / projects

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: November 22, 2016, 04:24:28 am
content: I have purchased a UL listed J1722 charging lead, but I have no "brainbox"I've seen an arduino based controller, so I bought the parts, made the circuit, and went to program it... And it won't compile. Nice.Then I found a website selling a controller for... 200 bucks??? Nice.From what I can see, its really just a square wave signal and a couple passives and semiconductors. But why is it so hard and expensive to get the darn controller made? Do any of you EV owners with a J1772 port have an easy way to get the silly thing to charge?
Jack sockets - Surface mount + panel mount - Page 1
Forum section: electronics / projects

author: ubbut
author_rank: Regular Contributor
timestamp: September 04, 2018, 03:46:46 pm
content: For A project I could really use right angle 3.5mm SMD jack sockets which are also panel mount. Basically a surface mount version of these:https://media.rs-online.com/t_large/F5130421-01.jpgFor some reason the two options seem to be exclusive. Is there any obvious reason why these don't exist? Maybe some mounting issues?Thanks

author: Gribo
author_rank: Frequent Contributor
timestamp: September 04, 2018, 04:39:41 pm
content: Mechanical stress from the panel will be coupled to the SMD pads, tearing them out.

author: ubbut
author_rank: Regular Contributor
timestamp: September 04, 2018, 06:13:13 pm
content: Yes, but isn't mechanical stress even more a problem for SMD sockets which are not mounted in the panel? In my experience stress on the connector destroys SMD sockets quite quickly...I was going to counteract by having a panel mounted socket. However for manufacturing and space related reasons, SMD parts would be better than THT

author: Geoff_S
author_rank: Regular Contributor
timestamp: September 05, 2018, 11:55:52 am
content: CUI have surface mount versions. I've used them, but never put them under much mechanical stress. They have little plastic mounting pins which you could probably glue in if you were worried.https://www.cui.com/catalog/interconnect/audio-connectors/jacks/3.5-mm-jacks

author: ubbut
author_rank: Regular Contributor
timestamp: September 05, 2018, 12:06:34 pm
content: Quote from: Geoff_S on September 05, 2018, 11:55:52 amLooked at all their SMD sockets,but could not find one that is also panel mount. Do you have a link to a specific part? thanks
Jaguar X300 electric window bulb - Page 1
Forum section: electronics / projects

author: spencerikin
author_rank: Newbie
timestamp: May 23, 2012, 12:01:51 pm
content: Hi AllJust wondering if anyone knows where I can this bulb from. See attached photo showing the bulb in it's holder and the bulb on it's own. You'll notice that I broke off one of the tails where removing it from its holder. Its about 4mm in diameter.I really hope someone can help cause Jag don't sell the bulb, it only comes as part of the switch (very expensive), Maplin doesn't stock it and my local car parts places don't stock it either.Look forward to your help.Spencer

author: IanB
author_rank: Super Contributor
timestamp: May 23, 2012, 02:09:56 pm
content: A ruler in the picture would be helpful for scale. Is it a tiny bulb? It looks small to me.

author: Zad
author_rank: Super Contributor
timestamp: May 23, 2012, 06:13:08 pm
content: I'm surprised Maplin and local car shops don't:http://www.maplin.co.uk/wire-endedfilament-type-1954http://www.rapidonline.com/Electronic-Components/T1-Wire-ended-filament-lamps-29267http://www.ebay.co.uk/sch/i.html?_nkw=wire+ended+filament+lampshttp://www.esr.co.uk/electronics/lamps-wire.htm

author: RCMR
author_rank: Frequent Contributor
timestamp: May 24, 2012, 12:19:54 am
content: A decent output white LED with current-limiting resistor on one leg might do the job at a lower price and with greater reliability.
Janky low-cost "full-range" active surround speaker project - Page 1
Forum section: electronics / projects

author: KhronX
author_rank: Frequent Contributor
timestamp: May 13, 2018, 12:10:10 pm
content: This took me the best parts of the last couple of afternoons, but i got it done.Nothing terribly "hi-fi", just some noise-makers to serve as "surround" speakers, and/or alternative monitors to check mixes onTechnically, they are full-range, but one must consider the circumstancesEither way, some construction details and nice big photos can be foundover onmy blog, for whoever's at all interested. I won't blame you if you're not, though
jay diddy b 5 transistor esr meter - Page 1
Forum section: electronics / projects

