hybridfree/eevblog-posts huggingface dataset:
Making symmetric full-wave rectifier by using two isolated secondary windings - Page 1
Forum section: electronics / beginners

author: hkBattousai
author_rank: Regular Contributor
timestamp: September 14, 2014, 09:52:11 am
content: I have a transformer with the dot conventions given in the image blow. I design the full wave rectifier in the same image. However, I'm very confused and can't make it sure how to connect the transformer to the circuit.Please help me by matching theSA1,SA2,SB1,SB2pins to theUP,MID,DOWNnodes.

author: Simon
author_rank: Unknown
timestamp: September 14, 2014, 09:54:05 am
content: Connect SA2 and SB1 together, that is GND. the other two don't really matter, any way you fancy.

author: hkBattousai
author_rank: Regular Contributor
timestamp: September 14, 2014, 10:00:41 am
content: Quote from: Simon on September 14, 2014, 09:54:05 amDo you imply that I must use one of these four schemes?Code:UP <---> SA1MID <---> SA2, SB1DOWN <---> SB2UP <---> SB2MID <---> SA2, SB1DOWN <---> SA1UP <---> SA2MID <---> SA1, SB2DOWN <---> SB1UP <---> SB1MID <---> SA1, SB2DOWN <---> SA2A dotted pin from one winding must be connected to the non-dotted pin from the other one; they will together be connected to GND. The other pins will be connected to UP and DOWN interchangeably. Is this correct?

author: Simon
author_rank: Unknown
timestamp: September 14, 2014, 10:06:20 am
content: that is correct,you could use any combination including dots together or non dots together as GND and it would seem to work but then you can end up with both side feeding the same cap in alternate half wave rectifier mode which is not really any good for a number of reasons for the transformer, efficiency or the load.

author: DanielS
author_rank: Frequent Contributor
timestamp: September 14, 2014, 03:07:51 pm
content: You simply tie a dot to a no-dot end which becomes your center-tap/neutral-out and then put a full-wave rectifier across the remaining two outputs. That is the most common and usually preferable way to do symmetrical non-isolated output from two identical secondary windings.

author: hkBattousai
author_rank: Regular Contributor
timestamp: October 01, 2014, 10:53:01 pm
content: This is a different representation of the circuit. It may make it easier to see how the circuit works.
Making the buzz sound of pulse width modulated fans disappear - Page 1
Forum section: electronics / beginners

author: canol
author_rank: Contributor
timestamp: March 30, 2014, 03:06:02 pm
content: Hello, I have a circuit which drives several fans using Arduino analog output and a MOSFET (IRFZ44N). The problem is that when I drive these 12V fans at, for example, 5V they make a very noticable and annoying buzz sound. Here is a video on Youtube showing the same sound problem:I want to make this sound disappear. Would using a motor driver IC instead of driving a MOSFET from Arduino solve the problem? Like for example L293D:http://www.ti.com/lit/ds/symlink/l293d.pdfOr are there other ways to do it?

author: matkar
author_rank: Regular Contributor
timestamp: March 30, 2014, 04:59:22 pm
content: One way is to use linear control. Downside are greater losses on the transistor, the positive side is the revolutions feedback wire gives exact RPMs.The other way is to increase PWM frequency to get above audible frequencies.

author: dc101
author_rank: Regular Contributor
timestamp: March 30, 2014, 05:04:57 pm
content: I can't tell from your video, but if you're not using it already, you need a low-pass filter on your PWM output. Check out this linkhttp://provideyourown.com/2011/analogwrite-convert-pwm-to-voltage/

author: TerminalJack505
author_rank: Super Contributor
timestamp: March 30, 2014, 06:58:58 pm
content: How embarrassing.LOL. That's my video.I was going to build a fan controller at one time and never did. I had heard about the noise that could be produced if you use PWM. At the time I couldn't find a video that demonstrated the noise so I decided to make my own.In addition to what's been suggested here, you might try a lower PWM frequency. A couple hundred Hertz or less. Supposedly, the noise is less noticeable.A switching regulator is another idea.If you go the route of using PWM at a frequency beyond the audible range then you'll likely have to put a fast-decay snubber across the fan's terminals. Otherwise the current will just 'freewheel' and the fan's speed will no longer be a (roughly) linear function of the PWM duty cycle.

author: rdl
author_rank: Super Contributor
timestamp: March 30, 2014, 07:00:45 pm
content: This may be helpful:Suppressing Acoustic Noise in PWM Fan Speed Control Systems

author: David Hess
author_rank: Super Contributor
timestamp: March 30, 2014, 07:05:24 pm
content: Keep in mind that the fan uses a DC brushless motor and its electronic commutation circuit is designed to work with a steady DC source although at low DC voltages, it may become noisy anyway.An LC filter on the output of the pulse width modulator like you would find on a buck switching regulator will solve this problem.

author: Zero999
author_rank: Super Contributor
timestamp: March 30, 2014, 08:10:01 pm
content: Quote from: dc101 on March 30, 2014, 05:04:57 pmA simple RC filter is only useful for low current signals.For higher currents, you need an inductor as well as a capacitor.

author: canol
author_rank: Contributor
timestamp: March 31, 2014, 01:36:11 pm
content: Thank you very much for your responses.
making thick and thin tracks wires in schematic/multisim - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: July 30, 2020, 01:58:40 pm
content: I am designing schematic in multisimI have to show high current and low current path in it. I searched but didn't find it.Any method to do it?

