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Bourns Filters for SE/30 - where to buy?


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#1 JDW

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Posted 19 March 2012 - 03:30 AM

I know Digi-Key "lists" the Bourns filters used by the SE/30 logic board, but they don't stock them:
http://parts.digikey... ... 0-201.html

Therefore, does anyone one a seller who does have stock of them? Or is there someone among us who has a few spares (known-good chips, ready to be soldered into a board)?

Thanks.

#2 techknight

techknight
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Posted 19 March 2012 - 03:50 AM

Newark/Farnell has them:

http://www.newark.co... ... CMP=AFC-OP

I used to order from these guys before, but most of their stuff has to come from UK which takes awhile, and they charge exportation fees.\

might be cheaper to order direct from farnell export site.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#3 JDW

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Posted 19 March 2012 - 04:14 AM

Farnell UK has them:
http://uk.farnell.co... ... dp/9356010

But RS Components UK is a tad cheaper on quantities of 5, although not by much:
http://uk.farnell.co... ... dp/9356010

These chips are freaking expensive! I didn't find anything on EBAY either.

#4 JDW

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Posted 19 March 2012 - 04:41 AM

TTI seems to have them in-stock (minimum order of 20 though). The part number is right, but the data sheet and technical specs are wrong:
http://www.ttiinc.co... ... 5995648_9#

I also found these guys, whose website looks like it was created 10 years ago or so:
http://www.dfsales.c... ... 01-250/201


Thoughts?

#5 JDW

JDW
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Posted 19 March 2012 - 09:24 AM

Sorry, I did a bad copy/paste on the RS UK link above. Here's the correct link (which shows a discount for 5 pcs):
http://uk.rs-online....etwork/6909903/

All are searches for part number: 4120R-601-250/201L

Problem is that both Farnell UK and RS Components UK require you to register with a UK address. And the US branch of RS doesn't list the Bourns filter:
http://www.alliedelec.com/

Ack!

Here's a zoomable hi-rez photo of on of my recapped logic boards:
https://picasaweb.go... ... 4101043730

The 3 Bourns filters are shown at right in that photo (RP2, RP3 and RP10).

#6 Bunsen

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Posted 20 March 2012 - 10:32 AM

For future reference, octopart.com is a great search engine for finding who has what in stock and at what price.

have you searched? Seeks: Nubus PDS DSP PB170 Newton; TRS-80 III/4; CBM BBC SX-64 CX5M Likes: 8bit luggable palmtop terminal NC tablet audio MIDI analog FM drum synth steam&dieselpunk; 1930-1980 lab/comm/mil Score! NC100 PB190 Q950 IIe-PDS


#7 JDW

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Posted 20 March 2012 - 11:17 AM

Thanks, Bunsen. Here's the quicklink search for the Bourns network filter on that site:
http://octopart.com/.../r ... 250/201L

But alas, it only lists what I already listed earlier in this thread.

It seems the only place to buy outside the UK is from Newark. But dad burn it, that $20 handling fee is simple outrageous if you're only wanted to order $25 worth of chips! Not to mention shipping fees are on top of that. Ack!

#8 techknight

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Posted 21 March 2012 - 01:30 AM

maybe a group buy? then again, need demand for a group buy to be worthwhile.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#9 JDW

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Posted 21 March 2012 - 04:11 AM

Since there are so few "knights" of tech out there, I was just thinking of buying 6pcs or so and sending them all to you. Who else among us would put them to such good use as you? If there is anyone, of course, please speak up now.

I don't mind paying $4-$5 per chip plus a reasonable amount in shipping. But a $20 "handling fee" for no good reason (Newark) is a rip-off!

#10 techknight

techknight
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Posted 22 March 2012 - 12:48 AM

Well thats if you order from newark, that $20 fee is for them to order from farnell and have them shipped to their warehouse. Then from there, shipped to the destination.

i wonder if you can order from farnell directly? to avoid that fee? I doubt it but its worth a shot.

Oh when it comes to those filters, you can test if they are bad by doing this one SIMPLE step:

if there is any continuity between the ground point which would be 10,11 and 1,20 of the filter, to any other pin, its bad. Especially if its low ohms from pin to pin.

Speaking of knight of tech, I gotta finish up rebuilding a plasma TV Y-sustain module. I really hate those TVs. with a passion, especially when they decide to blow out. When they blow, they blow... take out nearly every power transistor in the ER and Y-SUS output stages. yuck.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#11 JDW

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Posted 22 March 2012 - 01:07 AM

Sadly no. As I mentioned in a previous post in this thread, ordering direct from Farnell requires one to ship to a UK address. I do have a friend in the UK, but once you pay the friend to take a trek to the post office and pay the international shipping fee, you're out the same as that outlandish $20 Newark fee.

Too bad they don't carry them at Radio Shack! :-)

#12 techknight

techknight
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Posted 22 March 2012 - 03:19 AM

yea i know. Only thing they carry at radioshack anymore is phones. phoneshack it is.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#13 trag

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Posted 23 March 2012 - 10:40 PM

I think I bought some of those from DFSales a year or two ago. I don't remember what I paid though. I thought their price was reasonable, but that's all the memory I have. Sigh. Leaky brain. I know I didn't pay more than $2 each at the time, as more than that would be notable even for my terrible memory.

#14 JDW

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Posted 24 March 2012 - 12:56 AM

Trag, goes that mean you still have a stash of Bourns filters that you would be willing to sell at a reasonable price?

#15 JDW

JDW
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Posted 27 March 2012 - 01:20 AM

Trag...?
(Ditto my previous question.)

#16 trag

trag
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Posted 27 March 2012 - 04:17 PM

I think I do, but I can't seem to find them. I thought they were still in my room, in my box of active (most used) parts, but I couldn't find them in there. I checked my attic inventory listing, but they're definitely not in there. I remember getting them, but I can't remember what I did with the tube after I took it out of the box. It may be hiding on my work bench. That's harder to explore.

I also went through my mound of old receipts and didn't see one, but that doesn't mean anything as that gets sorted every year. I can't access my older emails (on-line invoice) because my primary machine died a while back. I have backups and such, but haven't had time to fix the machine and bring it back up. The laptop and web based email has been keeping me going the last six months.

#17 SEthirty

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Posted 27 March 2012 - 07:57 PM

You can try ordering one via the Bourns sample service.
I know this isn't really a "fair" way to obtain parts, but at least you can get the part this way.

#18 JDW

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Posted 28 March 2012 - 12:30 AM

SEthirty, bless you, friend!

And although it would be wrong to use "samples" on a continual basis, fact is that none of us have tried that specific part number first-hand (not to my knowledge), and so we would need a few samples to test. Why pay $20 to Newark for something that may or may not work perfectly? Then once you have tested the samples and verified they work, then of course ethics would compel one to make a purchase for additional parts.

#19 techknight

techknight
  • 68LC040

Posted 28 March 2012 - 02:02 AM

I think with samples though, there is a limit. you can only sample so many of one part. like 2 or 3. I could be wrong with bourns, but its like that with maxim.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#20 SEthirty

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Posted 28 March 2012 - 05:14 PM

Yeah, it would be kinda logical to have a limit.
I order quite regularly op-amps from National, for my high-quality CD-player (yeah, I'm kinda audiophile :) )
They ship up to 5 types of things per week, at a maximum quantity of 5 per type.
That is really nice of them, because now I can try lots of different op-amps, so I can determine which one sounds the best in my design :beige:
For the ones who are interested : it currently is the LM6172, originally a video-op-amp.
It really would cost me a lot of money to buy them all, and maybe use them once or twice, if them don't sound nice.

But, please, don't over-use this !




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