hybridfree/eevblog-posts huggingface dataset:
Eaton Bussmann RTMR power distribution module availability - Page 1
Forum section: electronics / projects

author: r-mm
author_rank: Contributor
timestamp: February 12, 2022, 09:00:14 pm
content: I've been looking for Eaton Bussmann's RTMR fuse and relay panel for a long time. Waytek notifies me every time the mfgr pushes the delivery date back. Which is like clockwork every 3mos. At this point in the pandemic I'm familiar with delays and have had a number of suppliers tell me to simply not plan around a product. After waiting on this for almost a year I thought I'd post to see if anyone knows any more than Waytek about the supply chain issues. I have searched ebay and other non traditional sources but no luck, as the particular configuration I want (fuse input bussed, relays not bussed) is somewhat less common. I know there are other power distribution modules out there but this one really has everything I need any nothing more.ThanksRushttps://www.waytekwire.com/item/46345/?utm_source=cat233

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: February 18, 2022, 05:08:20 am
content: Assuming you are after 15305-5-2-4 from the link you gave? Yea not much stock of that one around, likewww.netcomponents.com(kinda like Octopart for hard to source components) only has a couple of suppliers with stock (Georlin Technology Limited with 3999pcs)

author: r-mm
author_rank: Contributor
timestamp: February 18, 2022, 11:21:32 pm
content: Thanks for the tip. I don't have a login to Netcomponents so I can't see the results. I searched Georlin for 15305-5-2-4 but nothing came up.http://georlin.tw/

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: February 18, 2022, 11:24:39 pm
content: Quote from: r-mm on February 18, 2022, 11:21:32 pmUsually you have to contact them directly for these sorts of thingshttp://georlin.tw/index.php?case=archive&act=list&catid=5

author: Renate
author_rank: Super Contributor
timestamp: February 19, 2022, 02:48:08 pm
content: That's a nice looking panel. I guess that you need the relays and the environmental.For just distribution with ST blade fuses I've used this:https://www.bluesea.com/products/5029/ST_Blade_Fuse_Block_-_12_Circuits_with_Cover

author: r-mm
author_rank: Contributor
timestamp: February 19, 2022, 04:18:30 pm
content: The RTMR is great, I used it on another car and want to use it here. The IP rating isn't crucial but the bussing and relays are. I'm also using a two-buss Bluesea for this project. What would be ideal would be something that can be internally bussed in any configuration, adjustable with jumpers or the like, not many many wires. When you jump up to the next level of complexity in PDMs you either get the wrong things (for my use) bussed or its OEM configurable but not for a one-off.
Eaton PowerWare 20 kVA UPS teardown - Page 1
Forum section: electronics / projects

author: madsbarnkob
author_rank: Frequent Contributor
timestamp: October 16, 2018, 06:20:58 am
content: Here is a little quick, dirty and early morning junk yard teardown of a 20 kVA Eaton PowerWare UPS system.I have earlier taken some of these systems apart and you can see the differences from there photo galleries:http://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2016_03_22_-_Eaton_Powerware_20kVA_UPShttp://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2016_03_22_-_Eaton_Powerware_30kVA_UPShttp://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2016_09_23_-_Eaton_Powerware_20kVA_UPSOther UPS teardown videos:http://kaizerpowerelectronics.dk/teardown/teardown-of-a-eaton-powerware-60kva-ups-system/http://kaizerpowerelectronics.dk/teardown/teardown-video-of-eaton-powerware-30-kva-ups/http://kaizerpowerelectronics.dk/electronics/teardown-eaton-powerware-30-kva-ups/http://kaizerpowerelectronics.dk/teardown/teardown-of-a-merlin-gerin-pulsar-esv-22-ups/
ebay 1kHz test signal for THD measurements - used with Keithley 2015 THD - Page 1
Forum section: electronics / projects

author: jpb
author_rank: Super Contributor
timestamp: July 06, 2014, 02:00:48 pm
content: I bought one of these 1kH signal sources as a result of macboy's post in another thread:Quote from: macboy on June 23, 2014, 12:50:11 pmThis isn't a review as I've only used it to test my Keithley 2015 THD so I can't say how low distortion it is, only give an upper limit.First, a couple of things about the board - one it doesn't have holes of mounting screws though it does have a single screw at the front to mount it in a case.Secondly it requires a rather awkward 35V power supply but it only draws 26mA as shown in the first photograph.My lash up is rather messy as shown in the second photograph but good enough for my tests. It is a two channel source so I used the second channel for scope output.The Keithley 2015 THD test procedure calls for a 0.95V rms signal at 1 kHz. Adjusting the pot to give the level is rather awkward as there is a delay in response and 0.94V was as close as I could get. The frequency is about 1Hz low (999Hz rather than 1kHz) but that seems good enough to me.The % THD test showed a reading that went between 000.000 and 000.001% well within the K2015 THD's spec of < 0.004%.The measurement in dB showed -99.5dB (though the decimal point figures move around). This is a measurement of the K2015's noise floor rather than the oscillator but shows it is at least as good as -99dB (the claim is less than -145dB but of course I can't measure this).(Edit : the spec for the 2015 is for a residual distortion of -87dB.)Anyway - as an oscillator to test a 2015THD it works very well and it might well work very well for more serious THD measurements.

author: jpb
author_rank: Super Contributor
timestamp: July 06, 2014, 02:02:11 pm
content: Here are the measurement results (didn't fit on the first post).Edit : I realised that I could have one extra digit of resolution on the measurements and have added two new shots, though they don't affect the results.

