hybridfree/eevblog-posts huggingface dataset:
What is this PCB vendor asking? - Page 1
Forum section: electronics / projects

author: robertbaruch
author_rank: Regular Contributor
timestamp: January 12, 2018, 03:48:02 am
content: I sent in a PCB to a vendor in China that really looks over the design for potential problems. Usually I can figure out what the problem is, but this time I'm pretty stumped. Does anyone have any idea what they are asking for?"second, these places on the solder mask layer will be opening wholely or will be fabricated as the green oil bridge?"And they included a pretty low-resolution image:

author: sleemanj
author_rank: Super Contributor
timestamp: January 12, 2018, 03:58:06 am
content: They want to know if you require soldermask between the fingers (pads) on tha connector, or if they can just remove soldermask from that entirely.Thin soldermask slivers can be a problem."Green oil" = soldermask

author: TimNJ
author_rank: Super Contributor
timestamp: January 12, 2018, 03:59:24 am
content: If I had to guess, they are asking if you want to pull back soldermask between the pins of the ICs and your card edge connector.For instance, most PCI (and similar) cards do not have solder mask between the connector. Just bare FR4.Edit: Ah yes, beat me to it.

author: robertbaruch
author_rank: Regular Contributor
timestamp: January 12, 2018, 04:13:17 am
content: I think I see. They're objecting to the ultrathin soldermask between the fine pitch pins. That makes sense.Thanks all!

author: robertbaruch
author_rank: Regular Contributor
timestamp: January 12, 2018, 05:23:03 am
content: Hmm. I removed the soldermask from the pads, and they came back with the exact same question. I still don't know what "green oil bridge" is.Here is what my original KiCad file looked like:In KiCad the purple stuff is solder mask clearance. I thought that was supposed to be the area to keep the solder mask OUT of. What I don't understand is, if they're objecting to solder mask between the pins, why aren't they paying attention to the solder mask clearance?

author: SeanB
author_rank: Super Contributor
timestamp: January 12, 2018, 07:01:18 am
content: They are asking if you want tented vias?

author: bson
author_rank: Unknown
timestamp: January 12, 2018, 08:44:47 am
content: Quote from: robertbaruch on January 12, 2018, 05:23:03 amIf I were to make a wild guess, they want to know if your via should still be tented so your solder doesn't drain down it, or should they honor the mask and leave it untented (I doubt they can tent half of it as shown).

author: amyk
author_rank: Super Contributor
timestamp: January 12, 2018, 11:04:01 am
content: It is worth asking for the Chinese sentence too, because you might be able to find a better translator (like some people here) than the one they use.Page 20 of this shows "green oil bridge" as being "soldermask bridge":https://wenku.baidu.com/view/90f993784b73f242336c5fd0.html
What is this plastic dingus called? - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: June 17, 2020, 03:49:06 am
content: The clip that holds the tiny circular helitrim pots on the PCB?These pots are about 6mm in diameter. Attached is a picture of two of these little guys on a very dusty 1S2.I've searched for holder, clip, and pcb mount. Nothing.I'm also asking on Tekscopes but it's so much easier to attach pictures here...

author: andy3055
author_rank: Super Contributor
timestamp: June 17, 2020, 06:02:57 am
content: I believe it is listed in the service manual as "HOLDER, variable resistor." Page: 9-10. Several other places has the same ref.

author: mikerj
author_rank: Super Contributor
timestamp: June 17, 2020, 10:48:05 am
content: Probably a custom part. You might find something suitable in the automotive sector, this kind of thing is often used for clipping pipes etc. to metal panels.

author: MLXXXp
author_rank: Frequent Contributor
timestamp: June 17, 2020, 06:11:13 pm
content: Could you get away with a small cable tie holder and tie?https://www.digikey.ca/en/products/detail/panduit-corp/TM1A-M/4569096

author: DaJMasta
author_rank: Super Contributor
timestamp: June 17, 2020, 06:33:57 pm
content: Looks like it was probably designed for the pots in question, and I don't know of availability now. A prime candidate for 3d printing, but as mentioned a replacement with similar functionality but different looks probably isn't hard to come by.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: June 17, 2020, 06:57:16 pm
content: I think I might just give up for now, it is surely not that important... Just irritating.

author: max_torque
author_rank: Super Contributor
timestamp: June 17, 2020, 07:06:40 pm
content: it could be a repuprosed pipe clip!You can get plastic pipe clips for things like car brake pipes, which are around 1/4" / 6mm in diameter?
What is this strange device I see? When I touch it, it gives forth a sound??? - Page 1
Forum section: electronics / projects

author: mkiijam
author_rank: Regular Contributor
timestamp: February 17, 2024, 01:29:05 am
content: This strange thing is in an Acetone Drum machine from the 60's

author: ataradov
author_rank: Super Contributor
timestamp: February 17, 2024, 01:49:18 am
content: Likely a transistor. Probably a FET of some sort, they came in funky packages like this. Later high frequency devices were packaged in a similar way, but if it is 60's, I doubt it is anything special.RF amplifiers are also commonly packaged like this, but I see no reason for that in a drum machine. And the rest of the design is clearly far from RF.

author: mkiijam
author_rank: Regular Contributor
timestamp: February 17, 2024, 02:02:20 am
content: It's possible it isTR1

author: ataradov
author_rank: Super Contributor
timestamp: February 17, 2024, 02:10:26 am
content: If two pins go to a transformer and the other one to a variable resistor, then yeah. So, it is just a regular BJT.

author: moffy
author_rank: Super Contributor
timestamp: February 17, 2024, 02:48:54 am
content: Looks like a VHF transistor I once tried to use for a fibre optic amp at University using someone elses SPICE design, it was unconditionally unstable.

