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1/4 watt Panasonic resistors

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dj_theis

Joined: 28 Aug 2017
Posts: 56
Location: Minnesota

Posted: Wed Mar 07, 2018 5:45 pm Post subject: 1/4 watt Panasonic resistors

I am building the Audio Isolation Amplifier detailed on the Aeroelectric Connection.  I purchased some of the residual boards from Bob Nuckolls  in late 2017.  It's been a while since I've done any board level work but I have enough self confidence (justified or not) and experience to not have many concerns with the project.



Anyway, a recent shoulder surgery provided the "free time" to stop working on my plane and spend some quality time with a soldering iron.  I ordered components from Digikey  and received the completed order in just a few days.  I was surprised to find the 1/4 watt resistors appear to be (what I remember from years past) as about the size of 1/8 resistors (i.e. just under 4 mm in length).  



These are mostly Panasonic resistors and when I go to the Panasonic datasheet (also available on the Digikey site) the specification shows that yes, their 1/4 resistors are about the size of what I recall (from years back) as being 1/8 watt resistors.



So, what gives?  Every reference I find on the "web" (other than the Panasonic specification document) shows 1/4 watt resistors about the size of what they were when I last visited a "walk in" Radio Shack store (6 to 8 mm long).



I don't want to go through the trouble of assembling the amplifier if I'm just making an expensive smoke generator.



Any comments the forum can provide would be much appreciated.



Dan Theis.



Sonex 1362

Plans building and enjoying every year of it...

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_________________
Dan Theis
Scratch building Sonex #1362
Still working on the Revmaster Alternator improvement

ceengland7(at)gmail.com
Guest

Posted: Wed Mar 07, 2018 8:45 pm Post subject: 1/4 watt Panasonic resistors

Could be something other than traditional carbon. I wouldn't worry about it. Most of them could probably be smaller than 1/8 watt, anyway.

 Charlie

 On Mar 7, 2018, at 8:50 PM, dj_theis <djtheis58(at)gmail.com (djtheis58(at)gmail.com)> wrote: 	  Quote: 	
		    	  Quote: 	
		  --> AeroElectric-List message posted by: "dj_theis" <djtheis58(at)gmail.com>I am building the Audio Isolation Amplifier detailed on the Aeroelectric Connection.  I purchased some of the residual boards from Bob Nuckolls  in late 2017.  It's been a while since I've done any board level work but I have enough self confidence (justified or not) and experience to not have many concerns with the project.Anyway, a recent shoulder surgery provided the "free time" to stop working on my plane and spend some quality time with a soldering iron.  I ordered components from Digikey  and received the completed order in just a few days.  I was surprised to find the 1/4 watt resistors appear to be (what I remember from years past) as about the size of 1/8 resistors (i.e. just under 4 mm in length).  These are mostly Panasonic resistors and when I go to the Panasonic datasheet (also available on the Digikey site) the specification shows that yes, their 1/4 resistors are about the size of what I recall (from years back) as being 1/8 watt resistors.So, what gives?  Every reference I find on the "web" (other than the Panasonic specification document) shows 1/4 watt resistors about the size of what they were when I last visited a "walk in" Radio Shack store (6 to 8 mm long).I don't want to go through the trouble of assembling the amplifier if I'm just making an expensive smoke generator.Any comments the forum can provide would be much appreciated.Dan Theis.Sonex 1362Plans building and enjoying every year of it...--------Scratch building Sonex #1362Read this topic online here:http://forums.matronics.com/viewtopic.php?p=478491#478491http://www.matronics.com/Navigato="http://www.matronics.com/contribution">http://www.matronics.com/contribution

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Mar 08, 2018 8:21 am Post subject: 1/4 watt Panasonic resistors

At 07:45 PM 3/7/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "dj_theis" <djtheis58(at)gmail.com>



 I am building the Audio Isolation Amplifier detailed on the Aeroelectric Connection.  I purchased some of the residual boards from Bob Nuckolls  in late 2017.  It's been a while since I've done any board level work but I have enough self confidence (justified or not) and experience to not have many concerns with the project.



 Anyway, a recent shoulder surgery provided the "free time" to stop working on my plane and spend some quality time with a soldering iron.  I ordered components from Digikey  and received the completed order in just a few days.  I was surprised to find the 1/4 watt resistors appear to be (what I remember from years past) as about the size of 1/8 resistors (i.e. just under 4 mm in length).  



 These are mostly Panasonic resistors and when I go to the Panasonic datasheet (also available on the Digikey site) the specification shows that yes, their 1/4 resistors are about the size of what I recall (from years back) as being 1/8 watt resistors. 	


    Materials for fabricating components have

    evolved over the years and many components

    have become smaller for their dissipation

    ratings. In any case, NONE of the resistors

    in the amplifier are thermally challenged . . .

    what ever you can find that fits into the

    slot on the board will be fine.



    Let us know how it works out for you.



 

 

   Bob . . .

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wrmaxwell(at)bigpond.com
Guest

Posted: Thu Mar 08, 2018 1:11 pm Post subject: 1/4 watt Panasonic resistors

These days most new           quarter watt resistors are of metal film composition and are           of a size more akin to the 1/8 watters of a few years ago.           They tend to be of tighter tolerance too, thanks to the mode           of manufacture but fortunately are still cheap.     

Bill

          

     On 9/03/2018 3:20 AM, Robert L.       Nuckolls, III wrote:

     

      	  Quote: 	
		         At 07:45 PM 3/7/2018, you wrote:

               	  Quote: 	
		  -->           AeroElectric-List message           posted by: "dj_theis" <djtheis58(at)gmail.com> (djtheis58(at)gmail.com)

           

           I am building the Audio Isolation Amplifier detailed on the           Aeroelectric           Connection.  I purchased some of the residual boards from Bob           Nuckolls  in late 2017.  It's been a while since I've done any           board level work but I have enough self confidence (justified           or not) and           experience to not have many concerns with the project.

           

           Anyway, a recent shoulder surgery provided the "free time" to           stop working on my plane and spend some quality time with a           soldering           iron.  I ordered components from Digikey  and received the           completed order in just a few days.  I was surprised to find           the 1/4           watt resistors appear to be (what I remember from years past)           as about           the size of 1/8 resistors (i.e. just under 4 mm in length).            

           

           These are mostly Panasonic resistors and when I go to the           Panasonic           datasheet (also available on the Digikey site) the           specification shows           that yes, their 1/4 resistors are about the size of what I           recall (from           years back) as being 1/8 watt resistors. 	
       

          Materials for fabricating components have

          evolved over the years and many components

          have become smaller for their dissipation

          ratings. In any case, NONE of the resistors

          in the amplifier are thermally challenged . . .

          what ever you can find that fits into the

          slot on the board will be fine.

       

          Let us know how it works out for you.

       

       

                

             Bob . . .

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