author: jpb
author_rank: Super Contributor
timestamp: July 06, 2014, 02:39:51 pm
content: Note to moderators - I meant to post this in the Test area but accidentally posted it under Projects - perhaps it should be moved (I don't think I can do this myself?)
Ebay 75mm Slide pots - Interesting Taper - Page 1
Forum section: electronics / projects

author: Buriedcode
author_rank: Super Contributor
timestamp: April 26, 2024, 04:37:17 pm
content: I was looking at slide pots for a prototype, so I bought up a few different models for sizing, to see which ones would fit in the enclosure I was going to use.Whilst there's generally 45mm travel and 60mm travel, aliexpress and ebay have lots of those 75mm ones (60mm travel, but slimmer), often stereo, that are quite low profile - like the bourns PTA6043 - and was a better fit than the larger ones like Taiwan Alpha RA6020FExamples of the cheap clones are here:https://www.amazon.co.uk/DollaTek-Potentiometer-Double-Linear-Electronic/dp/B081JNQ7MMI bought a pack of 5 from a random ebay seller, and one from a known "good" seller, that was mounted on a breakout board for use with Arduino/Rpi etc..They're the perfect size for my prototype, but the taper is odd. It seems to be a "W" taper, despite all being labeled as B103 - which is usually 10k linear. The value goes from 1k to 9k (10% to 90%) between 25 and 75% of travel, which to me at least, looks like a classic W taper used in graphic EQ's. As a quick and dirty test, I used an Arduino to read the wipers with the top and bottom hooked to 5V/GND, and roughly moved it 6mm at a time to get 9 readings, and reading both tracks.All 7 pots I have use this taper, which is annoying since it can't be used for linear control apps - even if I used a lookup table to correct its less than ideal. But it seems these are perfect for making graphic EQ's like the classic MXR 6 band EQ.So this is just a FYI post in case others wanted to use these for control inputs and got funky results.

author: strawberry
author_rank: Super Contributor
timestamp: April 26, 2024, 06:38:00 pm
content: they make interesting components but can spoil all fun with just one thingtin plated = silver platedsomething strange with China. everything must be unbelievably cheap and unbelievable low quality and must look like 1milion

author: electr_peter
author_rank: Unknown
timestamp: April 26, 2024, 10:07:36 pm
content: Linear pots are unusual in audio applications. Sliders intended to be used with motor control have two potentiometers inside - linear for position and non-linear for audio.
Ebay DDS function Gen problem - Page 1
Forum section: electronics / projects

author: Deathwish
author_rank: Unknown
timestamp: August 02, 2015, 08:35:42 pm
content: Ok.i got this a while back.http://www.ebay.co.uk/itm/291399023398?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITI have it on my bench attached to a ATX psu, the psu has a mobo attached to let the psu run. The DDS unit keeps displaying daft characters and turning itself on and off randomly. The waveform it outputs on say a sine wave is more like a stair step and a triangle wave is like the same.Any ideas before i throw it out my window.

author: Isad
author_rank: Frequent Contributor
timestamp: August 02, 2015, 10:41:13 pm
content: Quote from: Deathwish on August 02, 2015, 08:35:42 pmTry and run it off a battery.These are crap things but for the money they kinda are good.If you want to throw it off the window i will get.Lol

author: onlooker
author_rank: Frequent Contributor
timestamp: August 02, 2015, 11:16:52 pm
content: Check the ripple and noise of your PSU. I have seen tablet having the keyboard typing itself when the PSU noise reaches about 200mVpp.

author: TheMG
author_rank: Frequent Contributor
timestamp: August 03, 2015, 03:58:11 am
content: Quote from: Deathwish on August 02, 2015, 08:35:42 pmNo need for that. Connect green wire from the ATX 24-pin motherboard connector to any black wire.Heck, at work I even have a super special custom paper clip I use for powering up and testing suspect computer power supplies.Quote from: onlooker on August 02, 2015, 11:16:52 pmI'd check this too. An all too common problem with computer power supplies is that the capacitors go bad, causing excessive ripple which then causes the computer to randomly crash or not boot up at all. Could be what's messing up your DDS.Or.... it could just be a faulty piece of eBay garbage.

author: Bud
author_rank: Super Contributor
timestamp: August 03, 2015, 04:05:07 am
content: I was horrified by the seller's oscilloscope

author: Isad
author_rank: Frequent Contributor
timestamp: August 03, 2015, 11:14:56 am
content: Quote from: Bud on August 03, 2015, 04:05:07 amLol look at the trace rotation hole somone must have doen it by hand or somthing good old knifes.

author: Deathwish
author_rank: Unknown
timestamp: August 03, 2015, 11:36:14 am
content: Quote from: TheMG on August 03, 2015, 03:58:11 amThe mobo is only on there to give it a load, not so I can start the psu up. As for it being ebay garbage, i am leaning that way.
Ebay Hakko FX-888 - Page 1
Forum section: electronics / projects

author: Tioleco
author_rank: Contributor
timestamp: March 03, 2013, 07:19:59 pm
content: Will be really original this iron?http://www.ebay.com/itm/New-Original-HAKKO-FX-888-Soldering-Iron-SMD-Soldering-Station-FX888-Ceramic-/110970864927?pt=LH_DefaultDomain_0&hash=item19d661051f

author: jamesp15
author_rank: Regular Contributor
timestamp: March 03, 2013, 07:52:11 pm
content: That looks to be the hand-piece ONLY.I would ask the seller if its the complete station (the base unit that plugs into the wall, iron/hand-piece holder, etc)(good picture here of everything it SHOULD come with if its the full unit:http://www.amazon.com/Hakko-FX888-FX-888-Soldering-Station/dp/B004M3U0VU)

author: jadew
author_rank: Frequent Contributor
timestamp: May 06, 2013, 06:13:30 pm
content: It is original, but it's only the iron, with out the station. Overpriced too.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: May 07, 2013, 01:08:56 am
content: A full hakko 888 digital shouldnt cost much more than $100www.sparkfun.comhas them for 90 something and you know its not imitiation and comes with the station not just the handle
ebay lithium ion battery pack - Page 1
Forum section: electronics / projects

