hybridfree/eevblog-posts huggingface dataset:
Fender Champion 100 guitar amp (component identification etc) - Page 1
Forum section: electronics / repair

author: cowasaki
author_rank: Frequent Contributor
timestamp: October 09, 2019, 09:06:45 pm
content: Just borrowed a Fender Champion 100 guitar amp which worked at his house as he was showing me the best settings. On arrival at my house I plugged it in and there was an almighty crack and a flash and it took out the electrics.I've restored everything and now looking at the amp. The bridge rectifier is blown which is a GBU806 and I've ordered a few to collect tomorrow morning from CPC. After that there are two components which have basically vaporised these are the capacitors C358 & C356. C357 & C359 appear to have survived.As yet I've not managed to find a service manual.Anybody have a schematic for it or know where I can get one?

author: cowasaki
author_rank: Frequent Contributor
timestamp: October 10, 2019, 04:10:37 am
content: I've found that the power module is the same across several models....C356-C359 are SMD capsThey are shown asC357.015630VWhat value is that? I can't find that value or voltage rating. Am I reading it all wrong?PDF of schematic for the board is attached and the components are in the top left of page 2.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 10, 2019, 06:25:54 am
content: 0.015 uf or 15 nanofarads at 630 voltssomething like theeseshttps://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/MLCCs-Multilayer-Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-bkrdv?P=1z0wps5Z1yp7zipZ1yzmotuZ1yx6r6bhttps://www.mouser.com/Search/Refine?Keyword=GRM31CR72J153KW03L&FS=True

author: Shock
author_rank: Super Contributor
timestamp: October 10, 2019, 06:40:48 am
content: From the schematic the unlabelled caps appear to be in uF so .015uF or 15nF fits.
Fender Frontman 212R: DC output  - Page 1
Forum section: electronics / repair

author: EugenioN
author_rank: Contributor
timestamp: May 01, 2023, 10:03:39 pm
content: Hi all!I'm fiddling around a Frontman 212R, plauged with the infamous "pop/crackle" sound caused by mute circuit.While powering for initial testing, somemagic smokeescaped from R84 and output went to -30(ish)V. I then disconnected the muting circuitry snipping out R74 to simplify the troubleshooting.This is the situation: R84 is blowing out because 85mA are flowing through. After some measures, this current path should be the one depicted in red:Q10 base-emitter is reverse biased (-3ish V), even if U6-A is doing his best to keep the base positive.Every single diode and transistor is looking fine when probed for base-emitter and base-collector diodes, and this makes me going nutsHints?PS: sorry for these vague measurements, I need to quickly turn on mains supply, take a look at the bench multimeter, then turn off before R84 will burn with flames and fumes.

author: Kim Christensen
author_rank: Super Contributor
timestamp: May 01, 2023, 11:31:24 pm
content: I'm a little confused by some of the values marked on your schematic. Like R87, R88, R89 & R90:What does the "Fu" mean?ie: R87 is Fu470... Is that 470 ohms? Or something else?The smokey current through R84 could be coming from 2 places. Q11 or Q10... You could check the voltage drop across R86 to estimate the current through Q10. It should be zero if Q10 is operating correctly since you mentioned that it's base-emitter is reverse biased. That being Ok would leave Q11 as the next suspect.

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 02, 2023, 04:23:44 am
content: Hi!"Fu" followed by a number indicates a "fusible" type resistor, indicated in ohms!Apart from Q11 s/c base–to–collector being the obvious path for excess current to flow, part of the current should be carried back to the –42V rail via R89 and diodes D25, D26 and D27.This type of circuit is difficult to analyse component–by–component because of the direct coupling between all the transistors, and you may have one or more of the various fusible resistors damaged from the original short–circuit!I would begin by checking all the "Fu".prefixed resistors for any damaged or open–circuit ones, followed by the 1N4448 diodes ('4148s will also do!), and make certain you've not got any other defective transistors, you'll to check them ALL between the diff amplifier stage Q9/Q10 all the way up to Q21, out of circuit!Chris Williams

author: EugenioN
author_rank: Contributor
timestamp: May 28, 2023, 02:55:09 pm
content: Q11 was the offending one.Despite measuring ok with simple on circuit junction check, it was definitely not ok when biased at full voltageAfter replacing with another bjt (similar specs, not the exact part) everything went ok.It was populates quite high with respect to the pcb, "hanging in the breeze" with long leads; it was the only one mounted this way: all its siblings were close to the pcb surface.Maybe some vibrational stress caused its premature degradation.Thank you for your help!
Fender Rumble 100 mystery - Page 1
Forum section: electronics / repair

author: 4cx10000
author_rank: Regular Contributor
timestamp: August 27, 2022, 04:29:33 pm
content: Hi!I am currently repairing a Fender Rumble 100 bass amplifier. It was completely dead when it came in and what I found was a shorted diode - minus side - in the mains rectifier bridge and a blown 1206 zero ohm on the bottom side of the pcb. Now … this zero ohm resistor, that was blown, was connected from the heat sink of the switching transistor, see schematic, and to ground. My humble question: why would you do that?

author: TheMG
author_rank: Frequent Contributor
timestamp: August 28, 2022, 02:07:09 pm
content: Probably for EMC reasons. They used the zero ohm resistor so they decide whether or not to connect it, depending on results of pre-compliance testing most likely.It's actually very common in a lot of SMPS for the heatsink to be connected to the negative of the bulk capacitor (primary side circuit gnd reference). Even with the switching device isolated from the heatsink, at operating frequency the capacitance between the device and heatsink is significant enough to cause the heatsink to become a source of EMI.I would guess either something shorted against the heatsink, or the insulation of the thermal interface broke down.