author: moffy
author_rank: Super Contributor
timestamp: February 17, 2024, 03:34:49 am
content: A smaller version of this:https://www.time-tunnel.com.au/electronics/spare-parts/transistors/motorola-hf-rf-power-transistor-mrf421-100w/The case is possibly beryllium oxide and toxic in dust form.

author: MarkT
author_rank: Frequent Contributor
timestamp: February 17, 2024, 10:37:36 am
content: Looks like a dual-gate MOSFET - can be used for ring modulation which might have a role in a drum machine. The white body may be beryllia (toxic dust hazard) or alumina, indicating its an RF device.
What is this thing? Wire to board connector. - Page 1
Forum section: electronics / projects

author: BMK
author_rank: Regular Contributor
timestamp: September 18, 2025, 11:29:13 pm
content: I have to interface with this connector on a project. I cannot seem to identify.20 position, wire to board.. both parts pictured.Pitch is 0.95 based on measument of 20 pins.. 19mm/20pins could be some close inch value 0.0375"?Appreciate any help.

author: thm_w
author_rank: Super Contributor
timestamp: September 19, 2025, 12:07:07 am
content: Looks similar to Hirose DF19G-20P-1H though thats 1mm pitch.Is there no logo on the metal shield?

author: BMK
author_rank: Regular Contributor
timestamp: September 19, 2025, 12:34:14 am
content: Yes indeed. Tiny HRS stamped there..But I am very sure the pitch is not 1mm..But I am now sure I cannot count..

author: thm_w
author_rank: Super Contributor
timestamp: September 19, 2025, 12:45:23 am
content: You measured between centers of 20 pins right?19mm is a 1mm pitch for 20 pins.

author: BMK
author_rank: Regular Contributor
timestamp: September 19, 2025, 01:15:58 am
content: Yes.And I'm leaving my stupidity here for others amusementThank you.DF19 is the one.
What is this toroid looking part? - Page 1
Forum section: electronics / projects

author: geratheg
author_rank: Regular Contributor
timestamp: July 22, 2014, 08:46:09 am
content: I initially picked this up from a hacker space assuming it's a toroid, and could not find any specs for it.It has 4 terminals, which I assumed would be connected to each other in pairs.Measuring resistances didn't help, they all showed some resistance about 1.5k ohms.What can this component be?The number of the component reads NA-25 0125I googled it, but I'm not sure what I'm looking for.

author: bktemp
author_rank: Super Contributor
timestamp: July 22, 2014, 09:00:36 am
content: It looks like a current sensor: The 4 pin device seems to be a hall sensor.

author: amyk
author_rank: Super Contributor
timestamp: July 22, 2014, 09:41:41 am
content: Was GooglingNA-25 datasheettoo hard?

author: geratheg
author_rank: Regular Contributor
timestamp: July 22, 2014, 11:04:44 am
content: Quote from: amyk on July 22, 2014, 09:41:41 amIt actually was, I don't know what the component is and how it would otherwise look like.Otherwise, thanks for the link.Quote from: bktemp on July 22, 2014, 09:00:36 amThanks for the help.
Help, Anyone know what's this transformer?  - Page 1
Forum section: electronics / projects

author: Bartronics
author_rank: Newbie
timestamp: January 21, 2022, 11:34:55 pm
content: Sorry if this is a dumb question, but does anyone know precisely what kind of transformer this is... indicated on the schematic and BOM?I have a project I'm putting together and I've got most of the parts, but I'm not quite sure what this one transformer is?Is that 8 Ohms and 1 watt? Or is that 8 ohms and 1:1. I'm confused?Thanks in advance!

author: Bartronics
author_rank: Newbie
timestamp: January 21, 2022, 11:55:53 pm
content: I keep thinking its something like this? Maybe?https://www.amazon.com/10pcs-1300-Transformateur-Transformador-Amplification/dp/B0836MJP6J/ref=sr_1_1_sspa?crid=2IN8RRUZ01O2N&keywords=Audio+Transformer%2C+8+ohms&qid=1642809273&sprefix=audio+transformer%2C+8+ohms%2Caps%2C111&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzVExGWDJYQ0o3VlU4JmVuY3J5cHRlZElkPUEwODM1MDE3MlJJREZIRzVQNTZTViZlbmNyeXB0ZWRBZElkPUEwODI4Nzk1MldXVzREQkczUU44RyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

author: Bud
author_rank: Super Contributor
timestamp: January 22, 2022, 12:09:41 am
content: 8 Ohm to 1000 Ohm impedance transformer.

author: Bartronics
author_rank: Newbie
timestamp: January 22, 2022, 12:25:14 am
content: Ok thanks a lot, that makes sense actually... 8/1 K.The part about it being a matching transformer was throwing me off since there isn't two of them, wasn't sure if that meant matching windings like a 1:1?

author: Bud
author_rank: Super Contributor
timestamp: January 22, 2022, 02:02:01 am
content: Impedance ratio is proportional to turns ratio squared. 1000/8=125 impedance ratio. Square root of 125 is 11.18, we take 11 as integer turns ratio. So you will need 1:11 turn ratio transformer, the winding with less turns connected to 8 Ohm side.

author: TimFox
author_rank: Super Contributor
timestamp: January 22, 2022, 04:40:27 am
content: A "matching" transformer means that the transformer is designed to "match" impedances. In this case, the 8 ohm side is matched to a 1000 ohm side due to the turns ratio. The primary and secondary inductances are chosen to work efficiently at these impedances over the audio frequency range.