author: pete g
author_rank: Regular Contributor
timestamp: October 12, 2019, 01:42:19 am
content: hi all, just completed this project. the unit seems to be working fine. the problem i.am having is trying to scale the meter. can't make heads nor tails of the software for doing same? I'am using a bigger meter than the author. the size of the meter I'am using is classified as a 44C2 size meter. can anyone help?

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: October 12, 2019, 02:28:19 am
content: Pete G and the group,When I made the prototype meter I did not use any special software, I used Corel Draw. This is described in this message:https://www.eevblog.com/forum/projects/5-transistor-esr-meter-design/msg172136/#msg172136At some point I made a table of meter deflection versus ESR:I have 0 degrees as midscale, because that is how Corel works.I don't have any experience using 'meter' software.Regards,Jay_Diddy_B

author: pete g
author_rank: Regular Contributor
timestamp: October 12, 2019, 07:13:58 pm
content: hi j, what I did was take the meter picture you provided and scaled it down to fit my meter. I must have screwed up, because the scale doesn't line up with the resistor values. i'll try again. thanks.

author: pete g
author_rank: Regular Contributor
timestamp: October 14, 2019, 02:57:02 pm
content: hi j, finally got it right, working great. actually, thanks to the perseverance of my wife. bless her heart.

author: w2aew
author_rank: Super Contributor
timestamp: October 14, 2019, 11:54:15 pm
content: That's a really fun design - so much fun in fact, I made a video about it a few years ago:

author: pete g
author_rank: Regular Contributor
timestamp: October 15, 2019, 01:36:19 am
content: yes, it is a fun design. i'am amazed at how accurate and sensitive it is.

author: pete g
author_rank: Regular Contributor
timestamp: October 15, 2019, 01:37:33 am
content: I watched your video. great circuit explanation. thanks for sharing.
Jaycar's Analog Lab Bench voltmeter QP5040 - Page 1
Forum section: electronics / projects

author: peteb2
author_rank: Regular Contributor
timestamp: June 16, 2019, 07:30:18 pm
content: Has anyone some data on the actual movement please, i.e. the FSD current spec and dimensions? I've an upcoming 'mad scientist' style piece of kit to build as a prop that needs to be operational...( joys of back engineering something). Jaycar's online catalog shows virtually no data about the actual meter, not even a set of rough dimensions giving an idea if its a tiny wee thing or what.Any info appreciated...

author: Kleinstein
author_rank: Super Contributor
timestamp: June 16, 2019, 07:55:38 pm
content: 15 V at 15 K impedance means this is a 1 mA full scale meter. So pretty low impedance.For the dimensions, the 4 mm terminals should give a hint. So it's quite large. A crude estimate by eye from the picture is some 100 mm square for the movement.

author: floobydust
author_rank: Super Contributor
timestamp: June 17, 2019, 02:07:51 am
content: It's oddball because the meter's zero is at 1/4 scale. You might be able to move it back with the zero adj. screw.sanwai J0408 panel meter and two resistors, inside.3V FSD the meter coil is 100R and 2k9 resistor, for 3k total and 1mA gives 75% deflection.15V FSD 100R meter and 12k (between 3V-15V jack) plus the 3V resistor for 15k total.I can't remember all the DIN 16257 symbols on the panel meter faceplate:Horseshoe = DC (no rectifier diodes inside)< = inclined mounting 60 degrees.star = ? I think it's classroom grade, not measurement grade.2.5 = accuracy class 2.5% of full-scale

author: peteb2
author_rank: Regular Contributor
timestamp: June 17, 2019, 02:34:56 am
content: That's fantastic info. Thanks so much. Yes, when i first clapped eyes on it in their online 'emailout' (it's currently at a sale price) i thought perfect... but then i saw the rather unusual zero=1/4 scale and thought oh dear (but maybe it could still be ok)....1mA 3/4 deflection & the tilt from vertical... hmmm off to do some thinking.Quote from: floobydust on June 17, 2019, 02:07:51 am

