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tech / sci.electronics.design / Where can one get parts these days?

SubjectAuthor
* Where can one get parts these days?neo5...@gmail.com
+* Re: Where can one get parts these days?John S
|+* Re: Where can one get parts these days?jlarkin
||`- Re: Where can one get parts these days?Phil Hobbs
|`- Re: Where can one get parts these days?John Robertson
+* Re: Where can one get parts these days?Lasse Langwadt Christensen
|`- Re: Where can one get parts these days?Klaus Kragelund
+* Re: Where can one get parts these days?rbowman
|+* Re: Where can one get parts these days?John Doe
||`- Re: Where can one get parts these days?rbowman
|`* Re: Where can one get parts these days?DecadentLinuxUserNumeroUno
| `- Re: Where can one get parts these days?rbowman
`* Re: Where can one get parts these days?jlarkin
 +* Re: Where can one get parts these days?Tabby
 |+* Re: Where can one get parts these days?jlarkin
 ||`* Re: Where can one get parts these days?DecadentLinuxUserNumeroUno
 || `* Re: Where can one get parts these days?John Larkin
 ||  `* Re: Where can one get parts these days?whit3rd
 ||   `- Re: Where can one get parts these days?John Larkin
 |`- Re: Where can one get parts these days?DecadentLinuxUserNumeroUno
 `* Re: Where can one get parts these days?Clive Arthur
  +* Re: Where can one get parts these days?Phil Hobbs
  |`* Re: Where can one get parts these days?jlarkin
  | +- Re: Where can one get parts these days?Phil Hobbs
  | `* Re: Where can one get parts these days?Clive Arthur
  |  `- Re: Where can one get parts these days?John Larkin
  `- Re: Where can one get parts these days?jlarkin

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Where can one get parts these days?

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Subject: Where can one get parts these days?
From: neo5b...@gmail.com (neo5...@gmail.com)
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 by: neo5...@gmail.com - Fri, 22 Apr 2022 15:02 UTC

I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
Are there any places selling basic components besides E-Bay?

Thanks

Don

Re: Where can one get parts these days?

<t3ug70$lob$1@dont-email.me>

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From: Soph...@invalid.org (John S)
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Subject: Re: Where can one get parts these days?
Date: Fri, 22 Apr 2022 10:04:57 -0500
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 by: John S - Fri, 22 Apr 2022 15:04 UTC

On 4/22/2022 10:02 AM, neo5...@gmail.com wrote:
> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
> Are there any places selling basic components besides E-Bay?
>
> Thanks
>
> Don

Mouser
Digikey

If you can't find it in one of those two places, then you don't need it.

Re: Where can one get parts these days?

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Subject: Re: Where can one get parts these days?
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 by: jlar...@highlandsniptechnology.com - Fri, 22 Apr 2022 15:56 UTC

On Fri, 22 Apr 2022 10:04:57 -0500, John S <Sophi.2@invalid.org>
wrote:

>On 4/22/2022 10:02 AM, neo5...@gmail.com wrote:
>> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>> Are there any places selling basic components besides E-Bay?
>>
>> Thanks
>>
>> Don
>
>Mouser
>Digikey
>
>If you can't find it in one of those two places, then you don't need it.

There is a surprising variety of parts from Amazon and even WalMart.

--

I yam what I yam - Popeye

Re: Where can one get parts these days?

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Subject: Re: Where can one get parts these days?
From: langw...@fonz.dk (Lasse Langwadt Christensen)
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 by: Lasse Langwadt Chris - Fri, 22 Apr 2022 16:02 UTC

fredag den 22. april 2022 kl. 17.02.10 UTC+2 skrev neo5...@gmail.com:
> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
> Are there any places selling basic components besides E-Bay?

lcsc.com

Re: Where can one get parts these days?