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: July 31, 2020, 11:04:21 am
content: .

author: perdrix
author_rank: Frequent Contributor
timestamp: July 31, 2020, 02:22:41 pm
content: You can define the minimum trace widths and the preferred layer for every net in the spreadsheet view at the bottom of the screen (select the Nets tab). You may need to use the View Menu to make the spreadsheet view visiblem.Or you can postpone these decisions until you layout the PCB in Ultiboard.David
Making ur own DRON! - Page 1
Forum section: electronics / beginners

author: girolamoo
author_rank: Newbie
timestamp: January 12, 2016, 09:28:41 am
content: So do you think it is possible, to make a dron by urself?

author: rs20
author_rank: Super Contributor
timestamp: January 12, 2016, 09:31:30 am
content: Do you mean a drone? Like a quadcopter? People buy motors, propellors, controllers and assemble their own quadcopters using 3d printed or balsa or carbon frames all the time.

author: AlxDroidDev
author_rank: Frequent Contributor
timestamp: January 12, 2016, 11:28:41 am
content: Quote from: girolamoo on January 12, 2016, 09:28:41 amYes. The first quadcopters were created by hobbists. Just after it became popular industries started selling them in building blocks or complete units.

author: Audioguru
author_rank: Super Contributor
timestamp: January 12, 2016, 07:02:20 pm
content: Will you control your drone with IR (infrared) or with RF (radio frequency)?The circuit of a drone is complicated, especially if you add gyroscopes. You could spend years designing one and a few more years debugging it.

author: m98
author_rank: Frequent Contributor
timestamp: January 12, 2016, 07:15:53 pm
content: Quote from: Audioguru on January 12, 2016, 07:02:20 pmHow are MEMS gyroscopes complicated to use by any means? Actually the hardware of a flight controller is quite simple. Software is much harder, as you need some quite advanced mathematics, but I'd think that its no problem for a hobbyist to complete such a project in a few month.
Making USB type C cable from adapter - Page 1
Forum section: electronics / beginners

author: Rutherford
author_rank: Newbie
timestamp: December 29, 2016, 01:32:11 am
content: I recently bought this USB 2.0 Type C > USB 2.0 type A adapter, my intention was to use iy with my Xiaomi MI5 as a Flash Drive reader.However the cable I bought doesn't appear to be OTG. I tried adapting this guideto my situation but I can't.The resistor on this cable is 5.07KOhms.Anyways here are some photos:http://imgur.com/a/95EbVIs this cable modification to OTG possible/reasonable or not.Thank you all, all feedback wellcome
Makita 18v USB voltage goes from 5v to 3v in seconds with no load.  OK w/ load - Page 1
Forum section: electronics / beginners

author: ez24
author_rank: Super Contributor
timestamp: February 07, 2018, 03:16:19 am
content: I got one of thesehttps://smile.amazon.com/Source-Makita-Li-ion-Battery-BL1815/dp/B0725LWR1L/ref=sr_1_1_sspa?ie=UTF8&qid=1517971745&sr=8-1-spons&keywords=adp05+makita&psc=1I hooked it up to fully charged batteries and connected a voltmeter to the USB post and the voltage started at 5.2v and immediately started dropping and within a minute it was around 3 v when I stopped the reading.At 50 ma it stays on and at 25ma it turns off.I want to use this as a portable PS. I also need 9v sometimes, so I will use a boost module from Aliexpress. Also I want 3v (or is it 3.3v ?) so I will use a 317 module.My guess this has something to do with a minimum current required by a buck but I expected Makita to design the circuit to stay at 5v regardless of current.So I will have to put a 100 ohm resistor across the battery (5v). Or 4 LEDs ?Is there any simple way to turn off this 50ma waste when the real load reaches 50ma ?thanks
male BNC to 5 mm scope probe adapter - Page 1
Forum section: electronics / beginners

author: rocksam
author_rank: Newbie
timestamp: November 12, 2024, 09:50:51 pm
content: I see a lot of sources for a female BNC scope probe adapter which people use to plug their probe directly into the signal generator, but I prefer a male BNC scope probe adapter that I can use on a BNC "T" ehich is connected to a BNC 50 ohm feedthru to the signal generator. Years ago these were common in electronics labs, now they seem to have disappeared. There are some on ebay (Chinese) but they are 4.5mm for some reason I don't understand. Does anyone know of a source for a male BNC to 5 mm probe adapter?
Malfunctioning kiln controller - Page 1
Forum section: electronics / beginners

author: arte.sea
author_rank: Newbie
timestamp: March 26, 2017, 10:20:24 pm
content: Hi everyone,I am complete novice with electronics and attempt to fix a very old (1981) kiln controller.This controller was already worked on by someone and work is not exactly professional. Generally device works, it shows valid temperature, it can be controlled from keyboard etc. the only problem is: Instead of solid bursts of power to coils inside of the oven it produces bursts of pulses about a second (on/off) each. This is not a correct behavior for this type of controller.Power to kiln coils is triggered using 2-stage relay system: A smaller relay inside of the controller triggers larger relay inside of the kiln. Small relay has 24v DC coil voltage, the terminal points coil are marked with yellow square on attached pic.When I look at electronics I see HEF4528BP Multivibrator that, if I am correct does precisely what it supposed to do and relay is triggered in precisely same frequency as output of HEF4528BP.Is that some kind of system where central CPU delegates actual heating logic to external IC?Please see attached pictures, as mentioned I have outlined relay coil terminal points in yellow and temperature probe input in green.Thanks

author: ebastler
author_rank: Super Contributor
timestamp: March 26, 2017, 11:10:47 pm
content: It seems that the company which designed that controller is still around;http://www.hermes-electronic.de/.Maybe worth a try to ask them for a schematic?
Malvino problem set solutions and Multisim files that accompany Pearson Textbook - Page 1
Forum section: electronics / beginners

