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 clean my car.
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 not created. So all stuff in /home directory was almost lost. When drive was removed […]
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 is some effect with magnetic flux. The simplified description is that the flux tends to […]
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 heard some crackle noise, but it was from the wall, as x-ray told the bones are ok. […]
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 dark gray… But we can assume, that manufacturer used most common and cheapest core. So […]
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).
The chip is connected in typical way according to manufacturer’s recommendation. Eagle schematics is a […]
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). The main component is TOP242-250 chip.
Special transformer is used in this supply.
Schematics for printing and […]
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