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 by: John Robertson - Fri, 22 Apr 2022 16:16 UTC

On 2022/04/22 8:04 a.m., John S wrote:
> On 4/22/2022 10:02 AM, neo5...@gmail.com wrote:
>> I suspect if a real source is around, no one wants to tell, but I am
>> having a hard time trying to get simple passive components. Melf
>> resistors, Pulse resistant resistors stuff like that.
>> Are there any places selling basic components besides E-Bay?
>>
>> Thanks
>>
>> Don
>
> Mouser
> Digikey
>
> If you can't find it in one of those two places, then you don't need it.

Unless you are into restoring classic (pre-1990) equipment that is...

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

Re: Where can one get parts these days?

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Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
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 by: Klaus Kragelund - Fri, 22 Apr 2022 20:23 UTC

22.04.22 19:02, Lasse Langwadt Christensen wrote:
>fredag den 22. april 2022 kl. 17.02.10 UTC+2 skrev neo5...@gmail.com:
>> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>> Are there any places selling basic components besides E-Bay?
>
>lcsc.com
Schhh. You are destroying the last reserve

--
Klaus

Re: Where can one get parts these days?

<jcmf7vF227cU1@mid.individual.net>

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From: bow...@montana.com (rbowman)
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Subject: Re: Where can one get parts these days?
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 by: rbowman - Mon, 25 Apr 2022 02:27 UTC

On 04/22/2022 09:02 AM, neo5...@gmail.com wrote:
> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
> Are there any places selling basic components besides E-Bay?
>
> Thanks
>
> Don
>
https://www.newark.com/
https://www.digikey.com/
https://www.allelectronics.com/

You didn't mention where you are. Newark has a UK warehouse but I don't
know how much they stock. DigiKey runs more toward digital devices as
you might guess. All Electronics is a bit strange. I think they're the
OddLots of the electronics world but sometimes you get lucky and find
something useful at a good price.

Re: Where can one get parts these days?

<t4518l$gtg$11@dont-email.me>

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Subject: Re: Where can one get parts these days?
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 by: John Doe - Mon, 25 Apr 2022 02:32 UTC

rbowman wrote:

> https://www.newark.com/
> https://www.digikey.com/
> https://www.allelectronics.com/
>
> You didn't mention where you are. Newark has a UK warehouse but I don't
> know how much they stock. DigiKey runs more toward digital devices as
> you might guess. All Electronics is a bit strange. I think they're the
> OddLots of the electronics world but sometimes you get lucky and find
> something useful at a good price.

Is Mouser Electronics not in the ballpark?

Re: Where can one get parts these days?

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Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
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 by: Decadent...@decadence.org - Mon, 25 Apr 2022 02:53 UTC

rbowman <bowman@montana.com> wrote in
news:jcmf7vF227cU1@mid.individual.net:

> On 04/22/2022 09:02 AM, neo5...@gmail.com wrote:
>> I suspect if a real source is around, no one wants to tell, but I
>> am having a hard time trying to get simple passive components.
>> Melf resistors, Pulse resistant resistors stuff like that. Are
>> there any places selling basic components besides E-Bay?
>>
>> Thanks
>>
>> Don
>>
> https://www.newark.com/
> https://www.digikey.com/
> https://www.allelectronics.com/
>
> You didn't mention where you are. Newark has a UK warehouse but I
> don't know how much they stock. DigiKey runs more toward digital
> devices as you might guess. All Electronics is a bit strange. I
> think they're the OddLots of the electronics world but sometimes
> you get lucky and find something useful at a good price.
>
>

"Stackpole" makes hi rel carbon comp resistors with pulse tolerant
resistive media formulations.

Re: Where can one get parts these days?

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In-Reply-To: <t4518l$gtg$11@dont-email.me>
 by: rbowman - Mon, 25 Apr 2022 05:45 UTC

On 04/24/2022 08:32 PM, John Doe wrote:
> rbowman wrote:
>
>> https://www.newark.com/
>> https://www.digikey.com/
>> https://www.allelectronics.com/
>>
>> You didn't mention where you are. Newark has a UK warehouse but I don't
>> know how much they stock. DigiKey runs more toward digital devices as
>> you might guess. All Electronics is a bit strange. I think they're the
>> OddLots of the electronics world but sometimes you get lucky and find
>> something useful at a good price.
>
> Is Mouser Electronics not in the ballpark?
>

Definitely.