author: tyson
author_rank: Newbie
timestamp: May 06, 2019, 08:36:20 am
content: Hi,I am planning on building a portable Bluetooth speaker, in the past i have used a Sealed Lead Acid battery as the power source and it has worked pretty well. But this time i want to make the switch to a Lithium ion battery to save weight.I wanted something cheap and pre-built (because i don't feel like building my own pack because i don't have the proper tools and i am on a tight budget) so i went on ebay and found a "12v 20,000mAh lithium battery with charger"I was just interested if anyone has had experience with these battery and if they are worth it, but also if they have the appropriate protection circuits or if they can even output what they clam.(link:https://www.ebay.com.au/itm/20000mAh-Li-ion-DC-12V-Super-Rechargeable-Portable-Battery-Pack-w-Power-Charger/323728329157?var=&hash=item4b5fb649c5&enc=AQADAAADQFjVrDbVsZ8oH%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduVYXCMg7avXbBiXt4VUhnMRTosQs3N1YNvFmA8JKeNTPv609lG88VMugLRYqd%2FcPQPsHfBaid4jJQdI0TeaTiHlbALdOWuZkpCP8cLMv%2FjB5KvLnzZrUZW4D0zjyQHnr3TlKotMzIZSg%2BN7NJCGqMkJsxM6uGBKCRJNaA7Q0MT%2BMyBItHZF4mR%2B9ywSs1%2BAD%2F2mBDs6bTIpO2SMJF4znzSr71pFjQVMOD0lrwImA7oYGuHDkw1isi9NJ4ko7i7kcllplRmMF%2B%2B70LRQ5eqmJ%2Bc9RC32y4XPI5KUUrUVBi0HYGFpmPAqhMJXETzN%2BQlwghPEbLJ%2BbCPd8zhUSV243UkUXtUlKCgDNPOU8ZY3Xi3%2Fn5r4spg2jHWwgvgccJiRtHeSBro9HcIwvHnO29iPsY3J8jKSzfIreXoYx00UNeDttgrWLNDJEN%2B3b20%2BWRMqwcYJFDmR6A1%2BIoqb806wyRSPvb%2BqcbNvBhS%2BYEmKm%2FaOxPRMywTKAnxJ8icg5nlNf1qzSFFqTXmEh24tygr19%2Fib%2BGLmkb4JkUOsFePKasV4KCXhjiaAgieM0HPg3Hre2vArPEvl45N7YXgzk5vAaJG7vMgltMjZT9hifRBoPi6qVbcz5F6DARpZ1cdyjNoEDdaX6qce2iWs50iLhDSBpQNMBTv33N1g375y%2BZc83NGGCrHTwisWOR8fQVrK41alLbWCO%2F2srn%2BZ9ZorHJdONoLCPAU5NLhqDma8ktcWU9f11vpK6U6DDfUHYAKQ75BXFOpXhB%2F5AOuPLbFUt1ErIfGuI3Iaj2oEzA6z3tk3ZGVui0vHz5aFD1fqBFgnG9grgHtOONoAVwA3Gr1TomEiyCFyMIU3Fc8v0MTqEHKrULdgRGrqb5t8NBroZMfavH%2BPwatF3U2HtKrEldUpAMONUWgbi5iIRJaBxtqW%2FvSat3U2u4EiRuIQj5l0tr9RFqvUi%2FpUvZjUKuyfkem%2B9FINWWVWAv4lmN4KRVNtL4LVfLCr4NL9gUAy1gqxvrDzkG%2FWbPC7UMTnl%2BI%2F%2BwnxMECbpuMBl%2FnEQ5WabVtT4TADLkI%2F0w%3D&checksum=323728329157ffb0b98d112e4ff4b477d9743c62026b&frcectupt=true)ThanksTyson
Ebay LM3914 ICs - Page 1
Forum section: electronics / projects

author: Signal Simon
author_rank: Contributor
timestamp: August 13, 2019, 10:14:45 am
content: Does anyone have experience of the DIP LM3914s available on Ebay and the like at a very cheap price?Photos all seem to show the elliptical style National Semiconductor logo and with markings in a variety of fonts.Just wondering if these things are any good - are they new old stock, recovered units or, new fakes?I know TI still make the SMD but not the DIP version. I've done my 30 bargraph PCB design based on the SMD version (from a mainstream supplier) then found out how difficult that package is to solder without a reflow oven (I've got a 4-element 1200W mini oven to convert) - and to top it off I've missed the tracks between MODE on U2 to LED1 on U5, and MODE on U5 to LED1 on U7 (hence the bodge wires) so i'm going to need a board respin anyway.Simon.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 13, 2019, 11:37:33 am
content: they make through-hole plcc socketshttps://www.digikey.ca/product-detail/en/3m/8420-11B1-RK-TP/3M2011B1-ND/1026470

author: magic
author_rank: Super Contributor
timestamp: August 13, 2019, 11:42:42 am
content: Quote from: Signal Simon on August 13, 2019, 10:14:45 amI have bought a few fake Prolific UARTs from "eBay and the likes". They worked. One I destroyed, another I thought I had destroyedDecapped both, each different. Looked at zeptobars pictures of two another PL2303 dies, neither was like mine.I also decapped some fake DS18B20 and found two different variants too. One of them was atrocious garbage, the other just crappy.It's called Chinese roulette for a reasonYou never know what you get.

author: Signal Simon
author_rank: Contributor
timestamp: August 13, 2019, 08:43:28 pm
content: Quote from: Alex Eisenhut on August 13, 2019, 11:37:33 amI hadn't thought of that option, but I think I will just go with soldering to the board....in a more appropriate manner!I've done all my SMD assembly and repair with a conventional iron up to now, as I've used SOICs and 0805 or larger passives.In the interim I think I will be buying a hot air tool - and ordering a solder paste stencil with the new PCB.Simon.

