hybridfree/eevblog-posts huggingface dataset:
8-32 size press-fit threaded inserts with thumbscrews PCB, how? - Page 1
Forum section: electronics / projects

author: onesixright
author_rank: Frequent Contributor
timestamp: September 16, 2015, 09:30:57 pm
content: Hiya All,On the evilmadscientist.com website, they have some DIITS. Now interestingly some of their PCB's have "8-32 size press-fit threaded inserts", straight into the PCBLooks pretty awesome, anybody know how to do this? See pictures, link to the original is below.http://shop.evilmadscientist.com/productsmenu/782#

author: bobcat
author_rank: Regular Contributor
timestamp: September 16, 2015, 10:05:12 pm
content: Look for PEM nuts.

author: Fank1
author_rank: Regular Contributor
timestamp: September 16, 2015, 10:40:20 pm
content: Some times called "nutserts"

author: onesixright
author_rank: Frequent Contributor
timestamp: September 17, 2015, 08:07:18 am
content: Awesome, found it, thanks!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 17, 2015, 09:21:11 am
content: You can get solder-in and press-in types. I'd probably trust press more than solder, but I'd trust both more if they are mounted on the opposite side so the bolt is pulling the nut into the board, rather than off of it.Tim

author: onesixright
author_rank: Frequent Contributor
timestamp: September 25, 2015, 08:06:32 pm
content: Hi Tim,Thank for your comment. Do you need anything special (toolwise) for press-in?Thx!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 26, 2015, 01:42:38 am
content: At least a press, but dies may be preferable or required (especially if you'll be using them on sheetmetal too).Lots of assemblers have this as a capability so you'd only need to do it yourself if you're doing everything.Tim
8 Bit Breadboard Computer - Page 1
Forum section: electronics / projects

author: allanfort486
author_rank: Unknown
timestamp: June 07, 2017, 09:51:21 am
content: This is my version of Ben Eaters Brilliant video series on building an 8 Bit computer on a breadboard. I had a lot of fun building it and learned a lot. you can visit his website athttps://eater.net/8bit/

author: rstofer
author_rank: Super Contributor
timestamp: June 07, 2017, 01:46:53 pm
content: Very nice project!

author: grumpydoc
author_rank: Super Contributor
timestamp: June 07, 2017, 01:51:27 pm
content: That's alotof breadboard.Neat layout, very impressive.

author: damn_dirty_ape
author_rank: Contributor
timestamp: June 07, 2017, 03:36:27 pm
content: Looks cool, I was thinking about trying something like this. Is the yellow data bus? It looks like you tied the bundles, which I thought was for filtering power or something, but that doesn't make much sense.

author: matseng
author_rank: Frequent Contributor
timestamp: June 07, 2017, 03:45:15 pm
content: The yellows are the control signals from the microoperations/instruction sequencer ROM. I.E they turn on and off the required latches, buffers and other stuff for each type of decided instruction.The databus is the middle part that goes all the way from top to bottom.It's a really nice and extremely well documented project from Ben. Well worth spending a few hours watching his YouTube videos describing, building and sometimes debugging the build.

author: allanfort486
author_rank: Unknown
timestamp: June 07, 2017, 04:01:48 pm
content: Power is distributed down the centre bus strips to each breadboard. this is different to Ben's design. The yellow lines are the control signals which the EEproms Control.

author: allanfort486
author_rank: Unknown
timestamp: June 07, 2017, 04:20:03 pm
content: You should try it, Ben's video's are extremely easy to follow and it is all modular so you build each part separately. He is a brilliant teacher and each module is built in a sequence that helps you understand how this thing works.

author: GerardWassink
author_rank: Contributor
timestamp: July 24, 2017, 11:44:17 am
content: I like the way you distributed power, Clock and the inverted Clock!I built this contraption as well, and in my rebuild I'm going to nick this idea from you, thanks!Gerard
8 bit or higher 4 function ttl coffee table calculator - Page 1
Forum section: electronics / projects

author: Sizigi
author_rank: Newbie
timestamp: April 19, 2014, 12:00:18 pm
content: Ok so I have had this project in mind for a few years now as well as many many many others. It is in short a really crappy slow calculator that has only 4 function add subbtract multiply and divide put in to a coffee table that then has a pane of glass over it all. The cool thing about it in my mind is that it is all ttl logic none of this microcontroller cheating or single chip solution. I want it to be bare bones and the best part is that it has a really slow clock speed and the aim is to have heaps of red and green leds on the circuit so you can se the calculator actually doing all of the opperations the flow would be something like this-Input first value using matrix gold leaf keypad this will display on a 7seg display unit for input 1-Select function with function keys +×÷--Input value using matrix gold leaf keypad this will display on a 7seg display unit for input 2-Load input 1 to system doing so will convert it in to a binary number and this will be shown with leds-load function-load input 2, converts to binary as with input 1-press run or execute key-adjust a dial to incresse or decrese clock speed maybe?-Watch in awe as the problem is run through the system and you see all the leds show the paths the digital logic goes-At the other end of the coffee table there is the output display by defult it will be in binary but at the push of an = or convert key ot will show up in base 10 on 7 seg displays........ I like 7 seg displaysI don't want to do pcb printing for it I think it will have a higher level of awesomeness doing it in vero board with jumper wires to ic sockets if it posiable to get a design for a 8 bit 4 function calculator with negatives and decimal I'm sure me and my father would be able to do the alterations to the circuit maybe even go to a 16 bitMy dad does have heaps of 74 series logic chips from old computers that ill uses the main hurdle trying to get the calculator degsined dad did suggest finding a scematic on the net and then making it first in a circuit simulator i think there are a few free ones out there.Well anyway that is more or less my crazy plan hopefully it wasn't allto you.If you have any advice or sugestions for this that would be greatly appreciatedFrom Sizigi, in more or less the bottom of the world, Dunedin New Zealand.

