Photos, videos and docs of .:madworm:., with the keywords: "buck"

Buck regulator - current

nobody@ipernity.com (.:madworm:.) — Wed, 20 May 2015 17:27:01 +0000

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KIS-3R33S breakout

nobody@ipernity.com (.:madworm:.) — Wed, 20 May 2015 17:26:01 +0000

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Buck regulator - switching noise

nobody@ipernity.com (.:madworm:.) — Wed, 20 May 2015 17:26:01 +0000

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Vertical scale: 20mV/div - 10x probe.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:18 +0000

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Testing...

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:17 +0000

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Be careful when removing the legs.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:17 +0000

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Got rid of most of the silicone rubber.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:16 +0000

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Popped the cap

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:15 +0000

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Finished KIS-3R33S board

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:19 +0000

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Current consumption in power-down mode is about 60µA.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:15 +0000

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KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:18 +0000

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Modified to output 4.5V instead of the standard 3.3V. The most useful "manual" for this device is currently this one. Maybe I will add a blog post about it, which may be around for longer.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:16 +0000

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Silly-cone thermal compound. Not terribly hard to remove, but it is annoying.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:17 +0000

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All legs gone

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:17 +0000

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KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:15 +0000

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Missing legs

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:15 +0000

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These step-down modules are currently available on ebay for about 40¢ per piece (pack of 20). Input voltage 5V-23V output a bit lower. 3A continuous current, 4A peak. They DO require an additional output capacitor to run stably.

KIS-3R33S

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 06:21:15 +0000

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Step-down converter

nobody@ipernity.com (.:madworm:.) — Tue, 29 May 2012 11:04:35 +0000

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It is pretty efficient. Drop out voltage is about 0.5V at light loads. Only the trimmer is a bit strange. It's really unwilling to turn without force. Maybe I'll replace it some day.

Reflow mishap?

nobody@ipernity.com (.:madworm:.) — Tue, 29 May 2012 11:04:35 +0000

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I tried to re-melt the solder, but that didn't help. I will have to get a hot-air thingy some day.

One through hole part

nobody@ipernity.com (.:madworm:.) — Tue, 29 May 2012 11:04:35 +0000

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If it weren't for this through hole trimmer, the board would be much nicer.