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Digikey substitution on 9021-620

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email(at)jaredyates.com
Guest

Posted: Fri Oct 29, 2010 12:46 pm Post subject: Digikey substitution on 9021-620

On the low voltage warning module the bill of materials calls out a

digikey p2015 and lists that as a 1.0uf 16v tantalum capacitor.

Digikey says that the p2015 is non-stock, but is a 22ufd 6.3v tantalum

capacitor.  Has anyone resolved this discrepancy and found an updated

digikey part number?  This is c111 in the drawings.

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 30, 2010 5:13 am Post subject: Digikey substitution on 9021-620

At 03:41 PM 10/29/2010, you wrote:

 	  Quote: 	
		  



On the low voltage warning module the bill of materials calls out a

digikey p2015 and lists that as a 1.0uf 16v tantalum capacitor.

Digikey says that the p2015 is non-stock, but is a 22ufd 6.3v tantalum

capacitor.  Has anyone resolved this discrepancy and found an updated

digikey part number?  This is c111 in the drawings.


	


   The parts called out on our drawings were components

   suited to the task at the time the device was in

   production. The cataloging of components is in a

   constant state of change. Further, it's not uncommon

   for there to be dozens of components from many

   manufacturers equally suited to the task.



   Launching into a DIY project offers far more than

   the opportunity to melt a little solder. Changes

   in minute details of ingredients that go into the

   recipe for success throw up small challenges to

   venture into the catalogs and find alternatives in

   that have the same or suitably close ratings that

   will still fit on the board.



   In this array of small parts drawers



http://aeroelectric.com/Pictures/Misc/Shop_1.jpg



   there are thousands of components that have been in my

   inventory for anywhere between a few days and 40 years.

   Very few are still offered under the same catalog or

   manufacturer's numbers as the day they were purchased.

   Yet all have capabilities that make them good substitutes

   for their modern descendants.



   The bill of materials in our DIY projects are

   best described as the trail head for an adventure

   in the study of component performance and

   interchangeability.



   Look for any dipped tantalum, 1.0 uF, 16v or

   more that will fit the holes.

   Bob . . .

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email(at)jaredyates.com
Guest

Posted: Sat Oct 30, 2010 7:59 am Post subject: Digikey substitution on 9021-620

Thanks.  If I can substitute the 16v voltage rating there are some choices with higher ratings.  

Relative to the level of adventure required to obtain the circuit boards it should all be downhill from here, right?

On Oct 30, 2010, at 9:12, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:

 	  Quote: 	

 At 03:41 PM 10/29/2010, you wrote:

> 

> 

> On the low voltage warning module the bill of materials calls out a

> digikey p2015 and lists that as a 1.0uf 16v tantalum capacitor.

> Digikey says that the p2015 is non-stock, but is a 22ufd 6.3v tantalum

> capacitor.  Has anyone resolved this discrepancy and found an updated

> digikey part number?  This is c111 in the drawings.

  The parts called out on our drawings were components

  suited to the task at the time the device was in

  production. The cataloging of components is in a

  constant state of change. Further, it's not uncommon

  for there to be dozens of components from many

  manufacturers equally suited to the task.

  Launching into a DIY project offers far more than

  the opportunity to melt a little solder. Changes

  in minute details of ingredients that go into the

  recipe for success throw up small challenges to

  venture into the catalogs and find alternatives in

  that have the same or suitably close ratings that

  will still fit on the board.

  In this array of small parts drawers

 http://aeroelectric.com/Pictures/Misc/Shop_1.jpg

  there are thousands of components that have been in my

  inventory for anywhere between a few days and 40 years.

  Very few are still offered under the same catalog or

  manufacturer's numbers as the day they were purchased.

  Yet all have capabilities that make them good substitutes

  for their modern descendants.

  The bill of materials in our DIY projects are

  best described as the trail head for an adventure

  in the study of component performance and

  interchangeability.

  Look for any dipped tantalum, 1.0 uF, 16v or

  more that will fit the holes.

  Bob . . .