Re: Where can one get parts these days?

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From: bow...@montana.com (rbowman)
Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
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 by: rbowman - Mon, 25 Apr 2022 05:49 UTC

On 04/24/2022 08:53 PM, DecadentLinuxUserNumeroUno@decadence.org wrote:
> rbowman <bowman@montana.com> wrote in
> news:jcmf7vF227cU1@mid.individual.net:
>
>> On 04/22/2022 09:02 AM, neo5...@gmail.com wrote:
>>> I suspect if a real source is around, no one wants to tell, but I
>>> am having a hard time trying to get simple passive components.
>>> Melf resistors, Pulse resistant resistors stuff like that. Are
>>> there any places selling basic components besides E-Bay?
>>>
>>> Thanks
>>>
>>> Don
>>>
>> https://www.newark.com/
>> https://www.digikey.com/
>> https://www.allelectronics.com/
>>
>> You didn't mention where you are. Newark has a UK warehouse but I
>> don't know how much they stock. DigiKey runs more toward digital
>> devices as you might guess. All Electronics is a bit strange. I
>> think they're the OddLots of the electronics world but sometimes
>> you get lucky and find something useful at a good price.
>>
>>
>
> "Stackpole" makes hi rel carbon comp resistors with pulse tolerant
> resistive media formulations.
>

Yeah, but the question was where to buy them.

https://www.arrow.com/en

Another one I forgot about.

Re: Where can one get parts these days?

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Subject: Re: Where can one get parts these days?
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 by: jlar...@highlandsniptechnology.com - Mon, 25 Apr 2022 13:58 UTC

On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
<neo5bass@gmail.com> wrote:

>I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>Are there any places selling basic components besides E-Bay?
>
>Thanks
>
>Don

Why melfs?

The x-chapters (H+H) have some great data on resistor overload.

--

I yam what I yam - Popeye

Re: Where can one get parts these days?

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From: pcdhSpam...@electrooptical.net (Phil Hobbs)
Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
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 by: Phil Hobbs - Mon, 25 Apr 2022 22:57 UTC

jlarkin@highlandsniptechnology.com wrote:
> On Fri, 22 Apr 2022 10:04:57 -0500, John S <Sophi.2@invalid.org>
> wrote:
>
>> On 4/22/2022 10:02 AM, neo5...@gmail.com wrote:
>>> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>>> Are there any places selling basic components besides E-Bay?
>>>
>>> Thanks
>>>
>>> Don
>>
>> Mouser
>> Digikey
>>
>> If you can't find it in one of those two places, then you don't need it.
>
> There is a surprising variety of parts from Amazon and even WalMart.
>
>
>
A plug for the metasearch engines: octopart.com, findchips.com,
oemstrade.com.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

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Subject: Re: Where can one get parts these days?
From: tabbyp...@gmail.com (Tabby)
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 by: Tabby - Tue, 26 Apr 2022 13:12 UTC

On Monday, 25 April 2022 at 14:58:45 UTC+1, jla...@highlandsniptechnology.com wrote:
> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
> <neo5...@gmail.com> wrote:
>
> >I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
> >Are there any places selling basic components besides E-Bay?
> >
> >Thanks
> >
> >Don
> Why melfs?
>
> The x-chapters (H+H) have some great data on resistor overload.

always hated how milf resistors roll off the board if not glued.

Re: Where can one get parts these days?

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 by: jlar...@highlandsniptechnology.com - Tue, 26 Apr 2022 14:07 UTC

On Tue, 26 Apr 2022 06:12:36 -0700 (PDT), Tabby <tabbypurr@gmail.com>
wrote:

>On Monday, 25 April 2022 at 14:58:45 UTC+1, jla...@highlandsniptechnology.com wrote:
>> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
>> <neo5...@gmail.com> wrote:
>>
>> >I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>> >Are there any places selling basic components besides E-Bay?
>> >
>> >Thanks
>> >
>> >Don
>> Why melfs?
>>
>> The x-chapters (H+H) have some great data on resistor overload.
>
>always hated how milf resistors roll off the board if not glued.

