Album Electronics stuff from .:madworm:.

Dumpster Diving

nobody@ipernity.com (.:madworm:.) — Wed, 31 Oct 2018 18:13:10 +0000

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Vintage electronics

nobody@ipernity.com (.:madworm:.) — Tue, 30 Oct 2018 19:41:47 +0000

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Hamamatsu photomultiplier tube

nobody@ipernity.com (.:madworm:.) — Sat, 18 Nov 2017 13:41:19 +0000

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Blown 440mA HRC fuse

nobody@ipernity.com (.:madworm:.) — Sat, 18 Nov 2017 13:41:17 +0000

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Old Q-Switch controller

nobody@ipernity.com (.:madworm:.) — Sat, 18 Nov 2017 13:41:14 +0000

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Bunch of Wire

nobody@ipernity.com (.:madworm:.) — Tue, 11 Aug 2015 10:39:01 +0000

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Soldering for masochists

nobody@ipernity.com (.:madworm:.) — Sat, 27 Jun 2015 20:26:02 +0000

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oshpark.com/shared_projects/OY7ejfs1

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.

EEVBlog Rulerz

nobody@ipernity.com (.:madworm:.) — Mon, 11 Nov 2013 15:50:20 +0000

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www.eevblog.com

Power supply - load test

nobody@ipernity.com (.:madworm:.) — Fri, 17 May 2013 12:04:20 +0000

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Testing the power supply that came with my LED strip.

Made with gnuplot.

"Toner transfer"

nobody@ipernity.com (.:madworm:.) — Mon, 11 Feb 2013 22:53:04 +0000

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It doesn't work as I expect it with copper-clad boards, but rather nicely on my desk... DOH!

Elecfreaks - OSHW box

nobody@ipernity.com (.:madworm:.) — Fri, 09 Nov 2012 16:51:56 +0000

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Quite nice, but not much of the printed stuff survived. The whole box was wrapped in sticky tape.

KIS-3R33S output ripple voltage

nobody@ipernity.com (.:madworm:.) — Fri, 01 Jun 2012 21:40:03 +0000

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230mA output current. Very far from the rated 3A.

I think I need to get or build some sort of dummy load to test this thing further. Big fat transistor, big fat heatsink, current sense resistor + opamp as constant current source. Mabe some 4mm banana binding posts to use my DMM as current meter.

KIS-3R33S output ripple voltage

nobody@ipernity.com (.:madworm:.) — Fri, 01 Jun 2012 21:40:02 +0000

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230mA output current

Once I have a working dummy load, I can test if these modules really withstand the advertised 3A continuous and 4A peak current.

KIS-3R33S inductor voltage drop

nobody@ipernity.com (.:madworm:.) — Fri, 01 Jun 2012 21:40:02 +0000

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CH1: inductor input, CH2: inductor output, MATH: CH1-CH2

Note that the "math scale" does NOT compensate for probe attenuation.

Higher output voltage mod #2

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 23:34:38 +0000

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Removed the two 51k upper resistors of the feedback voltage divider. Now it can be tuned with an external 200k trimmer pot wired as a simple voltage divider between the output and GND. The wiper goes to the adjust pin (blue).

Higher output voltage mod #1

nobody@ipernity.com (.:madworm:.) — Thu, 31 May 2012 23:34:37 +0000

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I removed an optional Zener diode on the output side and replaced it with a 10µF ceramic capacitor. This seems to be enough to get it stable, at least at light loads. If this is still the case at 3A is a different matter.

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 06:21:18 +0000

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Testing...