author: Bartronics
author_rank: Newbie
timestamp: January 22, 2022, 04:06:43 pm
content: Thanks for the tips and information! Yes I was reading up on matching transformers last night... I found these two links to be quite helpful as well. Matching impedance in audio transformers is an area I need to get a better handle on. Never ending supply of things to learn in electronics.https://www.electronics-tutorials.ws/transformer/audio-transformer.htmlandhttp://www.vias.org/crowhurstba/crowhurst_basic_audio_vol1_059.html

author: Zero999
author_rank: Super Contributor
timestamp: January 22, 2022, 05:15:38 pm
content: You could use a small mains transformer. 120V primary and 9V, or 12V secondary.
What is this type of wire-connector called? - Page 1
Forum section: electronics / projects

author: sherrellbc
author_rank: Newbie
timestamp: January 16, 2015, 04:33:27 pm
content: I am having the hardest time finding something like this on Mouser. I have find things similar, without the screw for example, but never exactly this. Is there a generic name for this type of connector?If you type something like PCB 2 Way Connector into Google then your search is through, but Mouser apparently has a different naming convention for these little connectors.Examples:http://www.amazon.com/2-way-Screw-Terminal-Block-Connector/dp/B00DSKC6TWhttps://www.robotics.org.za/index.php?route=product/product&product_id=508

author: aroby
author_rank: Regular Contributor
timestamp: January 16, 2015, 04:49:05 pm
content: Molex terminal blocks.

author: 8086
author_rank: Super Contributor
timestamp: January 16, 2015, 04:52:57 pm
content: Mouser calls them fixed terminal blockshttp://uk.mouser.com/Connectors/Terminal-Blocks/Fixed-Terminal-Blocks/_/N-7rqd7/

author: Richard Crowley
author_rank: Super Contributor
timestamp: January 16, 2015, 05:03:32 pm
content: http://www.mouser.com/ProductDetail/Phoenix-Contact/1984617/?qs=%2fha2pyFaduizT3RpwXOj1ZFdBq8gPerZPQJRHD310Ao%3d

author: LukeW
author_rank: Frequent Contributor
timestamp: January 17, 2015, 07:56:12 am
content: I would call it a PCB-mount screw terminal block, generally.They are commonly available in a range of different pitch, eg. 2.54mm, 3.5mm, 5.0mm, 5.08mm, 7.62mm etc.5mm and 5.08mm are both quite common, and looks like your example photo is one of those. You should be careful not to buy 5.0mm metric if your PCB layout uses 0.2" imperial or vice versa. If you've got 2 or 3 pins on the block they can be used interchangeably, but they will be incompatible if the block is larger.Digikey has a whole category of "Terminal Blocks - Wire to Board" - here's one typical example:http://www.digikey.com/product-detail/en/1935161/277-1667-ND/568614
What is this type of IDC connector? - Page 1
Forum section: electronics / projects

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 10, 2017, 07:28:25 pm
content: It crimps every other wire on ribbon. I was hoping to locate if still manufactured.Sent from my Nexus 9 using Tapatalk

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 10, 2017, 08:11:41 pm
content: Just use standard IDC connectors and block off one row of each.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 10, 2017, 08:58:46 pm
content: Quote from: mikeselectricstuff on April 10, 2017, 08:11:41 pmA. thanks but this is not question I asked.B. If you do what you suggest you end up with the unused row on the indide which impedes the clip opening.Does anyone know the manufacturer/part# of the pictured connector?Thanks

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 10, 2017, 09:33:34 pm
content: Quote from: dorkshoei on April 10, 2017, 08:58:46 pmOr, depending how you wire it, on the outside, which isn't a problem.I have seen single-row ones in the past, but not recently - I think you'll struggle to find them, especially in small qty.Google image search for "2.54mm idc connector single row" finds a few, but miost from obscure Chinese suppliersHere's one Chinese supplierhttp://don-connex.sell.everychina.com/p-97775982-2-54mm-idc-socket-single-row-connector-with-2-to-36-contacts.htmlYou may be able to use an HE14 type, though these are designed for 0.1" cable, so there may not be enough gap between the IDC bladeshttps://www.toby.co.uk/content/catalogue/products.aspx?series=A04a-xx-Bx1-G

author: Heartbreaker
author_rank: Unknown
timestamp: April 11, 2017, 03:53:18 am
content: The HCSS series from Samtec should do it. Farnell has some of them on stock./Sverre

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 11, 2017, 07:52:29 am
content: "Or, depending how you wire it, on the outside, which isn't a problem." Except I don't control pinout on other end, so always ends up on inside.Sent from my Nexus 9 using Tapatalk

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 11, 2017, 08:23:32 am
content: Thanks much for the hcss suggestion at first I thought they were only available preassembled with cable but checking with Samtec they are available as just connector as HCSS-xx-01-N. Only caveat is cable (1.27mm in my case) has to be 28AWG 7/36 but that is doable. $3 odd each from Avnet in USA, for 10 pin. Perfecto! Thanks. [Edit: Avnet not magnet]

author: tszaboo
author_rank: Super Contributor
timestamp: April 11, 2017, 08:42:24 am
content: This is hardly a standard application, so expect it to be expansive.Also, Samtec sells it directly, so just ask them for a qoute and samples.
What is this type of membrane keypad called - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 06, 2021, 05:53:15 am
content: My Commodore SX-64's keyboard became harder and harder to type on, so I opened it up to clean the contacts.I am not sure yet where the problem lies, usually it's the carbon "pill" contacts.But what exactly is this sheet? It's awfully thin yet seems to be a multi-layer sandwich. What is it called? Who makes this kind of stuff?I contacted Mitsumi and they just told me they have no info onold junkvintage stuff.