author: amyk
author_rank: Super Contributor
timestamp: April 19, 2014, 12:11:52 pm
content: You might find this interesting:http://files.righto.com/calculator/sinclair_scientific_simulator.html
8-bit quasi-bidirectional I/O port Expander - Page 1
Forum section: electronics / projects

author: Red_Micro
author_rank: Regular Contributor
timestamp: February 27, 2021, 12:35:24 am
content: The schematic attached is from a very old device. It's using the microcontroller SAB 80535. According to the datasheet P5.7-P5.0 is an 8-bit quasi-bidirectional I/O port. There's a keyboard, a LCD and some outputs connected in parallel to this port. I would like to design an external/remote board to control this port so I can use the information coming in/out the port somewhere else. I was looking at this chipPCF8574which looks like I could connect it to the parallel port and send/receive information via I2C using another micro. Would this idea work? Any suggestions?

author: m k
author_rank: Super Contributor
timestamp: February 28, 2021, 06:39:32 pm
content: You need more than one.There are 17 pins and other half is 6+3.Even if you ignore interrupts that are still 6 address pins.
8 Channel RS-232 DI Card from Elektor? - Page 1
Forum section: electronics / projects

author: Chris56000
author_rank: Frequent Contributor
timestamp: June 07, 2018, 07:58:12 pm
content: Hi!Just a quickie one!What are the chances of getting the software for this project I was interested in?http://cdn.eleinfo.ir/el2000/Articles/E/e007020.pdfThe link at "members.xoom.com/robofreak/is long gone, & Wayback Machine can't find it either!Would it be possible to work out how to program the EPROM from the information left in the article, or did any Member archive this before it disappeared?Chris Williams

author: Andy Watson
author_rank: Super Contributor
timestamp: June 07, 2018, 09:13:35 pm
content: There's enough information in that article to be able to reconstruct the contents of the EPROM. It's not so much software but more of a map between the digital inputs and their appropriate ascii messages. However, since there are potentially 256 x 64 bytes to define I would do as the author did and write some code to produce the map.

author: ajb
author_rank: Super Contributor
timestamp: June 07, 2018, 09:23:37 pm
content: This is one of those neat projects that would be really hard to justify recreating in an age when you can get an arduino clone for $2 and make something far more flexible for similar or less effort.

author: james_s
author_rank: Super Contributor
timestamp: June 07, 2018, 10:51:40 pm
content: You could try to contact the author directly, I found several references to George Vastianos, it seems he's been active in robotics.http://www.seattlerobotics.org/encoder/200106/16csscnt.htmhttps://www.iit.demokritos.gr/people/vastianos-georgeI agree that it would probably make more sense to go with a more modern design but it is fun to build old projects like this and I'm sure the author would be pleased to see people still interested in one of his old creations.
8 pin SMT IC "f PA2HN" - Page 1
Forum section: electronics / projects

author: daveyk
author_rank: Frequent Contributor
timestamp: May 30, 2024, 10:54:08 pm
content: Trying to figure a strip of ICs or FETS that I have.I have attached a picture of the IC/FET.I've googled, duckducked for several hours - lol. No idea what I have.

author: Benta
author_rank: Super Contributor
timestamp: May 30, 2024, 10:59:53 pm
content: Well, it's a Fairchild (now onsemi) part, perhaps FDS8984.

author: amyk
author_rank: Super Contributor
timestamp: May 30, 2024, 11:24:12 pm
content: FDS8984

author: daveyk
author_rank: Frequent Contributor
timestamp: June 03, 2024, 04:21:12 pm
content: Thank you very much!! I am still not sure, why I have them - lol

author: daveyk
author_rank: Frequent Contributor
timestamp: June 03, 2024, 04:22:24 pm
content: Thank you very much!! I am still not sure, why I have them - lol
8-Pole DIN Plugs - Take Care - Page 1
Forum section: electronics / projects

author: German_EE
author_rank: Super Contributor
timestamp: December 25, 2019, 07:18:58 pm
content: If you have an appliance or a piece of test equipment that uses an eight-pin DIN socket then please take care before you order a plug to fit it. There are TWO types of eight-pin DIN with slightly different pin dimensions and they are not interchangeableThe following diagram may help:https://shop.technofix.uk/image/cache/catalog/product-pics/8-pin-din-compared-wm-900x800.jpgNow you can learn from my mistake, and if anyone wants 3 x 270 degree 8-pin plugs then let me know by PM and I'll put them in the mail to you.

author: i_am_fubar
author_rank: Regular Contributor
timestamp: December 26, 2019, 04:41:03 pm
content: Haha, yeaaaa. Got stung by that before. RS was not helpful with their 'people who bought this also bought these' help.

author: magic
author_rank: Super Contributor
timestamp: December 26, 2019, 05:34:27 pm
content: Same thing with 5 poles. Those used on Hakko clone stations are not standard DIN even though they look similar. They are available as "5 pin microphone connectors".

author: janoc
author_rank: Super Contributor
timestamp: December 26, 2019, 06:49:07 pm
content: Had no idea!Good to know!

author: Alti
author_rank: Frequent Contributor
timestamp: January 22, 2022, 11:07:49 am
content: Old topic, new finding.I would also like to add that Hakko T12 soldering stations (FX-950/FX-951/FX-203) use 270 degree DIN 8-pin versions. The Aliexpress handle Hakko clones for T12 tips, like FX-9501 handle with 8-pin connector, are NOT compatible, even though look similar. The problem is the center pin which on clones is located in between 9:00 and 3:00 pins. You can clearly see that on properDIN connector8-pin version a center pin is not at the very center of the shield.The solution is to either buy a proper 7-pin DIN connector or to cut out the center pin (for these handles a center pin is NC). Otherwise the connector is going to be misaligned and won't mate reliably.

