57.6KOhm Resistor 'Carbon Composite'
- pre65
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#16 Re: 57.6KOhm Resistor 'Carbon Composite'
There is a web site that has calculators to sort out series and parallel resistor values.
IF you have the time and patience you may get nearer to 57.6K ohm than the earlier example I gave.
https://www.electronics2000.co.uk/calc/
IF you have the time and patience you may get nearer to 57.6K ohm than the earlier example I gave.
https://www.electronics2000.co.uk/calc/
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#17 Re: 57.6KOhm Resistor 'Carbon Composite'
It sort of doesn't matter, you can't make a 0.1% resistor by combining 1% resistors. You will still have to measure them with a device that has at least 0.1% accuracy. You don't say what tolerance you actually need, and assuming you haven't got a meter that is calibrated AND accurate to the required tolerance, your best option is to buy a high tolerance metal film 57k6 resistor and use a bridge (simple to make especially for resistors) to match one or more carbon comp to your known reference standard.There is a web site that has calculators to sort out series and parallel resistor values.
This will get you to 0.1%The tighter the tolerance the better.
https://uk.rs-online.com/web/p/through- ... s/7546702/
Beyond that starts to cost.
The fact that the value looks like a E96 one suggests that whatever the actual value wanted, the designer picked from a 1% range to get the closest to the actual desired value, so in practice using more that 1% will just be giving you a higher accuracy copy than the thing that's being copied.
The advantage that higher than 1% will give you is potentially better matching if you have more than one channel. Of course if the resistor is part of a network, then there is no point in using a 0.1% part if its combined with 2% parts. Again, selecting against a known standard or a calibrated meter is the best way, though an un-calibrated meter is fine if you just care about channel matching.
If you really want to enter the world of metrology talk to Andrew L.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Mike H
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#18 Re: 57.6KOhm Resistor 'Carbon Composite'
Just had a thought – in my own experience, if I buy say 10 off of XXX resistors with YYY value, quite often they tend to be from the same batch, so are very alike in match of value. In that case, you could get 10 off 56k carbon comp and at least two are going to be near enough twins. How close they are to 56k may be another matter but at least will be the same, if value matching is important. And as suggeted by others, there may be temp variations, but again hopefully the pair will behave the same.
If it's the case that the value must be 57.6k, then it's a long and possibly expensive search to find two carbons with that value. Or, go for high tolerance metal film.
If it's the case that the value must be 57.6k, then it's a long and possibly expensive search to find two carbons with that value. Or, go for high tolerance metal film.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
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#19 Re: 57.6KOhm Resistor 'Carbon Composite'
OR, use a potentiometer ?Mike H wrote: ↑Thu Oct 31, 2019 5:19 pm Just had a thought – in my own experience, if I buy say 10 off of XXX resistors with YYY value, quite often they tend to be from the same batch, so are very alike in match of value. In that case, you could get 10 off 56k carbon comp and at least two are going to be near enough twins. How close they are to 56k may be another matter but at least will be the same, if value matching is important. And as suggeted by others, there may be temp variations, but again hopefully the pair will behave the same.
If it's the case that the value must be 57.6k, then it's a long and possibly expensive search to find two carbons with that value. Or, go for high tolerance metal film.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#20 Re: 57.6KOhm Resistor 'Carbon Composite'
You still have the problem of measuring them to a known accuracy.OR, use a potentiometer
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#21 Re: 57.6KOhm Resistor 'Carbon Composite'
I have informed the EE/Builder of the comments received up until yesterday about the restrictions being shared about Carbon Composite Types.
The EE was keen to let me participate in the parts purchasing process, possibly resulting with extended info, that there might have been a direction to a supplier to purchase high quality ones at a more reasonable price than a used supplier.
I have been informed that there are resistors available to overcome the raised issues, and meet the required value, so I can rest assured.
These parts will be purchased from the usually used supplier, as I failed to find the value to be used on Texas Components and have not come back with any other suppliers to be investigated.
This is my first foray into such a activity, as a result I have picked up some very good pointers that I have not had to consider before.
Lets see what I am given a free reign to search out next.
The EE was keen to let me participate in the parts purchasing process, possibly resulting with extended info, that there might have been a direction to a supplier to purchase high quality ones at a more reasonable price than a used supplier.
I have been informed that there are resistors available to overcome the raised issues, and meet the required value, so I can rest assured.
These parts will be purchased from the usually used supplier, as I failed to find the value to be used on Texas Components and have not come back with any other suppliers to be investigated.
This is my first foray into such a activity, as a result I have picked up some very good pointers that I have not had to consider before.
Lets see what I am given a free reign to search out next.
- andrew Ivimey
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#22 Re: 57.6KOhm Resistor 'Carbon Composite'
Don't you think this is all a bit silly....
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
- pre65
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#23 Re: 57.6KOhm Resistor 'Carbon Composite'
Perhaps,perhaps,perhaps.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- andrew Ivimey
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#24 Re: 57.6KOhm Resistor 'Carbon Composite'
Now there's a babe!
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
#25 Re: 57.6KOhm Resistor 'Carbon Composite'
Trust me, I am a doctor...I have been informed that there are resistors available to overcome the raised issues, and meet the required value, so I can rest assured.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#26 Re: 57.6KOhm Resistor 'Carbon Composite'
In my view, The request for Copper Cap's went down really well, the request for Resistors have taken on a different route.
I assume there are loyal followers of certain
types.
I assume there are loyal followers of certain
types.
- pre65
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#27 Re: 57.6KOhm Resistor 'Carbon Composite'
It may (possibly) be that you are asking for something that is non existent in reality, as in the original request.
That, together with the "secrecy" of the intended use, has (I suspect) elicited a degree of wee wee taking.
That, together with the "secrecy" of the intended use, has (I suspect) elicited a degree of wee wee taking.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
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#28 Re: 57.6KOhm Resistor 'Carbon Composite'
Just thinking aloud.
John has not specified the type of fixing this resistor should have. I was assuming "through hole" but it could be SMD ?
If through hole could one use an SMD by soldering on wire ends ?
And would thick film SMD resistors have the "qualities" that carbon composition have ?
If my thoughts are total bollox I apologise.
John has not specified the type of fixing this resistor should have. I was assuming "through hole" but it could be SMD ?
If through hole could one use an SMD by soldering on wire ends ?
And would thick film SMD resistors have the "qualities" that carbon composition have ?
If my thoughts are total bollox I apologise.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#29 Re: 57.6KOhm Resistor 'Carbon Composite'
That's because the two questions were very different.In my view, The request for Copper Cap's went down really well, the request for Resistors have taken on a different route.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- IslandPink
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#30 Re: 57.6KOhm Resistor 'Carbon Composite'
Good point, I have tried than and would say 'yes' they have the key properties of non-inductive carbon when used in the signal path. You have to buy the biggest ones they make, if you want to have any chance of soldering them to anything !
"Once you find out ... the Circumstances ; then you can go out"