author: amyk
author_rank: Super Contributor
timestamp: March 06, 2021, 10:34:06 pm
content: Mylar or some other plastic sheet with silver deposition tracks. Membrane keyboard manufacturers will make it.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 07, 2021, 06:07:58 am
content: There's no silver here, and it's too rubbery to be Mylar.

author: SeanB
author_rank: Super Contributor
timestamp: March 07, 2021, 09:24:02 am
content: It is silicone rubber, and you do get repair kits for those keyboards which have that membrane in them as a new part, as the silicone wears out and the carbon printed tracks go high resistance. however try first cleaning with a lint free cloth and gentle rubbing of the gold PCB and the black printed side with isopropyl alcohol, nothing stronger than ethyl alcohol 90% or pure isopropyl alcohol, to remove any deposited film that prevents contact. Light rubbing, as that carbon ink will be very fragile now.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 08, 2021, 01:53:08 am
content: Yeah but I think the trouble is the set of contacts between the PCB and the membrane, it was under pressure with a metal stiffener held in place with two screws. Bad contacts there would impact all the keys, I couldn't really find a bad pill in the matrix, but this set of contacts looks bad.But I tore it off the PCB so now I'm in trouble.
What is VA rating Available at secondary side of the Transformer? - Page 1
Forum section: electronics / projects

author: Gurumurthy
author_rank: Regular Contributor
timestamp: June 13, 2017, 04:02:43 pm
content: Dear all,I bought a step down transformer, its rating at primary is 230V and secondary side 6V-0-6V @ 5 Ampere(centre tap transformer).What is VA rating Available at secondary side of the center tap Transformer before Rectification?what i Suspect is each Line of the secondary winding will give 6V*5A=30Watts. hence i could get totally 60 Watts from both lines with respect to center tapping. but if taken with respect to both lines of the secondary side it would give 12V*5A=60Watts. is This correct?

author: schmitt trigger
author_rank: Super Contributor
timestamp: June 13, 2017, 04:13:35 pm
content: Correct.But remember VA (volt-amps) only equals Watts at unity power factor.That includes both angle displacement and distortion factors.

author: Vtile
author_rank: Super Contributor
timestamp: June 13, 2017, 04:28:38 pm
content: Quote from: schmitt trigger on June 13, 2017, 04:13:35 pmThe DC have only one power that is the familiar Watt which is a resistive power, but the alternating current does have two more power types the VA (Volt-amperes) and var (Volt-Ampere reactive ). The VAr (or var) indicates the as said reactive power, which is formed from the relation of the capacitance and inductance (caps and coils) in the "network", the trap is that the coil and caps can cancel each others out (the VAr can be zero, while there is both caps and coils in the circuit/network). The Watts as W is "passive" power, also resistive power term is used, it is the pure resistor load in the circuit. The Volt-Amperes is the compination of these two Watts and VArs.This is simplified description as these are calculated in complex domain (but most of the time can calculated with simple sin, cos, tan and pythagoran theorem without knowledge of complex calculus).https://en.wikipedia.org/wiki/Volt-ampere_reactive
What kind of antenna is this. - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: September 26, 2017, 03:15:36 am
content: Can any one tell me what kind of antennas these are? They are for 900Mhz..

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 26, 2017, 03:39:55 am
content: Probablyhttps://en.wikipedia.org/wiki/Collinear_antenna_array

author: bjcuizon
author_rank: Frequent Contributor
timestamp: September 26, 2017, 04:45:04 am
content: Quote from: T3sl4co1l on September 26, 2017, 03:39:55 amYup, probably for gsm/mobile com antenna arrays.

author: hcglitte
author_rank: Regular Contributor
timestamp: September 26, 2017, 07:35:19 am
content: To me they look like end fed half wave dipole antennas.

author: LukeW
author_rank: Frequent Contributor
timestamp: September 26, 2017, 11:27:56 am
content: Are the wider cylindrical pieces 80mm long, or so?It just looks like a good old half-wave dipole.

author: cdev
author_rank: Super Contributor
timestamp: September 29, 2017, 05:56:24 pm
content: I think it may be a collinear but because the gaps between the wider sleeves, are not 100% consistent with what I would expect, its hard for me to say 100% unless you can give us images with more detail.The closer images look more like sleeve dipoles, the ones in the upper rear part of the picture are more likely collinear. Its probably collinear.

author: mrpackethead
author_rank: Super Contributor
timestamp: September 29, 2017, 06:07:23 pm
content: Im guessing i'm going to have to pull apart the antennas i have to find out for real! these pics are taken from a factory in china...

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 29, 2017, 06:29:30 pm
content: Looks like stacked dipoles, the bigger parts do seem to have a hole or even a circle around them in the middle.

author: cdev
author_rank: Super Contributor
timestamp: September 29, 2017, 06:40:53 pm
content: This is a coaxial collinear antenna, you can see the difference-http://www.nodomainname.co.uk/Omnicolinear/2-4collinear.htmIts likely possible to make one with sleeves, but its not so clear to me yet how they'd handle phasing...does anybody know?
What kind of board to board connector is this (Series, part #)? - Page 1
Forum section: electronics / projects

author: nexus
author_rank: Regular Contributor
timestamp: March 14, 2023, 04:54:31 pm
content: Hi all,Working on a project where I need to design an adapter/riser to bring a PCB out of the mainframe so I can probe it during operation. If anyone is curious, this is inside of an E8257 series signal generator.There are two main connectors that plug in to the motherboard - they are both Amphenol (AMP) branded parts. They appear to be from the same series; one has 130 positions, the other has 50. They are right angle, with 4 rows of half-pitch staggered pins soldering into the PCB. No keys or slots.I've tried searching all the usual websites (Digikey, Mouser) for this with no luck. The closest thing I found on the Amphenol website was their PHEN/PHEC series of connectors, but those are different as they have keying features and only go up to 120 positions. I've also see the term "Centronics" connector used to describe this style but no luck searching by that keyword yet.Thanks

author: TimFox
author_rank: Super Contributor
timestamp: March 14, 2023, 05:09:36 pm
content: To add to the confusion, "AMP" and "Amphenol" are different companies, although Amphenol has bought some lines from AMP.