author: tooki
author_rank: Super Contributor
timestamp: January 22, 2022, 01:30:01 pm
content: Quote from: German_EE on December 25, 2019, 07:18:58 pmThere are at least three styles of 3-pin, and at least two styles of 4, 7, and 8-pin DIN connectors.The dimensions of the pins are the same. It’s the positions of the pins that differs.
8 position selector switch to multimeter - Page 1
Forum section: electronics / projects

author: tru3533
author_rank: Regular Contributor
timestamp: August 16, 2021, 09:31:00 pm
content: Hi,I`m looking at a project where I need a function where the user select from 8 different signals.Signals to be measured are voltage up to 12VDC and ohm.Output is connected to a multimeterThe obvious solution is to use a 2 pole 8 position rotary selector switch, but not that elegantCan you help with a solution that is more useful, and not mechanical?

author: David Hess
author_rank: Super Contributor
timestamp: August 17, 2021, 02:52:52 am
content: What is wrong with an 8 position double pole switch?The obvious alternative is an 8 position switch and relays which might be better in some applications.Depending on the ohm measurements, semiconductor switches are possible but that is even more complicated than relays.

author: tru3533
author_rank: Regular Contributor
timestamp: August 17, 2021, 09:59:48 am
content: The biggest drawback is price.The best solution I have found so far ishttps://www.digikey.com/en/products/detail/grayhill-inc/51ST22-01-2-08N/7686275Switch + knob = $25Ideal price range would be $10Finding a 2 pole 8 position switch for pcb mount in that price range is not easy.I have a MCU on the board so miniature relay solution is possible, what would be the goto relay here?

author: Nusa
author_rank: Super Contributor
timestamp: August 17, 2021, 10:08:52 am
content: I don't think you're going to find or make a different solution that costs less than $25, not counting labor.

author: tru3533
author_rank: Regular Contributor
timestamp: August 17, 2021, 10:47:16 am
content: I was hoping I overlooked somethingIncluding the switch, maybe some common ground can simplify the solution?

author: tru3533
author_rank: Regular Contributor
timestamp: August 17, 2021, 12:01:43 pm
content: This discussion got me going.1 rotary switch 1 pole 8 positions = $2.301 knob2 relaysNow how to activate the relays when in position 7 or 8?

author: tru3533
author_rank: Regular Contributor
timestamp: August 17, 2021, 01:04:08 pm
content: OK, this is what I have for now.Reducing the switch to 1 pole 6 positionAdding 2 buttonsDo someone have a even simpler solution?

author: Nusa
author_rank: Super Contributor
timestamp: August 17, 2021, 04:23:52 pm
content: You're using a button and a relay and a 5V power supply to do the same thing a dpdt switch would do? Times two.

author: tru3533
author_rank: Regular Contributor
timestamp: August 17, 2021, 08:54:58 pm
content: You are so right NusaAnd the price dropped to $0.6 for each button. = $1.2+ caps for buttons +rotary switch $ 2.30Total $ 4 for complete solution
8-SOIC to 8-SOIC N adapter? - Page 1
Forum section: electronics / projects

author: tekati
author_rank: Contributor
timestamp: July 09, 2015, 02:16:54 pm
content: I need to replace some old TOP Pic processors with newer flash ones but the problem is all the newer flash ones are the 8-SOIC Narrow packages.Any ideas? Adapters? Hacks?

author: leblanc
author_rank: Regular Contributor
timestamp: July 13, 2015, 04:15:10 pm
content: It shouldn't be too difficult to just solder one side and just add tiny wires (see Dave's dead bug video) for the remaining pads.Alternatively, soic-8 has 50mil pitch, you could get two 1x4 50mil SMD headers, solder them on the soic-8, then solder your 8-soic narrow in the air (wouldn't really recommend this.... but it's an option).

author: Ian.M
author_rank: Super Contributor
timestamp: July 13, 2015, 04:30:25 pm
content: Ideally you'd use a double sided adapter PCB done on something like Kapton flatflex or thin FR4, with pads to match the wide SOIC footprint on the underside, plated castellated edges, and whatever topside footprint you need for the new chip.
8 solar panels datalogging - Page 1
Forum section: electronics / projects

author: Spikee
author_rank: Frequent Contributor
timestamp: January 28, 2013, 12:52:50 pm
content: For a school project i need to measure some stuff. I have a rotating platform that has 8 solar panels.It turns 15 degrees each time and i have to measure the voltage and current for each solar panel (a mini inverter for each panel).After a full rotation (360 degrees) it will rotate back to the start position. Now i need to find out how i can measure the voltage and current for each solar panel and interface it whit the pc.Requirements:- One temperature sensor (pt100/1000)- 8 times voltage measurement- 8 times current measurement- one digital input (a voltage pulse for every time it has turned 15 degrees)- one digital input (for the beginning position)- a way to display the wattage (volt * current) for each rotation (0 , 15 , 30 , 45 ... degrees) (labview)- Will be placed outside in a water proof enclosure- (extra) one output to drive a relay - to switch the motor on and offI have used datalogging before using excel etc but the customer wants it in an digital overview.I have experience with siemens plc but it will probably be to expensive for this application.Any help will be appreciated !gr. spikee

