What happend to 320K resistors ?

[Jan Audio]

response to OP’s claim of there being lots of money to be made in stockpiling “obsolete” resistors. I was explaining why that’s silly,

I say with any parts not resistors.
If you have any type of THT transistor FET etc or opamp or anything becoming obsolete, not resistors.
You can still stockpile them dont worry, and you could make lots of money does not means you gonna make 100% sure alot of money.

[drussell]

It seems very hard to make a 320K resistor like this.

Really?  Two 160k ¹/₈W resistors end to end in series isn't difficult.

1. Twist the leads between the two closely together over a short distance, solder them together and trim the excess lead length, essentially making one ¹/₄W resistor.

2.  Insert into PCB and pretend it is one resistor.   

You can simply "tent" the joined resistors up a bit if you've made the part too long to fit directly between existing holes.  Job done. 

Unless you have very limited space above the PCB this is not a problem.  You can even join the two side-by-side, one going up and one going down to the PCB instead of soldering them end to end.  Resistors are often mounted vertically to save space, there is nothing inherently wrong with standing up a resistor, it's not like they know what orientation they're in.   

[Jan Audio]

Really?  Two 160k ¹/₈W resistors end to end in series isn't difficult.

I like to see that in the picture.

[Monkeh]

Really?  Two 160k ¹/₈W resistors end to end in series isn't difficult.

I like to see that in the picture.

Why not just do it yourself? You could be long finished by now making your two boards.

[Jan Audio]

Please no more reactions.

[AndyC_772]

470k // 1M = 319.728k, which is an error of -0.085%.

Also try 365k // 2.61M = 320.218k, or 332k // 8.87M = 320.022k.

Recommended app: Electrodoc Pro - it has all kinds of useful tools for electronics.

[drussell]

Really?  Two 160k ¹/₈W resistors end to end in series isn't difficult.

I like to see that in the picture.

I'm not sure why you can't picture this in your mind's eye, but okay then... 
Here are two random 680K resistors from in front of me, turned into a 1.36 meg:



You can even just twist them together, solder them into the board, then solder the joint between them and trim the leads.  Easy peasy.

Why not just do it yourself? You could be long finished by now making your two boards.

Indeed.

[Jan Audio]

You could be long finished by now making your two boards.

What boards ?, i dont make anything with this,
i just have some tricks in my trickbox.

[Monkeh]

You could be long finished by now making your two boards.

What boards ?, i dont make anything with this,
i just have some tricks in my trickbox.

So let me get this straight, you're complaining about the expense of buying parts you shouldn't have chosen and don't need?

[JohnnyMalaria]

I'm not sure why you can't picture this in your mind's eye, but okay then... 

OT - not everyone has a mind's eye, including me. It's called aphantasia. It wasn't until I was about 50 that I learned that most people really can create images in their heads. Blew my mind. I can't explain it but, taking the example of the two resistors, I can conceive it in my mind and know what it's all about but I don't visualize anything. (But I can see in perfect 3D with one eye...)

[drussell]

You could be long finished by now making your two boards.

What boards ?, i dont make anything with this,
i just have some tricks in my trickbox.

So let me get this straight, you're complaining about the expense of buying parts you shouldn't have chosen and don't need?

Yeah... Yup...  Pretty much...   

For some unknown reason, instead of just ignoring this thread from the get-go, I've been watching with 

[drussell]

I'm not sure why you can't picture this in your mind's eye, but okay then... 

OT - not everyone has a mind's eye, including me. It's called aphantasia. It wasn't until I was about 50 that I learned that most people really can create images in their heads. Blew my mind. I can't explain it but, taking the example of the two resistors, I can conceive it in my mind and know what it's all about but I don't visualize anything.

I realize that someone might not be able to fully "visualize" a concept, especially one that is outside what they have really ever considered before, which is why I have no problem posting a picture of what I'm talking about.  I just didn't expect that the idea of putting two resistors physically in series would be any sort of an abstract concept.  There are many physical forms to easily achieve the desired result.

(As to the sanity of stressing over the absolutely precise, <1% accuracy of a poorly chosen component value in this specific type of circuit, I am less sure.  Why something like a 316 or 324 or somesuch value wouldn't be considered completely adequate and appropriate in a 6-bit DAC circuit, let alone choosing more sane values in the first place, I have no idea.   )

[drussell]

It seems very hard to make a 320K resistor like this.

