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.
For a couple weeks now I have this Hantek 2D42 handheld oscilloscope, multimeter and generator and it is time to start a review.
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?
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?
When I get a spontaneous idea to drive some screws into something, the chances are that both of my cordless screwdrivers are dead very quickly. The battery in my old 14.4V 1.2Ah screwdriver has no capacity any more. My new 19.2V Aldi-screwdriver would be like 5% full. That's why I tried to drive them with a power supply.