author: 4cx10000
author_rank: Regular Contributor
timestamp: August 28, 2022, 03:02:52 pm
content: Thank you TheMG for taking your time to explain this circuit!When I read your post it all fall in place, thank you!Either one of the things you mentioned or that the short on the minus side of the bridge rectifier caused, if I would guess, a high potential relative switching transistor to the mains ac voltage and the result, an insulation breakdown. I will have to check the insulation for breakdown and if that happened - most probably as you also stated - I will post it here.

author: 4cx10000
author_rank: Regular Contributor
timestamp: August 28, 2022, 03:24:47 pm
content: Well well ... under the microscope it looks like this!
Ferranti ZSS84B ? - Page 1
Forum section: electronics / repair

author: tridac
author_rank: Regular Contributor
timestamp: August 17, 2024, 03:31:08 pm
content: Hiu,Not sure if this is the right group, but trying to find data on a Ferranti ZSS84B IC, in a 10 pin TO99 hermetic low profile can, Searched web, but data sheets for older Ferranti semicondutors seem a bit thin on the ground. Any ideas ?.Thanks,Chris

author: suntime
author_rank: Contributor
timestamp: August 17, 2024, 04:01:20 pm
content: Hi,You can find all the info in the next link:http://bitsavers.informatik.uni-stuttgart.de/components/derivationAndTabulationAssociates/1977_DATA_Interface_Integrated_Circuits_Edition_2.pdfSee:Page 42, line 45 & 46Page 157 - logic/block drawingsPage 515 - outline drawings

author: tridac
author_rank: Regular Contributor
timestamp: August 17, 2024, 04:48:38 pm
content: Thanks for that. Other Ferranti data books there as well...
Ferrite transformer - Page 1
Forum section: electronics / repair

author: NOON Design
author_rank: Contributor
timestamp: January 26, 2021, 02:31:12 am
content: Hi, as you can see I managed to drop and break the ferrite 'cover' for this inductor while repairing it. I can see a bazillion different types of ferrite transformer bobbins etc but nothing like this. Can anyone help me with search terms to find this style of ferrite transformer part? OD of the inner section is 15mm.Alternatively would a ferrite bead/tube of 15mm ID give me approximately the same inductor characteristics? Out of an audio eq circuit so precise value isn't critical but reasonable matching of characteristics to neighbouring inductors is desirable.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 26, 2021, 04:26:13 am
content: Can just glue the fragments back on, assuming it's not so many pieces this becomes impractical. Superglue is good.How many pins are connected? If only two, and you can guess the value (you can measure it too, but it will probably now be higher than intended, if it's not completely broken I mean), and it's near a common commercial value, you can replace it. If more, good luck.If it still  works, and you know the value it needs to be or can tune it (based on circuit response?), just put a chunk of ferrite beside it, and glue it in place where it gives the right value. e.g.https://www.digikey.com/en/products/filter/ferrite-disks-and-plates/843FYI: a transformer has more than two pins. An inductor has exactly two pins. (Sometimes "coupled inductor" is used as well, which is a type of "transformer".)Tim

author: NOON Design
author_rank: Contributor
timestamp: January 26, 2021, 10:08:54 am
content: It shattered into many small pieces, impractical to glue it back together. I put it back into the circuit without the cover and it seems close enough guitar purposes.

author: shakalnokturn
author_rank: Super Contributor
timestamp: January 26, 2021, 11:58:47 pm
content: Occasionally you'll come across an inductor with an added magnet when a less linear response is wanted.May this be the case here as it's for "guitar purposes"?
Festoon bulb 24mm x 6mm 12v - Page 1
Forum section: electronics / repair

author: Audiorepair
author_rank: Frequent Contributor
timestamp: February 24, 2022, 11:43:44 am
content: Hi,trying to find this 24mm x 6mm 12v 1.2W festoon bulb to no avail.It's inside a VU meter.Anyone know the manufacturer that makes these, or part number to search for?I could solder in a substitute but would rather just get a stock of these bulbs for third party replacement.Hmm, that's weird, I intended the photo to be rotated 180, but when I tried uploading a rotated version it was just the same!

author: themadhippy
author_rank: Super Contributor
timestamp: February 24, 2022, 11:54:21 am
content: Old skool car interior lamphttps://www.cp-lighting.co.uk/6X24-12V-1-2W-100mA

author: Audiorepair
author_rank: Frequent Contributor
timestamp: February 24, 2022, 12:19:28 pm
content: Ah, thanks, that's excellent.Don't know why I couldn't find that.I'll try a search later on and see if it can find this thread!

author: Haenk
author_rank: Super Contributor
timestamp: February 24, 2022, 07:29:06 pm
content: Try "soffitte" for a start
FET equivalent ideas? - Page 1
Forum section: electronics / repair

author: Tangent_Tracker
author_rank: Regular Contributor
timestamp: April 11, 2022, 12:48:38 pm
content: I have a s/c P type mosfet from a faulty torch but I am struggling to find a replacement! Looks like it is in buck mode, and this feeds the lamp, SOT23 and it will have to be able to supply an amp I'd think..Any ideas?

author: gamalot
author_rank: Super Contributor
timestamp: April 11, 2022, 02:45:38 pm
content: AO3407Ahttp://www.aosmd.com/pdfs/datasheet/ao3407a.pdf

author: Tangent_Tracker
author_rank: Regular Contributor
timestamp: April 11, 2022, 03:38:37 pm
content: Thanks! Can I ask which databook you found it in?

