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-   -   What's wrong with this BOM ? (https://www.diybanter.com/electronic-schematics/266441-whats-wrong-bom.html)

Eeyore December 8th 08 04:09 PM

What's wrong with this BOM ?
 
1 Attachment(s)
Fire away. It's the obvious one you should be looking for.

Graham


John Larkin December 8th 08 04:36 PM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham


No date, no revision control, no effectivity, no author, no signoff,
no notes, no apparent assembly breakdown, no ref designators for
cables and fasteners, goofy ref designators.

It's Audio, right?

John




Tom Del Rosso[_3_] December 8th 08 04:53 PM

What's wrong with this BOM ?
 

"Eeyore" wrote in message

Fire away. It's the obvious one you should be looking for.


No resistors, except for a few resistor networks.

The power fuse is 3.2A for Europe and 1.6 for US, which seems backwards for
220 and 110 volts.


--

Reply in group, but if emailing add one more
zero, and remove the last word.



Phil Hobbs December 8th 08 05:13 PM

What's wrong with this BOM ?
 
John Larkin wrote:
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham


No date, no revision control, no effectivity, no author, no signoff,
no notes, no apparent assembly breakdown, no ref designators for
cables and fasteners, goofy ref designators.

It's Audio, right?

John




The US fuse is half the rating of the EU fuse instead of twice.

Cheers,

Phil Hobbs

John Fields December 8th 08 05:25 PM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.


---
The fuse values are backwards.

JF

RST Engineering \(jw\) December 8th 08 05:45 PM

What's wrong with this BOM ?
 
You mean other than it is 22 frikkin' pages long when it could be reduced to
a quarter of that for a true BOM rather that what it is ... a reference
designator list.

Jim

--
"It is the mark of an educated mind to be able to entertain a thought
without accepting it."
--Aristotle


"Eeyore" wrote in message
...
Fire away. It's the obvious one you should be looking for.

Graham




Eeyore December 8th 08 09:41 PM

What's wrong with this BOM ?
 


John Larkin wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham


No date, no revision control, no effectivity, no author, no signoff,
no notes, no apparent assembly breakdown, no ref designators for
cables and fasteners, goofy ref designators.

It's Audio, right?


It's certainly German (you missed the swapped fuse value for USA and
Europe etc btw). And I agree with your general comments but you missed
the biggie.

Graham


Eeyore December 8th 08 09:42 PM

What's wrong with this BOM ?
 


Tom Del Rosso wrote:

"Eeyore" wrote

Fire away. It's the obvious one you should be looking for.


No resistors, except for a few resistor networks.


That's the one. That gave me a little problem recently.


The power fuse is 3.2A for Europe and 1.6 for US, which seems backwards for
220 and 110 volts.


Well spotted there too.

Graham


Eeyore December 8th 08 09:43 PM

What's wrong with this BOM ?
 


Phil Hobbs wrote:

John Larkin wrote:
Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham


No date, no revision control, no effectivity, no author, no signoff,
no notes, no apparent assembly breakdown, no ref designators for
cables and fasteners, goofy ref designators.

It's Audio, right?

John


The US fuse is half the rating of the EU fuse instead of twice.


That's the little mistake ! ;~)

Graham


Eeyore December 8th 08 09:44 PM

What's wrong with this BOM ?
 


John Fields wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.


---
The fuse values are backwards.


They are indeed but you missed the obvious. Admittedly so did I at first
when just flicking through it.

Graham


Eeyore December 8th 08 09:45 PM

What's wrong with this BOM ?
 


"RST Engineering (jw)" wrote:

You mean other than it is 22 frikkin' pages long when it could be reduced to
a quarter of that for a true BOM rather that what it is ... a reference
designator list.


That's another matter entirely ! You'd be amazed that IBM's MRP couldn't handle
reference designators as supplied either.

Graham


John Fields December 8th 08 10:55 PM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 21:44:32 +0000, Eeyore
wrote:



John Fields wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.


