jurasz.de

Jarek Jurasz

My robotic lawnmower (Landroid M1000) stopped to work, complaining it is out of its work area. I knew the wire had some weak spots, but where? It is a few years old, several hundred meters long, hidden under grass... An interesting challenge.

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There is a cool group on Facebook called "Electronics Theory and Circuit Design". People have interesting ideas, the group has good spirit and culture.

But I had this not-so-nice discussion with a new member called Doug Hale. He proudly presented XY scope photos with a circles on a rectangular ras...

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For a couple weeks now I have this Hantek 2D42 handheld oscilloscope, multimeter and generator and it is time to start a review.

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Today I need a ± 100V symmetric power supply for a few mA of current consumption. I have this power supply from my broken audio amplifier, which can deliver ± 40V or ± 50V DC peak, depending on the 4/8 Ω switch for the transformator taps. Can I double the voltage somehow?

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Have I Been Pwned?

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My wife and me got impressed by an article in German c't "Der Hacker-Hunter" about Troy Hunt and his efforts. Afterwards I wrote a simple Ruby script to check against his database of leaked accounts and passwords, https://haveibeenpwned.com. Currently there are about 550 millions records of 2.2...

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