author: gamalot
author_rank: Super Contributor
timestamp: April 11, 2022, 05:43:27 pm
content: Quote from: Tangent_Tracker on April 11, 2022, 03:38:37 pmhttps://smd.yooneed.one/code5837.html

author: fzabkar
author_rank: Super Contributor
timestamp: April 11, 2022, 09:28:47 pm
content: http://www.smdmark.com/en-US/search/code?id=X7xx
FG1617  Frequeny Generator - Page 1
Forum section: electronics / repair

author: TOMOMKEG
author_rank: Newbie
timestamp: June 06, 2023, 06:54:28 am
content: I was given this frequency generator which is not working. Display works but there is no output. Frequency Control Circuit seems very simple , still I can not figure out why there is nothing on pins 7 or 1 of IC 101? I did change IC 101 and 102, and C 101 and C 102... I lifted R106, still no signal ( on oscilloscope). Perhaps someone can help or give a hint? I have attached relevant part of diagram and faceplate. Thanks, Tomo.

author: m k
author_rank: Super Contributor
timestamp: June 12, 2023, 02:41:14 pm
content: Have you checked that P01 is not shorted all the way and IC101 pin 5 active?
FG502 no output [SOLVED] - Page 1
Forum section: electronics / repair

author: Warsp
author_rank: Contributor
timestamp: April 22, 2023, 06:44:03 pm
content: Hello.I recently go a FG502 function generator but it only produces a negative voltage on the output. I believe the cause for there being no waveform may be the Q230A, B comparator in the triangle generator, but I am unsure since it appears to work fine after testing it in circuit with my component tester. As for the negative voltage on the output I am assuming its probably something to do with the output amplifier, but I have no idea whats wrong with it. So far what I have done is replacing the out of spec carbon comp resistors and replacing a burnt resistor and neighboring transistors in the power section. Any help is appreciated.

author: m k
author_rank: Super Contributor
timestamp: April 27, 2023, 06:50:30 pm
content: There is a switch for different modes.If all modes are missing then the problem is more likely later than that switch.

author: Kleinstein
author_rank: Super Contributor
timestamp: April 28, 2023, 07:02:09 am
content: I would suspect the output amplifier, as this part is exposed to external events, like extra voltage or ESD. Some of the old designs also ran relatively hot.It should be possible to probe the signal before the final amplfier, e.g. at the function selection.The old output amplifiers used rather fast medium power transistors (e.g. TO39 case) which by now may be hard to get (and no easy alternative). So one should be a bit careful with just replacing burnt resistors as this may cause more damage. Most damages transistors fail short - so one can find them relatively easy with a incircuit test. One the downside this also often means that they can cause more damage to other parts. I would test all the transistors in the output section for a short. If possible the test under power would be with a limited current supply and than frist looking at the DC levels.

author: David Hess
author_rank: Super Contributor
timestamp: April 29, 2023, 12:26:18 am
content: Quote from: Kleinstein on April 28, 2023, 07:02:09 amReplacements were a problem even 30 years ago, although they may still be available through Central Semiconductor for a premium price. The closest modern parts might be audio VAS transistors which do have the advantage of low capacitance, like the KSA1381/KSC3503 and KDA1142/KSC2682. If I was designing a modern replacement, I might use a pile of fast but lower power transistors in parallel.

author: Warsp
author_rank: Contributor
timestamp: May 06, 2023, 04:58:37 am
content: Found the problem. Turns out Q230 wasn't the culprit but it was actually its socket, which I failed to notice when I initially trouble shooted it, which explains why I couldn't find any shorted transistors. As for the output amplifier, it seems that it is now behaving itself now that the triangle generator works. I bought some replacement transistors anyway just in case it breaks in the future since they weren't too pricey. I am going to replace the filter caps and do a calibration on the function generator and after that it should work fine. Thanks for your help.
FGY75N60SMD equivalent  - Page 1
Forum section: electronics / repair

author: TobiasG
author_rank: Contributor
timestamp: November 19, 2023, 03:54:39 pm
content: Hello allCould you help me one more time?The FGY75N60SMD is obsolete, I need discover a equivalent, but I didn't find. Then please do you know?

author: fzabkar
author_rank: Super Contributor
timestamp: November 19, 2023, 08:14:52 pm
content: Digikey suggests IGW100N60H3FKSA1 as a direct substitute.https://www.infineon.com/dgdl/Infineon-IGW100N60H3-DS-v01_02-en.pdf?fileId=db3a30433a747525013a9270ef6b17cbhttps://rocelec.widen.net/view/pdf/slahnehzg4/FAIRS47644-1.pdf?t.download=true&u=5oefqw

author: TobiasG
author_rank: Contributor
timestamp: November 19, 2023, 08:33:38 pm
content: Hi Fzabkar,thank you for you answer.I have one question about your indication,is missing a free well diode.

author: fzabkar
author_rank: Super Contributor
timestamp: November 19, 2023, 10:33:38 pm
content: Sorry, hopefully someone can suggest a better match.

author: wraper
author_rank: Unknown
timestamp: November 19, 2023, 11:01:02 pm
content: AOK75B60D1 for example.https://aosmd.com/res/data_sheets/AOK75B60D1.pdf

author: Vovk_Z
author_rank: Super Contributor
timestamp: November 20, 2023, 05:46:01 pm
content: STGW80V60DF, STGWT80V60DF.Octopart helps with suggestions.