---
The fuse values are backwards.


They are indeed but you missed the obvious. Admittedly so did I at first
when just flicking through it.


---
What I meant by 'backwards' was: "wrong way 'round", or "swapped" or
"reversed". What did you think I meant?


JF

Eeyore December 9th 08 12:48 AM

What's wrong with this BOM ?
 


John Fields wrote:

Eeyore wrote:
John Fields wrote:
Eeyore wrote:

Fire away. It's the obvious one you should be looking for.
---
The fuse values are backwards.


They are indeed but you missed the obvious. Admittedly so did I at first
when just flicking through it.

---
What I meant by 'backwards' was: "wrong way 'round", or "swapped" or
"reversed". What did you think I meant?


I understand perfectly and you are correct.

Now find the real flaw.

Graham


Hammy December 9th 08 01:38 AM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham


Whoever did that does know for multiple quantities of the same unit
they can use 2,3 etc in the Qty row,this would save a few trees in
stead of writing 1repetitively in the quantity row over 20 pages.This
would probably cut the page count in half.

It doesnt make sense to me to use 1n4007 rectifiers for the EU device
and 1n4002 for the north American.

Wouldnt it just be cheaper to buy a **** load of 1N4007 and put them
in both the EU product and The north American product? It's not like
the excess 1n4007''s wouldnt be used later.

Hammy December 9th 08 02:02 AM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham

Theres no transformer for the power supply?

Do I get a prize:)

Sjouke Burry[_2_] December 9th 08 02:41 AM

What's wrong with this BOM ?
 
Hammy wrote:
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham

Theres no transformer for the power supply?

Do I get a prize:)

I think this is a stock list for a repair bag, so no powersupply
needed......

Archimedes' Lever December 9th 08 03:56 AM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:



For one thing, the cabinet itself is not listed.

Nothing to attach all those parts to.

No types of reference designations either.

Jasen Betts[_2_] December 9th 08 09:29 AM

What's wrong with this BOM ?
 
On 2008-12-09, Hammy wrote:
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham

Theres no transformer for the power supply?


Page 2, line 15.


Jasen Betts[_2_] December 9th 08 09:33 AM

What's wrong with this BOM ?
 
On 2008-12-09, Archimedes' Lever wrote:
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:



For one thing, the cabinet itself is not listed.


front panel, rear panel, two side wings,

some of those parts may incorporate the top and bottom of the device


Robert Baer[_3_] December 10th 08 03:53 AM

What's wrong with this BOM ?
 
Eeyore wrote:
Fire away. It's the obvious one you should be looking for.

Graham

Err..don't they have the fuses listed backwards?
240V source, 1.5A; 120V source, 3.0A ??

Eeyore December 10th 08 04:39 PM

What's wrong with this BOM ?
 


Hammy wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham


Whoever did that does know for multiple quantities of the same unit
they can use 2,3 etc in the Qty row,this would save a few trees in
stead of writing 1repetitively in the quantity row over 20 pages.This
would probably cut the page count in half.


Agreed.


It doesnt make sense to me to use 1n4007 rectifiers for the EU device
and 1n4002 for the north American.

Wouldnt it just be cheaper to buy a **** load of 1N4007 and put them
in both the EU product and The north American product? It's not like
the excess 1n4007''s wouldnt be used later.


I hadn't even noticed that one ! How bizarre.

Graham



Eeyore December 10th 08 04:40 PM

What's wrong with this BOM ?
 


Hammy wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.


Theres no transformer for the power supply?


They forgot that TOO ?


Do I get a prize:)


Yes, you can take a peek at the latest parts lists they sent me about 3
months too late. ;~)

Graham



Eeyore December 10th 08 04:41 PM

What's wrong with this BOM ?
 


Jasen Betts wrote:

On 2008-12-09, Archimedes' Lever wrote:
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:



For one thing, the cabinet itself is not listed.


front panel, rear panel, two side wings,

some of those parts may incorporate the top and bottom of the device


They do.

