Latest threads in Hobby Electronics Basicsshow only best voted threads
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Remote On Switch for Devices
I don't want to have to be there to turn on the cam. Instead it needs to be turned on by a relay. If necessary I will invade the flip flop on off switch but I'm pretty sure they have figgered out a...
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3 years ago
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Rope Light Circuit
The sealed-up-in-plastic power supply comes with the plug, 110v U.S. or 220 v EU. On a 110 v AC U. S. plug the output appears to be 110 v DC and 220 AC on a volt meter. The LED part of the rope light...
4
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3 years ago
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4 | |
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Power Routing Switch
Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr onics running on lower voltages. It is powered from an external PSU like a laptop supply, but 12 volts. There is also a...
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3 years ago
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EV Stocks On Fire
hares of electric-vehicle companies are up an average of 30%—this week. A mix of trading-related and fundamental factors are responsible.
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3 years ago
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Amateur alarm circuit problem
I built an alarm circuit from a book I bought called Make Electronics by Charles Platt. The said circuit produces a siren type sound on a buzzer so I added an led through a resistor, a 10k pot and a...
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3 years ago
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PCB Motor: 97% Efficiency and 12 kW/ kg Power
Also easy to retool the plant for different size motors.
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3 years ago
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Power supply trips CU
I bought a 12volt 8.5amp TDK Lambda power supply from Radio Spares to replace a Mean Well 12v 8.5a supply which had failed after 3 years. I connected it up to a 3 pin plug with a 13A fuse. When I...
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3 years ago
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15 | |
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Non-thermal microwave injuries
When the first reports of diplomats at the American Havana Embassy falling ill were caused by microwave injuries it seemd quite implausible. Now it seems more incidents have emerged, and the Frey...
3
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3 years ago
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E field impedance
As the story goes, the E field starts with high impedance and it goes down until it's equal to the H field impedance in the far field. It's just so counter-intuitive that impedance would go down as...
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3 years ago
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Through Board Desoldering High Melting Point Solder
The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other components only 13 mm away? This is asking for a torch....
6
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3 years ago
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6 | |
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MCU reset during relay switches ON
Hi, Could any please suggest how to avoid MCU reset with voltage glitches/noise during relay switches ON. I have protected the relay coil with free wheeling diode and MCU with 2x10uF parallel with...
7
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3 years ago
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"Technology Is Directional" <=> "Low Hanging Fruit Everywhere"
It's easy for a lazy thinker -- that's everyone in some respect -- to get d istracted from the possible by studying thermodynamics which focuses on the impossible. Obviously the "cardinality" of the...
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3 years ago
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Experiment to show that current leads voltage by 90 degrees in capacitor (Using RC circuit and Oscilloscope)
Many books told me that current leads voltage by 90 degrees in capacitor. So, I designed an experiment to show that it is true. You can do the experiment at home or in the laboratory. Here is my...
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3 years ago
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Who knows GPS antennas?
I have been looking online but there seems to be, for a lot of the antennas, an assumption of prior knowledge. That I don't have. What I want to do is survey some of my property line. Mainly so I know...
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3 years ago
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Solid state relay questions
My water comes from a well. When the well was drilled I had only built my shop and so the well is now powered by my shop. The pressure tank and switch is also at the shop. Now that the house is built...
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3 years ago
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