author: tautech
author_rank: Super Contributor
timestamp: June 17, 2019, 04:29:35 am
content: Pete, I have 3 similar simple bench moving coil meter here if you want any, they range from 80 to 100mm movements.
JBC 3-Tool Selector (DIY 3 handles on one JBC station) - Page 1
Forum section: electronics / projects

author: Lajt
author_rank: Newbie
timestamp: February 09, 2024, 10:05:50 pm
content: There are similar projects and solutions available online, both as DIY solutions and finished products.However, I wanted to share mine in hope that it might inspire some creative ideas within the community.Whole thing is simple. A box of relays that does what needs to be done for a JBC soldering station to use a tool that you need in that moment.It combines IMHO three most useful JBC handles. T245 (general purpose), NT115A (SMD handle), and AN115A (SMD tweezers).Why did I chose this option instead something else?Lack of work space. My creative area is 2m2(21.5 sq ft) leaving no room on my desk for more than one soldering station.This was the most compact solution I came up with at that moment.It was a quick and dirty project made to look good from the outside, but it works flawlessly for almost two years now.Only thing I regret is that it took me this long to document and publish the build.You can find more details on:https://lajtronix.eu/2024/02/08/jbc-3-tool-selector/Best regards, Lajt
JBC BT-2BQA soldering station sleep mode trigger?! - Page 1
Forum section: electronics / projects

author: Neshco
author_rank: Contributor
timestamp: December 13, 2024, 07:43:38 pm
content: I havethis stationand because of its position on the bench, and because the iron holder is permanently attached to the base, I boughtthis holderfrom Aliexpress to bypass the problem.But, it turn out that sleep function when rest in it does not work.I have tried to approach to the ring of the iron with strong magnet to try to trigger it, then I tried to approach it with some metal (I dont have anything ring-like to stick the iron in it) but nothing worked so far.How this station trigger the sleep mode?

author: Krotow
author_rank: Regular Contributor
timestamp: December 13, 2024, 08:21:29 pm
content: Look like my AiXun T3A. Sleep mode triggers by electric contact with metallic ring around tip end of handle. Yours have metal cylinder with concentric rings here. Don't mistake, it isn't the ground, but a part of "switch". The holder opening must be connected with a single banana socket a back of station. I see the appropriate sockets at back site of that Ali Mechanic holder (nice one BTW) too. Try connect your holder to the station with a wire and banana plugs.Also try to find out are the socket behind your station is the switch entry and not a ground socket. So most likely you must open your station at first to be sure.

author: Neshco
author_rank: Contributor
timestamp: December 13, 2024, 08:52:56 pm
content: Thank you!Just tested, bypassed the case of the holder and metal part on the station where the iron rest and it worked just fine.I have checked continuity between the esd!? connector behind the station and the iron rest and there is no connection. So, yes, as you said, the metal of the rest is the part of the switch. Problem solved
jbc c210 cartridge in ts80/p - Page 1
Forum section: electronics / projects

author: coldfire0101
author_rank: Newbie
timestamp: February 12, 2023, 04:18:05 pm
content: i have a spare ts80, also have ts80p and spare c210 cartridge. is there anyway to run that cartridge from the ts80. obviously i cant just put the c210 into ts80, but could the ts80 be used as like base station???
JBC C245 DIY Controler concept - Page 1
Forum section: electronics / projects

author: Bgdn
author_rank: Contributor
timestamp: January 12, 2023, 06:47:12 pm
content: Hello everyone,i know there are alot of projects out there for driving jbc tips.I came across some AD7793 and ADuCM360 chips which have 24bit adc's inside, and the necesary analog frontend ( gains, inamps..filters...)The ADuCM seems pretty tempting since it has all the resources on a single chip. But my concern is reading the thermocouple area.I have drawn a rough concept in the picture attached.The design uses dc voltage trough pwm controled mosfet.The temperature will be read when the pwm is off.My main concern right now is wether to use a galvanic isolated adc block for reading the thermocouple, or is the concept from the picture viable?I know the red wire from the tip holder is the thermocouple positive terminal, while the green is the negative.I also want to implement a current monitor feature using a small shunt resistor.What do you think?
JBC C245/C210 handpiece connector - Page 1
Forum section: electronics / projects