author: Spikee
author_rank: Frequent Contributor
timestamp: January 29, 2013, 08:22:21 am
content: I have looked at national instruments DAQ modules but it is a bit expensive for my assignment. I think a custom pcb and pc software will be the best solution.https://www.ni.com/compactdaq/stand-alone/Does any one have experience in this field ?I hope for some help!Gr. Spikee
802.3bt - High power ( 90W ) Power over ethernet standard.   Cable protection - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: March 02, 2018, 05:50:22 am
content: Hey folks, I'm very curiously following development of the high power POE systems. 90W over a hunk of UTP is a wonderfully useful solution for all sorts of things. I've been having a discusison with the folks at TI about how they achieve protection across four pairs of cable.there is only current sence in two of the four pairs, and two of the pairs are run in parrallel, yet they seem to claim that the circuit is protected. What have i missed.In this picture they say that both cables are protected. because it all flows via the two FETS ( the diagram does not show the currnet sence but it is there, its simplified )I have posed this situation where one pair is broken. and suggest there is no way for the system to know there is a broken pair based on cable currents alone.Heres the link to the TI forum, for some context.https://e2e.ti.com/support/power_management/power_interface/f/204/t/666870#pi320098=2Am i missing somethign.

author: jbb
author_rank: Super Contributor
timestamp: March 02, 2018, 06:02:19 am
content: Seems like a reasonable question.Possibly the answer is 'oops,' or maybe 'the expected temperature rise from overload has been determined to present an acceptable fire risk.'

author: mrpackethead
author_rank: Super Contributor
timestamp: March 02, 2018, 06:37:02 am
content: Quote from: jbb on March 02, 2018, 06:02:19 am1.8A through a 23 AWG cable is pushing your luck.

author: tszaboo
author_rank: Super Contributor
timestamp: March 02, 2018, 07:53:26 am
content: Probably it has the same answer to this question, as all Ethernet layer 0 related problems. No way to detect it, no way to avoid it, and it will just not work. I think you also broke a complete pair, not just 1 cable.

author: mrpackethead
author_rank: Super Contributor
timestamp: March 02, 2018, 07:56:23 am
content: Quote from: NANDBlog on March 02, 2018, 07:53:26 amone wire or one pair broken you still are pushign current down a path that has not enough copper.

author: tszaboo
author_rank: Super Contributor
timestamp: March 02, 2018, 08:00:44 am
content: Quote from: mrpackethead on March 02, 2018, 07:56:23 amCAT5 is rated to 0.6A.3x54Vx0.6A = 97W

author: David Hess
author_rank: Super Contributor
timestamp: March 02, 2018, 01:09:48 pm
content: If one pair if broken, then one current sense will indicate high current and one will indicate low current which can be considered a fault. On the hardware side, a window comparator could detect the current imbalance to indicate a fault.
8088 motherboard with extras - Page 1
Forum section: electronics / projects

author: Jbates
author_rank: Newbie
timestamp: April 22, 2019, 05:08:56 am
content: Motherboard with an 8088-2 processor, Seagate st-238 r hard drive, toshiba 256k floppy drive and the enhance 150 watt switchable power supply....needing a little help trying to figure out what these are worth. Please and thanks...getting pics attached as I take them
80s Brick Phone- With Blueooth! - Page 1
Forum section: electronics / projects

author: yanir
author_rank: Regular Contributor
timestamp: July 16, 2012, 05:55:01 pm
content: Hi everyone, I finished my latest project and launched it on kickstarter:http://www.kickstarter.com/projects/shisalabs/80s-retro-brick-bluetooth-handsetIt's a Bluetooth handset styled like an 80's Brick phone. Closely modeled after the Dynatac 8000x series by Motorola. I designed all of the circuit boards (one main board, display board, and usb charging board). I use a Bluetooth module to handle all of the Bluetooth connectivity and a microcontroller to control the 8 character 5x7 LED display and keypad input.The Keypad is backlit by an array of 8 leds and all the buttons work. You can place (and answer) calls directly from the handset.I worked with a mechanical design firm to take care of the 3d modeling and tooling drawings.Attached are some pictures of the 3d printed parts, unpainted, painted and assembled.Hope you like it, tell me what you think and if your interested thanks for your support!-Yanir
822 or 951? - Page 1
Forum section: electronics / projects

author: timelessbeing
author_rank: Frequent Contributor
timestamp: July 03, 2012, 10:35:09 pm
content: Hi guys. I need help identifying this transistor please. Also, what do the colour stripes signify?

author: muvideo
author_rank: Frequent Contributor
timestamp: July 03, 2012, 10:52:43 pm
content: TO92 package, could be ZTX951,PNP transistor, but it doesnt seem a flat zetex package,google also returns an obscure NTE951 15V 100mA regulator,did you try to check the terminals with a multimeter in diode test mode?Or using a transistor tester of you have one?Fabio.

author: timelessbeing
author_rank: Frequent Contributor
timestamp: July 03, 2012, 11:28:31 pm
content: Yes I just tested it, and the multimeter thinks it's an NPN with gain of 260.

author: T4P
author_rank: Super Contributor
timestamp: July 04, 2012, 03:28:14 am
content: It's a NatSemi(the old logo) part ...

author: codeboy2k
author_rank: Super Contributor
timestamp: July 04, 2012, 03:48:32 am
content: Quote from: DaveXRT on July 04, 2012, 03:28:14 amThis is their new logo.After the merger, TI seems hell bent on wiping the NatSemi brand off the planet.

author: T4P
author_rank: Super Contributor
timestamp: July 04, 2012, 09:01:02 am
content: TI really is ...First they did that 'TI Remembers Bob Pease' ... WTFAnyway, i still go for TI for their parts because they are the first one to come up with an part reference android appNXP came later then ST came only with opamps.