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retasker(at)optonline.net
Guest

Posted: Sat Oct 30, 2010 8:37 am Post subject: Digikey substitution on 9021-620

With capacitors a higher voltage rating is perfectly fine.  Depending on 

the actual circuit design, a lower voltage is sometimes acceptable.  

When I design a circuit I usually pick a readily available capacitor 

with a voltage rating of 2X what it really has to be for safety margin.  

Sometimes the voltage needed is very low and a capacitor is chosen 

solely on availability and cost.



Frequently the value chosen is somewhat arbitrary as well..  It depends 

on what the capacitor is used for in the circuit.  If it is purely for 

voltage filtering or noise reduction, higher value is usually acceptable 

and sometimes better.  If it is part of a precision circuit of some sort 

(timing, filter network such as low-pass, band-pass, etc) the value is 

more critical.



For most commercial or industrial designs the value and voltage is 

chosen based on whatever will do the job required for the least cost.



My $0.02...



Dick Tasker



Jared Yates wrote:

 	  Quote: 	
		   



 Thanks.  If I can substitute the 16v voltage rating there are some choices with higher ratings.

 Relative to the level of adventure required to obtain the circuit boards it should all be downhill from here, right?

 On Oct 30, 2010, at 9:12, "Robert L. Nuckolls, III"<nuckolls.bob(at)aeroelectric.com>  wrote:



    

> 

>

> At 03:41 PM 10/29/2010, you wrote:

>      

>> 

>>

>> On the low voltage warning module the bill of materials calls out a

>> digikey p2015 and lists that as a 1.0uf 16v tantalum capacitor.

>> Digikey says that the p2015 is non-stock, but is a 22ufd 6.3v tantalum

>> capacitor.  Has anyone resolved this discrepancy and found an updated

>> digikey part number?  This is c111 in the drawings.

>>        

>   The parts called out on our drawings were components

>   suited to the task at the time the device was in

>   production. The cataloging of components is in a

>   constant state of change. Further, it's not uncommon

>   for there to be dozens of components from many

>   manufacturers equally suited to the task.

>

>   Launching into a DIY project offers far more than

>   the opportunity to melt a little solder. Changes

>   in minute details of ingredients that go into the

>   recipe for success throw up small challenges to

>   venture into the catalogs and find alternatives in

>   that have the same or suitably close ratings that

>   will still fit on the board.

>

>   In this array of small parts drawers

>

> http://aeroelectric.com/Pictures/Misc/Shop_1.jpg

>

>   there are thousands of components that have been in my

>   inventory for anywhere between a few days and 40 years.

>   Very few are still offered under the same catalog or

>   manufacturer's numbers as the day they were purchased.

>   Yet all have capabilities that make them good substitutes

>   for their modern descendants.

>

>   The bill of materials in our DIY projects are

>   best described as the trail head for an adventure

>   in the study of component performance and

>   interchangeability.

>

>   Look for any dipped tantalum, 1.0 uF, 16v or

>   more that will fit the holes.

>   Bob . . .

>

>

>      



    


	


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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 30, 2010 10:05 am Post subject: Digikey substitution on 9021-620

At 10:55 AM 10/30/2010, you wrote:

 	  Quote: 	
		  



Thanks.  If I can substitute the 16v voltage rating there are some 

choices with higher ratings.

Relative to the level of adventure required to obtain the circuit 

boards it should all be downhill from here, right?


	


  One never knows. 200 years ago our most successful inhabitants

  of the frontier began educating their children in survival lore

  as soon as they could walk and talk. Today not so much. But

  we do have huge resources for materials, recipes for success

  and mentorship along with the communications tools for exploiting

  them.



  I can tell you that even today, a significant number of first,

  second and perhaps third passes at a new endeavor go into my

  trash can before I build one that I can bolt to an airplane.



  If we did not accept a certain amount of risk, then there

  would be no incentive to do anything new . . . and we'd all

  be working on wood, fabric and Model-A powered airplanes.



  So "down hill" ? ? ? Depends on your present tool box of

  skills and experiences. But for sure, staying with this project

  until it plays to your satisfaction will add considerable

  investment capital to invest in future endeavors. If you get

  really jammed up . . .send the assembly to me and I'll put

  the meters to it.

   Bob . . .

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