470k // 1M = 319.728k, which is an error of -0.085%.

Also try 365k // 2.61M = 320.218k, or 332k // 8.87M = 320.022k.

Indeed.

I'm not sure why the OP is so obsessed with such tight tolerance of this particular value, but even a paralleled set of commonly available 560K and 750K values gets more than close enough for any reason which I can conceive of.

[drussell]

It seems very hard to make a 320K resistor like this.

If you can live with 320.5K then you could use 390K and 1.8M in parallel. Both are E12 values.

As long as you get 1% or better spec'd resistors you could obviously use a bunch of different combinations, and sure, many common values are available in even tighter tolerance versions which you can use for getting unnecessarily close to some particular value if you wish.  I still don't think the OP is actually trying to create a .01% accurate 6-bit DAC, even though they seem to think they are.   

Usually when precise matching is required, binned testing of incoming lower-tolerance yet stable components would be sorted into matched pairs/quads or whatever and then specifically indicated as selected components on the schematics and BOM.

It still seems silly that the OP is "needing" something so precise in the first place, given the tolerance of typical components used in such situations, but...   

[Jan Audio]

So let me get this straight, you're complaining about the expense of buying parts you shouldn't have chosen and don't need?

Yes.

[Zero999]

So let me get this straight, you're complaining about the expense of buying parts you shouldn't have chosen and don't need?

Yes.

Please no more reactions.

Why ask then?

There are plenty of resistor combinations to give 320k. Use the calculator linked below, to work it out for you.
http://jansson.us/resistors.html

[coppercone2]

you know maybe he is trying to sell this thing and someone just does not want a bodge in a finished system

it looks bad. its like sending something with a crooked decal.

just buy this,
https://www.mouser.com/ProductDetail/Vishay-Dale/RN55C3203BB14/?qs=sGAEpiMZZMsPqMdJzcrNwvkdYAxQ3%2Fr%2Fs3q5pENnkCQ%3D

and end this thread. its like watching a beat down in slow motion
glue it in an copper tube to increase dissipation to make a really small heat sink if you must, just end this thread, its painful at this point

i would say even make a custom heat sink for a small axial resistor, just stop this war.

https://www.ebay.com/itm/Lot-of-Vishay-Dale-320K-Ohm-1-2-Watt-1-Metal-Film-Resistors/203140201001?hash=item2f4c197a29:g:lj0AAOSwy0tfh0lr

this thread is pure bias, i feel like im watching the goverment try to enforce a modernization policy in a soviet country

i recall there being like a 500 page thread about equipment knobs (you can get by using a dowel) but a resistor is turns into ww3

[tooki]

you know maybe he is trying to sell this thing and someone just does not want a bodge in a finished system

But the OP already said they don’t actually have an application for it, it’s purely hypothetical.

[coppercone2]

i think its a custom design for sale to someone that likes audio

[Monkeh]

i think its a custom design for sale to someone that likes audio

I think you're reaching to justify your indignation.

[Jan Audio]

this thread is pure bias, i feel like im watching the goverment try to enforce a modernization policy in a soviet country

Amerikan style, no listening, just harder screaming.
Dont wanto start ww3 for a resistor.

Remember this is in general technical chat, not beginners or projects, dont force me any more help please.

[TimFox]

Actually, the majority of recent replies that seem to mock you, as opposed to those who suggest possible solutions to your original problem, are from non-American members.
In the US, the spelling "Amerikan" is used in political circles to suggest bad things about other writers.

[JohnnyMalaria]

this thread is pure bias, i feel like im watching the goverment try to enforce a modernization policy in a soviet country

Amerikan style, no listening, just harder screaming.
Dont wanto start ww3 for a resistor.

Remember this is in general technical chat, not beginners or projects, dont force me any more help please.

You can stop this thread showing up...

[Jan Audio]

In the US, the spelling "Amerikan" is used in political circles to suggest bad things about other writers.

Ok learning everyday.
America = Amerika in dutch.

Dont wanto be racist, i better remove the political statement its not allowed.

[DrG]

this thread is pure bias, i feel like im watching the goverment try to enforce a modernization policy in a soviet country

Amerikan style, no listening, just harder screaming.
Dont wanto start ww3 for a resistor.

Remember this is in general technical chat, not beginners or projects, dont force me any more help please.

Maybe you could get a job un-ringing bells and they could pay you in 320K resistors?