author: thm_w
author_rank: Super Contributor
timestamp: August 13, 2019, 09:45:07 pm
content: https://www.eevblog.com/forum/projects/lm3914-led-driver-chip/https://www.eevblog.com/forum/microcontrollers/replacement-for-lm3915/

author: djacobow
author_rank: Super Contributor
timestamp: August 13, 2019, 10:55:56 pm
content: Why are the smt parts hard to solder by hand?Seems like plenty of flux, drag soldering, and some braid to fix oopses should work nicely.
EBay Navman Navman TU60-D120-131 Firmware? - Page 1
Forum section: electronics / projects

author: Bryan
author_rank: Frequent Contributor
timestamp: May 23, 2016, 08:12:49 pm
content: All:Saw these units on Ebay and there is projects out there using it as DIY 10Mhz GPSDO because of their stable 10Khz output. Issue is it needs firmware v1.18 or greater. Anybody by chance have purchased from this seller and can confirm what the firmware version is.http://www.ebay.com/itm/Navman-TU60-D120-131-12-Channel-GPS-Time-and-Frequency-Reference-/131819953988?hash=item1eb114df44:g:vvsAAOSwLzdWRQcx

author: Bryan
author_rank: Frequent Contributor
timestamp: May 27, 2016, 05:59:51 am
content: bump
ebay NTC thermistors... any good? - Page 1
Forum section: electronics / projects

author: that_guy
author_rank: Contributor
timestamp: November 20, 2018, 09:41:57 pm
content: Search ebay for "NTC thermistor probe" and you get a ton of results for probes starting at barely $2 each. Has anyone here tried them and if so are they accurate enough to be worth the few dollars they cost for hobby use?

author: DaJMasta
author_rank: Super Contributor
timestamp: November 20, 2018, 10:07:28 pm
content: NTCs are pretty cheap, so I don't see why not. The probe itself probably won't be good for very high or low temperatures and probably isn't built to last for decades... but that's not usually what you need.They have K type thermocouples for around the same price and you can get temperature meters with display and battery for almost the same price, for $2 for a thermistor is almost paying extra

author: that_guy
author_rank: Contributor
timestamp: November 21, 2018, 07:25:52 am
content: I guess my main concern is that I'd spend $2 on a probe and then $200 of my time wondering why the readings don't linearize properly.
Ebay Voltmeter with negative voltage reading capability? - Page 1
Forum section: electronics / projects

author: rfengg
author_rank: Regular Contributor
timestamp: April 11, 2022, 08:23:58 pm
content: Ebay is rife with 3 terminal voltmeters that can read voltages which are higher than the negative terminal of the voltmeter and they work well for the price.Here is my problem : I have a +3.3V supply and a -2.5V supply with a common ground which are derived from +9V and -9V respectively using voltage regulator IC's and would like to monitor these supplies using these Ebay displays.I have connected the +3.3V supply to the sense terminal of the aforesaid 3 terminal voltmeter with the Vcc of the display being connected to 9V from where the 3.3V is derived and all's well.To monitor the -2.5V rail, when I connect the -2.5V to a second voltmeter sense terminal , it shows zero as it cannot seem to read voltages that are are lower than its negative terminal.I tried connecting the -9V and ground terminals to the negative and positive terminals of the display but then when I connect the sense terminal to the -2.5V , it reads 6.5V as it should.Are there cheap LED meters (below $5) that can indeed read negative voltages as well? What other alternates do I have that can fix this issue?

author: ledtester
author_rank: Super Contributor
timestamp: April 11, 2022, 08:57:52 pm
content: Have a look at this ICL7107 ammeter kit:https://www.aliexpress.com/item/4000452559613.htmlHere's a schematic:It has everything you need for a meter including voltage reference, display LEDs, mounting bezel and -- importantly -- a charge pump to generate a negative rail so you can read negative voltages.It is set up as an ammeter, i.e. to measure current. but it should be easy to modify it for voltage -- perhaps by just removing R5.You can adjust the input range by choosing an appropriate voltage divider for the input. Have a look at this ICL7107 voltmeter project:http://www.electronics-diy.com/ICL7107_volt_meter.phpIt's only 3 1/2 digits, but it's also pretty cheap.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 12, 2022, 01:37:47 am
content: Another way is to use an inverting opamp to turn the negative voltage into a positive voltage.

author: magic
author_rank: Super Contributor
timestamp: April 12, 2022, 04:28:45 am
content: There are panel meter modules with ICL7106 (LCD, sometimes backlit) and ICL7107 (LED). They are a bit more expensive and not as common, they use a total ~9V supply and have differential inputs, but not rail to rail (~1V on each side IIRC). So you would need to power it with ±5V, perhaps. They measure up to ±200mV natively or 10x/100x more with a divider, often included on-board, sometimes easy to adjust. It's also important that the decimal dot be adjustable too, or it will look weird.
Ebike battery challenge Panasonic NKY397B2 NKY352B2 - Page 1
Forum section: electronics / projects

author: Flans
author_rank: Newbie
timestamp: September 07, 2022, 11:28:35 am
content: For my ebike akku I made a new battery pack. I have converted the Panasonic BMS but the battery will not charge. The pack is nicely balanced, NTCs are in order. When the battery pack is connected to the charger there is no error message but also does not charge. It seems that the BMS firmware is not booting (correctly). Does anyone have a suggestion how I can solve this?