author: Rerouter
author_rank: Super Contributor
timestamp: July 04, 2012, 09:03:56 am
content: i believe the stripes where from internal component testing when the item was made, 2 bits of my test gear have the same, (even some tanatlums re-dipped with another colour)

author: amyk
author_rank: Super Contributor
timestamp: July 04, 2012, 09:28:22 am
content: 2SC951? That matches being TO-92 and NPN.Supposedly equivalent to NTE123AP.

author: timelessbeing
author_rank: Frequent Contributor
timestamp: July 04, 2012, 08:19:30 pm
content: National Semiconductor was a US company wasn't it? I thought 2SC is a Japanese naming convention.

author: T4P
author_rank: Super Contributor
timestamp: July 05, 2012, 02:04:32 am
content: Must have been ZTX951 then, it's gain is also around 300hFE max but it's a PNPIs it NPN or PNP?But then again judging by the age ... probably isn't even similar to the ZTX951

author: timelessbeing
author_rank: Frequent Contributor
timestamp: July 05, 2012, 08:51:47 pm
content: Quote from: timelessbeing on July 03, 2012, 11:28:31 pm
8255 question... - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: January 15, 2018, 12:35:35 am
content: In the datasheet:http://www.intersil.com/content/dam/Intersil/documents/82c5/82c55a.pdfit talks about direct bit set/reset ability. On page 6 it says "Any of the eight bits of Port C can be Set or Reset using a single Output instruction. This feature reduces software requirements in control-based applications."Can't a single output instruction already write the entire contents of Port C ? I get that this allows single bit access, but is the single bit access any more efficient than writing the entire port?

author: BradC
author_rank: Super Contributor
timestamp: January 15, 2018, 01:15:54 am
content: Quote from: alank2 on January 15, 2018, 12:35:35 amIt can be. Rather than a read/mask/write operation to flip a single bit in a byte and then having to write it out to the device.

author: alank2
author_rank: Super Contributor
timestamp: January 15, 2018, 02:03:14 am
content: But, if you know what the port is already set to, it would still be one out command to change the whole port C though, right?

author: BradC
author_rank: Super Contributor
timestamp: January 15, 2018, 03:21:30 am
content: Quote from: alank2 on January 15, 2018, 02:03:14 amYes, but with the commands in question it's also a single command to set or reset a bit. Without those, altering a single bit is effectively a r/m/w operation.You asked specifically about the efficiency of a single bit operation. Sure if you want to write the whole port you can do that too.

author: alank2
author_rank: Super Contributor
timestamp: January 15, 2018, 03:27:06 am
content: Thanks!
868MHz SRF Radio? - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: July 20, 2018, 12:11:14 pm
content: I have been looking at some hardware which was based on RFu 328 which has a 'SRF' radio.What exactly is a SRF radio? There seem to be references to "Ciseco" but this company seems to no longer existThe footprint looks like RFM12B... is SRF actually just a RFM12B? (The RFu 328 being a Atmel 328 and a radio module... a bit like an Arduino Uno configuration)Any SRF? clues?Thanks in advance

author: NivagSwerdna
author_rank: Super Contributor
timestamp: July 20, 2018, 12:18:47 pm
content: I found some more references to CC1110 and CC1111... so looks like it was an RF module based on TI CC1110 with custom firmware. Looks expen$ive and hence perhaps the reason they don't appear to exist anymore?
880nm 5mm  array - Page 1
Forum section: electronics / projects

author: stein09163
author_rank: Newbie
timestamp: February 15, 2021, 06:44:40 pm
content: hiI designed a small array. I'm using a 24V 4A AC/DC adapter as a power supply. The array is series parallel 16x4 and uses 64 880nm, 5mm, discrete LED's and 4 1/4W, 1 ohm resistors. I used a test light on the array and found that the brightness from one led to another was different. The positive end of the array is brighter then the negative end. What is causing the brightness to change.I thought maybe the voltage being supplied was to low so I changed the array using the same 24V adapter for power. The array is series parallel 12x4 with the same LED's but using 4 each 1/2W, 82 ohm resistors. I got the same results.Both times I used the series parallel wizard to design the arrays.What is causing the brightness problem?Rick

author: Benta
author_rank: Super Contributor
timestamp: February 15, 2021, 07:36:36 pm
content: Too little info, but 1 ohm is ridiculously low.Don't use wizards before you can do it with paper and pencil.Just to start: which LEDs? What's your target LED current? How exactly are they wired? I could go on.A picture (in this case a schematic) is worth 1000 words.

author: stein09163
author_rank: Newbie
timestamp: February 16, 2021, 06:52:53 pm
content: The led's are discrete led's......infared 880nm 5mm 75 mW 64 of them 16x4 series parallel.........source voltage 24 , Forward voltage 1.5, forward current 50 (mA), number of led's in array 64+ >->->->->->->->->->->->->->->-> - 1 ohm Resister+ >->->->->->->->->->->->->->->-> - 1 ohm resister24V + >->->->->->->->->->->->->->->-> - 1 ohm resister+ >->->->->->->->->->->->->->->-> - 1 ohm resister

author: Benta
author_rank: Super Contributor
timestamp: February 16, 2021, 07:15:31 pm
content: Quote from: stein09163 on February 16, 2021, 06:52:53 pmThis is your problem. The forward voltage istypically1.5 V, but can be 1.3...1.8 V, and you don't know which.The best solution would be shorter LED chains and constant-current sinks.