Pick-and-place machines don't like them either.

Silly concept.

Here's an instrument with a strange mix of melfs and normal parts.

https://www.dropbox.com/sh/zx1zj4a3uxfvw18/AABzb61Kobc0-6NS9Co8MRTXa?dl=0

--

Anybody can count to one.

- Robert Widlar

Re: Where can one get parts these days?

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 by: Decadent...@decadence.org - Tue, 26 Apr 2022 20:02 UTC

Tabby <tabbypurr@gmail.com> wrote in
news:fad3b7e4-fb8b-48e5-909d-0caa638ea577n@googlegroups.com:

> On Monday, 25 April 2022 at 14:58:45 UTC+1,
> jla...@highlandsniptechnology.com wrote:
>> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
>> <neo5...@gmail.com> wrote:
>>
>> >I suspect if a real source is around, no one wants to tell, but
>> >I am having a hard time trying to get simple passive components.
>> >Melf resistors, Pulse resistant resistors stuff like that. Are
>> >there any places selling basic components besides E-Bay?
>> >
>> >Thanks
>> >
>> >Don
>> Why melfs?
>>
>> The x-chapters (H+H) have some great data on resistor overload.
>
> always hated how milf resistors roll off the board if not glued.
>

I am sure that even a soldered milf resistor could heat up and
reflow its solder and get knocked loose too.

It is easy enough to fashion the leads of an axial leaded carbon
comp resositor to attach to a pair of SMD pads. I have done so, in
fact. Even done so with HV feedback resistors Protruding lead ends
and HV potentials do not always mix well.

We "bump soldered" a lot of parts in the HV sections of our
designs. After soldering normally perform quick additions of more
solder to form a bead of solder at the node. Cannot do it too slow
or it wicks into the hole just as normal. Makes for a less noisy
output as well. Corona isn't just a glowing halo.

Re: Where can one get parts these days?

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 by: Decadent...@decadence.org - Tue, 26 Apr 2022 20:50 UTC

jlarkin@highlandsniptechnology.com wrote in
news:cmuf6hl3nff5nmv89ocilj0kdbjnujc8gj@4ax.com:

> Pick-and-place machines don't like them either.
>
Depends on the pick head used. D'Oh!

> Silly concept.

Brainless assessor. Silly assessment. Par for the course for you,
Johnny.

They were to replicate the design and features of glass encapsulated,
hermetically sealed components like diodes and such.

Re: Where can one get parts these days?

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 by: John Larkin - Tue, 26 Apr 2022 21:13 UTC

On Tue, 26 Apr 2022 20:50:58 -0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org wrote:

>jlarkin@highlandsniptechnology.com wrote in
>news:cmuf6hl3nff5nmv89ocilj0kdbjnujc8gj@4ax.com:
>
>> Pick-and-place machines don't like them either.
>>
> Depends on the pick head used. D'Oh!
>
>> Silly concept.
>
> Brainless assessor. Silly assessment. Par for the course for you,
>Johnny.

Do you design with melfs? Why?

>
> They were to replicate the design and features of glass encapsulated,
>hermetically sealed components like diodes and such.

Why?

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

Re: Where can one get parts these days?

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Date: Thu, 28 Apr 2022 20:03:56 -0700 (PDT)
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Subject: Re: Where can one get parts these days?
From: whit...@gmail.com (whit3rd)
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 by: whit3rd - Fri, 29 Apr 2022 03:03 UTC

On Tuesday, April 26, 2022 at 2:13:58 PM UTC-7, John Larkin wrote:
> On Tue, 26 Apr 2022 20:50:58 -0000 (UTC),
> DecadentLinux...@decadence.org wrote:

> Do you design with melfs? Why?
> >
> > They were to replicate the design and features of glass encapsulated,
> >hermetically sealed components like diodes and such.