author: thm_w
author_rank: Super Contributor
timestamp: September 07, 2022, 09:55:00 pm
content: You "converted" the panasonic BMS, what does that mean?Did you take the BMS from the old pack and replace all of the cells? Photos will always help.There is a chance that the BMS when power is lost will wipe some of its storage and prevent future use. Is there a communication wire for authentication?Does the charger output any voltage without the pack connected?
ebike charger conector - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: August 15, 2020, 04:07:49 pm
content: hi all,can anyou id this conector,the cener piece with the 3 holes is about 8mm dia and the outer about 12mm,i need to find what its called so i can order the male part that fits it,cheers in advance,

author: Pawelr98
author_rank: Regular Contributor
timestamp: August 15, 2020, 05:19:31 pm
content: Microphone connector

author: glentek
author_rank: Regular Contributor
timestamp: August 15, 2020, 10:01:48 pm
content: Check the dimensions of a mini XLRhttps://au.rs-online.com/web/p/xlr-connectors/6285639/
ebike charger workaround - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: March 18, 2021, 09:49:54 am
content: hi all i have an 18s/8p ebike battery,its a colbalt pack not lipo4 so 4.2v per cell,i have a charger for a 13s pack,ie 54.6v the 18s pack needs 75.6v,can i set my lab psu too 20v and wire that in series with the 13s lipo charger and use that to charge the 18s pack?,thanks in advance,m3vuv.
Ebike hub motor question. - Page 1
Forum section: electronics / projects

author: Halvmand
author_rank: Regular Contributor
timestamp: July 05, 2016, 11:53:59 am
content: I have gotten ahold of some parts from an E bike. The controller Was toast. no power to 12 and 5 volt rails. But the motor cheeks just fine as well as the battery (shows to be cycled only 4 times).My questions is though: the motor has three wires that are not the phase wires. I kinda believe it is a single hall sensor, but I'm hesitant towards taking the whole motor apart to find out. Is there a bay to check what it is without destruction?Most ebike motors I find have 3 hall sensors to know the position.Is this just a single hall sensor for a speed signal or something. It had a display, which was partly working which might explain the need for some sensor..

author: voltsandjolts
author_rank: Unknown
timestamp: July 05, 2016, 12:17:05 pm
content: If you can get some manufacturer details off the motor there is a huge swathe of info on the Endless Sphere forums for ebikes.https://endless-sphere.com/forums/

author: Halvmand
author_rank: Regular Contributor
timestamp: July 06, 2016, 07:50:39 am
content: Thanks. there is a number on the motor.I'll try that forum.
EBL 9v battery factory oops! - Page 1
Forum section: electronics / projects

author: IanJ
author_rank: Unknown
timestamp: November 19, 2020, 01:12:44 pm
content: Hi all,A customer of mine sent me this photo......all ready to pop a couple of EBL batteries into his brand new PDVS2mini.......but spot the problem!!!﻿Ian.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: November 19, 2020, 01:14:39 pm
content: Quote from: IanJ on November 19, 2020, 01:12:44 pmI guess just heat shrink plastic label is other way round, not the polarity , still funny though.

author: jeroen79
author_rank: Frequent Contributor
timestamp: November 19, 2020, 01:39:43 pm
content: They're marked for electron current instead of conventional current.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 19, 2020, 01:48:47 pm
content: A complementary pair! Are they well matched?

author: Haenk
author_rank: Super Contributor
timestamp: November 19, 2020, 02:01:20 pm
content: It's a bipolar version of the battery.

author: madires
author_rank: Super Contributor
timestamp: November 19, 2020, 02:14:25 pm
content: It's simply physics! If there's a battery, then there's also an anti-battery.

author: jh15
author_rank: Frequent Contributor
timestamp: November 19, 2020, 02:51:04 pm
content: It's rechargeable, so current reverses. But looks like one battery to discharge, and one that is charge only. Sort of like a write-only memory, (no read)

author: Cerebus
author_rank: Super Contributor
timestamp: November 19, 2020, 03:11:24 pm
content: Quote from: Haenk on November 19, 2020, 02:01:20 pmThere's a Lithium joke in there somewhere.

author: IanJ
author_rank: Unknown
timestamp: November 19, 2020, 05:04:57 pm
content: I have about 50 of these EBL batteries (for batch function testing).......I just checked them all and they are ok....:-)Ian.

author: james_s
author_rank: Super Contributor
timestamp: November 19, 2020, 07:23:00 pm
content: I'm betting it just got flipped around before it went into the machine that applies the label. If the actual polarity is wrong for the terminal gender then that's an issue. In this case I'd just use a permanent marker to cover the markings.

author: perieanuo
author_rank: Frequent Contributor
timestamp: November 23, 2020, 05:39:49 pm
content: the li-ion is the big inovation here, maybe tesla launched one?
EBR-1 recommended visit - Page 1
Forum section: electronics / projects

author: Teledog
author_rank: Regular Contributor
timestamp: July 23, 2018, 08:34:23 pm
content: Slightly off-topic (technical stuff, none-the-less)Just got back from a visit to the EBR-1 (google it) reactor site in Idaho ..it was HOT there..sun, not gammaUtterly fascinating!!If you've got the time & patience (long hot drive), I'd recommend it to any geek!Only open between May long weekend & early Sept (labor day) , ..found that out by mistake a few years ago..arrived to see it closed 2 days after labor day :-(Free admission & tours.One of turbine reactors outside is still a little ahem; "hot" if you bring a counterSpent several hours there..I'd love to go back again & spend more time (GF wasn't terribly impressed)The building seems average from the outside, but seems HUGE inside...weird.US Gov. warning signs all around the perimeter..near the INL..high security everywhere..in the middle of the desert.Interesting reading;https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=2ahUKEwjCl9mkhbbcAhVkMn0KHd86D6kQFjABegQIBRAC&url=https%3A%2F%2Fwww.ne.anl.gov%2Fpdfs%2Freactors%2FStory-of-BORAX-Reactor-by-Ray-Haroldsen-v2.pdf&usg=AOvVaw1rRtLk166dhlxqBrUEpjw5

author: sdouble
author_rank: Frequent Contributor
timestamp: July 23, 2018, 09:01:36 pm
content: As far as i remember this was the first nuclear reactor to produce some electricity....it 's also the first core which did (partially) melt...