author: Jwillis
author_rank: Super Contributor
timestamp: November 23, 2023, 08:25:23 am
content: https://www.littelfuse.com/media?resourcetype=datasheets&itemid=8d50aaf0-8c87-41e3-b261-8d96cd4071ed&filename=littelfuse_discrete_igbts_xpt_ixxh75n60b3d1_datasheet.pdf

author: TobiasG
author_rank: Contributor
timestamp: January 12, 2024, 02:13:04 pm
content: tks all
20W pulsed IR fiber laser fiber severed - Page 1
Forum section: electronics / repair

author: baltersice
author_rank: Regular Contributor
timestamp: August 19, 2019, 12:15:41 pm
content: Hi, Electronics Experts!I've set foot on some new terrain recently ...I am always surprised by your universal knowledge, so I thought I'd post this here and hope for some input, in spite of it not being electronicshttps://imgur.com/a/G5l5SpTI got a ~20W fiber laser by SPI Lasers, UK. Someone snipped off the fiber to save a few minutes in the disassembly of some larger bit of kit.I'd like to try and fix that, but my experience is limited and I'd like to hear a few opinions before messing things up even more.I don't think there is an internal coupling anywhere - the fiber probably goes from the guts of the laser all the way out through the armored cable to the termination. So I think I have to do some splicing.Will that work for such a <500kHz 20W IR pulsed laser? Or will a splice in that fiber cause a lot of chaos and internal reflections n stuff?I have an older Sumitomo 36 fusion splicer and some crappy Chinese cleaver. I've attacked the fiber with a scalpel and was able to scratch off some cladding easily, so I think it is a polymer cladding that I can remove with acetone.The cladding outside diameter is 300 µm, I don't know what the core diameter is yet, but it's probably a bit more girthy than an average telecoms fiber for which the Sumitomo splicer was designed?It should probably be able to handle that anyway I expect?I've purchased some FT200EMT to practice before messing around with the important fiber.But to progress in the disassembly (to flip out the top level) I have to release some length of fiber from that slanted spool in the last photo. And I am a bit scared of that ...does anybody know why that slanted spool is there and why it's different from the loosy goosy arrangement next to it?It feels important and easy to mess up ...
Filtering SMPS for noisy computer  - Page 1
Forum section: electronics / repair

author: cleanworkbench
author_rank: Regular Contributor
timestamp: May 02, 2020, 07:37:21 am
content: I have a problem with radio interference from the computer PSU. Make is ATX 500TDAs per usual the mains input filtering components are missing . So what are the values for the caps and toroid windings or the toroid colour , wire diameter and turns count . I either solder in to the PCB or build a small board and fit inside the box. And what about the DC o/p filtering.Anyone done this here please ?Thanks

author: David Hess
author_rank: Super Contributor
timestamp: May 02, 2020, 08:04:07 am
content: I would tend to add an existing line input filter module rather than designing one from scratch; they are not expensive. They are also available with an IEC connector for using standard power cords if a panel mount is acceptable.

author: cleanworkbench
author_rank: Regular Contributor
timestamp: May 02, 2020, 08:14:55 am
content: I take your point but i have loads of components here .

author: ogden
author_rank: Super Contributor
timestamp: May 02, 2020, 08:40:56 am
content: This is safety-related job which requires qualification. Either you are skilled enough to do the job w/o askign questions in the public forum or you are not qualified. Install premade AC mains line filter (if any) or better buy new PSU ensuring that it has EMI filtering and sell existing one.

author: TheMG
author_rank: Frequent Contributor
timestamp: May 02, 2020, 05:04:35 pm
content: Quote from: cleanworkbench on May 02, 2020, 07:37:21 amAre you saying the filtering components inside the PSU itself have been omitted?That's a sign of a cheap piece of junk PSU. Likely other corners have been cut too, so it's probably not going to be an efficient or reliable PSU either.I would just get a better quality PSU.

author: wraper
author_rank: Unknown
timestamp: May 02, 2020, 05:25:05 pm
content: The best would be to replace it with decent quality PSU instead of investing your time and money into piece of junk. Crap PSU have significant chance damaging computer hardware and they are inefficient. Usually price difference between crap and good PSU will turn the other way around when counting electricity cost difference over computer lifetime, so you will pay more instead of saving. You may think that power consumption difference of something like 20W is nothing, but say when used for 8 hours a day, it's 58 kWh per year, multiply by 23.8 euro cents per kWh and it's 14 Euro annually. Not to say they also usually have poor standby PSU efficiency as well which adds up as well.

author: cleanworkbench
author_rank: Regular Contributor
timestamp: May 02, 2020, 09:02:54 pm
content: Its the usual trick for cost cutting , leave out EMI components , its served me well but i thought i would pop the lid for a look see and sure enough , two toroids and three caps missing. I have another psu ready to go in but want to see if i can get the RFI down or completely gone.
Find a replacement relay by pin spacing? - Page 1
Forum section: electronics / repair

author: 5ubtle
author_rank: Newbie
timestamp: June 23, 2023, 10:15:32 pm
content: Hi all, First post.I want to identify a replacement SPDT relay based upon it's mechanical properties (pin spacing). I don't find this as a search parameter at Newark.How can I find a relay with the pin locations as shown in my attached sketch? This will be a repair part for a 30 year old garage door opener. There are no markings on the relay (no manufacturer, no PN, no logo, nothing). Coil voltage is 24VDC. Contacts need to control 1A at 120VAC.

author: floobydust
author_rank: Super Contributor
timestamp: June 23, 2023, 10:20:54 pm
content: That is a standard package relay. But nothing in a garage door opener is rated only 1A.They are typically cube relays like OmronG5LE-1-DC24or Song Chuan 833H-1C-C 24VDC sealed, I have not tried Songle as a cheap replacement.I change all 3 - lights, motor fwd, rev. for the amount of hassle it is.

author: 5ubtle
author_rank: Newbie
timestamp: June 23, 2023, 10:35:01 pm
content: I have 0.6 inch between the pins along the long axis. The relays you suggested have 0.5 inch on that dimension. Is that "as close as I will find"?

author: floobydust
author_rank: Super Contributor
timestamp: June 23, 2023, 11:30:03 pm
content: Double check the measurement, I've never seen a longer relay in that form factor and with no markings or part number.

author: 5ubtle
author_rank: Newbie
timestamp: June 23, 2023, 11:32:36 pm
content: Quote from: floobydust on June 23, 2023, 11:30:03 pmThe measurement is correct.

