Monthly Archives: March 2006

New Toys

Posted on March 31, 2006 by Administrator

Our toy room has new items: New set of step drills. On the right- older two, on the left- newcomers. Chain saw- there will be less trees in our yard. Electric jigsaw- for our new designs. Pressure washer- maybe I’ll … Continue reading →

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HDD failure

Posted on March 28, 2006 by Administrator

This web page and lots of other small web pages are powered from recycled computers. The hardware is very old… Yesterday, very old Seagate SCSI disk drive failed… This was very sad news, as the backup of the disk is … Continue reading →

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Winding the transformer

Posted on March 23, 2006 by Administrator

PWM transformer are wounded like ordinary transformers. But there are some important differences. As the working frequency of the transformer are much higher than ordinary line transformer, the windings contains much less turns. Also, skin effect is introduced. Also there … Continue reading →

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Bones

Posted on March 15, 2006 by Administrator

I forgot a bit “instruction of safe animal handling” and one small animal pressed me and my hand to the wall… My little Bad horse who pressed my hand. And my hand turned to other side a bit. I even … Continue reading →

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Transformer for PSU

Posted on March 8, 2006 by Administrator

Ferrite core transformers are used in high frequency power supply. The main core parameters are core material and area of core cross-section. Area can be calculated using regular geometric formulas. The problem is to determine core material- they all look … Continue reading →

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High power PSU (2)

Posted on March 6, 2006 by Administrator

The main component of PSU is TOPSwitch-GX chip. There are produced whole line of these chips: TOP242 (weakest), TOP243, TOP244, TOP245 (used in this design), TOP246, TOP247, TOP248, TOP249 and TOP250 (Most powerful- 10A switch, up to 290W output power). … Continue reading →

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High power PSU

Posted on March 5, 2006 by Administrator

This is simple, quite powerful and economical power supply. You don’t need to switch it off- when load is off, the psu draws on fraction of Wat of the power. (80 mW @ 110 VAC, 160 mW @ 230 VAC). … Continue reading →

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