> Why?

The glass package is thermally better than epoxies (or used to be)
and extremely well sealed against contaminants. Classic diode test: run
ten or twenty amps through a 1N4007 until you hear a 'pow' and see smoke.
Then put it on a curve tracer. It still works normally (underneath the epoxy,
the package was plug-sealed glass). The epoxy is burnt and cracked, though.

Re: Where can one get parts these days?

<t4g952$fbb$1@dont-email.me>

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From: cli...@nowaytoday.co.uk (Clive Arthur)
Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
Date: Fri, 29 Apr 2022 09:54:56 +0100
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 by: Clive Arthur - Fri, 29 Apr 2022 08:54 UTC

On 25/04/2022 14:58, jlarkin@highlandsniptechnology.com wrote:
> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
> <neo5bass@gmail.com> wrote:
>
>> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>> Are there any places selling basic components besides E-Bay?
>>
>> Thanks
>>
>> Don
>
> Why melfs?
>
> The x-chapters (H+H) have some great data on resistor overload.

MELFs dissipate more for a given footprint and can take a bigger solder
fillet which holds them in place better under high vibration,
particularly when the solder's weakened at high temperatures, and if
potted, there's more body for the potting to hold.

They're also much prettier.

Personally, I find them easier to handle if I have to replace one
because there's more to grip, but that's a trivial concern.

But they have been noticeably harder to obtain for a few years.

Q. Were MELFs originally made that way because they're essentially
leaded parts without the leads? [It goes full circle - chop open a
leaded dipped ceramic capacitor and you'll often find inside a surface
mount part with leads soldered/welded on.]

--
Cheers
Clive

Re: Where can one get parts these days?

<t4gs1d$171g$4@gioia.aioe.org>

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From: pcdhSpam...@electrooptical.net (Phil Hobbs)
Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
Date: Fri, 29 Apr 2022 10:17:17 -0400
Organization: Aioe.org NNTP Server
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 by: Phil Hobbs - Fri, 29 Apr 2022 14:17 UTC

Clive Arthur wrote:
> On 25/04/2022 14:58, jlarkin@highlandsniptechnology.com wrote:
>> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
>> <neo5bass@gmail.com> wrote:
>>
>>> I suspect if a real source is around, no one wants to tell, but I am
>>> having a hard time trying to get simple passive components. Melf
>>> resistors, Pulse resistant resistors stuff like that.
>>> Are there any places selling basic components besides E-Bay?
>>>
>>> Thanks
>>>
>>> Don
>>
>> Why melfs?
>>
>> The x-chapters (H+H) have some great data on resistor overload.
>
> MELFs dissipate more for a given footprint and can take a bigger solder
> fillet which holds them in place better under high vibration,
> particularly when the solder's weakened at high temperatures, and if
> potted, there's more body for the potting to hold.
>
> They're also much prettier.
>
> Personally, I find them easier to handle if I have to replace one
> because there's more to grip, but that's a trivial concern.
>
> But they have been noticeably harder to obtain for a few years.
>
> Q. Were MELFs originally made that way because they're essentially
> leaded parts without the leads?  [It goes full circle - chop open a
> leaded dipped ceramic capacitor and you'll often find inside a surface
> mount part with leads soldered/welded on.]

Yup. At one point some bright outfit was selling MELFs with square end
caps to prevent them from rolling around. Dunno if they're still available.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Re: Where can one get parts these days?