author: mcinque
author_rank: Unknown
timestamp: October 22, 2022, 07:21:03 pm
content: I would like to build an extension cable for the JBC soldering station.Anyone knows what's the connector used by this station/handpiece?I would like to order it from a "reliable" seller since it must handle some current, I don't want to risk overheating and ruin the original panel connector due to a bad connection.

author: DavidAlfa
author_rank: Super Contributor
timestamp: October 22, 2022, 07:27:51 pm
content: Not wanting to be rude, but first Google result on searching "jbc handle connector type" shows it

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 22, 2022, 07:48:42 pm
content: It's a Hirose RPC1-12P-6S(72).Had absolutely no problem buying those a couple years ago. Good luck finding them right now though. As with pretty much everything else.

author: mcinque
author_rank: Unknown
timestamp: October 22, 2022, 07:50:36 pm
content: thanks a lot! and let's hope for the best

author: hubi
author_rank: Regular Contributor
timestamp: October 22, 2022, 08:07:19 pm
content: Quote from: SiliconWizard on October 22, 2022, 07:48:42 pmI recently looked for this connector and found out that it will be discontinued next year. See the hirose websitehttps://www.hirose.com/product/p/CL0113-0001-8-72

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 22, 2022, 08:37:38 pm
content: Yes, I guess JBC is working on replacing it for the new generation.

author: mcinque
author_rank: Unknown
timestamp: October 22, 2022, 09:23:27 pm
content: hmm... so it could mean that spare handpieces for stations will be become difficult to find?

author: tooki
author_rank: Super Contributor
timestamp: October 23, 2022, 11:20:24 am
content: Quote from: mcinque on October 22, 2022, 09:23:27 pmProbably not. They’ll either keep making them for JBC as a “custom” part, or JBC has found another supplier, or JBC will simply buy a massive amount to keep them supplied for years and years.
jbc controller - Page 1
Forum section: electronics / projects

author: sony85
author_rank: Newbie
timestamp: February 09, 2024, 11:29:57 pm
content: hello i got an jbc controller. xpg controller but i can't make it work.i am follow the instruction and all diagrams but unsuccessful. i am getting extreamly hot tip and message no tool found. Can sameone help me with it . i am trying to make it work with c210 jbc .thanks

author: sw_guy
author_rank: Regular Contributor
timestamp: February 10, 2024, 05:47:23 pm
content: Have you wired the connector for C245 and you're using C210?

author: sony85
author_rank: Newbie
timestamp: February 10, 2024, 08:42:50 pm
content: not i wired for c210
Jbc DI-D2 2x tool switch - Page 1
Forum section: electronics / projects

author: akassa111
author_rank: Newbie
timestamp: May 26, 2023, 08:33:57 pm
content: Hey, I'm looking for a switch scheme, maybe it's possible to make a switch between 2 tools tweezers and c245 so as not to put the cable between the 2 stand when i want to change the tool

author: thm_w
author_rank: Super Contributor
timestamp: May 26, 2023, 10:24:27 pm
content: https://www.eevblog.com/forum/reviews/advice-on-recovering-form-a-soldering-station-miss-choice-palm/25/
JBC HT420 tweezers stand schematics request - Page 1
Forum section: electronics / projects

author: nikifena
author_rank: Regular Contributor
timestamp: June 23, 2024, 09:25:44 pm
content: Hi there. I have HT420 tweezers, but I don't have the original stand.Can anyone provide me with the schematics for this stand? Even some photos on the PCB in the stand will greatly help me.The stand model is HTSThanks in advance.

author: nikifena
author_rank: Regular Contributor
timestamp: August 09, 2024, 08:20:58 am
content: I got this from JBC, but they don't share the schematics or even a photo of the boardDoes anyone have HT420 and the stand? A few photos will do the job.Thanks

author: johnbaker26
author_rank: Contributor
timestamp: September 07, 2024, 03:12:38 am
content: Did you ever get anywhere with this? I am in the same situation as you without the stand. Those are two resistors and two diodes in the JBC photos right? Since they give the values all we need to know is where they go.