author: pickle9000
author_rank: Super Contributor
timestamp: June 23, 2023, 11:42:26 pm
content: Looks like a standard automotive footprint.

author: floobydust
author_rank: Super Contributor
timestamp: June 24, 2023, 12:19:19 am
content: It's a longer cube relay with the extra 0.1" and that might be done for extra isolation voltage or current rating.But sorry no luck at all finding one. Tried a search looking at the relay size such as overall length. It would have to be longer than the standard cube relay's 20-22.5mm.TE Connectivity,they have bought out many old relay manufacturers and have the oddballs. But their website is a form of hell.I'd just extend the coil pins on a standard cube relay it if can be done without creating a spacings/safety issue.

author: squadchannel
author_rank: Frequent Contributor
timestamp: July 23, 2024, 07:38:22 am
content: Quote from: floobydust on June 24, 2023, 12:19:19 amThe TE catalog is easy to understand.For power relays:https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1-1773969-4&DocType=DS&DocLang=English&DocFilename=ENG_DS_1-1773969-4_2002.pdfIn the case of relays, there is usually a "de facto standard" package.

author: floobydust
author_rank: Super Contributor
timestamp: July 23, 2024, 07:00:22 pm
content: I didn't see anything by TE in that catalogue that matches OP's oddball 0.6" spacing. Even the Schrack stuff (which is from Mars) they use their own distinct oddball package most of the time.
Find Connector Replacement - Page 1
Forum section: electronics / repair

author: ryanwhite04
author_rank: Newbie
timestamp: July 20, 2021, 05:41:42 am
content: Hi,I'm looking for a connector to replace the one in the image below but I can't find the name of brand anywhere.I've checked all the connectors on the molex website so I don't think it's molex.It's 10 pin, square post, 2.54mm pitch, right angle.

author: ryanwhite04
author_rank: Newbie
timestamp: July 20, 2021, 06:22:04 am
content: Nevermind, I found them.For anyone wondering, it's the Samtec .100" Mini Mate® Isolated Power Connector Terminal StripIPS1-105-01-L-D and the IPT-105-01-L-Dhttps://www.samtec.com/products/ipt1-105-01-l-d

author: ambrosia heart
author_rank: Regular Contributor
timestamp: July 20, 2021, 06:25:34 am
content: search the name or buy at taobao.连接器 = connector.弯脚 = bended legs/pins公头 = male plug母头 = female plug¥44 for 200 pcs.

author: Twoflower
author_rank: Frequent Contributor
timestamp: July 20, 2021, 07:23:49 am
content: Be careful. the original seems to be keyed. To me it looks that the lower row has rounded corners to protect wrong insertion direction and/or mating with wrong connector.
Find the noise data with the noise source probe MODEL 125E - Page 1
Forum section: electronics / repair

author: allenw
author_rank: Newbie
timestamp: November 16, 2023, 09:15:54 am
content: Hi anyone,Who have the noise list data for noise source with part number is 125E, freq range is 0.01-4GHZ. and company is Magnetic AB. thanks!Allen
Finding a replacement boost converter IC - Page 1
Forum section: electronics / repair

author: hns0
author_rank: Newbie
timestamp: April 13, 2023, 06:15:23 pm
content: I'm trying to repair an old 1990s camera with a dead 5V boost converter circuit.The switching controller chip, IC201 in the schematic, is a Ricoh RS5RM5045B, which isn't available any more. I'm hoping for either a drop-in replacement or to make a small bodge board to patch in a new 5V regulator circuit.The Ricoh chip has a couple differences from other boost converters I've seen. There's an active-low CE pin to turn on the 5V boost on Vout, and when it is high (disabled), it passes through the 3V battery Vin directly to Vout. So the main CPU is powered by 3V Vin in standby, and boosted 5V when switched on.Does anyone know of a regulator IC with this functionality? Any advice would be much appreciated!!

author: wraper
author_rank: Unknown
timestamp: April 13, 2023, 06:34:23 pm
content: RS5RM5045Ais still available and should work just fine.https://www.utsource.net/sch/RS5RM5045A.htmlhttps://www.aliexpress.com/item/1005003634032023.htmlQuoteEDIT: seems you will need to bodge a schottky diode from Vbat to VOUT so VOUT still will have voltage when CE input is disabled.

author: hns0
author_rank: Newbie
timestamp: April 13, 2023, 08:11:27 pm
content: Great idea to use the A version with a schottky diode. I will give this a try. thanks!
Finding a replacement for a Zener diode  - Page 1
Forum section: electronics / repair

author: Fuzz
author_rank: Newbie
timestamp: October 21, 2024, 06:29:56 pm
content: HiI am trying to repair a battery charger and i came across a faulty Zener diode in the pcb. There's just a green bar on the divide. How do i know what to replace it with?Thanks

author: fzabkar
author_rank: Super Contributor
timestamp: October 21, 2024, 07:03:57 pm
content: Can you upload a photo of the PCB, with a zoomed shot of the area around the zener? You may need to trace the circuit to determine the function of the zener.
Finding a replacement part SL6NG - Page 1
Forum section: electronics / repair

author: knightly
author_rank: Newbie
timestamp: April 05, 2024, 02:35:07 pm
content: Hi all,I'm trying to repair a 5Ghz Wifi amplifier.The part I'm trying to replace is SL6NG (shorted)This part sits on the 5V rail and is being used to bias the output transistor.Can anyone help me identify a replacement?See attached picture.Thanks,Bob