author: nexus
author_rank: Regular Contributor
timestamp: March 14, 2023, 05:16:24 pm
content: Quote from: TimFox on March 14, 2023, 05:09:36 pmThat was helpful, I forgot that TE makes an "AMP" line of connectors which has nothing to do with Amphenol.I looked around on TE and found this part #:https://www.te.com/usa-en/product-4-5175474-2.htmlThat might be it..edit: which means I'm screwed because it is not in stock anywhere, even the scalper websites!

author: reboots
author_rank: Regular Contributor
timestamp: March 14, 2023, 06:46:09 pm
content: AMP Champ .050 is likely correct. The larger .085 variant is often called a "Centronics" connector. "Micro ribbon connector" is another term for the family."Mini D Ribbon" (MDR) appears to be a compatible .050 pitch series. Here is a 3M 50-pin MDR to try:https://www.digikey.com/en/products/detail/3m/10150-3000PE/773867If you can locate 68-pin versions, and you're feeling really desperate, you could carefully cut up two of those to frankenstein together a 130-pin connector. I mean, really desperate.

author: nexus
author_rank: Regular Contributor
timestamp: March 14, 2023, 09:20:07 pm
content: Quote from: reboots on March 14, 2023, 06:46:09 pmThanks, I'll add that 3M MDR to my next order. The 50 pos Champ .050 seems to be available, the 130 pos is of course super obscure. I'll email TE and see if they have any samples. I only need one of each (plug and receptacle).Can't think of another product where this connector is used besides PSG signal generators. Maybe ESGs? If I can find scrap boards that would be the other route.
What kind of coax connector is this? - Page 1
Forum section: electronics / projects

author: nexus
author_rank: Regular Contributor
timestamp: September 06, 2021, 04:37:40 am
content: Hi all,Working on an instrument; I want to buy some leads so I can power a board outside the unit for troubleshooting.Only problem is I have no idea what type of coax connector this is. I've tried searching for threadless and board-to-board coax types, but nothing points me in the right direction.Barrel diameter is 0.160 inches (4.06mm), barrel length is roughly ~0.270 inches (6.85mm).

author: nexus
author_rank: Regular Contributor
timestamp: September 06, 2021, 04:38:57 am
content: No idea why pic #3 is upside down. Apologies

author: bob91343
author_rank: Super Contributor
timestamp: September 06, 2021, 05:53:27 am
content: Maybe SMB.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 06, 2021, 01:38:58 pm
content: They kinda look like DIN 1.0/2.3 connectors which I've seen used for SDI (the video thing, not space-based defense).But it's missing a ridge and that looks like a RF board. Dimensions match, at a glance.https://www.amphenolrf.com/connectors/1-0-2-3-connectors.html

author: nexus
author_rank: Regular Contributor
timestamp: September 06, 2021, 05:48:37 pm
content: I thought it might be SMB initially, but besides the lack of a snap-ring it also does not match dimensionally. Looks like the OD on the SMB male plug is about 0.143".The DIN 1.0-2.3 appears to be closer; the OD is drawn as being 0.163. The mystery connector however is still a "snapless" design unlike the DIN.

author: nali
author_rank: Frequent Contributor
timestamp: September 06, 2021, 06:51:57 pm
content: MCX might be a possibilityhttps://en.wikipedia.org/wiki/MCX_connector

author: Cerebus
author_rank: Super Contributor
timestamp: September 06, 2021, 08:28:17 pm
content: From the ever useful "Pasternack Connector Identifier":

author: nexus
author_rank: Regular Contributor
timestamp: September 06, 2021, 08:54:11 pm
content: That's got to be it! Time to order some cables.Should be fun to poke around the board with some near field probes when its on.

author: Cerebus
author_rank: Super Contributor
timestamp: September 06, 2021, 09:34:33 pm
content: Be aware there are a number of types of 1.0/2.3 connectors. That appears to be the slide on type. If you google for it, you ought to be able to find a copy of the Pasternack document for yourself and double check for yourself - it's worth having a copy filed away anyway for these sort of questions.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 07, 2021, 12:54:04 am
content: I guess the slide-on types are the ones I see in video stuff. Well that's solved.
What kind of connector does Lego WeDo 2.0 use? - Page 1
Forum section: electronics / projects

author: Phoxtane
author_rank: Regular Contributor
timestamp: February 12, 2018, 05:28:30 am
content: There's a lot of discussion happening over on the relevant Lego forums, as the new Trains sets coming out this year are being moved to Lego's Power Functions 2.0 system. In doing so we're losing the old four-wire PF connector (seen below):As far as I know this is a custom connector that Lego developed themselves. However, the PF2.0 system uses the same connectors as the Lego WeDo 2.0 educational stuff and the new Lego Boost range. It's got six wires, and has a 'pluggable' connector, as seen below:The hub has corresponding connection points:Now, I've got the suspicion that the new connectors are not something that Lego developed, but has adapted for their own use, similar to how the Mindstorms sets use RJ12 connectors on their cables. Can somebody help me identify what connectors Lego is using, or even they're something commercially available? As you can see in the last picture of the hub, the connector itself is a different color plastic than the surrounding material - which makes me think that it's attached, unlike the current PF connectors that are typically molded into the device (see the IR receivers as an example of this).

