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Old 27th December 2004, 01:19 PM   #181
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Default Re: TL494 smps.

Quote:
Originally posted by gearheaddruid

I made one amp using two ETD59 cores for power supply. I wound the primary with copper foil insulated by teflon sheet. The secondary was heavy litz wire taken from an old ultrasonic cleaner supply. The amp ended up with 900 watts RMS per channel into 4 ohms. I have learned a lot the hard way! Litz wire is the only way to go, it gets rid of the "skin effect" and makes the supply more efficient. I recently bought out a transformer winding company's inventory and have a lot of litz wire in my warehouse. I will be offering it for sale as soon as I get it all cataloged.
Steve -- how did you strip the litz wire?
jack
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Old 27th December 2004, 03:08 PM   #182
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Default Litz wire explained.

Thanks for the response all! Litz wire was designed to get around what is called the "skin effect" of wire. At higher frequencies the electrons only travel on the surface of the wire. This greatly reduces the effective current carrying ability of a solid wire. One way to avoid this loss is to use copper foil for windings. Not easy for us average joes to work with.
Litz wire is just a lot of verry small wire braided together to make a large conductor. This gives a lot of skin area within the conductor. The wire I used was enameled insulation. To remove the enamel for soldering on the ends you can use a chemical stripper or just heat it up with a solder gun to burn the enamel off. I then used a good flux with solder and made a terminated end.
You can find litz in old d.c. to d.c. converters, some p.c. supplies, ultrasonic cleaners, and a lot of old industrial power supplies.
Hope this clarifies the idea. Regards, Steve
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Old 27th December 2004, 03:20 PM   #183
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I use a "creme brulee" torch to strip #16 enamelled wire, have used Zip-Strip but I don't always have it around.
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Old 27th December 2004, 03:29 PM   #184
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Default Re:

Quote:
Originally posted by gearheaddruid
The wire I used was enameled insulation. To remove the enamel for soldering on the ends you can use a chemical stripper [/B]

Hi gearheaddruid,
can you suggest me any chemical for removing the enamel of copper wire
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Old 30th December 2004, 05:55 AM   #185
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Thumbs up Stripping Litz wire.

There is a product called Strip-EX sold through electronic parts stores. It is kind of messy and needs a lot of ventilation. I prefer just using a hot soldering gun or small torch to burn the enamel. scrape off the burnt stuff, a little flux and solder will give you a nice termination. Regards, Steve
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Old 5th January 2005, 02:18 PM   #186
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Default Not identify this chemical

Hey,
I have a chemical for removing insulation of copper wire but i can not identify that so i cant putdown the name of it and this is not harmfull. I have tryout that and also so chip price about 200.00 indian rupees about 4.00 US$ per litre
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Old 12th January 2005, 03:28 PM   #187
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Default help

Hi, I want to build a dual +-22Volts/min200Watts, can anyone tell me what modifications sould I make at the first scheme posted by the thread starter? (the one with+-30Volts)
Thanks in advance.
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Old 12th January 2005, 03:29 PM   #188
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Default I forgot

And I'll need also some information about the coils and transformer.
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Old 1st October 2005, 08:13 PM   #189
luka is offline luka  Slovenia
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this is my SMPS and AMP from risto80
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Old 1st October 2005, 08:13 PM   #190
luka is offline luka  Slovenia
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