author: fzabkar
author_rank: Super Contributor
timestamp: April 05, 2024, 10:33:17 pm
content: https://ae01.alicdn.com/kf/S5bcfc51f4ea0464dac9383b3cba98120W/5-sztuk-SGM3204YN6G-TR-SL6-SOT23-6-Brand-New-and-original.jpg(SGM3204YN6G photo)https://www.sg-micro.com/uploads/soft/20211209/1639041870.pdf(SGM3204YN6G datasheet)Quote
Finding a similar replacement for an older rocker switch - Page 1
Forum section: electronics / repair

author: toli
author_rank: Frequent Contributor
timestamp: November 06, 2021, 03:26:27 pm
content: I've got an older TTi lab power supply (PL330QMT) whose power switch is no longer working. The original part number (61115916, DPST switch) seems to be from this series:https://www.carlingtech.com/rocker-switches-611-621-seriesI've attached a couple of pictures at the end of this post too.I have other switches of similar size that can be used with the same cutout of the front panel. However, before I replace it with something different, I'd like to see if I can have something that would also look identical to the original.Anyone has any idea where (if) a direct replacement, or something that will be as similar as possible could be found?Thanks.EDIT:

author: Renate
author_rank: Super Contributor
timestamp: November 09, 2021, 06:55:00 pm
content: Paddle switches seem to have fallen out of favor.If you instead look for rocker switches in 0.5" x 0.75" you'll see a zillion of them for less than $5.The good thing is that when you eventually find your heirloom switch it will only take you 5 minutes to swap out anyway.
Finding correct SMT diodes and transistors to fix my scope? - Page 1
Forum section: electronics / repair

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: July 01, 2024, 11:52:59 am
content: Im trying to fix the front end on one of the channels of my scope, from what I can tell the transistors and diodes in this pic are the problem... doing resistance and diode tests in circuit gives crazy values compared to the other three channels.So far I have figured out one transistor is going to be a 2sk508-52 jfet, and it is definately bad, out of circuit a transistor tester reads it as 2 resistors!The other three transistors labeled 3em with a sideways 4? are some sort of MMBTH10's but the sideways 4 is throwing me off I think they may be MMBTH10−04LT1G's but I am not sure.... The weird thing is in circuit only one leg of all three transistors was testing strange compared to the other three channels, using diode drop and resistance on a DMM, so I took them out. Oddly out of circuit diode drop/resistance tests doesn't work at all, the dmm says overload, but the transistor tester shows everyone with a VBE of 700mv and 6na IC.The two diodes are labeled C1, I think they are NXP 43v zeners, but I'm not sure. I need to put my power supply back together because I don't have any other 50v source to test them with.

author: wraper
author_rank: Unknown
timestamp: July 01, 2024, 12:22:41 pm
content: QuoteMMBTH10LT1G from Onsemihttps://www.lcsc.com/product-detail/Bipolar-Transistors-BJT_onsemi-MMBTH10LT1G_C16204.htmlQuoteDatasheet says date code orientation depends on manufacturing location.Quote2SK508G-K52 to be precise.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: July 01, 2024, 02:02:58 pm
content: Any idea if those two c1 diodes above the jfet are NXP zeners?

author: wraper
author_rank: Unknown
timestamp: July 01, 2024, 03:12:35 pm
content: ^Could be thishttps://www.lcsc.com/product-detail/Zener-Diodes_Nexperia-BZX585-B2V4-115_C503445.htmlI suggest desolering one from a working channel if both of these are actually dead and checking if it's actually a 2.4V Zener diode. Multimeter might be enough for the test if it can measure a relatively high voltage in diode mode.

author: tautech
author_rank: Super Contributor
timestamp: July 04, 2024, 11:31:46 pm
content: @OPI have some warranty replacement boards I can pull and test/check components if required.Let me know the DSO models.
Finding diode and repairing nissan car radio - Page 1
Forum section: electronics / repair

author: Edumcg
author_rank: Newbie
timestamp: April 08, 2020, 05:41:44 pm
content: Hello,I'm trying to repair my nissan car radio model: Clarion BTS33The problem began when the fuel volumen line of my car shortcircuited with 12V. As soon as that happened my radio turned off and never came back again. I sent the radio with some folks to repair it, they replaced some ICs that were burned out but they couldn't replace one specific diode.Right now, when I plug the radio into my car only the screen shows up but it prints nothing. Just a blank orange screen. No audio output no matter what buttons I press.I found the cable on Amazon:https://www.amazon.com/20-pin-Subaru-Headunit-Harness-Steering/dp/B01D9K3L44I also found the user manual of the radio:https://fccid.io/2ABGYBTS33-CLARION/User-Manual/User-guide-2150158The only component that looks burned out is the diode D402. The diode is the same as de diode D403 so I can see the marking is "C308" the 08 is fllipped to the right 90 degress.My plan is to replace the diode but I haven't been able to find a datasheet.I've attached images of the radio and the circuit board. Any help would be appreciated.Thanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: April 08, 2020, 09:17:50 pm
content: first i would measure the d403 part in diode mode to see if you have only 2 pins used : like cathode anode, test it forward and reverse to see if you have a junction voltage and nothing in the reverse, that way youll find anode and cathode on the 3 pins, but if its an transisor you'll find a common point who'll give you 2 junctions voltages and nothing in reversenormal or reverse mean changing the red and black tip when you measure things ...you can google transistor and diode checkup ...Since its marked "dxxx" it should be an diode like in4148 in sot-23 packageI see you posted here toohttps://www.element14.com/community/thread/75454/l/diode-identification-and-car-radio-repair

author: Manul
author_rank: Super Contributor
timestamp: April 08, 2020, 11:09:31 pm
content: My bet would be 1SS226.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 09, 2020, 02:46:34 am
content: possible only a diode test will tell if the op is able to do so
Finding Equivalent Op-Amp (National Semiconductor Part) - Page 1
Forum section: electronics / repair