author: spostma
author_rank: Regular Contributor
timestamp: December 09, 2022, 09:27:41 pm
content: a late reply, but just in case, see LEGO info:https://www.philohome.com/wedo2reverse/connect.htm
What kind of epoxy is this? - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: January 23, 2019, 10:15:17 pm
content: I would like to seal some electronic boards to make them waterproof with the same stuff that's used at the bottom of full bridge rectifiers. You know that glass hard transparent kind of surface that seals really well?What is it called and can I find it on Aliexpress?

author: Benta
author_rank: Super Contributor
timestamp: January 23, 2019, 10:31:15 pm
content: It's plain epoxy with added black colouring. Nothing magic.But lots of epoxies have additives in them, not due to the final result, but to ease working with them.The rectifier in your picture is super simple to seal, because you can just pour in the epoxy, and that's it.Coating a PCB is a different story, it's not like pouring epoxy into a bowl.Do a search for "conformal coating", that will bring you further.

author: Electro Detective
author_rank: Super Contributor
timestamp: January 23, 2019, 10:48:24 pm
content: Watch out for bubbles when applying epoxy,and or look into how to avoid or pop them

author: Tomorokoshi
author_rank: Super Contributor
timestamp: January 23, 2019, 10:54:28 pm
content: It's more specifically known as "potting compound". There are various types with different mechanical properties.https://en.wikipedia.org/wiki/Potting_(electronics)

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 23, 2019, 11:03:51 pm
content: A famous manufacturer of those:https://www.electrolube.com/products/epoxy-potting-compound.html
What kind of gloves are used on a finally assembly line/QA? - Page 1
Forum section: electronics / projects

author: george graves
author_rank: Super Contributor
timestamp: June 16, 2015, 10:56:42 am
content: I'm doing a small batch(150 or so) of products that part of the enclosure(display) is a super glossy, shinny plastic that takes fingerprints like mad. I've work in manufacturing where the parts were CNC'ed stainless steal, and much larger - so thick cotton gloves were used.But these units are about the size of a pack of cigarettes(for lack of a better comparison) and need about 5 mins to assemble and screw together - lots of time to leave finger prints. I was thinking nitrol/latex gloves, but the second you touch anything with oil on it, the glove will pick it up. I think what I'm looking for is a super thin cotten glove. But I have no clue. (and no, cleaning afterwards is not an option)What does china use to keep finger prints off products?

author: SeanB
author_rank: Super Contributor
timestamp: June 16, 2015, 11:10:08 am
content: China uses a solvent wash and regular change of workers as they are killed by the toxic solvents.You probably will be using unpowdered surgical gloves, which do not leave powder residue, and which are a snug fit. Regular glove changes, or simply an overglove with 2 pairs and pull the outer off on working with oil will be the best alternative, otherwise you will need to find some tight fitting cotton gloves.

author: Unknown
author_rank: Unknown
timestamp: June 16, 2015, 12:22:01 pm
content: Something likethese puppys? Available in cotton, poly/cotton, bamboo fibre, lint-free (usually nylon), with or without carbon antistat fibre. Check ebay or your local safety gear supplier.

author: Ton
author_rank: Regular Contributor
timestamp: June 16, 2015, 09:05:40 pm
content: +1Used to use something very similar working with mobile phone PCB and mechanical assemblynever left a fingerprint even on the most shiny surfaces, and you still have a reasonable good feel for what you are doingtypical a antistatic elastic thin knit glove with PU covering the palm.Ton

author: calexanian
author_rank: Super Contributor
timestamp: June 16, 2015, 09:50:10 pm
content: You want what are called Coin Inspection Gloves. Also used for silver. They are thin enough that you can handle screws and such, yet thick enough that oil does not soak through from your fingers. Also they are not fuzzy so your product will not have fuzzies on it.

author: Deathwish
author_rank: Unknown
timestamp: June 16, 2015, 10:45:42 pm
content: Quote from: calexanian on June 16, 2015, 09:50:10 pmagreed, i used to collect coins, mainly victorian shillings, and they were a must have item
What kind of insulation for winding your own transformers/coupled inductors - Page 1
Forum section: electronics / projects

author: lordvader88
author_rank: Frequent Contributor
timestamp: April 27, 2018, 05:55:35 am
content: I have to rewind a transformer, for a vacuum tube oscilloscope. From 120V upto about 550Vrms. Whats some recommended tape or plastic/etc that will last and not melt in a big old hot transformer. They used paper or a cloth type thing, glued up. I can still remember the burnt smell taking it apart, yuk.I'll have to get all the proper rated magnet wire too, another day tho.Also for fun I want to try making some small HV SMPS trans/CI. Just power off 12Vdc 1A. How safe is standard PVC tape and ordinary office paper for little low energy flybacks like for a Jaccob's Ladder you see on ebay

author: Rerouter
author_rank: Super Contributor
timestamp: April 27, 2018, 08:44:33 am
content: I would say something like kapton tape.