author: Gyro
author_rank: Super Contributor
timestamp: July 23, 2018, 09:11:10 pm
content: QuoteAhem...http://www.engineering-timelines.com/scripts/engineeringItem.asp?id=778(Depending what you mean by "produce some electricity")EDIT: I think it probably hangs on whether EBR-1 could be considered a 'Commercial nuclear power plant' or not. There was also an experimental plant at Obninsk, Russia producing power early in 1954 which probably pre-dates EBR-1https://en.wikipedia.org/wiki/Obninsk_Nuclear_Power_Plant

author: sdouble
author_rank: Frequent Contributor
timestamp: July 24, 2018, 08:22:35 am
content: I found that EBR1 produced .. 200 W at the end of 51

author: Gyro
author_rank: Super Contributor
timestamp: July 24, 2018, 08:47:14 am
content: Well, I suppose, yes, thatis'some electricity'!From 200W in 1951, to 6MW (Obninsk) in 1954, to 60MW (Calder Hall) in 1956. With that expansion rate i guess we're lucky we're not outshining the Sun by now!
ecg by ads1298 - Page 1
Forum section: electronics / projects

author: ali.gerami672
author_rank: Newbie
timestamp: September 03, 2017, 09:56:20 am
content: HiThis is a schematic?

author: Rerouter
author_rank: Super Contributor
timestamp: September 03, 2017, 10:42:15 am
content: Is it a schematic: Yes,Can I tell if its suitable when its shunk down so small: No,The IC you referenced is a Delta-Sigma 8 channel ADC for ECG applications. At a guess it looks like you have ignored the advice of the datasheet when it comes to how the electrodes should be wired for direct contact to a patient, as such i would say its likely unsafe.

author: ali.gerami672
author_rank: Newbie
timestamp: September 03, 2017, 12:30:46 pm
content: Are I connected correctly ECG(ADS1298) pins?
ECG front end simulation - Page 1
Forum section: electronics / projects

author: bmi.bitmesra
author_rank: Newbie
timestamp: November 28, 2016, 05:32:34 am
content: Hello.I want to simulate the ecg front end circuit but I dont know how am I gonna feed in the input so that i can get an ecg at the output stage. I found this circuit here on this forum and i am interested in developing it for my forthcoming mini project. The circuit is attached. If I can simulate it using NI MultiSIM ? Also while I was trying to build the same in MultiSIM I was unable to find MCP6002 IC.If you guys can help me it would be a big support.

author: seekingforprogress
author_rank: Newbie
timestamp: December 11, 2016, 09:02:54 pm
content: Hi!I am searching ecg simulation,too. I need the desing and simulate an ecg circuit in protues or else but ? dont know how to add ad8236 into proteus and I dont know how can ? get the signal in the simulation instead of coming out ecg probe that place on a human.

author: trophosphere
author_rank: Frequent Contributor
timestamp: December 12, 2016, 04:37:06 am
content: This pagecontains a link for the MCP6002's SPICE model (Expand the "documentation" section on the bottom and scroll all the way down until you see Spice Model).This pagefrom NI may help you in figuring out how to generate a custom signal for your simulation.
ECG the easy way - Page 1
Forum section: electronics / projects

author: Terry Bites
author_rank: Super Contributor
timestamp: January 21, 2021, 03:49:52 pm
content: I've seen a few people asking about ECG amps. Mostly pulling out their hair or drowning in noise because they've earth referenced their designSo I thought why not do it the easy way, single op-amp one decent inst amp no precision matched parts one CMRR trim. So here it is-
ECG to standard oscilloscope questions - Page 1
Forum section: electronics / projects

author: myster1086
author_rank: Contributor
timestamp: December 18, 2018, 10:59:23 am
content: So I recently had a friend come in possession of a full ct machine, got to help tear down in exchange I could pick thru the electrical parts I liked. Needless to say I grabbed up the power supply, all the transformers, and the patient monitor.Its an ivy biomedical systems 101 patient monitor. It uses a small crt to display heart rate. Looks just like an oscilloscope.What I'm wanting, if possible, instead of just heart rate, can it be made to show any ac electrical signal? What would need to be done?

author: Rerouter
author_rank: Super Contributor
timestamp: December 18, 2018, 11:06:16 am
content: It should have an isolated input for each of the 2 polar channels, if you feed a small voltage (e.g. 200mV max) you should see it respond on screen, though you may not be able to increase the sweep rate without more significant modifications.

author: myster1086
author_rank: Contributor
timestamp: December 19, 2018, 05:05:33 am
content: That's the thing right, so it picks up sound as well, like a piezo. I clipped onto a bare piece of metal, one clip had its own, it displayed the taps bumps and coughs. Its 3 probe. Black red and white. I read somewhere about filters, bit this seems above my pay grade, as I cant find anything on it

author: DaJMasta
author_rank: Super Contributor
timestamp: December 19, 2018, 05:14:58 am
content: Isolation is important for any biological use, but not so critical for other applications. I think you should be able to see a lot of other things with it, given they're within the fairly low bandwidth, but the frontend will be pretty high impedance and you'll only have one (low) range, I expect. Measurement is done on a differential signal, so you need at least two, but if it uses all three channels to average and create the difference signal for the three, it may need all three in use to read something useful - not sure how these things are typically setup. You could also have two signal and a common, effectively.
ECL Clock Divider - Page 1
Forum section: electronics / projects