author: edavid
author_rank: Super Contributor
timestamp: February 16, 2021, 07:52:17 pm
content: "I used a test light on the array" - what does that mean?Most likely your brightness measurement was off somehow.
looking for an 8S LiIon charger IC - Page 1
Forum section: electronics / projects

author: TmaxElectronics
author_rank: Regular Contributor
timestamp: September 11, 2019, 09:44:31 am
content: Hello,I have a new battery powered studio light project, which at the moment uses a 4S LiIon battery pack with integrated USB C charging. However i now have plans for a version with more capacity and a more efficient boost circuit (instead of going from 15V to 50V i would go from 30V to 50V) for which i would need an 8S battery pack.I have already looked around for a suitable boost charger but was not able to find one. I did think about using the same IC as the LED driver, as it has an accurate voltage limit feature, but it does not have input current limit.Is there even an integrated solution for such a special case, or will i have to improvise something or potentially even ditch the integrated charger all together?

author: jonpaul
author_rank: Super Contributor
timestamp: September 11, 2019, 12:47:38 pm
content: Hello, no idea what you mean by 4S or 8S.Please be more specific the type, and capacity battery.Many dedicated IC s exist for battery charging.Do not use an LED drive, completely different.You do not mention the power source, 240v mains?Finally beware that lithium batteries are potentially dangerous and catch fire or even explode if improperly charged.There is a safety, compliance and liability issue in such a project especially if intended for volume manufacture.As the cinéma and still film portable lighting market is well developed, you should survive the available lights and battery packs and chargers already existing.Just the rambling of an old retired EE!Bon ChanceJon

author: martin1454
author_rank: Regular Contributor
timestamp: September 11, 2019, 01:03:14 pm
content: Quote from: jonpaul on September 11, 2019, 12:47:38 pm4S or 8S is 4/8 battery cells in series,so 4*3.7V and 8*3.7V

author: todd_fuller
author_rank: Contributor
timestamp: September 11, 2019, 03:26:38 pm
content: Not many out there that handle 8S standalone. LTC4162 is one.

author: TmaxElectronics
author_rank: Regular Contributor
timestamp: September 12, 2019, 08:01:02 pm
content: But the LTC4162 is only step down right?The usb would be able to supply a maximum of 20V, so i would need a boosting charger.I did however find the LT3796, a boost controller IC with CC and CV output modes and input current limit. It is however not intended for charging LiIon cells. Would it be possible to modify it to do that? I would expect the charge termination to be the most difficult thing.

author: jhpadjustable
author_rank: Frequent Contributor
timestamp: September 13, 2019, 10:33:35 am
content: Isn't charge termination exactly what the LT3796's ~VMODE pin does?

author: TmaxElectronics
author_rank: Regular Contributor
timestamp: September 16, 2019, 12:59:20 pm
content: Is that pin not just pulled low once the voltage reaches the set threshold? That would skip the CC part of the charge curve.
8x16 RGB LED Coffee Table - Page 1
Forum section: electronics / projects

author: bear24rw
author_rank: Newbie
timestamp: July 30, 2011, 01:24:09 am
content: All the interns at Texas Instruments were challenged to build projects based around a MSP430 microcontroller. My group made a 8x16 RGB LED Coffee Table!http://e2e.ti.com/group/msp430launchpad/m/project/447779.aspx

author: Simon
author_rank: Unknown
timestamp: July 30, 2011, 07:10:21 am
content: nah, the wholly analogue one is much cooler

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: July 30, 2011, 09:24:57 am
content: There are two fundamental problems with LED coffee tables.1) you don't want a mains lead to a table.2) Tables are for putting stuff on, covering up whatever the table is doing.

author: Simon
author_rank: Unknown
timestamp: July 30, 2011, 09:31:54 am
content: Quote from: mikeselectricstuff on July 30, 2011, 09:24:57 amthat is waht the analogue on is much more effective, it could be run on batteries for a good bit of time and does have the "resolution" that prevents you from putting stuff on it to appreciate it in fact doing so makes it work
8x8 RGB led matrix - Page 1
Forum section: electronics / projects

author: deisenberg
author_rank: Contributor
timestamp: April 25, 2013, 03:31:45 pm
content: EDIT:Must be smoking something the unit has 32 pins and I must have lost my brain last night when I was looking at it :/ Don't need help now.Ordered an 8x8 RGB led matrix from ebay and it only has 16 pins, it's common anode, but I can only get blue out of it. I am trying to figure out how to get the other colours. From what I gather from the very little information google provided I need to send a high, or low single to it to change colours, Is this correct? maybe it was a pulse Is it possible to do this with a bench psu? Any help or a pointer in the right direction would be great!Thanks!
9 or 10 inch capacitive touch screen for car dashboard - Page 1
Forum section: electronics / projects

author: xevious
author_rank: Newbie
timestamp: April 10, 2016, 09:26:24 pm
content: I'm trying to find a capacitive touch screen for use with either a Raspberry Pi 3 or Odroid C2 in a car computer project. I'd like it to be between 9 and 10 inches with a 4:3 aspect ratio. I've found several screens designed and marketed specifically for use with Raspberry Pi and other hobbyist boards like the Odroid line, but they all seem to have low resolution, very narrow viewing angles, or low brightness. I don't need super high resolution, but would prefer at least 1024x768 (and ideally more).The Chuwi Hi10 tablet has a screen that's just about what I want: 10.1 inches, 16:10 (not 4:3), capacitive multitouch, 1920x1200, IPS. I haven't been able to locate a similar screen on its own. Maybe I just don't know where to shop for touch screens? (I've been considering just using the Chuwi tablet instead of a raw touch screen and SBC like the RPi or Odroid, but I'm not sure how I'd get the GPIO that I need. Also, Linux on that tablet seems a little dodgy in terms of driver support.)Any suggestions for either specific models I should look at or better places to search for touch screens?
90 degree connector, higher density than JST 2.54 - Page 1
Forum section: electronics / projects

author: nuclearcat
author_rank: Unknown
timestamp: November 04, 2020, 06:24:51 am
content: I have edge of board with 90 degree connectors, right now several JST XH 2.54.They dont really fit well (problems with space for USB and reset button footprint), and i cannot go to more flimsy connectors.Is there anything same strong and easy (for users) as these JST? And sure not expensive.

