hello people,
there is always a discussion going on about parts, well here is my question. i have red that a tantalium resistor on my dac will sound much much better.
but i red an article, where a guy makes his own resistor from resitor wire.
he uses isotan,
http://www.isabellenhuette.de/pdf/WIDER_LEG/ISOTAN-ISABELLENHUETTE-R.pdf
(but constatan could also be used).
i want to know your opion.
1)i need to make a 5k resistor, and because i don't wanna end up winding to much, i'll take 500 omh/m wire, or even more (like 1k/m) the wire is getting very thin; for 500 ohm: 0.035mm ; 1k= 0.025mm diameter; is this a problem that the wire is getting extremely thin ?
2)what about the winding, it is non magnetic wire, but what about the mH, cause it gonna looks like a coil.
you can use other winding techniques, but is that gonna resolve all the problems?
3)what to use: higher ohm, thinner wire : so less turns; or thicker ,lower ohm wire with more turns ?
thanx
there is always a discussion going on about parts, well here is my question. i have red that a tantalium resistor on my dac will sound much much better.
but i red an article, where a guy makes his own resistor from resitor wire.
he uses isotan,
http://www.isabellenhuette.de/pdf/WIDER_LEG/ISOTAN-ISABELLENHUETTE-R.pdf
(but constatan could also be used).
i want to know your opion.
1)i need to make a 5k resistor, and because i don't wanna end up winding to much, i'll take 500 omh/m wire, or even more (like 1k/m) the wire is getting very thin; for 500 ohm: 0.035mm ; 1k= 0.025mm diameter; is this a problem that the wire is getting extremely thin ?
2)what about the winding, it is non magnetic wire, but what about the mH, cause it gonna looks like a coil.
you can use other winding techniques, but is that gonna resolve all the problems?
3)what to use: higher ohm, thinner wire : so less turns; or thicker ,lower ohm wire with more turns ?
thanx
well if you have to wind them on something, then you are actually making a coil. so there could be some inductance involved
I do this all the time. My wire of choice is Manganin because you can solder it, it's rock stable, and it doesn't generate any significant thermal emf against copper. It's what NIST uses for their working standards of resistance. Those are then checked against a quantum standard (I think), but that's too inconvenient for daily calibration use. Things like Constantan can be soldered with difficulty, and have good properties, but generate a huge thermal emf against copper by comparison. That's why they also use if for thermocouple wire. Good for power circuits and heaters, but not for low level DC circuits. There are also excellent alloys like RO-800 that have every possible good property except one- they can't be soldered, but have to be welded to a solderable lead. I know nothing about tantalum resistors, but can't imagine they'd be as good as Manganin.
There are various strategies for winding resistors with minimum inductance. The easiest is to fold the length of wire in half, making a bite (or byte or some other spelling!), then hook the loop on a thread or pin, and wind the paralleled strand together around the form. The form can be various materials, depending on ones purpose.
IMO, none of this will be as good as a good bulk metal foil resistor for low inductance or size, nor is it good for high resistance values- the wire gage gets too small and the finished size too big. I won't comment on sound, since I think all resistance materials sound the same. IMO it's only the physical configuration and dielectric materials that matter. Others disagree, usually strongly
There are various strategies for winding resistors with minimum inductance. The easiest is to fold the length of wire in half, making a bite (or byte or some other spelling!), then hook the loop on a thread or pin, and wind the paralleled strand together around the form. The form can be various materials, depending on ones purpose.