author: The13thParish
author_rank: Contributor
timestamp: June 08, 2021, 08:20:34 pm
content: Dear all,I'm trying to replace two op-amps in a Phillips Scientific Wideband Amplifier that was good up to 1 GHz (Model 6954). An issue I am facing is that this company seems to have disappeared last year so I cannot find a datasheet online. I wish I'd saved it previously, but alas . . .The op-amps are National Semiconductor ones in an SOIC-8 package with the numbers 1678 on one line and 742 on the second line of the package. Both op-amps have identical part numbers. I understand that NS was bought out by Texas Instruments in 2011. Does anyone know what an equivalent part number would be? It seems like a stab in the dark here . . .All the best,Ryan

author: fzabkar
author_rank: Super Contributor
timestamp: June 08, 2021, 08:34:38 pm
content: Are you sure it's an NS part?https://www.analog.com/media/en/technical-documentation/data-sheets/16789fs.pdfhttps://www.mouser.ca/datasheet/2/286/upc1678-1186874.pdfhttps://www.ti.com/lit/gpn/OPA1678<-- this is an audio amp, so it is probably the wrong fit for your applicationEdit:I think that uPC1678 is the only good fit for a wideband amplifier.

author: The13thParish
author_rank: Contributor
timestamp: June 08, 2021, 08:37:54 pm
content: The package has the squiggly N logo of National Semiconductor. I don't think I could have misidentified it for the LT logo.If indeed you have found the ones I am after, what does the '742' refer to on second line of the packageI have? Do I not also need this to match up with the part numbers you have found?

author: fzabkar
author_rank: Super Contributor
timestamp: June 08, 2021, 09:18:39 pm
content: Quote from: The13thParish on June 08, 2021, 08:37:54 pmIt's normally a YWW (Year/Week) date code, ie week 42 of 2017 or 2007 or 1997. You should find similar codes on the other chips. Some may be in YYWW format.Here is a repository of NS databooks:https://mirrorservice.org/sites/www.bitsavers.org/components/national/_dataBooks/

author: fzabkar
author_rank: Super Contributor
timestamp: June 10, 2021, 08:48:00 pm
content: Quote from: The13thParish on June 08, 2021, 08:20:34 pmhttps://confluence.desy.de/download/attachments/129394950/6954ds.pdf?version=1&modificationDate=1566481777124&api=v2

author: The13thParish
author_rank: Contributor
timestamp: June 29, 2021, 01:26:22 am
content: fzabkar,I wanted to say thanks: the UPC1678 op-amp was the one that I needed and the pre-amplifier now works again like a charm.All the best,Ryan
Finding pots for Tektronix 2205 scope - Page 1
Forum section: electronics / repair

author: larrybud
author_rank: Contributor
timestamp: May 05, 2023, 06:43:51 pm
content: I would like to replace the pots for the hor/ver position dials, and the other front panel pots. I cleaned them, and they "work" but the value of the pots moves pretty wildly just when barely touching the knob. I suspect the "springiness" of the contacts inside are losing their luster.I have the values of the pots, there's only 2 unique ones, and I have the manufacture part number out of the service manual, but I have no idea how to find these. They obviously need to fit the pin layout AND for the knob to fit inside one. Any help would be appreciated:Pot 1: PP1700HGA0A4110 (10K 0.2W)Pot 2: PP17/000HFAQA234 (470 OHM, 0.2W)They appear to be the same except for the value.

author: PwrElectronics
author_rank: Regular Contributor
timestamp: May 05, 2023, 07:36:49 pm
content: Looks like the datasheet for those can be found here:https://www.datasheetarchive.com/pdf/download.php?id=d173222a191887dcc8af9091d0182e1d862f78&type=O&term=753504%252F02%252Fpp17Made by Mepcopal. Searching for that company only seems to turn up random vendors with some perhaps old stock parts and didn't find mfg website (but I did not search too hard).You may need to dig through product offerings of mfg of pots looking to find something matching.Another possibility is this place has them:https://www.sphere.bc.ca/test/tekparts.htmlGood luck.EDIT: I did find some reference to Mepcopal being acquired by BC Components and BC is now part of Vishay. Mepcopal apparently was a joint venture of Phillips and Copal back when. Looking at Vishay products I didn't see anything looks like what you have though.EDIT #2: I must be bored this Friday afternoon... So, found this BC Component catalog from 1999. Look on pages 140 and 141. Those look a lot like your parts. But, renamed series/pns...https://xonstorage.blob.core.windows.net/pdf/cgi-bin/PDF/Phycom/BCC.pdfSearching on CRC17 and MRC17 modules turns up some hits too but not sure if these are available other than old stock either.

author: larrybud
author_rank: Contributor
timestamp: May 06, 2023, 12:44:10 pm
content: You da man! Thanks for your time! The MRC17 looks exactly like it.What did you search to find it?
Finding replacement bypass caps on gpu - Page 1
Forum section: electronics / repair

author: Robertkopp
author_rank: Newbie
timestamp: September 29, 2021, 10:27:57 am
content: I got a gtx660ti with 2 missing 805 mlcc caps. They are in a line with another cap of the same size, so I de-soldered that one and measured it with the capacitance test of my dmm (10uf).But how can I be sure about the voltage rating? All caps I find in that package size with 10uf are 10, 25 and 50v.

author: DavidAlfa
author_rank: Super Contributor
timestamp: September 29, 2021, 02:30:48 pm
content: Measure the voltage when powered on.Probably they're connected to very low voltages, 1.1-3V or so, so any 6.3V will work.Of course a 16V one would work too, but size and cost will increase.

author: Robertkopp
author_rank: Newbie
timestamp: September 29, 2021, 04:26:29 pm
content: Thank you David.
Finding schematics of a CDMA phone - Page 1
Forum section: electronics / repair

author: Rishles69@
author_rank: Regular Contributor
timestamp: June 24, 2024, 02:32:04 pm
content: So I Got this CDMA telephone from LG. The model number is LSP-350. I'm trying to find it's schematics as this pcb has lost some of the components. Is there any way to recognize it or find the schematic for this?