author: watchmaker
author_rank: Unknown
timestamp: August 20, 2024, 11:41:49 pm
content: I have been tracking down the supplemental material to the textbooks I am using. Two links to what is publicly available at Pearson are below. These are helpful to those learning informally.https://media.pearsoncmg.com/ph/chet/chet_electronics_student_1/frames/datafiles/snyder_ess_multisim/snydermultisimfiles.htmlhttps://media.pearsoncmg.com/ph/chet/chet_electronics_student_1/frames/newbooks.htmlSolutions to Malvino problems (all) attached below
manson ep-613 dc power supply troubleshooting - Page 1
Forum section: electronics / beginners

author: howdyhoody
author_rank: Newbie
timestamp: June 13, 2014, 02:32:56 am
content: G'day everybody i'm an amateur electronics enthusiast and i've had a manson ep-613 for quite a while now but recently its failed one me. It has inbuilt current limiting that now wont turn off! I've checked all of the power transistors and they are fine it seems that its only the current limiter that is shot. Any help in trouble shooting would be amazing.Ill attach the manual for your information. The outputs positive and negative read 0.001 ohms so i think it may be a short.Thanks for any replies if i've formatted this incorrectly please let me know!

author: howdyhoody
author_rank: Newbie
timestamp: June 13, 2014, 03:53:54 am
content: Thanks for that mate! will do ill post results if i end up getting it working!not even sure where to start!

author: Shock
author_rank: Super Contributor
timestamp: June 13, 2014, 05:50:16 am
content: You should be able to contact Manson for the schematic they have good customer service.

author: howdyhoody
author_rank: Newbie
timestamp: June 13, 2014, 05:57:39 am
content: thanks for the help guys ! if i can work out how to reply to individual comments ill reply!
Manson Power Supply query - Page 1
Forum section: electronics / beginners

author: garymck
author_rank: Contributor
timestamp: May 19, 2017, 02:57:04 am
content: Hi,I have a DSE branded Q1760 Manson 30v 5amp power supply.I have found that the voltmeter on the front panel seems o be significantly off in it's indication of voltage by a around 2 volts.I believe the attached schematic indicates VR3 would adjust this? Correct?Since this is on the low voltage side of the transformer - would it be safe to power it on and adjust the pot to correct the calibration.Admit that as a beginner I'm a bit nervous! Or should I just bin it.....?cheersGary

author: danadak
author_rank: Super Contributor
timestamp: May 19, 2017, 10:52:26 am
content: VR3 does adjust the meter.Regards, Dana.

author: garymck
author_rank: Contributor
timestamp: May 19, 2017, 12:53:16 pm
content: Quote from: danadak on May 19, 2017, 10:52:26 amTook bit between my teeth and calibrated it. Now meter matches output.....Ended up with one screw extra left over when back together.... :-)cheersGary
Manual for Aron BS_601 oscilloscope - Page 1
Forum section: electronics / beginners

author: Ancientwhiz
author_rank: Newbie
timestamp: July 24, 2015, 08:01:11 am
content: I am looking for a manual for the Aron BS-601 analog oscilloscope, the japanese made model not the rebadged one. Can anyone help please?

author: tautech
author_rank: Super Contributor
timestamp: July 24, 2015, 08:31:34 am
content: Quote from: Ancientwhiz on July 24, 2015, 08:01:11 amWelcome to the forum.Good luck, I have a pair of BS-310's and I can't find any manuals either.If you find a source of Aron manuals, please let me know.Check my thread:https://www.eevblog.com/forum/testgear/aaron-bs-310s-cro-mini-teardowm/

author: cs.dk
author_rank: Unknown
timestamp: July 24, 2015, 06:01:44 pm
content: Quote from: Ancientwhiz on July 24, 2015, 08:01:11 amI've got one - Will have to fire the scanner upTheres some coffeespots on it, but it's readable.

author: Ancientwhiz
author_rank: Newbie
timestamp: July 25, 2015, 05:05:04 am
content: Hi cs.dk,Great news, these things are scarcer than hens teeth! I would really appreciate any bits you can salvage even the coffee spotsRegards-- Ancientwhiz hanleys2@westnet.com.au

author: cs.dk
author_rank: Unknown
timestamp: July 25, 2015, 10:04:28 am
content: Here is the scanned manual. A little crusty, but hope it is useful for you anywayCan't attach it on the forum, so here is a dropbox-link (PDF ~10 MB) -https://dl.dropboxusercontent.com/u/6429978/EEVBlog/ARON_BS-601.pdf

author: Ancientwhiz
author_rank: Newbie
timestamp: July 26, 2015, 10:10:17 am
content: Hi cs.dkMany thanks for that. I will get it out of dropbox tomorrow,been busy today with a birthday-my 86th.Thanks again Ancientwhiz

author: tautech
author_rank: Super Contributor
timestamp: July 26, 2015, 10:19:00 am
content: Quote from: cs.dk on July 24, 2015, 06:01:44 pmAdded to my archives.You might like to upload it to one of the manual sites,ko4bbfor example.