Graham



Eeyore December 10th 08 04:43 PM

What's wrong with this BOM ?
 


Robert Baer wrote:

Eeyore wrote:
Fire away. It's the obvious one you should be looking for.


Err..don't they have the fuses listed backwards?
240V source, 1.5A; 120V source, 3.0A ??


I'd say they do. Incidentally this was supplied by one of the supposed
market leaders in the sound re-inforcement business !

Graham



Jim Thompson December 10th 08 05:01 PM

What's wrong with this BOM ?
 

On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham


BOM's should be generated by the schematic capture software... avoids
missing something.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

Michael A. Terrell December 10th 08 05:16 PM

What's wrong with this BOM ?
 

Eeyore wrote:

Hammy wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham


Whoever did that does know for multiple quantities of the same unit
they can use 2,3 etc in the Qty row,this would save a few trees in
stead of writing 1repetitively in the quantity row over 20 pages.This
would probably cut the page count in half.


Agreed.

It doesnt make sense to me to use 1n4007 rectifiers for the EU device
and 1n4002 for the north American.

Wouldnt it just be cheaper to buy a **** load of 1N4007 and put them
in both the EU product and The north American product? It's not like
the excess 1n4007''s wouldnt be used later.


I hadn't even noticed that one ! How bizarre.

Graham



That's why they needed higher current fuses in the European version.


--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

RST Engineering \(jw\) December 10th 08 05:39 PM

What's wrong with this BOM ?
 

BOM's should be generated by the schematic capture software... avoids
missing something.

...Jim Thompson


Makes it a bitchkitty to specify mechanical parts though, doesn't it?

Jim



Jim Thompson December 10th 08 05:58 PM

What's wrong with this BOM ?
 

On Wed, 10 Dec 2008 09:39:10 -0800, "RST Engineering \(jw\)"
wrote:


BOM's should be generated by the schematic capture software... avoids
missing something.

...Jim Thompson


Makes it a bitchkitty to specify mechanical parts though, doesn't it?

Jim


I don't have that problem in the I/C world ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

Eeyore December 10th 08 06:39 PM

What's wrong with this BOM ?
 


Jim Thompson wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham


BOM's should be generated by the schematic capture software... avoids
missing something.


Well I have some time for that view but try transferring it into an MRP
system. EDA ? Hahahahahhahaaha


Eeyore December 10th 08 06:41 PM

What's wrong with this BOM ?
 


"RST Engineering (jw)" wrote:

BOM's should be generated by the schematic capture software... avoids
missing something.

...Jim Thompson


Makes it a bitchkitty to specify mechanical parts though, doesn't it?


Neve had a neat way of dealing with that.

You had a BOM for assy XYZ, then the mechanical parts were assy XYZ-KOP
(kit of parts).

After all, the pcb stuffing machine can't fit them !

Graham


Jim Thompson December 10th 08 06:51 PM

What's wrong with this BOM ?
 

On Wed, 10 Dec 2008 18:39:00 +0000, Eeyore
wrote:



Jim Thompson wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham


BOM's should be generated by the schematic capture software... avoids
missing something.


Well I have some time for that view but try transferring it into an MRP
system. EDA ? Hahahahahhahaaha


The old original MicroSim PSpice Schematics will generate a parts
list.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

Eeyore December 10th 08 07:12 PM

What's wrong with this BOM ?
 


Jim Thompson wrote:

Eeyore wrote:
Jim Thompson wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham

BOM's should be generated by the schematic capture software... avoids
missing something.


Well I have some time for that view but try transferring it into an MRP
system. EDA ? Hahahahahhahaaha


The old original MicroSim PSpice Schematics will generate a parts
list.


Ancient DOS versions of Orcad would generate parts lists with all manner of
detail if you wanted it, just define the part field.

Not sure if it could output it as a .csv though which would be the trick to
getting it easily into MRP.