<s8tn6hh2c2g0j0c7i94q2am0aou40vts97@4ax.com>

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Subject: Re: Where can one get parts these days?
Date: Fri, 29 Apr 2022 07:24:43 -0700
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 by: jlar...@highlandsniptechnology.com - Fri, 29 Apr 2022 14:24 UTC

On Fri, 29 Apr 2022 09:54:56 +0100, Clive Arthur
<clive@nowaytoday.co.uk> wrote:

>On 25/04/2022 14:58, jlarkin@highlandsniptechnology.com wrote:
>> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
>> <neo5bass@gmail.com> wrote:
>>
>>> I suspect if a real source is around, no one wants to tell, but I am having a hard time trying to get simple passive components. Melf resistors, Pulse resistant resistors stuff like that.
>>> Are there any places selling basic components besides E-Bay?
>>>
>>> Thanks
>>>
>>> Don
>>
>> Why melfs?
>>
>> The x-chapters (H+H) have some great data on resistor overload.
>
>MELFs dissipate more for a given footprint and can take a bigger solder
>fillet which holds them in place better under high vibration,
>particularly when the solder's weakened at high temperatures, and if
>potted, there's more body for the potting to hold.
>
>They're also much prettier.
>
>Personally, I find them easier to handle if I have to replace one
>because there's more to grip, but that's a trivial concern.
>
>But they have been noticeably harder to obtain for a few years.
>
>Q. Were MELFs originally made that way because they're essentially
>leaded parts without the leads? [It goes full circle - chop open a
>leaded dipped ceramic capacitor and you'll often find inside a surface
>mount part with leads soldered/welded on.]

https://i.chzbgr.com/full/6919676928/h2C8459FA/melf

--

Anybody can count to one.

- Robert Widlar

Re: Where can one get parts these days?

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 by: jlar...@highlandsniptechnology.com - Fri, 29 Apr 2022 14:38 UTC

On Fri, 29 Apr 2022 10:17:17 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>Clive Arthur wrote:
>> On 25/04/2022 14:58, jlarkin@highlandsniptechnology.com wrote:
>>> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
>>> <neo5bass@gmail.com> wrote:
>>>
>>>> I suspect if a real source is around, no one wants to tell, but I am
>>>> having a hard time trying to get simple passive components. Melf
>>>> resistors, Pulse resistant resistors stuff like that.
>>>> Are there any places selling basic components besides E-Bay?
>>>>
>>>> Thanks
>>>>
>>>> Don
>>>
>>> Why melfs?
>>>
>>> The x-chapters (H+H) have some great data on resistor overload.
>>
>> MELFs dissipate more for a given footprint and can take a bigger solder
>> fillet which holds them in place better under high vibration,
>> particularly when the solder's weakened at high temperatures, and if
>> potted, there's more body for the potting to hold.
>>
>> They're also much prettier.
>>
>> Personally, I find them easier to handle if I have to replace one
>> because there's more to grip, but that's a trivial concern.
>>
>> But they have been noticeably harder to obtain for a few years.
>>
>> Q. Were MELFs originally made that way because they're essentially
>> leaded parts without the leads?  [It goes full circle - chop open a
>> leaded dipped ceramic capacitor and you'll often find inside a surface
>> mount part with leads soldered/welded on.]
>
>Yup. At one point some bright outfit was selling MELFs with square end
>caps to prevent them from rolling around. Dunno if they're still available.
>
>Cheers
>
>Phil Hobbs

There are some diodes like that, thin end plates.

Hard potting compounds sometimes expand as they cure, and cure
non-uniformly. Imagine potting getting under such a melf and
fracturing the skinny pin plating.

https://www.apogeeweb.net/ModelImgs/BigIMG/J/JAN1N5811US.jpg

Potting is bad news in general.

--

Anybody can count to one.

- Robert Widlar

Re: Where can one get parts these days?

<fdf61fc3-7ca4-e116-e139-d8f49836e433@electrooptical.net>

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From: pcdhSpam...@electrooptical.net (Phil Hobbs)
Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
Date: Fri, 29 Apr 2022 11:30:50 -0400
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 by: Phil Hobbs - Fri, 29 Apr 2022 15:30 UTC

jlarkin@highlandsniptechnology.com wrote:
> On Fri, 29 Apr 2022 10:17:17 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> Clive Arthur wrote:
<snip>
>>> Q. Were MELFs originally made that way because they're essentially
>>> leaded parts without the leads?  [It goes full circle - chop open a
>>> leaded dipped ceramic capacitor and you'll often find inside a surface
>>> mount part with leads soldered/welded on.]
>>
>> Yup. At one point some bright outfit was selling MELFs with square end
>> caps to prevent them from rolling around. Dunno if they're still available.
>>
>
> There are some diodes like that, thin end plates.
>
> Hard potting compounds sometimes expand as they cure, and cure
> non-uniformly. Imagine potting getting under such a melf and
> fracturing the skinny pin plating.
>
> https://www.apogeeweb.net/ModelImgs/BigIMG/J/JAN1N5811US.jpg
>
> Potting is bad news in general.

