Anyone have some winding instructions or tips for toroidal transformers? I want to get 55V DC out of one for a 100W mono board.
Theory of how to wind toroid transformers.
Size and material of core
Wire dimensions
Number of primary turns
Number of secondary turns
Fixation of the windings
Aside from getting it all right,
I do not think you have much money to gain from wind your own trafos.
How come you think of doing it, instead of buying?
Size and material of core
Wire dimensions
Number of primary turns
Number of secondary turns
Fixation of the windings
Aside from getting it all right,
I do not think you have much money to gain from wind your own trafos.
How come you think of doing it, instead of buying?
Why?
Well... I guess I love a challenge, and I'm a little hardheaded. I guess I'm thinking DIY all the way? LOL I s it really that difficult?
Well... I guess I love a challenge, and I'm a little hardheaded. I guess I'm thinking DIY all the way? LOL I s it really that difficult?
Hi,
start with a pre-wound primary. It should be tested as well.
DIY allows you extra windings exactly matching your requirements.
If a standard pair are good enough then then buy ready made even secondhand, eBay is a good source.
360VA will allow about 180 to 260 Watts of amplifier output. Translated into two channels this equates to 90W+90W upto 130W+130W of continuous power.
There are a number of sites giving winding info and some previous threads here on DIYaudio.
start with a pre-wound primary. It should be tested as well.
DIY allows you extra windings exactly matching your requirements.
If a standard pair are good enough then then buy ready made even secondhand, eBay is a good source.
360VA will allow about 180 to 260 Watts of amplifier output. Translated into two channels this equates to 90W+90W upto 130W+130W of continuous power.
There are a number of sites giving winding info and some previous threads here on DIYaudio.
Try:
www.toroid.com. There is a bit of theory on the Kits page. Notice the "Kits" page. They give you what you need, except for magnet wire.
I am looking to build an integrated amp, and the custom aspect of winding your own is appealing for that.
Also, I did find a site that had all the calcs you need for transformer design...I'll look for it again...
www.toroid.com. There is a bit of theory on the Kits page. Notice the "Kits" page. They give you what you need, except for magnet wire.
I am looking to build an integrated amp, and the custom aspect of winding your own is appealing for that.
Also, I did find a site that had all the calcs you need for transformer design...I'll look for it again...
Good deal.
Hey Croat..
That calculator site address would probably help me a lot. Thanx for looking... I already ordered a "kit" last week of toroid.coms 80VA kit just so I could teach myself how to wind them!
Hey Croat..
That calculator site address would probably help me a lot. Thanx for looking... I already ordered a "kit" last week of toroid.coms 80VA kit just so I could teach myself how to wind them!
200VA
How about the 200VA per side. How many watts, amps, and volts would that give me for one channel?
How about the 200VA per side. How many watts, amps, and volts would that give me for one channel?
Hi,
as a rule of thumb, divide the VA by 1.5 to give the maximum power output. 200VA > about 130W.
Decide on the minimum load impedance you want this power to drive. Vpk=sqr rt(P*R*2). Add on some Vrail to Voutput loss, say 6Volts, giving a Vrail = +-(Vpk+6).
Vac = Vrail/1.414
For an 8ohm load then Vac=36Vac to 37Vac.
The unloaded Vrail will be about 8% higher than loaded Vrail and at peak mains incoming voltage you should allow about +6% again or a higher figure if you know the tolerance from your supply company.
This max peak value determines the working voltage of your smoothing caps (63Vdc).
as a rule of thumb, divide the VA by 1.5 to give the maximum power output. 200VA > about 130W.
Decide on the minimum load impedance you want this power to drive. Vpk=sqr rt(P*R*2). Add on some Vrail to Voutput loss, say 6Volts, giving a Vrail = +-(Vpk+6).
Vac = Vrail/1.414
For an 8ohm load then Vac=36Vac to 37Vac.
The unloaded Vrail will be about 8% higher than loaded Vrail and at peak mains incoming voltage you should allow about +6% again or a higher figure if you know the tolerance from your supply company.
This max peak value determines the working voltage of your smoothing caps (63Vdc).
Links to Calcs...
Here are some I found that may be useful.
I was thinking of this one as it shows calcs based on what type of filtering, rectification, and transformer you are using.
http://www.atc-frost.com/products/design/va.htm
Step by Step:
http://www.geofex.com/Article_Folders/xformer_des/xformer.htm
Here are some I found that may be useful.
I was thinking of this one as it shows calcs based on what type of filtering, rectification, and transformer you are using.
http://www.atc-frost.com/products/design/va.htm
Step by Step:
http://www.geofex.com/Article_Folders/xformer_des/xformer.htm
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