author: Ancientwhiz
author_rank: Newbie
timestamp: July 26, 2015, 02:20:54 pm
content: Hi again, All sorted now. this is brilliant,I can't thank you enough!!Ancientwhiz

author: HPJensen
author_rank: Newbie
timestamp: March 20, 2017, 12:35:58 pm
content: Hi guys,any chance the manual is still available?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: March 20, 2017, 06:11:18 pm
content: Quote from: HPJensen on March 20, 2017, 12:35:58 pmWelcome to the forum.In another recent thread mention was made that these are Hung Chang rebrands. A quick search found this which should let you find a source to download:Aron BS-601 Oscilloscope (Hung Chang OS-602) rebrand

author: pyorkie
author_rank: Newbie
timestamp: August 27, 2017, 04:02:23 am
content: HiI've got the original ARON BS-601 manual, has all the schematics diags etc .... did you still want a copy ..... I can scan it.pyorkie

author: cs.dk
author_rank: Unknown
timestamp: August 27, 2017, 07:24:28 am
content: It's still available on k04bb;http://www.ko4bb.com/getsimple/index.php?id=download&file=06_Misc_Test_Equipment/Aron_BS-601_20_MHz_Oscilloscope_Operator_Manual.pdf
Manual for Power Designs Inc. 2010? - Page 1
Forum section: electronics / beginners

author: groschen1936
author_rank: Newbie
timestamp: December 16, 2014, 06:52:06 pm
content: Looking for Electronic/Printed Manual for Model 2010

author: miguelvp
author_rank: Super Contributor
timestamp: December 17, 2014, 05:27:33 am
content: This threadhttps://www.eevblog.com/forum/testgear/looking-for-goodinexpensive-bench-power-supply/and this link might help:http://www.ko4bb.com/manuals/index.php?dir=09_Misc_Test_Equipment/Power_Designs

author: groschen1936
author_rank: Newbie
timestamp: December 17, 2014, 08:37:37 pm
content: Thanks miguelvp for the ko4bb manuals location!!It appears my 2010 is the same as the 2020 in operation and basic design with a current max of 1 amp instead of 2 amp! My older supply of 2005A (with an internal oven!) was covered exactly.
Manual for Samsung BD-H5100 Blu-Ray Disc Player? - Page 1
Forum section: electronics / beginners

author: TRAPTRAP
author_rank: Regular Contributor
timestamp: September 21, 2014, 08:02:11 pm
content: Some users have provided me with VERY helpful manuals for my other products, and since the subtitle fix didn't work on my last topic, I'm looking for manuals for other players. Can someone help me find that one?

author: miguelvp
author_rank: Super Contributor
timestamp: September 22, 2014, 04:23:41 am
content: Go tohttp://www.samsung.com/us/Click on the magnifying glass upper right for search.Type BD-H5100 and it will show the productClick on Owner's manual or manual in that screen and you'll get the pdf file.http://downloadcenter.samsung.com/content/UM/201401/20140123143913962/02401A_BD_H5100_ZA_1601_BK.pdfBut it seems that one doesn't have any subtitle positioning capabilitiesThis Philips seems to be able to do it:http://download.p4c.philips.com/files/b/bdp3100_05/bdp3100_05_dfu_eng.pdfPage 13QuoteAlso page 19 under preferences:QuoteThis one seems to be able to do it as wellhttp://download.p4c.philips.com/files/b/bdp2930_05/bdp2930_05_dfu_eng.pdfTheare re more selections here:US:http://www.usa.philips.com/c-m-so/blu-ray-and-dvd-players/blu-ray-player/latestUK:http://www.philips.co.uk/c-m-so/blu-ray-and-dvd-players/blu-ray-player/latestSelect one, then click support on the product and the user manual will be there.Once you open the pdf, search for subtitle

author: TRAPTRAP
author_rank: Regular Contributor
timestamp: September 22, 2014, 08:14:29 pm
content: Thank you, I'll take a look at them and see if they'll work. You're very helpful!I can't seem to find a place to purchase the first one you listed, but I found the second. They both look like they'll work, though. I wish I had a way to test it to be sure. Does anyone have either player? Or does anyone know a store that would let me test it?
Manual to Wattmeter B 4305 Siemens - Page 1
Forum section: electronics / beginners

author: Jasonbit
author_rank: Regular Contributor
timestamp: March 17, 2019, 05:49:25 pm
content: Hello Folks,I am looking for manual and videos to learn work with the wattmeter B4305 from Siemens. I can't find the manual on internet. I also tried to search here in the forum but without success.Can you help me?Thanks

author: Jasonbit
author_rank: Regular Contributor
timestamp: April 16, 2019, 04:50:03 pm
content: Hello everybody,Can anyone help me with this issue? I can't find documentation about how should I operate this equipment.Thanks
Manuals for old Test Equip, you name it they prob have - Page 1
Forum section: electronics / beginners

author: nrgeek
author_rank: Contributor
timestamp: January 25, 2012, 11:56:54 pm
content: The Boat Anchor Manual Archive has about every manual made in pdf form free , for old outdated bench and test equipment great archive !http://bama.edebris.com/manuals/This is a must bookmark .. heck Im tempted to suck em all down and keep my own archive in case this ever goes away !

author: elCap
author_rank: Regular Contributor
timestamp: January 26, 2012, 01:27:50 am
content: That one is already in the EEVblog wikihttp://www.eevblog.com/wiki/index.php?title=Service_manuals_and_repair_informationHere is another site that has many manuals for all kinds of equipment.http://elektrotanya.com/

author: nrgeek
author_rank: Contributor
timestamp: January 26, 2012, 02:25:38 am
content: Thank god for google translatorHungarian l
Manufacturer and model of this powersupply - Page 1
Forum section: electronics / beginners

author: Rob Sims
author_rank: Regular Contributor
timestamp: August 14, 2016, 01:29:23 am
content: Hi, anybody know the brand of this power supply??? It is used in a lab, see. It looks very reliable.

author: Brumby
author_rank: Unknown
timestamp: August 14, 2016, 01:47:34 am
content: Looks like the one on this page:http://electronics.stackexchange.com/questions/166518/parallel-connection-between-distinct-dc-bench-power-suppliesModel number: PS-5000No brand visible - and I can't confirm if it's ICEL (so far)

author: Brumby
author_rank: Unknown
timestamp: August 14, 2016, 01:54:03 am
content: The same box with two-colour LED displays...https://www.circuitspecialists.com/bench-power-supply-csi5505s.htmlThe specs offer 2 channels of 0-30V 3A and a fixed 5V 3A.This is stock standard for several dozen power supplies that are available in just about every corner of the world - whatever the brand or model number.