"Doctor, Doctor, it hurts when I go like this!"
"So don't go like that." ;)

I don't recall seeing compounds that don't shrink at least a little.
Having one expand might be pretty ugly. OTOH hard potting compounds can
do things like crushing trimpots and electrolytics, so IIRC the wisdom
is to pot the component side in a thin layer of soft, noncorrosive RTV
before putting the epoxy on it.

I've sometimes used conformal coatings, but never potting.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Re: Where can one get parts these days?

<t4h3nb$9p2$1@dont-email.me>

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From: cli...@nowaytoday.co.uk (Clive Arthur)
Newsgroups: sci.electronics.design
Subject: Re: Where can one get parts these days?
Date: Fri, 29 Apr 2022 17:28:25 +0100
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 by: Clive Arthur - Fri, 29 Apr 2022 16:28 UTC

On 29/04/2022 15:38, jlarkin@highlandsniptechnology.com wrote:
> On Fri, 29 Apr 2022 10:17:17 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> Clive Arthur wrote:
>>> On 25/04/2022 14:58, jlarkin@highlandsniptechnology.com wrote:
>>>> On Fri, 22 Apr 2022 08:02:05 -0700 (PDT), "neo5...@gmail.com"
>>>> <neo5bass@gmail.com> wrote:
>>>>
>>>>> I suspect if a real source is around, no one wants to tell, but I am
>>>>> having a hard time trying to get simple passive components. Melf
>>>>> resistors, Pulse resistant resistors stuff like that.
>>>>> Are there any places selling basic components besides E-Bay?
>>>>>
>>>>> Thanks
>>>>>
>>>>> Don
>>>>
>>>> Why melfs?
>>>>
>>>> The x-chapters (H+H) have some great data on resistor overload.
>>>
>>> MELFs dissipate more for a given footprint and can take a bigger solder
>>> fillet which holds them in place better under high vibration,
>>> particularly when the solder's weakened at high temperatures, and if
>>> potted, there's more body for the potting to hold.
>>>
>>> They're also much prettier.
>>>
>>> Personally, I find them easier to handle if I have to replace one
>>> because there's more to grip, but that's a trivial concern.
>>>
>>> But they have been noticeably harder to obtain for a few years.
>>>
>>> Q. Were MELFs originally made that way because they're essentially
>>> leaded parts without the leads?  [It goes full circle - chop open a
>>> leaded dipped ceramic capacitor and you'll often find inside a surface
>>> mount part with leads soldered/welded on.]
>>
>> Yup. At one point some bright outfit was selling MELFs with square end
>> caps to prevent them from rolling around. Dunno if they're still available.
>>
>> Cheers
>>
>> Phil Hobbs
>
> There are some diodes like that, thin end plates.
>
> Hard potting compounds sometimes expand as they cure, and cure
> non-uniformly. Imagine potting getting under such a melf and
> fracturing the skinny pin plating.
>
> https://www.apogeeweb.net/ModelImgs/BigIMG/J/JAN1N5811US.jpg
>
> Potting is bad news in general.

It's horrible, but necessary in high shock/vibration equipment. We use
RTV, as far as I know everyone does for high temperature high shock.

[Actually, it's easier to clean a MELF populated board properly too,
though that's a very marginal advantage as there will always be lots of
'ordinary' SM parts too.]

--
Cheers
Clive

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server_pubkey.txt

rocksolid light 0.9.7
clearnet tor