author: linotype
author_rank: Newbie
timestamp: June 20, 2023, 09:36:53 pm
content: I'm trying to reverse engineer a 36 year old Trimble GPS receiver, and I've stumbled across something a bit confusing in the clock synthesizer.The system uses a VCO generated 768F0 (F0=1.023MHz) clock as the basis for all of the other clock signals. The 768F0 clock is PLL locked (through a chain of dividers) to a tuneable 16F0 quartz crystal clock, which is PLL locked (through more dividers) to a 10MHz OCXO.The PLLs are based on Motorola MC12040 phase-frequency detectors.Right now, I'm trying to understand the circuitry behind the 768F0/16F0 comparison circuitry The divider chain uses two RCA CA3199 ECL ÷4 dividers to bring the 768F0 down to 48F0, which is then fed into a Hitachi HD10131 ECL flip-flop pair to... and this is where I get confused. I would think that the logical thing to do here would be to divide the 48F0 clock by three, so that the the MC12040 would be comparing two 16F0 signals.Tracing out the connections for the HD10131 produces the attached circuit. It seems to me (and a naive simulation run confirms this) that U9B divides the clock by two, then U9A effectively just inverts the clock, which seems like a waste of a flip flop. It seems to be a ÷2 circuit, not a ÷3 as expected.Caveat #1: This circuit uses ECL logic, and I did my simulation in a TTL simulator. ECL is quite foreign to me, and I don't know what the influence of the "pull-down" resistors is in the circuit. I know ECL can do wired-OR, but I can't wrap my head around how that might make this circuit into a ÷3 circuit. And yes, those are the values of the resistors, it seems Trimble had no qualms with using 1% resistors basically everywhere.Caveat #2: There might be connections between pins hidden under the HD10131. I didn't check for those with a multimeter, but I probably should, but that means taking the thing apart again.Am I missing something? For the curious, PCB images can be found here:http://beefchicken.com/gps/trimble/4000/sxdeepdive/10850-component.jpeghttp://beefchicken.com/gps/trimble/4000/sxdeepdive/10850-copper.jpeg

author: edavid
author_rank: Super Contributor
timestamp: June 20, 2023, 10:14:41 pm
content: I think the U9A not-Q is wire-ORed to the U9B D input, making a divide by 3.

author: Benta
author_rank: Super Contributor
timestamp: June 20, 2023, 10:15:03 pm
content: It's a divide-by-3, but you're missing a connection.Connect the two "not"-Q outputs together, and the D input at U9B is then a virtual OR.Then make the truth table, you'll see it yourself.

author: linotype
author_rank: Newbie
timestamp: June 21, 2023, 05:16:29 am
content: Ah, that makes sense. I should have taken a moment to do the truth table, but I was hung up in ECL being magical. Thanks for your help everyone.
ECL flip-flop help - Page 1
Forum section: electronics / projects

author: allanw
author_rank: Frequent Contributor
timestamp: July 24, 2010, 02:34:19 am
content: I've been trying to figure out this ECL flip-flop which is a part of the HP 8116A function generator I've been trying to fix. It's an MC10231P:http://www.datasheetcatalog.org/datasheet/motorola/MC10231L.pdfNo matter what I do, I can't get valid outputs from the chip. I've even ordered a replacement for the chip and that one still doesn't work, so I think it's human error.My connections are like this: voltage source positive end to ground, and negative end to -5.2V rail. I connect -5.2V to pin 8, Vee, and ground to Vcc1 and Vcc2. Hopefully this is correct. The new chip draws 54mA in this state, the old chip I pulled from the 8116A draws 33mA.The datasheet says the flip flop has asynchronous set/reset, so I've tried setting R = L and S = H (R = -5.2V, S = 0V). Then I measured the outputs to be Q = +0.15V and ~Q = 0V. Then I flipped R = H and S = L, and the outputs were Q = 0V and ~Q = +0.07V. I've even tried clocking it with D = L and H, and R = L, S = L but nothing happens either. What am I doing wrong here? :/

author: jahonen
author_rank: Super Contributor
timestamp: July 24, 2010, 11:48:27 am
content: I think that ECL outputs need a termination voltage via resistor to work correctly. For details, seeTermination of ECL Logic Devices.Regards,Janne

author: Time
author_rank: Frequent Contributor
timestamp: July 25, 2010, 01:01:49 am
content: Are you testing the chip by itself or are you testing the chip on the actual PCB of the function generator?Quote from: allanw on July 24, 2010, 02:34:19 am

author: allanw
author_rank: Frequent Contributor
timestamp: July 25, 2010, 01:42:43 am
content: Quote from: jahonen on July 24, 2010, 11:48:27 amI think you're right. I'll try terminating the outputs with 100 ohm to -2V.I'm testing the flip flop out of circuit.
ECM Mic OK with old PC sound i/o, v. quiet with new PC USB - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: June 18, 2024, 09:02:07 pm
content: Firstly, apologies because the issue may be solvable in software. I thought though I'd ask on this forum in case anyone else had solved a similar issue.I have a new 'Nuc' type PC to replace my 14-year old desktop both running Windows 10. My Sony ECM-DS70P works fine with the desktop's integrated audio panel, but (despite changing what I can on the new PC), is barely registering my voice when used with the UGREEN audio adapter.I am wondering if I can hack it physically (maybe some gain setting resistors inside)?, but it looks like the unit's face has been perhaps ultrasonically welded - I see no way to have a look inside.Another idea would be a pre-amp, but it would be messy then getting at the USB power without another lead.Of course, ideally it could be a software setting. The issue of "USB Microphone is quiet" is one yielding a deluge of 'hits'; but I'm running out of new ideas.Under Control Panel|Hardware and Sound|Recording:Levels- Here, the "Apply" button is disabled, even if I change the level - however it is already at 100%.

author: moffy
author_rank: Super Contributor
timestamp: June 18, 2024, 11:16:18 pm
content: Does the Ugreen unit provide the power necessary for the mic?

author: DimitriP
author_rank: Super Contributor
timestamp: June 18, 2024, 11:57:20 pm
content: If the UGREEN adapter doesn't state it has a STEREO Microphone INput, it probably doesn't.This one does:https://shop.andreacommunications.com/usb-ma-premium-external-usb-microphone-adapter/

author: 741
author_rank: Frequent Contributor
timestamp: June 21, 2024, 01:49:37 pm
content: Thanks for the caution about stereo input. That worries me. Havingg said which, when i tried a 'lapel' microphone it seemed to give no output at all.As for the power into the ECM, I am simply guessing it could be a basic power via resistor to Vcc like the circuits commonly seen for ECM. I could check if I had the correct plugs to hand.
ECU Data - Page 1
Forum section: electronics / projects

author: Poe
author_rank: Frequent Contributor
timestamp: March 26, 2015, 01:06:10 am
content: I know certain fault codes are stored in an automobile's ECU's nonvolatile memory, but does anyone know of other data? ..or how to retrieve it?