author: Rob Sims
author_rank: Regular Contributor
timestamp: August 14, 2016, 01:58:50 am
content: Yes it's a CSI. Thanks
Manufacturer logo - Page 1
Forum section: electronics / beginners

author: Apofview
author_rank: Contributor
timestamp: November 11, 2021, 05:01:23 pm
content: Hi,Identified short in two back to back diodes.Searched online but I was unable to find this manufacturer.I think they are zener diodes, found some similar schemes online.

author: Apofview
author_rank: Contributor
timestamp: November 11, 2021, 05:24:04 pm
content: Found logo on (https://www.s-manuals.com/smd):Taiwan semiconductorNTJ code is Surface Mount Transient Voltage Suppressor 190VSearching for thru-hole equivalent

author: Benta
author_rank: Super Contributor
timestamp: November 11, 2021, 06:28:27 pm
content: 190 V is rare.Closest would be P6KE180CA or P6KE200CA.

author: Apofview
author_rank: Contributor
timestamp: November 11, 2021, 08:00:15 pm
content: Tjank You Benta,Tomorrow will go to lokal shop to check availability.I'm tempted to test device without TVS diodes...

author: Apofview
author_rank: Contributor
timestamp: November 12, 2021, 02:49:05 am
content: NTJ ia actually min 190V max 210V and code is P6SMB200ASo equivalent is probably P6KE200CA

author: Apofview
author_rank: Contributor
timestamp: November 12, 2021, 08:11:31 am
content: Local shop has only P6KE250, protected cap is 250V rated...Can I use 200V zenner instead TVS diode?

author: Apofview
author_rank: Contributor
timestamp: November 12, 2021, 05:35:21 pm
content: Installed P6KE250CA, tested, device works 😁Ordered original part P6SMB200A, hope it will arrive in time ...TVS and zenner have different purpose, and are not interchangeable.
Manufacturing a reference design - Page 1
Forum section: electronics / beginners

author: ziggyfish
author_rank: Regular Contributor
timestamp: May 25, 2017, 05:44:42 am
content: Hi,I have found a TI reference design that does everything I need exactly. However, TI is selling it built for $300.My question is since TI has provided all of the resources in order to get the boards manufactured (Gerbers, schematics, BOM, assembly diagrams), is there any issues (legally or otherwise) in finding a PCB manufacturer to make the boards cheaper?ThanksBrendan

author: Seán
author_rank: Contributor
timestamp: May 25, 2017, 06:44:39 am
content: Can you actually make it cheaper? I would have assumed economies of scale with the product offered by TI.Anyway, I imagine you have two options, one would be does it say anywhere on the website/documentation that you not take the design and go build it yourself? And two, email them and ask.I would assume. Emphasis on the word assume, that since you have released the design, and since you would likely be buying ICs etc. from them, they might not have a massive issue.But wait for other answers to be sureSeán

author: Nusa
author_rank: Super Contributor
timestamp: May 25, 2017, 07:37:21 am
content: Quote from: ziggyfish on May 25, 2017, 05:44:42 amAmong those downloadable files is a "Reference Guide" that includes the legalese that completely answers your questions.The TL;DR version is that you're free to use and modify so long as it still uses the TI parts the design was created to support.
Mapping CRT Pin out without Schematics - Page 1
Forum section: electronics / beginners

author: Pyrodron
author_rank: Newbie
timestamp: March 16, 2018, 02:23:44 pm
content: Hello,I was wondering if it's possible to map the pin out of a CRT tube without the original schematics.I'm attempting to create an adapter to install an LCD monitor into a Scanning Electron Microscope that uses two CRTs to display information on.The CRT I'm trying to convert data from is a Toshiba LR30477 (if someone so happens to already have a schematic, research isn't turning up much; tried to reference a service manual from a Kaypro II).Any help would be greatly appreciated!

author: Ian.M
author_rank: Super Contributor
timestamp: March 16, 2018, 04:30:35 pm
content: To be clear, the Toshiba LR30477 is a monochrome CRT monitor (open chassis), not a bare CRT. Identify the signals in from the rest of the machine and scope them (after checking each signal is at a voltage is safe for your scope with a CAT III or better rated DMM). You are looking for video + H and V syncs. The syncs may be combined, but I'd bet on them being separate. There's a very remote possibility it may use composite video rather than separate syncs.If it uses a non-standard scan rate (i.e one not used by old PC monitors, TVs or arcade cabinets), you are probably S.O.L, unless you are up to designing your own FPGA based scan converter - but then you probably wouldn't be asking noob questions here.
MAR6 for GPS LNA - Page 1
Forum section: electronics / beginners

author: metrologist
author_rank: Super Contributor
timestamp: July 27, 2017, 06:55:51 pm
content: I was planning to use a MAR6 in a simple GPS LNA, like a LNA4ALL.I was just going to solder it to the end of the semi-rigid coax on my QFH antenna, with a 100n decoupling capacitor on the antenna side. Should I use a smaller value decoupling capacitor, any shunt capacitance, or series inductance on the output side?If this won't work, then I just want to fool my GPS because it detects that the antenna as it is (without the MAR6) is OC and it won't function., so how could I do that? Resistor across/instead of the cap? I think it just wants to see some current, but not sure how it's detecting a proper antenna.

author: metrologist
author_rank: Super Contributor
timestamp: July 30, 2017, 04:40:27 am
content: Well, this is what I made, both with a MAR6 and a MAR3 shown here. They don't work for my GPS antenna.I used this site (http://www.changpuak.ch/electronics/mar_era_bias.php) to get values, but am not using the supply circuit nor the receiver side decoupling capacitor because that feeds DC to the amp. Otherwise, would I need to use the supply circuit and connect the supply and output nodes together?