author: nikifena
author_rank: Regular Contributor
timestamp: September 07, 2024, 08:50:37 am
content: Yes. I found a solution.Just reverse engineered the station port, and now my tweezers work with my station.I will prepare the solution next week since we are on vacation now.

author: johnbaker26
author_rank: Contributor
timestamp: September 07, 2024, 10:05:07 am
content: Ok great thanks. Im assuming I'll need to order these diodes and resistors in the meantime?
JBC iron handle splitter  - Page 1
Forum section: electronics / projects

author: wernus
author_rank: Newbie
timestamp: January 21, 2015, 08:05:39 am
content: Hi guys,Would it be possible to connect two iron handles to CD-2BB station? I am using T245-A and T210-A handles alternately and switching cables drive me crazy. Maybe one of You already designed some kind of switch or splitter for this great station??
JBC JTSE-2A software problem - Page 1
Forum section: electronics / projects

author: MajorWilko
author_rank: Newbie
timestamp: August 13, 2017, 11:46:29 am
content: Hi, I'm hoping someone can help me pleaseI bought a JBC JTSE-2A Hotair Station and when I switched it in it wanted to do an update, I put the file on the USB and the update started then about 75% of the way through it just hung and never completed.I removed the USB and the screen went black and now it will not do anything at all. When I switch it on, the screen flashes white for a second then it just goes black. Is there anyway to get the software running on it again as I've tried most things and nothing is working?Many thanks for any info given
JBC Micro vs Nano Tweezers - Page 1
Forum section: electronics / projects

author: sobakava
author_rank: Contributor
timestamp: March 23, 2023, 03:36:43 pm
content: Hello,I was looking at AN115-A Adjustable nano tweezers to buy. Then I saw a deal on PA120 "micro" tweezers.I couldn't find a comparison. I understand that AN115-A uses C115 cartridges and PA120 uses C120 cartridges.I mostly do 0402 but sometimes 0201 too. I would say%60 0402%20 0201%20 0603-0805Is AN115-A too small for 0805, 1206?I couldn't find size and side by side comparison of these tweezer handles.Thanks

author: thm_w
author_rank: Super Contributor
timestamp: March 24, 2023, 12:01:04 am
content: I asked to move to the correct forum (equipment).https://www.jbctools.com/an115-a-adjustable-nano-tweezers-product-1488.htmlhttps://www.jbctools.com/pa120-a-micro-tweezers-product-49.htmlYou can see in their tip manual:https://www.buerklin.com/Buerklin-Webshop-Site/rest;loc=de_DE/attachments/Buerklin-Webshop%253A%252FFiles_294%252FTDS-JBC-JBC-EN-1592384604408.pdfThey tell you what tips will work with 0805, 1206, etc.AN115 is capable of 14W, PA120 is 40W. So that might be the limiting factor on larger components, without a preheater.
JBC soldering iron tip cleaner - Page 1
Forum section: electronics / projects

author: gaminn
author_rank: Frequent Contributor
timestamp: June 09, 2020, 08:00:12 am
content: Hi,I purchased this tip cleaner:https://www.jbctools.com/clmu-pa-universal-tip-cleaner-non-metal-brushes-product-1476.htmlIt cleans soldering iron tips very well but there are other problems with it:1) It chaotically turns on/off when there is stationary object in the far field of view of the device (please see my video here:http://mysharegadget.com/554671997)2) My tip cleaner is quite noisy. You can watch e.g. this videoand see that his tip cleaner is completely noise-less (the only difference is he has metal brushes, I have plastic brushes).3) The tip cleaner consumes 3 W in standby mode and I can see its proximity sensors are taking measurements in standby mode. Please see a picture attached. That's a minor problem but I just don't want to see that in a device that costs quite a lot of money...Is there any other owner of CLMU tip cleaner and can confirm or disprove his unit has the same issues?