author: Neverther
author_rank: Regular Contributor
timestamp: March 29, 2015, 03:10:33 pm
content: Universal:Lift and read the memory chips.The rest depend on the ECU itself. For example KWP2000+ is able to read and write enginemaps to some ECUs using the KWP proto.

author: Niklas
author_rank: Frequent Contributor
timestamp: March 29, 2015, 04:05:21 pm
content: Adaptation data (wear and tear of transmission clutches, driver behaviour for kickdown), market specific configurations (miles/kilometers, gallons/liters) etc.The exact location of the data is not guaranteed to be stored at the same memory address for all the models and makes of one single car manufacturer. You might need a map file from the compile and link of the exact version you have. ISO14229 has a concept of building up Record Identifiers, with two useful modes of requesting data from an ECU: ReadByAddress and ReadByIdentifier. The latter one is handy for a subset of standardized parameters but will not help in case you want to read internal parameters.

author: dexters_lab
author_rank: Unknown
timestamp: March 29, 2015, 04:17:37 pm
content: Quote from: Poe on March 26, 2015, 01:06:10 amdepends on the age & type of ecu and the model of vehicleECUs have been storing fault codes from the 1980s, i certainly know the toyota 4a-ge (& gze) and many other toyota ECUs from the 1980s onwards had hidden diagnostic modes (but requires physically hacking the hardware to access it).Modern ECUs will be OBD2 which could have 100s of parameters available for real-time monitoring through a cheap bluetooth OBD2 reader and an app on your phone or tablet (eg:https://play.google.com/store/apps/details?id=org.prowl.torque&hl=en_GB)
ECU diagram(s) needed for electronics course - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: January 27, 2019, 12:21:28 am
content: I'm taking an introduction to electronics class as a hobbyist and the professor wanted us to find any car's ECU diagram so that he can teach us how it's been laid out.Seems like such things are very hard to come by. Anyone have such a thing?

author: rbm
author_rank: Regular Contributor
timestamp: January 27, 2019, 01:02:38 am
content: Look on the Net for Bosch technical literature about their Motronic fuel injection systems. They might have what you're looking for, if it is at the functional block diagram level.If you are after more detailed schematics, then Megasquirt project will have what you're looking for.http://megasquirt.info/
ED5540 High voltage diode specs needed - Page 1
Forum section: electronics / projects

author: whipaway
author_rank: Contributor
timestamp: January 18, 2017, 12:43:33 am
content: Hello everyone.I have a whole bin filled (must be hundreds of these things, NOS) with a diode that is marked ED5540, and underneath that it is marked EDI 7650.I am assuming that ED5540 is the part number, EDI is the manufacturer and 7650 is the date code.I have contacted EDI about the specs of this part, they never replied back.Google searches turn up nothing.These diodes came from a high voltage power supply manufacturer.I am hoping that an old timer reading this post might have an EDI databook or something, and can look up the specs on this part.I am most interested in the PRV, I am thinking that these diodes could be used as the HV rectifier in Victoreen CDV-700 Model 6A and Bs radiological survey meters.

author: amyk
author_rank: Super Contributor
timestamp: January 18, 2017, 03:49:33 am
content: Do you have a picture of them? Seeing the package can narrow down the possibilities considerably. They might not necessarily be HV diodes, they could be 1N5540. You could also test them yourself.

author: whipaway
author_rank: Contributor
timestamp: January 20, 2017, 01:39:20 am
content: I tested few for Vf, with averages at about 5 volts.No Zener action with voltages up to 1000v across the device.I'm going to dissect one to check its internal constructionWill post pics soon.
edge Connector for Amiga A600 Chipram expansion - Page 1
Forum section: electronics / projects

author: lk
author_rank: Regular Contributor
timestamp: October 01, 2016, 05:50:08 pm
content: Greetings,I attempting to make a 1Megabyte ram expansion for my Amiga 600. Based off the work of Elgenhttp://elgensrepairs.blogspot.dk/2012/10/homemade-1mb-chip-ram-expansion-for.htmlHowever i would like it to be based on a PCB, rather than the way its done here. however i have a hard time finding a 40 pin, 2 row connector, 1.27 mm pitch. I could use the PCI adapter that Elgen uses, but im concerned with how well it will be secured when edge mounted.Here is an official product that uses an edge connector.http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=1151I have searched both Mouser and Digikey, but i have not been able to get any results that looks useful.Does anyone have any idea, on what the part number of the connector is need is?-lasse

author: ovnr
author_rank: Frequent Contributor
timestamp: October 01, 2016, 09:13:48 pm
content: Ask and ye shallreceive.

author: lk
author_rank: Regular Contributor
timestamp: October 01, 2016, 10:12:05 pm
content: Thank you Ovnr,I will have a look at it,I found this alternative that is cheaper. After realizing that i was looking for a 80 pin not a 40 pin connectorhttp://www.mouser.dk/Search/ProductDetail.aspx?R=TX24-80R-LT-H1Evirtualkey65610000virtualkey656-TX24-80R-LT-H1E-lasse

author: Elgen
author_rank: Newbie
timestamp: October 03, 2016, 08:43:09 am
content: That's a jawsum idea, Lasse! };-PMy attempt was mostly made as a proof-of-concept.If you're making a PCB layout, would you then open-source it so everybody would be able to do their own?Love and Best of Luck with the project.<3 Elgen };-P

author: lk
author_rank: Regular Contributor
timestamp: October 03, 2016, 10:29:59 am
content: Hi Elgen,Ofcourse dont mind making it open source, especially considering that its based on your work-lasse