Graham


John Larkin December 10th 08 07:21 PM

What's wrong with this BOM ?
 
On Wed, 10 Dec 2008 10:58:25 -0700, Jim Thompson
wrote:


On Wed, 10 Dec 2008 09:39:10 -0800, "RST Engineering \(jw\)"
wrote:


BOM's should be generated by the schematic capture software... avoids
missing something.

...Jim Thompson


Makes it a bitchkitty to specify mechanical parts though, doesn't it?


Well, you have to add that stuff. Or put all the hardware on the
schematic!


Jim


I don't have that problem in the I/C world ;-)

...Jim Thompson


You make a BOM for an IC? Transistors, resistors, capacitors, wirebond
leads, pins, epoxy... all have to be pulled from stock?

John


Jim Thompson December 10th 08 08:03 PM

What's wrong with this BOM ?
 

On Wed, 10 Dec 2008 11:21:32 -0800, John Larkin
wrote:

On Wed, 10 Dec 2008 10:58:25 -0700, Jim Thompson
wrote:


On Wed, 10 Dec 2008 09:39:10 -0800, "RST Engineering \(jw\)"
wrote:


BOM's should be generated by the schematic capture software... avoids
missing something.

...Jim Thompson

Makes it a bitchkitty to specify mechanical parts though, doesn't it?


Well, you have to add that stuff. Or put all the hardware on the
schematic!


Jim


I don't have that problem in the I/C world ;-)

...Jim Thompson


You make a BOM for an IC? Transistors, resistors, capacitors, wirebond
leads, pins, epoxy... all have to be pulled from stock?

John


Just to count devices... for chip area estimation. With all the
hierarchical structuring it's hard to just eyeball such stuff. The
schematic capture spits it right out.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food

Michael A. Terrell December 10th 08 08:48 PM

What's wrong with this BOM ?
 

Eeyore wrote:

Jim Thompson wrote:

Eeyore wrote:
Jim Thompson wrote:

Eeyore wrote:

Fire away. It's the obvious one you should be looking for.

Graham

BOM's should be generated by the schematic capture software... avoids
missing something.

Well I have some time for that view but try transferring it into an MRP
system. EDA ? Hahahahahhahaaha


The old original MicroSim PSpice Schematics will generate a parts
list.


Ancient DOS versions of Orcad would generate parts lists with all manner of
detail if you wanted it, just define the part field.

Not sure if it could output it as a .csv though which would be the trick to
getting it easily into MRP.



Microdyne had no problems importing data into their MRP software, or
outputting raw data as tab or comma delimited data. I had several custom
runs given to me on floppies, to create lists for the test bench stock.


--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

Tom Del Rosso[_3_] December 11th 08 04:48 PM

What's wrong with this BOM ?
 

"John Larkin" wrote in
message

You make a BOM for an IC? Transistors, resistors, capacitors, wirebond
leads, pins, epoxy... all have to be pulled from stock?


I guess wirebond has to be pulled from stock. How do they package that I
wonder? Gold wire thinner than a human hair must be wound in some way to
avoid deforming, and how big are the reels?


--

Reply in group, but if emailing add one more
zero, and remove the last word.



John Larkin[_2_] December 13th 08 04:59 AM

What's wrong with this BOM ?
 
On Mon, 08 Dec 2008 12:13:34 -0500, Phil Hobbs
wrote:

John Larkin wrote:
On Mon, 08 Dec 2008 16:09:44 +0000, Eeyore
wrote:

Fire away. It's the obvious one you should be looking for.

Graham


No date, no revision control, no effectivity, no author, no signoff,
no notes, no apparent assembly breakdown, no ref designators for
cables and fasteners, goofy ref designators.

It's Audio, right?

John




The US fuse is half the rating of the EU fuse instead of twice.

Cheers,

Phil Hobbs



Cool. And after that's fixed, we'll have two parts lists, one right
and one wrong, and no obvious way to tell which is which.

John




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