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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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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Elektrozähler auslesen

Ich wollte unseren Stromverbrauch transparent machen, also habe ich gegen schlappe 100€ einen elektronischen Stromzähler von SYNA einbauen lassen. Es ist ein Iskra ("Funke") MT175 mit einer Infrarot-Schnittstelle. Jetzt geht es darum, den Zähler an unseren FHEM Server anzuschließen.

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The LED lightbulbs should use less power (sure) and work for years (not quite). At least 20.000 hours - that would be almost 10 years at 6 hours a day. But I see many of those die after a month or two. They flicker or seem completely dead. Why? What can be done?

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