author: ThomasDK
author_rank: Regular Contributor
timestamp: November 04, 2020, 07:07:34 am
content: JST PH

author: nuclearcat
author_rank: Unknown
timestamp: November 04, 2020, 07:30:07 am
content: Quote from: ThomasDK on November 04, 2020, 07:07:34 amFor now thats seems only option i have, just JST with smaller pitch.

author: langwadt
author_rank: Super Contributor
timestamp: November 04, 2020, 09:02:25 am
content: nano-fit ?

author: nuclearcat
author_rank: Unknown
timestamp: November 04, 2020, 10:07:16 pm
content: Quote from: langwadt on November 04, 2020, 09:02:25 amYes, they are the best, combination but availability, price, MOQ seems inappropriate for customer.I seems i will go with JST PH, its enough to win those few mm i need
90deg connector fod daughterboard - Page 1
Forum section: electronics / projects

author: nazardo
author_rank: Contributor
timestamp: November 09, 2015, 10:42:02 am
content: I need to put a pcb on top on another pcb, at the moment they are coplanar but I would like to redesign the board with perpendicular fit. I have the need of about 12-14 pins, low current. There are many edge or board-to-board connectors, but I need one that will also mechanically hold the pcb in place, so it has to have some mechanical locking feature.Any suggestion?Thanks
936 soldering station triac replacement - Page 1
Forum section: electronics / projects

author: angelothewolf
author_rank: Contributor
timestamp: October 16, 2013, 05:36:20 pm
content: hi everyone, im wondering if its possible to replace this BT137 with the MBR1545CT... thanks!http://www.nxp.com/documents/data_sheet/BT137_SERIES.pdfhttp://www.onsemi.com/pub_link/Collateral/MBR1535CT-D.PDF

author: wraper
author_rank: Unknown
timestamp: October 17, 2013, 10:18:55 am
content: You managed too find datasheets, did you try to look into them? MBR1545CT is 2 diodes, not triac
937D+ vs #3020-XTS vs TS100/SainSmart PRO 32 - Page 1
Forum section: electronics / projects

author: samocamo123
author_rank: Newbie
timestamp: February 22, 2017, 10:04:30 pm
content: As It says in the title, which iron should I get? I know most of you will probably tell me to get a used real hakko 936 or 888D but I don't want to spend that much and I don't really want a used iron. Right now I am leaning towards the TS100 but I hear the 937D+ is good and a few have recommended the #3020-XTS.937D+ :http://www.ebay.com/itm/937D-Iron-Soldering-Station-SMD-Desolder-Welder-Welding-w-Stand-Sponge-ESD-110V/331456787169?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D41376%26meid%3D4ba56a9ca15d4bdba827db84bdcdf386%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D311362357215TS100/Sainsmart Pro32:http://www.sainsmart.com/pro-32-digital-oled-programable-soldering-iron-station-embedded-interface-dc-5525.html#3020-XTS:https://www.amazon.com/X-Tronic-3020-XTS-Digital-Display-Soldering/dp/B01DGZFSNE/ref=sr_1_1?ie=UTF8&qid=1487800837&sr=8-1&keywords=x-tronic+model+3020-xts
95k9 resistor where does it fit - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: August 11, 2016, 12:02:40 pm
content: HelloThis 95k9 resistor is available from rs.http://bit.ly/2aIX0SxThis is not a typo. Search for 95k9 in the datasheet. It is there.http://bit.ly/2aIXmZaThere is also a value 1 decade lower 9.59khttp://bit.ly/2bjbzl5I cannot find this resistor in the Standard EIA Decade Resistor Values Table based on IEC 60063.http://www.logwell.com/tech/components/resistor_values.htmlMy suspicion is that this value must be for the E192 0.25% or 0.1% standard values. Although both resistors are specified as 1% which is E96 in which it is not .My question is. Where can I find the standard values in a decade for the E192 0.25% and 0.1% My assumption is that that all the E192 tables given is for 0.5%. Or does the tables have the same values for 0.25 and 0.1% in which case I do not know where a 95k9 or 9k59 resistor fits.here are more examples of tableshttps://www.bourns.com/pdfs/standard_decade_values_02.pdfhttp://www.resistorguide.com/resistor-values/This one say E192 0.5, 0.25 and 0.1 % all share the same tableThanks for illuminating me

author: Siwastaja
author_rank: Super Contributor
timestamp: August 11, 2016, 01:13:07 pm
content: Any manufacturer can - and in reality, do - manufacture any value resistors with any tolerances they want; they don'tneedto belong in any EIA group, although usually most resistors do.That being said, I can't answer why they manufacture this particular value with this particular tolerance, but apparently it makes some business sense.

author: azer
author_rank: Regular Contributor
timestamp: August 11, 2016, 09:56:58 pm
content: The value is according to the datasheet in their series in between 976 and 931 which are part of the E96 series.Since 953 is in the E96, it might be a datasheet error where the 3->9 or there is some manufacturing reason for it.

author: Kirr
author_rank: Regular Contributor
timestamp: August 12, 2016, 12:46:16 am
content: Quote from: Cicada on August 11, 2016, 12:02:40 pmThe 192 in "E192" is the number of values spanning a decade. That's why regardless of tolerance, the nominal values are the same.As you mention, manufacturers often use non-standard tolerance. For example, 1% E24 resistors are very popular. (E.g., seethis linkwhere they discuss this mystery).95k9 is about in the middle between 95k3 and 96k5, so it could be a part of a hypothetical E384 series. No one is manufacturing this whole series, but perhaps some values are beginning to appear.

