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177CommentsThird rock from the sun, 0 deg W, 51.5 deg N approx.Joined March 17th, 2007
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  • Build Your Own Variable Lab Bench Power Supply

    Please be very careful. That looks like an open switch-mode power supply. In an open switch-mode power supply, Dangerous mains voltages will be accessible and if you touch the wrong place you could receive a fatal electric shock. Please be very careful. I think you'd be much safer using an enclosed power supply as suggested in the instructable. The very-same voltages are present, but should stay safely enclosed within the casing.

    Use a solder sucker and or desolder braid. It's probably best to reflow the solder pads with lead-solder first as the lead-free type can present problems.

    I rather suspect that you may need a fan for the version with the small heatsinks, especially if you're dissipating more power. I found at least three variants, there may be more.

    "Why do you need a current adjustment?" Because some loads will draw more current than is good for them. LEDs are an example.Also as was mentioned in the video, if one makes a mistake, a fault current could flow, destroying a component. Restricting the current helps limit the damage.

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  • Build Your Own Variable Lab Bench Power Supply

    Linear, because the trimpots will be linear.

    Why do you need a current adjustment ?Because a number of types of loads (a load is anything that you might want to power from this), rely upon a current limit. Example: LEDsLeds need a current limit otherwise the current will rise to a level at which they will be destroyed.

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