author: KE5FX
author_rank: Super Contributor
timestamp: July 30, 2017, 05:58:29 am
content: One thing to watch out for is oscillation, especially if you have a lot of wiring away from the ground plane as in metrologist's photo. MAR-6s have a lot of gain. If that preamp goes into an enclosed box of some kind, there's a good chance that it will jam somebody, somewhere.

author: metrologist
author_rank: Super Contributor
timestamp: July 30, 2017, 06:57:36 am
content: I think there is too much front end overload. I poked it with a spectrum analyzer and there are a lot of other signals. I was just using my scope probe, so couldn't see anything in the GHz range.The LNA4ALL sells for 20 euro with the SMA connectors.Anyway, this was just something to do while I wait for my Chinese GPS antennas. The MAR6 came from a scrap board and I cut out the entire section with the DC input components intact, so I could still use it as a general purpose LNA.Thanks for all the insights.
Marantz CR611 - Page 1
Forum section: electronics / beginners

author: Eddie53
author_rank: Newbie
timestamp: September 11, 2022, 09:21:29 am
content: Hello everyone. Does anybody know where I can obtain a Schematic for CR611 I am trying to repair my unit . No sound output??CheersEddie

author: rooppoorali
author_rank: Regular Contributor
timestamp: September 11, 2022, 03:14:59 pm
content: Could not find the circuit. But the user manual has some troubleshooting guidelines. Have you already tried those?
Marconi 2382 - Page 1
Forum section: electronics / beginners

author: keynaboutradios
author_rank: Contributor
timestamp: June 23, 2017, 11:14:10 pm
content: Hi everyone!I am new to electronics so be kind to me!!!!!Just bought my first ever Spectrum analyzer Marconi 2382/2380 really pleased with it, but trying to find a complete user manual so I can solve my problem, I have bought a attenuator for it, and trying to find out if it is possible to offset the attenuator value so I can read correct value on screen without having to deduct 30db from on screen value, hope that makes sense?ThanksJustin

author: xrunner
author_rank: Super Contributor
timestamp: June 24, 2017, 12:24:12 am
content: Is this it?http://www.opweb.de/en/model.php?id=13926

author: keynaboutradios
author_rank: Contributor
timestamp: June 24, 2017, 07:26:07 am
content: Thanks xrunnerI'm affraid not!, I have read that one, and it refers to chapter 3 for more detailed explanation on using, that one is chapter 1.Thanks for replying tho.
Marconi wattmeter. What's this feature here?? - Page 1
Forum section: electronics / beginners

author: Chris Wilson
author_rank: Super Contributor
timestamp: May 10, 2012, 11:59:53 pm
content: I bought a used Marconi TF2503 Wattmeter a while ago, and have been using it fine for some time. it has a feature that I am not familiar with though, and I would like to know what it is, an what it's for. The bes way to see it is via a photo. I am talking of the secondary meter that's marked "diode detection", and the "insert probe" knob. There's also a jack socket marked "MOD OUT". Can anyone explain what these are for and if they might be something I should be using?Thanks

author: jimmc
author_rank: Frequent Contributor
timestamp: May 11, 2012, 01:48:52 pm
content: If you are measuring the power of an amplitude modulated signal then you can use the diode detector to look at the modulation.No a great deal of use but handy to check if what you think is a CW signal has any unwanted AM on it or if you want to look at the rise and fall times as the RF is keyedThe probe part is effectively how tightly the diode is coupled to the signal.I'm not sure but I would suggest, set it for 100% on the meter to measure modulation.Set to zero when not using the diode to avoid overload and diverting power from the main wattmeter.Jim

author: Chris Wilson
author_rank: Super Contributor
timestamp: May 11, 2012, 03:15:30 pm
content: Is it a bit like a built in circuit similar to part of the one w2aew shows here:which I am about to build? If so I'll try scoping the output at the "mod out" jack and see what's to be seen! Cheers, thanks for the reply.
Marine grade shrink tubing - Page 1
Forum section: electronics / beginners

author: fixit7
author_rank: Regular Contributor
timestamp: May 08, 2019, 05:35:46 pm
content: I was looking for some shrink tubing.I saw some marine grade tubing.What is the difference between it and the reg. heat shrink tubing?

author: soldar
author_rank: Super Contributor
timestamp: May 08, 2019, 07:34:30 pm
content: From what I see it is lined with adhesive so it forms a better seal.https://www.amazon.es/Ancor-301506-Electrical-Adhesive-Diameter/dp/B000NI075M

author: fixit7
author_rank: Regular Contributor
timestamp: May 08, 2019, 11:45:02 pm
content: Thanks.
Marking codes of SMD components - Page 1
Forum section: electronics / beginners

author: Z. Khalid
author_rank: Contributor
timestamp: July 08, 2023, 07:52:52 am
content: Hello,What websites/references would you recommend using for decoding the marking code of an SMD component?

author: liaifat85
author_rank: Regular Contributor
timestamp: July 09, 2023, 12:48:30 am
content: These are some websites you can try:AllTransistors: alltransistors.comChipDocs:www.datasheetarchive.comSMD Code Book:www.s-manuals.com/smd

author: Nusa
author_rank: Super Contributor
timestamp: July 09, 2023, 05:13:40 am
content: Another:https://smd.yooneed.one/If you can identify the logo, often the makers site is a resource as well.

author: Z. Khalid
author_rank: Contributor
timestamp: July 09, 2023, 10:20:20 am
content: I have used the websites you mentioned with many other websites and code books. None of them was adequate.Concerning the IC manufacturer logo, it should be useful if it is available. Unfortunately, most of the components with SOT and SOD packages don’t have the logo printed on them, which is understandable.