author: CJay
author_rank: Super Contributor
timestamp: April 27, 2018, 09:24:43 am
content: I wouldn';t use PVC tape, it'll 'probably' be ok for a while but it's not good with heat.I'd use a high temperature tape, Kapton or similar as Rerouter says, there are also 'proper' transformer tapes as well as fibreglass tapes.I wouldn't want anything that could absorb moisture in a high voltage transformer but office paper might be fine if soaked in 'dope' or lacquer to seal it

author: Neilm
author_rank: Super Contributor
timestamp: April 27, 2018, 09:43:12 am
content: Quote from: CJay on April 27, 2018, 09:24:43 amOld transformer with paper in would have the paper soaked, then when wound would be placed into a vacuum chamber and impregnated under vacuum. I wouldn't try to replicate that for fun. Stick with the kapton tape

author: lordvader88
author_rank: Frequent Contributor
timestamp: April 27, 2018, 01:18:15 pm
content: Ok thanks, kapton tape, they use around heater elements too right ?
What kind of solar cells/panel is this? - Page 1
Forum section: electronics / projects

author: timb
author_rank: Super Contributor
timestamp: January 01, 2015, 09:53:35 am
content: Last year, a guy on another forum sent me a few solar panels to experiment with for a project I was working on at the time. He claimed they were good panels with high efficiency, blah blah blah, long story short, that project didn't end up going anywhere, but I've got some ideas kicking around that would use PV.I have no idea how good these panels are, but they almost look like they're made out of FR4 (which is what he claimed, I.e. they were PCB material and the manufacturer could produce a full board layout on the bottom with the cells on the top).I can't get in touch with the guy anymore, so I'm wondering if anyone can tell me what type of panel this is. Thanks!Sent from my Tablet
What kind of thermal kompound is this (filling large gaps)? - Page 1
Forum section: electronics / projects

author: ivaylo
author_rank: Frequent Contributor
timestamp: June 18, 2019, 06:17:22 pm
content: I am familiar with the thermal compounds which fill tiny gaps between a chip and a radiator where the distance between the two is like 0.2mm. I've been messing with this security camera where two of the chips have a blob of gray stuff between them and the aluminum chassis filling a gap of at least 3-4mm. First, I haven't seen this big of a distance gapped with thermal compound. And second, it must be a special type so they are sure it doesn't soften/melt/contract so the gap is no longer filled (it is still pretty soft and pliable after years in there). They also must be dissipating not that much heat with this. Does anyone know what type/brand this type of compound might be?

author: andy1
author_rank: Contributor
timestamp: June 18, 2019, 06:27:41 pm
content: Can't say about the spesific compound used but many gap fillers are exactly like that and can fill even quite large gaps while still keeping quite good thermal conductivity (not perfect by any means).If you need to replace that I would just buy some thick adhesive lined silpad or similar thermal pad as the mixed ones are usually annoying or expensive for non-production use (cannot be stored indefinately, needs mixing etc).

author: ivaylo
author_rank: Frequent Contributor
timestamp: June 18, 2019, 08:55:37 pm
content: Thank you.

author: OM222O
author_rank: Frequent Contributor
timestamp: June 18, 2019, 09:47:38 pm
content: For large gaps usually thermal pads are preffered
What kind of tube base/socket is this? - Page 1
Forum section: electronics / projects

author: TMM
author_rank: Frequent Contributor
timestamp: January 31, 2022, 04:32:33 am
content: Any tube nerds know what kind of base/socket this is? Tube is a russian TG1-1/0,8 thyratron.It's 10-pin, looks like a larger version of octal. Pins are on a 25mm diameter circle and the key is about 16mm diameter. Perhaps some kind of socket used by CRTs?Pictured next to an octal tube for comparison

author: bob91343
author_rank: Super Contributor
timestamp: January 31, 2022, 05:53:46 am
content: On a CRT most likely.

author: CaptDon
author_rank: Super Contributor
timestamp: January 31, 2022, 06:32:26 pm
content: It looks kind of like the 12 and 14 pin C.R.T. bases, however I am unaware of any 10 pin C.R.T. application. Trying to find a mate will be challenging.

author: TMM
author_rank: Frequent Contributor
timestamp: February 01, 2022, 12:32:38 am
content: Taken a gamble buying some of these:https://www.ebay.com.au/itm/162854522467ratio of key diameter to pin diameter looks wrong, but hopefully the pin diameter is correct and I can just make the key hole larger.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: February 02, 2022, 12:46:35 am
content: If (especially) it is a Thyratron, it is possible that it is listed somewhere as a relay socket.

author: rsjsouza
author_rank: Super Contributor
timestamp: February 03, 2022, 01:50:51 am
content: Perhaps ask this guy for the dimensions?https://www.ebay.com/itm/154474451284?hash=item23f7651154:g:rcEAAOSw8VtcRq-3

author: TMM
author_rank: Frequent Contributor
timestamp: March 23, 2022, 05:14:56 am
content: something something, chicken dinnerRandom 10pin ebay socket is perfect if not very very close to having the correct pin spacing. Key hole just needed to be enlarged
What kind of varistor is this? - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: April 27, 2019, 10:02:36 am
content: Can anyone identify this component, possibly a varistor?

author: Andy Watson
author_rank: Super Contributor
timestamp: April 27, 2019, 11:02:20 am
content: I would say it is a capacitor 1n5 F. The 400 V AC and peak 4kV rating, along with all the other certification logos suggest that it is rated for safe use on mains.

author: Benta
author_rank: Super Contributor
timestamp: April 27, 2019, 11:24:38 am
content: It's a 1.5 nF Mica cap for mains use.

author: Gyro
author_rank: Super Contributor
timestamp: April 27, 2019, 11:35:36 am
content: This is funIt's a 1.5nF 400V AC, 4kV AC test, Ceramic. Note that while it's certified for flamability, it's not suitable for use (unprotected by a fuse) across the mains as it doesn't have an X or Y marking.Edit: Y2 would require 5kV test and Y1, 8kV.

