EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: dog80 on September 19, 2013, 02:08:55 pm
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I have a small board mounted transformer that I desoldered from a PSU. It has a EEL-16-2005 marking and is probably the same as the one in the middle in this picture:
http://www.it.com.cn/f/diy/058/25/20050825_csdy_bmeng_10.jpg (http://www.it.com.cn/f/diy/058/25/20050825_csdy_bmeng_10.jpg)
I want to determine the pinout. I tried to find a datasheet but had no luck.
It has three pins on the one side with a single strand of wire each (guess this is the high voltage side) and there are five pins with multi strand wires on the other side.
I tried supplying 16 volts AC on the high side but it was drawing too much current.
What am I doing wrong?
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Those transformers are designed to run at high frequency (40kHz-100 kHz), they won't run properly at mains frequency (50-100Hz). It's almost useless to you, it's not the same thing as a regular, classic transformer.
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Specifically it's a Flyback transformer (http://en.wikipedia.org/wiki/Flyback_transformer)
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The two smaller transformers will be of more use. One of them should be a 1:1 isolation transformer, and another should be suitable for a single transistor forward +5V DC power supply from mains.