author: amyk
author_rank: Super Contributor
timestamp: August 12, 2016, 01:00:51 am
content: 959 is right in the middle of two E192 values so it would be theoretically the "E384" series. All the odd values in this series (not in E192) are:Quoteand indeed you can find resistors of the other values in that list, like871,728,947, and994.That's not the most unusual values you can find though, here is (a rather expensive)635.359ohms resistor:http://www.digikey.com/product-detail/en/vishay-foil-resistors-division-of-vishay-precision-group/Y1751635R359U9L/Y1751635R359U9L-ND/4232671
96V output transformers. - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: January 26, 2021, 02:20:18 pm
content: HiFor cheap I can buy a very beefy (second hand) 220V to 96V transformer. I plan to use one as a safety isolation transformer together with a 2.5KVA variac that I have.Where (in what equipment) does one usually see these 96V output transformers?Inverters?Motordrives?and why 96V?Thanks

author: Ian.M
author_rank: Super Contributor
timestamp: January 26, 2021, 02:53:18 pm
content: That depends on the secondary configuration. Does it have a center tap? If so, possibly an audio power amp, otherwise probably old big DC motor drives.IMHO its not a good choice for an isolation transformer unless you can get two of them to use back to back, or if you use a single one backwards, if you add a mechanical stop to your Variac knob at 100V. Make sure your Variac output is fused (or has a circuit breaker) at the lower of its rated wiper current or the transformers rated secondary current.Personally, I'd choose to set it up with a beefy bridge rectifier and a decent sized bank of 160V rated electrolytic reservoir caps, for use as an isolated variable (but unreguated) DC supply with the Variac, for experimenting with largish motors, etc. N.B. the max. permissable continuous DC current is at most 62% of the secondary's RMS current rating.If its got a center tap, use 100V caps between the center tap and the bridge + and - terminals, for either symmetrical positive and negative rails suitable for audio power amps, or if you draw between bridge + and CT with no load on bridge -, DC at half the voltage and up to 100% of the secondary RMS current rating.

author: Pawelr98
author_rank: Regular Contributor
timestamp: January 26, 2021, 03:00:38 pm
content: If you already have a variac then just get a 100-120V/220-240V transformer and adjust the voltage as required.Also you don't even have to use one transformer.Get two transformers with 2x24V secondaries (those are plentiful and cheap) and connect them in phase.You will get those 96Vac this way.

author: jbb
author_rank: Super Contributor
timestamp: January 26, 2021, 07:22:34 pm
content: It’s a guess, but the 96V may be targeting a 120V DC output. This is used in some power substation control rooms (plus a big stack of lead acid backup batteries). Maybe also some industrial systems?96V AC is a bit odd, otherwise. Above Safety Extra Low Voltage, but still less than the typical 120V / 240V line voltage...
96x96 RGB LED panel. Anyone ever seen a datasheet for these units please? - Page 1
Forum section: electronics / projects

author: peteb2
author_rank: Regular Contributor
timestamp: November 17, 2022, 09:48:39 pm
content: These sorts of panels seem to be in use everywhere now, especially huge advertising hoardings. Has anyone ever seen a data sheet for this 'animal' please.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 17, 2022, 10:35:06 pm
content: can you give us the ic's markings

author: peteb2
author_rank: Regular Contributor
timestamp: November 18, 2022, 03:51:06 am
content: I read it as SCL NC 8060A9A2 E1514 R5T7Y. All searches haven't thrown up very much up, probably because it was never released for general use perhaps?

author: coromonadalix
author_rank: Super Contributor
timestamp: November 18, 2022, 12:58:58 pm
content: can you show us zoomed out pictures, is it an led display rgb leds wrgb leds ?? connectors ??Would be nice to have better views and yes it's an p2 led display i thinknormally driven by specialized controllers rgb inputs, clock, data ... sometimes driven by shift registers or have them on the pcb ..., hub 75 boards etc ...Search p2, p4, p5, p6, p10 led displays tiles like 16x16, 32x32, 64x64, etc .... sometimes you get some infos on the pinouts / protocolssome arduino codes, some raspi codes etc ...I think theses ic's are highly integrated led controllers ....
99% Junk made pen plotter - Page 1
Forum section: electronics / projects

author: carcanhol
author_rank: Regular Contributor
timestamp: December 28, 2014, 10:29:36 pm
content: Hi all, just a question, is there any "simple" stepper motor driver compatible with EMC2 that we can make at home or its best to buy an allready made one for projects like this one on the video?thanks.And happy new year.
9mm rotary encoders similar to alpha RV09 pots?  - Page 1
Forum section: electronics / projects

author: iampoor
author_rank: Frequent Contributor
timestamp: May 27, 2016, 01:48:56 am
content: HiIs anyone familiar with a rotary encoder that is similar to these alpha potentiometers?http://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/linear/1k-ohm-linear-taper-potentiometer-round-knurled-plastic-shaft-pcb-9mm.htmlI like how these small pots dont require a knob. Finding affordable, good looking, pointless knobs with a similar look, feel, and price to the ones I currently use on my products has been quite a pain!

author: chris_leyson
author_rank: Super Contributor
timestamp: May 27, 2016, 03:13:45 am
content: Try Tyco DP12 or DPL12 series.Chris

author: iampoor
author_rank: Frequent Contributor
timestamp: May 27, 2016, 07:07:57 pm
content: Quote from: chris_leyson on May 27, 2016, 03:13:45 amThanks, I will have a look at those.