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Old 25th April 2003, 12:52 AM   #21
Philo is offline Philo  United States
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Winding a toroidal transformer without the right equipment is very difficult from what some of the experienced members in here have said. I wouldn't do it myself. Iv'e made a couple of bobbin inductors but thats a different story.
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Old 25th April 2003, 12:58 AM   #22
elizard is offline elizard  Canada
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yeah, i'd imagine a torroid would be harder to wind .. but a normal EI core shouldn't be THAT tough .. i could be wrong though ..

in any case .. i thank you philo for all the help .. amazing help i get from you
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Old 25th April 2003, 01:03 AM   #23
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Phil,

To tell the truth, I am in somewhat of a unique situation, and one that only occurred to me a few days ago. My flat is only a half mile away from two of the most powerful radio/tv transmitters in the UK, at Crystal Palace.

I too had problems that were solved, ( more through luck than judgement), with earth buzz with the LMs, that don't seem to be a problem with the OPAs, but I have a real problem with RF, so much so that I have now given up on the reduced gainclone, and am trying to limit RF effects as much as possible, and this seems to be a problem especially with the fast CF chips I am playing with with the CFMSS chip amp I am building at present. So I am not sure my findings are relevent to other's situations.

Ho hum
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Old 25th April 2003, 01:39 AM   #24
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The toroids I'm using are potted inside, so it's not easy to do some extra windings. I had to break the potted stuff, but I was doing it in order to convert it to 18-0-18 V AC. Otherwise you might have to drill small hole for you LED windings It will work as well. As long as wire is enameled you can wrap it one over the other. The size is about 2.75 by lslightly less than 5" in diameter.
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Old 25th April 2003, 01:45 AM   #25
elizard is offline elizard  Canada
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aw man, i didn't even realize that .. how hard would it be drill maybe a 2-3mm hole in the potting compound? and what sort of problems could that create? (like is the potting compound solid or powder?)

ps. i just went to radioshack and bought the hookup wire i need as well as the magnet wire .. i think i'll start constructing the ps cables tonight

as well i gotta finish my speaker cables too!!!

oh and (too many questions) how close to the actual windings would i have to drill the hole? could i just drill it in the middle of the potting compound???

oh AND .. what sort of voltage should i expect for 6 windings?
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Old 25th April 2003, 01:53 AM   #26
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There is actually a hole in the middle of the potting compond for the mounting screw. I would rather drill another one, but it has to be done carefully so you won't damage the existing windings
The compaound is hard, but easy to drill, it's like 2 parts epoxy.
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Old 25th April 2003, 02:08 AM   #27
usekgb is offline usekgb  United States
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I've actually seen people wrap wire all the way around the outside of the toroid to get the desired voltage to the LED. What is the problem with doing this? No holes to drill.
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Old 25th April 2003, 02:09 AM   #28
elizard is offline elizard  Canada
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arund the outside of the torroid???
you mean like wrapping it length wise (as opposed to threading it through the hole in the "donut")?
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Old 25th April 2003, 02:15 AM   #29
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Quote:
Originally posted by usekgb
I've actually seen people wrap wire all the way around the outside of the toroid to get the desired voltage to the LED. What is the problem with doing this? No holes to drill.

You might see people wrapping the wire, but did you see the LED giving light? I never tried that, so I don't know. But I tried to wrap toroid like that with a copper band (for shielding) and it never got hot (the copper band)
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Old 25th April 2003, 03:51 AM   #30
Philo is offline Philo  United States
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Quote:
Originally posted by usekgb
I've actually seen people wrap wire all the way around the outside of the toroid to get the desired voltage to the LED. What is the problem with doing this? No holes to drill.
Well, I was little bored and had a toroidal out and hooked up so I tried both ways;
circumferential (all around the outside, perpendicular to the other windings) and diametric(from outside across the center) configurations and neither worked. I tried the normal way and was succesful.

Usekgb, can you describe the configuration you saw with a little more detail? I think the first method would not be correctly orientated to the field and the second self-canceling.
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