author: AndersJ
author_rank: Frequent Contributor
timestamp: April 27, 2019, 12:23:18 pm
content: Thanks everyone.I saw the 1n5 marking,but it never occured to me that it could be anything but a varistor.

author: Benta
author_rank: Super Contributor
timestamp: April 27, 2019, 02:34:57 pm
content: Quote from: Gyro on April 27, 2019, 11:35:36 amThe markings say it has mains use approval for Switzerland, Sweden, Germany, US, GB, which then automatically leads to approvals for other countries, generally all of the EU. It's approved for Y and X1 use.It's ceramic and older than 1994, where the approval markings changed (X or Y specifically marked on the part).

author: 3roomlab
author_rank: Frequent Contributor
timestamp: April 27, 2019, 02:51:34 pm
content: Quote from: Benta on April 27, 2019, 02:34:57 pmwhat gave that away?the VDE triangle?

author: Benta
author_rank: Super Contributor
timestamp: April 27, 2019, 03:11:33 pm
content: Quote from: 3roomlab on April 27, 2019, 02:51:34 pmNo, it's just a question of when the standards changed due to EU harmonization rules and the shift to using the ENxxxxx norms.Here's an example:pdf.datasheet.live/datasheets-1/vishay_presicion_group/7/WKP102MCPTD0K.pdf

author: floobydust
author_rank: Super Contributor
timestamp: April 27, 2019, 04:34:45 pm
content: BS 415 "Specification for safety requirements for mains-operated electronic and related apparatus for household and similar general use " withdrawn Nov. 1995

author: Gyro
author_rank: Super Contributor
timestamp: April 27, 2019, 05:41:20 pm
content: Good find on the datasheet. I must admit to being a bit puzzled to see a BS415 marking on what looked to be a relatively modern (well at least, clean) looking part.Sadly topical.

author: Zero999
author_rank: Super Contributor
timestamp: April 27, 2019, 06:58:02 pm
content: Yes, I found this, which says BS415 = Y2.https://datasheet.octopart.com/CS13-E2GA332MYNS-TDK-datasheet-12535414.pdf
What kind of wires are used for high pressure underwater environments? - Page 1
Forum section: electronics / projects

author: Dhanushka
author_rank: Regular Contributor
timestamp: January 27, 2022, 11:00:56 am
content: Hi!I am recently in a project based on designing a wiring (both power and communication) for a deep high pressure underwater environment. In researching the IEC standards, I found that IP ratings (IP68) is suitable to decide select a suitable wire. I do not have previous experience for this. Also, So I am happy if someone can give me a comment about any of following things.1. What are the other standards for section of wires for this application.2. Available wires for this application if you know.3. Available enclosures for this application if you know.4. Design aspects of this application.Thanks

author: voltsandjolts
author_rank: Unknown
timestamp: January 27, 2022, 12:05:32 pm
content: There are folks who do this for a living:https://www.te.com/usa-en/products/brands/seacon.html?tab=pgp-storyhttps://www.eaton.com/us/en-us/catalog/industrial-connectors-assemblies/wet-mate-connectors.htmlhttps://www.macartney.com/what-we-offer/systems-and-products/connectors/https://www.hydrogroup-uk.com/cables/http://cre-marine.com/...etc, etc..
What kinda waveform is this? - Page 1
Forum section: electronics / projects

author: Merlysys
author_rank: Regular Contributor
timestamp: January 10, 2014, 01:38:29 am
content: I am trying to decode the data sent to the LCD of a kitchen scale, goal is to decode how much weight the LCD is showing.LCD has 16 inputs, 4 of them always show a waveform like in first pic. Why are all 4 identical and what info is being sent to the LCD? (Maybe I have to look deeper to notice the difference)The other pins show a waveform I am not familiar with, as shown in the next 2 pics. The style varies depending on the weight placed on the scale. Is there a name for this waveform? a way to decode it?These scales are auto-off, is there a way to prevent them shutting off? No menu to select that.Scalehttp://i.walmartimages.com/i/p/00/07/77/84/00/0007778400510_500X500.jpg

author: Matt_Heilman
author_rank: Newbie
timestamp: January 10, 2014, 01:54:19 am
content: The last two images remind my of the type of signal I saw on the composite video from my Atari on monochrome mode.http://m.eet.com/media/1050359/C0195-Figure1.gifAs for keeping the scale on, perhaps you could periodical pulse the ON signal.

author: Rory
author_rank: Frequent Contributor
timestamp: January 10, 2014, 02:01:57 am
content: Here's a starting point.http://www.pacificdisplay.com/lcd_multiplex_drive.htm

author: jerry507
author_rank: Regular Contributor
timestamp: January 10, 2014, 02:10:18 am
content: That's how you directly drive a segment LCD. Those 4 pins with the funky waveforms are the common pins. Look at the following document. You have a 1/2 bias/2 mux waveform. These various bias patterns let you drive with fewer pins. You can have a single pin driving multiple segments and by carefully combining them, you can have a situation where many segments have half the bias voltage applied (which isn't enough to light them) but two segment pins will present 1/2 the bias voltage and one segment will see enough voltage from both pins and will light.http://www.ti.com/sc/docs/products/micro/msp430/userguid/ag_14.pdf

author: amyk
author_rank: Super Contributor
timestamp: January 10, 2014, 10:48:55 am
content: The waveform is AC, it is to prevent DC bias from forming on the electrodes which causes electrolysis and degradation.

author: jaxbird
author_rank: Frequent Contributor
timestamp: January 10, 2014, 07:05:48 pm
content: I did something similar and documented the process, have a look at this thread:https://www.eevblog.com/forum/projects/hooking-into-segmented-lcd-display-to-read-displayed-values/Might be helpful and save you some time.