author: oohroed
author_rank: Newbie
timestamp: August 03, 2023, 10:13:55 am
content: This is what I am looking for. Anyone have any suggestions?

author: lauryfriese
author_rank: Newbie
timestamp: November 01, 2023, 10:06:30 am
content: This is very helpful.

author: Dpwoc
author_rank: Newbie
timestamp: August 28, 2025, 01:05:49 pm
content: Thanks for sharing these! I usually check SMD Code Book and AllTransistors, cause it's super handy for quick decoding

author: Z. Khalid
author_rank: Contributor
timestamp: August 29, 2025, 07:15:42 pm
content: Identifying the part number of an unknown SMD component remains a common and often complex challenge for engineers and technicians. One of the primary difficulties arises from the lack of standardisation in SMD marking codes. These codes vary significantly across manufacturers, and in many cases, a single marking may correspond to multiple components depending on the specific manufacturer and package type.Unfortunately, many online resources are incomplete, outdated, or contain inaccuracies. As a result, relying solely on these databases can lead to incorrect component identification.In my opinion, a critical step in the identification process is determining the general type of the component—such as whether it is a transistor, diode, voltage regulator, or passive element. This functional categorisation significantly narrows the range of possible part numbers and enables more focused verification strategies.More often than not, I use the analogue signature analysis (Huntron Tracker) to confirm the accuracy of the identified part number by comparing the electrical signature of the unknown device to that of a known good component..
martek power ps2328 48volt server power supply  - Page 1
Forum section: electronics / beginners

author: Baldbentley
author_rank: Newbie
timestamp: October 24, 2023, 09:09:20 pm
content: I have a martek power ps2328 server power supply. It is a 48v power supply. I was able to get the power supply to work but it is outputting 54 volts. I have the pinout attached in the picture below. Is there a voltage sensing pin that will regulate the output voltage to 48v? Is there a simple way to regulate the voltage to 48v. I am trying to power a charger that will except a maximum of 50v.Thanks for the help

author: donlisms
author_rank: Frequent Contributor
timestamp: October 25, 2023, 02:05:28 am
content: It's difficult to say. The datasheet is not exactly complete and unambiguous. There are some possible indications that at 42 amps, the voltage is 48.2 volts, but at 0 amps, the voltage is 54 volts. That would explain what you're seeing. But the datasheet is... not clear. (Which in itself is a bad sign, since the only purpose for a datasheet is to be clear about how the thing behaves.)It would be nice to know what voltage it puts out at some other load, being careful to manage the 2000 watts of power the specs suggest. It's hard to imagine that much power being needed for a charger of any kind, but... hey, what do I know?To me, at least with the experiences of my own life, I might call it "the wrong power supply." That's because it's probably too big and too powerful and too, well, dangerous, to fit into any projects I could imagine doing. I don't know what you're up to!

author: Baldbentley
author_rank: Newbie
timestamp: October 25, 2023, 04:19:33 am
content: It seems strange that being a server power supply it would vary the voltage that much weather under load or not. The charger is a 2 channel charger for large batteries capable of 1400w on a single channel or 2000w both channels combined. I am hesitant to plug in the charger to the power supply since it is rated to 50v input. It could be an expensive test. You may be right, the data sheet I uploaded isn't very clear but shows 0.5 amps under the 54 volt column and 42 amps under the 48.2 volt column so maybe if the amp draw exceeds 0.5 amps it will drop the voltage to 48.2 volts. Do you have any recommendations of a good way to test this? I don't have much of anything to load test with that takes 54 volts.
MARVELL's IC datasheet (88e6161-lg02) - Page 1
Forum section: electronics / beginners

author: alamwte
author_rank: Regular Contributor
timestamp: March 02, 2022, 11:01:36 am
content: Hello,I am looking for 88e6161-lg02 IC datasheet. But I always have problem with finding MARVELL's ICs.Do you know how can I find the 88e6161-lg02 datasheet?Thanks,

author: Bassman59
author_rank: Super Contributor
timestamp: March 02, 2022, 08:51:06 pm
content: Quote from: alamwte on March 02, 2022, 11:01:36 amMarvell generally requires customers to sign an NDA prior to providing a data sheet, so ... nobody will give one to you.

author: alamwte
author_rank: Regular Contributor
timestamp: March 03, 2022, 04:54:03 am
content: OKThanks
Mastech HY3005D-3 - Page 1
Forum section: electronics / beginners

author: JohnF
author_rank: Newbie
timestamp: April 06, 2017, 08:56:12 am
content: Hello everyone, I have a Mastech dc power supply HY3005d-3 and I have this problem.When in independent mode, on the first channel everything is fine. On the second channel the output voltage I have is 1,7V on screen and some millivolts on multimeter.What shall I check first? I'm new in electronics.Thank you in advance

author: MrAl
author_rank: Super Contributor
timestamp: April 06, 2017, 09:45:50 am
content: Hi,You could check and see if there is a reverse connected diode across the output that has shorted out.Just one guess out of many though, but i have seen this problem in another Mastech.

author: JohnF
author_rank: Newbie
timestamp: April 06, 2017, 11:40:06 am
content: thank you for the reply MrAl, that was it.

