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Topic: BOM ist jetzt in unserem WIKI (Read 5730 times)
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yo2ldk
Neuling
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Posts: 22
I love SDR & OVI40 !
 
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Re:BOM ist jetzt in unserem WIKI
« Reply #1 on: 28. September 2017, 04:53:11 »
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Thank you for this BOM list Andreas.
a quick question, just to be sure I not order the wrong parts:
at Farnell is noted like this:
Resistor Case Style 0603 [1608 Metric] or
Resistor Case Style 0201 [0603 Metric]
I presume first is the correct size for 0603 from BOM ?
73 de yo2ldk - alex
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Vy 73,
de yo2ldk - Alex
kn05WH
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yo2ldk
Neuling
Offline
Posts: 22
I love SDR & OVI40 !
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Re:BOM ist jetzt in unserem WIKI
« Reply #2 on: 28. September 2017, 06:55:32 »
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Viele Danke Thomas, for confirmation !
73 de yo2ldk - alex
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Vy 73,
de yo2ldk - Alex
kn05WH
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KevinA
Neuling
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Posts: 16
It's English
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Re:BOM ist jetzt in unserem WIKI
« Reply #3 on: 05. October 2017, 02:24:51 »
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Visited the BOM in the Wiki:
1. No export CSV, PDF can't be sucked into a spreadsheet to get quotes with. Well it can but it is a pain; Word 2016 open PDF then save as word XML, Open XML with Excel, in the case of your BOM after clearing the top of the BOM so only the spreadsheet header was left it worked. But the current BOM does not have the information needed to get quotes, you need manufactures part number and to get those you need:
Package Type, Voltage, Material, Tolerance, Freq., Temperature range, Current, Wattage
Not all that is needed for passives but once you have the engineering information, looking up parts that can be used instead of trying to re-engineer a design is a lot less painful.
2. 'Part' in your BOM is the Reference Designator, RefDes, in an American BOM. For your project you need an unique Part number for that board-part that can be matched to the RefDes. When you export to get a quote form Mouser and DigiKey you can import that unique part number so that after you get the CSV from the distributors you can match it back to your master part list.
3. Distributor part numbers suck, look at the manufacture part numbers since ALL distributors can pull up the manufactures part number for doing quotes, once you have a quote it is good for xx hours/days. Don't bother with pricing in that list since it becomes dated overnight. With the manufactures part numbers it really is simple to get a quote and check stock.
4. If you have only ONE manufacture for a part like that SD socket, don't use it. On items like the Codec, it's a toss, seems everyone is into making Codecs but no two are the same other than package. The mcHF stereo jacks is a good (or very bad example), the one jack that was used is a unique part, almost all other jacks that company makes can be crossed to other manufactures parts but NOT the one that was used in the mcHF.
Once you have manufactures part numbers getting the distributor part numbers should only take a few minutes and always have more than on manufactures part number as in Europe / US / Asia all have manufactures that only sell in those markets.
You'll have to rename the attached file to BOM.XLSX to read it 'Allowed file types: txt, jpg, jpeg, gif, pdf, png, doc, odt, ods, fpl '
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Kevin K2AAE
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KevinA
Neuling
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Posts: 16
It's English
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Re:BOM ist jetzt in unserem WIKI
« Reply #4 on: 05. October 2017, 04:43:25 »
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I've been using DM3BT-DSF-PEJS for SD cards, I like the push-push and everyone carries them. They have both top and bottom mount.
Update: DM3AT-SF-PEJM5 top mount
I checked Eagle but they are not in my version 7.x
I can export mine if you need them, have the STEP for them!
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| « Last Edit: 05. October 2017, 05:35:31 by KevinA » |
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Kevin K2AAE
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KevinA
Neuling
Offline
Posts: 16
It's English
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Re:BOM ist jetzt in unserem WIKI
« Reply #6 on: 05. October 2017, 18:55:02 »
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I checked out the editable table, Ctrl+a, paste into a text file and open with Excel as '|' delimited text file.
Somewhere, somehow I got the impression you were using Eagle, didn't mean to offend you.
The mcHF BOM is an unmitigated disaster that just keeps moving forward since no one can fix the problem except the person that created the schematics. In every PCB program I've worked with (and that been a few over 40 years) you can specify what each part is 'suppose to be' and flag any part that has multiple values. In the case of simple capacitors like mcHF C18 & 19 we ended up with Tantalum instead of Electrolytic. So far the best mcHF BOM I have found was done by KE7OEI but he made the same mistake as everyone else: Distributor part numbers instead of manufacture part numbers but he did an outrageously great job with defining refdes to board location and alternatives along with changes.
That's what that odt is! see attached from your BOM.
I take it 'that (t h a t)' becomes 'did' through the translator ...
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 spread.ods
« Last Edit: 05. October 2017, 18:57:27 by KevinA » |
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Kevin K2AAE
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KevinA
Neuling
Offline
Posts: 16
It's English
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Re:BOM ist jetzt in unserem WIKI
« Reply #7 on: 06. October 2017, 02:36:01 »
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I was looking at the PCB and noticed J1, J2, J4 footprint does not match the 121-7016 jack at Farnell. J3 does match the footprint.
J1, J2, J4 appear to be MX-387GL or like https://goo.gl/RpLVNX which appears to be millions of..
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Kevin K2AAE
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KevinA
Neuling
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Posts: 16
It's English
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Re:BOM ist jetzt in unserem WIKI
« Reply #9 on: 06. October 2017, 05:09:09 »
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'My "dream" is did some day I have written a server side script did Provides BOM for the main distributors'
I signed up for DigiKey and Mousers API keys then found out they have limited to a number of searches a month. They may change but as long as there are groups willing to pay I doubt they will. Farnell has ePass, I don't know what limit they have. I did something like this for collecting food menus from all the food chains: PHP and curl: grab the menu, extract menu items with health information and stick it into a database and move on to the next food provider. Our wellness customers could select what they had for lunch and we could tell them what they ate, salt, fat, etc.
I'll have to revisit that concept with the part distributors since it could be done once a week to keep current on the availability and price then stick the results in web page..
But first get my shield built right after I finish a mcHF, yes, they (Rf and UI built) arrived today but I didn't realize I'd needed to purchase so many parts on boards that were all ready 'finished'.
73 Kevin K2AAE
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Kevin K2AAE
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peter_77
Urgestein
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Posts: 735
THE mcHF and UHSDR forum !
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Re:BOM ist jetzt in unserem WIKI
« Reply #11 on: 07. October 2017, 13:59:33 »
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Is it possible to replace the 6 Alu Elko 220µF with tantalum ones ?
During version 1.6 pcb assembly of the I40 UI it turns out that a possible alu separation plate between UI and RF board (here mcHF RF) needs a lot of cutouts around these Alu Elkos.
This can be fully avoided when using tantalum versions instead of the Alu Elkos. The tantalums have less height and need no cutouts.
Or may this have any negative effects on functionality ?
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| « Last Edit: 07. October 2017, 14:01:10 by peter_77 » |
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DF5LI
alter Hase
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Posts: 371
Ich liebe meinen SParrow !
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Re:BOM ist jetzt in unserem WIKI
« Reply #13 on: 07. October 2017, 18:56:06 »
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The distance between the rf- and ui-board ist determined to 11 mm, because this distance is given from headers P1 on both boards. This is **not** depending on the chinese or any other cases. If you will use a shielding plate without cutouts for the Cs and other parts, you have to use much longer headers. 
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| « Last Edit: 07. October 2017, 19:41:50 by DF5LI » |
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73, Harri
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Pages: [1] 2 
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In the meantime contributions to make the BOM better are highly appreciated.