IMO, none of this will be as good as a good bulk metal foil resistor for low inductance or size, nor is it good for high resistance values- the wire gage gets too small and the finished size too big. I won't comment on sound, since I think all resistance materials sound the same. IMO it's only the physical configuration and dielectric materials that matter. Others disagree, usually strongly
aha, that is very usefull information.
how thick is your wire you use ?
and how much ohm is the highest you wire ?
i need something around 5k. is that already to much ?
and where can you get it ?
thanx a lot
how thick is your wire you use ?
and how much ohm is the highest you wire ?
i need something around 5k. is that already to much ?
and where can you get it ?
thanx a lot
It's a hopeless case to make a really good resistor, small AND with good resistive properties AND more than milliohms.
that's not what i have red,
indeed they are big, very big, and cannot have a lot of power. but soundwise, they beat everything. at least that's what i have red at a guys site, and i believe him, he's not a noob.
here you have hist site, and project
http://www.dhtrob.com/projecten/dhz_weerstand_en.htm
indeed they are big, very big, and cannot have a lot of power. but soundwise, they beat everything. at least that's what i have red at a guys site, and i believe him, he's not a noob.
here you have hist site, and project
http://www.dhtrob.com/projecten/dhz_weerstand_en.htm
IMO peranders is absolutely right, though I wind up to a few hundred ohms with excellent AC performance. For resistance standards, there's no problem up to 10K and higher. The problem is, they're huge and never have zero inductance. Now, I've seen a company offering resistors wound out of a huge length of copper wire, and the claim is they sound great. The dilemma here is that what peranders and I consider excellent specifications have to do with basic electrical parameters like stability, inductance, voltage coefficient, self resonance, aging, temperature coefficient, and thermal emf against copper ( hop right in peranders if that's not your criteria!). Once you start talking about the sound of a resistor, all hope is lost, unless you can decide what measurable parameter is attached to that sound. As for a wire source, you can try Kanthal Palm Coast. You'll have to buy a reasonable amount, and it's not cheap, but they can supply almost any alloy. As for gage, you'll have to decide on how big you want the resistor, how small a wire you can handle comfortably (I draw the line at about 40ga), then get the resistance table and work out the length. If I can get it scanned, I'll try to post some tables and winding diagrams later.
Hi,
if you were winding <=10r then I think you stand a chance, but 5k0?
The wind in one direction and reverse it, works to reduce winding inductance.
Conrad's dual wire method brings the two ends together at the PCB and this makes the inductance even lower.
if you were winding <=10r then I think you stand a chance, but 5k0?
The wind in one direction and reverse it, works to reduce winding inductance.
Conrad's dual wire method brings the two ends together at the PCB and this makes the inductance even lower.
Very high precision wire-wound resistors can be bought here:
http://www.rhopointcomponents.com/p...ESISTORS&subcategory=Precision+(through+hole)
No need to bother making them DIY!
http://www.rhopointcomponents.com/p...ESISTORS&subcategory=Precision+(through+hole)
No need to bother making them DIY!
I have a big box of vintage precision wirewound resistors holed up somewhere. If I can find them and there is a 500R your welcome to have it/them. If I remember correctly thought they are all much higher values.
The nice thing about making them DIY is that once you have a few spools of resistance wire, you can have any value you want, matched to any degree you desire, and for any power level you care to design for. Not to mention the satisfaction of having done it yourself. Haven't ventured into DIY teflon capacitors yet, nor is my semiconductor fab up and running. Maybe next week.
QSerraTico_Tico said:
Even more so when you look around and find sources of 0.1% accurate low ppm resistors for peanuts.
You can read many things on the net but you must also evaluate the content in such texts. Did you plan to use the resistors in a regular amp?then_dude said:
Any attempt to make the resistor more compact is a compromise in performance. You can minimize the inductance by folding the wire in half then twisting it. However, if you then wrap the twisted wire around a form, you're adding inductance again. You need to drill a hole in your cabinet and bring the twisted wire out straight - perpendicular to the gold-plated, teflon PCB, and suspend the end from the ceiling using a piece of teflon dental floss. Any other method will result in inferior sound.
I_F
I_F
Not only do efforts to reduce the size compromise performance, but at any given size there's also a tradeoff between inductance and capacitance. Here , here and here are three pages from an old Terman book with some useful text and diagrams of various ways to wind resistors. Also, the resistivity of Manganin is 290 ohms per circular mil foot. A Google search will get you the math to convert that to how much of what size wire you need for whatever resistor you want to wind. IMO, this technique is best suited to low values!
- Status
- Not open for further replies.