author: macboy
author_rank: Super Contributor
timestamp: April 06, 2017, 03:31:36 pm
content: No matter what size of diode was there originally, use a 3A or bigger diode (like 1N5401) to replace it. These diodes will sometimes be required to conduct at the full output current of the supply when you use both supplies in series, and if current limiting occurs.
Mastech HY3005F-3 trips 20A breaker. - Page 1
Forum section: electronics / beginners

author: freak
author_rank: Contributor
timestamp: February 22, 2022, 09:26:38 pm
content: I purchased a Mastech HY3005F-3 power supply. It typically works fine but maybe 50%-75% it trips a 20A breaker with nothing else connected to it. Reset the breaker and then it's usually ok. It has a toriodal transformer and is connected on the secondary entirely with plug connectors. I disconnected all secondaries and powered up and the breaker still trips. I have used two different circuits/breakers and am not overloaded on either. I removed three MOV's which two were parallel to the each side of the switch (but I cannot see how a MOV failure here could cause a problem) and a third which was across line/neutral. Still trips the breaker. Could the circuitry on the secondary side somehow limit the inrush current and there is a failure there or is inrush always limited on the primary side? If so there's really nothing there to do it. I appreciate any tips.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 22, 2022, 09:30:54 pm
content: Large (e.g. > 100 VA) toroidial transformers sometimes do trip a normal mains fuse. They can have quite significal inrush current as the core can be driven all the way to saturation. Ideally there should be some extra circuit to limit the inrush current: this could be a NTC inrush limiter or a resistor and relay to bridge the relay after a few 100 ms.

author: freak
author_rank: Contributor
timestamp: February 23, 2022, 12:39:56 am
content: Is it as simple as selecting the right NTC limiter and putting it in series with the transformer?

author: Kleinstein
author_rank: Super Contributor
timestamp: February 23, 2022, 08:41:25 am
content: With lower power ( < about 300 VA) just a suitable NTC and a suitable environment (allow the NTC to run relatively hot without damage) should be enough.
Master SPI to nonSPI slave. - Page 1
Forum section: electronics / beginners

author: Kemme
author_rank: Contributor
timestamp: May 31, 2015, 04:31:59 pm
content: Hello allI am trying to connect LPC1114http://www.nxp.com/documents/user_manual/UM10398.pdfto this LCDhttps://www.maritex.com.pl/media/uploads/PRODUKTY_PDF/con/LGMTG12864R6PFLW.pdfI decided to use serial interface of the LCD. Knowing the time characteristics:I decided to use SPI interface on the LPC1114 (MOSI to SI, SCK to SCL and MISO and SS unconnected plus three other connections to control A0, RES and CS1). Anyway it is not working. I know that the LCD does not have SPI controller but in my opinion it should work.Am I missing something? Do you think it is possible to control nonSPI slave with SPI master? Or maybe I messed something else up and that's why it is not working?

author: zapta
author_rank: Super Contributor
timestamp: May 31, 2015, 05:14:21 pm
content: A logic analyzer such as the Saleae 8 (original or a clone from ebay) will allow you to see what's really going on there.
.mat file to csv conversion - Page 1
Forum section: electronics / beginners

author: Karamel
author_rank: Regular Contributor
timestamp: April 07, 2018, 05:50:31 pm
content: Hi,I am trying to convert .mat file to csv on Matlab. It is very simple but I am getting an error csvwrite command.Mycodes,Code:y = load('data.mat');csvwrite('test.csv', y);csvwrite line gives this error : Error using csvwrite (line 2) Undefined function 'real' for input arguments of type 'struct'.However, my .mat file have no any problem. Each cells has a variable which are real number.Why does Matlab give this error?

author: Karamel
author_rank: Regular Contributor
timestamp: April 07, 2018, 06:04:08 pm
content: I loaded manually (with clicking data.mat) file to workspace. After that, immediately, problem has been solved.
Matching a coil to ... an OP-amp? - Page 1
Forum section: electronics / beginners

author: 0pss
author_rank: Newbie
timestamp: March 16, 2024, 03:28:13 pm
content: Hi everyone,I am trying to build an Instrument, a "CRTelecaster" inspired by the band "Electronicos Fantasticos":They way I figured this works is there is some user-input controlling a function generator, the output being displayed on the screen. A coil is held against the glass of the screen and is inductively coupled the the coils controlling the electron beam inside. The Signal picked up by the coil is then amplified and played on a speaker.I got most of the stuff working, made a touch sensitive PCB Fingerboard, use an ESP32 for function generation and designed my first variable gain Amplifier to amplify the outgoing audio signal like so:using a LM358 (since I did not want to bother with symmetrical supply) as a non-inverting amp and a 20k potentiometer and a 20k resistor as R1. And this works great, when I tested it amplifying music coming from a headphone jack (low frequencies are rattling a bit, but still pretty clear)BUT, when plugging in the coil and trying to pick up the fields emitted by the CRT, it is super noisy!- the coil is just a random length of wire with a random ammount of turns at this point- obviously it is picking up some Stuff like AC, and other radiowaves- but it is still extremely noisy when put in a metal case- I noticed the noise- characteristics change when I soldered a resistor in line with the coil (not sure if it got "better" tho)Do I need to somehow match my coil to my amplifier?So if anyone could recommend some terms to look up or maybe even has an Idea how to get rid of most of the noise other than using a bandpass, that is very much appreciated!Thank you

author: CaptDon
author_rank: Super Contributor
timestamp: March 17, 2024, 02:03:30 pm
content: Any clues or online links to the circuitry used in the original design? The display on the screen just looks like the audio frequency fed into the video input? Not sure if video modulation provides a real function in the feedback circuit or if it just 'Looks cool' and the only real feedback obtained by the coil is the proximity to the huge magnetic field generated by the horizontal yoke winding at the N.T.S.C. or P.A.L. sweep frequency? The horizontal magnetic field when sensed externally to the actual monitor is very strong and it is very easy to then filter out the low frequencies of power line interference as well as the much lower vertical sweep frequency. The amplified and then rectified sense voltage coming from the coil may drive a very simple Voltage Controlled Amplifier such as found in / on synthesizers.