author: geggi1
author_rank: Frequent Contributor
timestamp: June 24, 2024, 02:40:06 pm
content: Looking at the PCB it either got a water damage or had an over voltage.It is most likely not repairable.My suggestion is to find a replacement phone.Had a quick google on the internet and you can get desktop mobile phone for about 50$ online.Just getting the parts it your phone was repairable is most likely more than 50$.

author: Rishles69@
author_rank: Regular Contributor
timestamp: June 24, 2024, 02:46:01 pm
content: It's wax actually, the pcb has never touched water. The pcb saysSPFY0084001LSP-350 MAIN|lss| 1 |Rev .| |Guess that helps you.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 24, 2024, 03:03:44 pm
content: even with schematics, this board is badly tampered withlot of stuff missing, not worth the hassle to fix that, but its up to you, and you ll know in the end it will not be worth it cost / parts and time put in thisfor schematics, none have leaked i did not found anything ..

author: Rishles69@
author_rank: Regular Contributor
timestamp: June 24, 2024, 04:22:20 pm
content: I do have every ics for it but it's missing transistors and resistors. How can I find it ?
Finding similar laptop schematics - Page 1
Forum section: electronics / repair

author: keerthi123
author_rank: Contributor
timestamp: September 18, 2020, 12:43:24 am
content: Hi all,Schematics are mostly not available for repair. As an exmple, I am trying to troubleshoot a HP Pavilion Touchsmart 23 (board is IPIVB-AT). Is there any way to find a most closest available schematic? May be from Original design manufacturer (ODM) or any other.Really appreciate the input from experts here.

author: fzabkar
author_rank: Super Contributor
timestamp: September 18, 2020, 12:49:04 am
content: Have you looked here?https://elektrotanya.com/showresult?what=Touchsmart&kategoria=All&kat2=All
Finding SMD Component - Page 1
Forum section: electronics / repair

author: ieee1396
author_rank: Newbie
timestamp: July 27, 2021, 10:09:46 am
content: Hey,Short story:I've been passed over an MSI B450I to carry out a board repair on after someone knocked off some components, I am having real issues locating one of the packages on the board!I'm fairly its power related due to it's location on the board and there are multiples of them but any help is really appreciated.This is the component I am trying to trace:The code is:S0T2Z939As it's power related (I think) I can likely source one that isn't completely mangled, this seems the best option as I can't even locate a donor board at the moment!Thanks in advance hoping to solve this issue.

author: bykivi
author_rank: Newbie
timestamp: July 31, 2021, 05:16:15 am
content: Maybe?http://www.upi-semi.com/files/1446/534b3d7f-b441-11e9-8d44-d30dc7bf67c5

author: MathWizard
author_rank: Super Contributor
timestamp: August 01, 2021, 12:27:52 am
content: So where is it on the mobo? Is it some gate driver chip for the buck converters for CPU voltages ?This reminds me I have 1-2 old mobo's, 1 is somehow broken for sure. But I guess I can't investigate them much without a processor, or other things things to plug into it.
finding suitable mosfet substitute - Page 1
Forum section: electronics / repair

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: March 19, 2023, 12:40:08 am
content: Hi guys,I am repairing an old instrument that has all the pwoer mosfet gone..I have to find suitable replacement for the PSU.1) The old one is 2SK2372 and the substitute will be IXTQ26N50P-ND2) The old one is 2SK2488 and the substitute will be IXFH12N100P-NDDo you think that they will work? I had a limited choice because I have to order another ton of components and this are the only one that I think that are right.Both mosfets are the used in a switching PSU.

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: March 19, 2023, 08:30:25 am
content: Can anyone help please?

author: DeepLink
author_rank: Regular Contributor
timestamp: March 19, 2023, 08:49:07 am
content: Also found these alternativesFor 2SK23722SK3522FMH23N50EIRFP460For 2SK2488FMH09N90E

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: March 19, 2023, 09:21:52 am
content: Quote from: DeepLink on March 19, 2023, 08:49:07 amUnfortualy the only options I have are the one I listed, no one of all the above mentioned MOSFET are available, only the IRFP460 but the VGSS is +-20 instead of +- 30 of the original.What do you think about the replacement I found?

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 19, 2023, 01:51:44 pm
content: * 30n60 * MOSFEThttps://www.mouser.es/c/ds/semiconductors/discrete-semiconductors/transistors/mosfet/?q=30n60SiHP30N60EFCP130N60IXTH30N60P...

author: DeepLink
author_rank: Regular Contributor
timestamp: March 19, 2023, 03:49:26 pm
content: The 2 alternatives you mentioned is comparable with the original typesWhen used in SMPS, you have to look at capacitance, gate charge and timing as well as the "normal" parameters like Voltage, Current
Can't find the right size strain relief bushing - Page 1
Forum section: electronics / repair

author: onedumbquestion
author_rank: Contributor
timestamp: August 25, 2019, 01:56:13 pm
content: I'm trying to replace the power cord on a JVC RX-307 It seems the mounting hole dimensions are 12mm x 11mm (flat sides) and I haven't been able to find the right strain relief bushing

author: pbarton
author_rank: Frequent Contributor
timestamp: August 25, 2019, 08:02:24 pm
content: Have you checked Heyco out?https://www.heyco.com/Strain_Relief_Bushings/

author: onedumbquestion
author_rank: Contributor
timestamp: August 27, 2019, 05:50:14 pm
content: Yes I never could really figure out the sizing from the data sheets but I bought some Heyco 5N-4 and 4N-4's hope one of them will fit