Have any of you experience in using wire wrap wire to make toroid transformers? Such as trifilar for balanced mixers?
bob-N7SUR
13819
2017-04-19 12:50:39
David J Nushardt
Re: Wire Wrap Wire for Toroid Transformers
Hi Bob, I tried it once ,but didn't like the results , unraveling easily, difficult to get a tight wrap but It will work , I seen it used in the midnightdesignsolutions SNA crystal test fixture on T37- 43's. Good luck! Dave
13820
2017-04-20 01:57:44
Johan Bodin
Re: Wire Wrap Wire for Toroid Transformers
Yes, unless you need thicker wire to handle power or to mitigate loss good old wire wrap wire is great for this purpose. For bi- tri- quadro- or n-filar windings, just stretch n, preferrably differently colo(u)red wires, tie one end of the bundle to some steady anchor point (I often use a door handle ;-) ) and put the other end in the chuck of a hand-help drilling machine. While keeping the wire bundle slightly stretched, run the drill to achieve the number of "twists per inch" that you want.
> > > Have any of you experience in using wire wrap wire to make toroid > transformers? Such as trifilar for balanced mixers? > > bob-N7SUR
13821
2017-04-20 08:17:11
in3otd
Re: Wire Wrap Wire for Toroid Transformers
Hello, it will work but if you need a very wide bandwidth transmission line transformer it may not be the best solution; the impedance you will get from a bifilar line made with wire wrap wire will usually be higher than when using magnet wire. This may or may not be an issue, depending on your application. For example, here you can see the measured response of a 1:1 inverting transmission line transformer, http://www.qsl.net/in3otd/ham_radio/160m_transformers/BN-73-202_inv_S21_comp.png made with different kind of wires. The high frequency response is worse when using wire wrap - at low frequency it makes no difference. See http://www.qsl.net/in3otd/ham_radio/160m_transformers/160m_trafos.html for more details on the measured transformers.
73 de Claudio, IN3OTD
13822
2017-04-20 09:17:37
David J Nushardt
Re: Wire Wrap Wire for Toroid Transformers
Bob I am told bi and trifilar wire is available, however it depends how prolific a builder/experimenter you are, it's expensive and you have to buy several hundred ft. Usually a club can purchase some and share the coast between members if there is enough interest.
It's usually not practical to buy for the occasional project, wire wrap wire is one solution , I was able to buy several different shades of 28 ga. Magnet wire to make my own trifilar wire , just buy from several different mfg's.
I also got some from a friend who belongs to a large club.
Good luck!
Dave
13823
2017-04-20 15:37:07
Claudio Girardi
Re: Wire Wrap Wire for Toroid Transformers
Hello, it will work but if you need a very wide bandwidth transmission line transformer it may not be the best solution; the impedance you will get from a bifilar line made with wire wrap wire will usually be higher than when using magnet wire. This may or may not be an issue, depending on your application. For example, here you can see the measured response of a 1:1 inverting transmission line transformer, http://www.qsl.net/in3otd/ham_radio/160m_transformers/BN-73-202_inv_S21_comp.png made with different kind of wires. The high frequency response is worse when using wire wrap - at low frequency it makes no difference. See http://www.qsl.net/in3otd/ham_radio/160m_transformers/160m_trafos.html for more details on the measured transformers.
73 de Claudio, IN3OTD
----Messaggio originale---- Da: "bobledoux@proaxis.com [emrfd]" Data: 19-apr-2017 8.56 PM A: Ogg: [emrfd] Wire Wrap Wire for Toroid Transformers
Have any of you experience in using wire wrap wire to make toroid transformers? Such as trifilar for balanced mixers?