Power Routing Switch

Started by Rick C in sci.electronics.basics2 years ago 1 reply

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...

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 sealed lead acid battery for= backup when the power fails. =20 This design uses pairs of pFETs to route the power from the 12 volts input = when present, or the battery when the line is not p...


EV Stocks On Fire

Started by Bret Cahill in sci.electronics.basics2 years ago

https://www.barrons.com/articles/tesla-xpeng-other-ev-stocks-are-on-fire-this-is-why-51605901707

https://www.barrons.com/articles/tesla-xpeng-other-ev-stocks-are-on-fire-this-is-why-51605901707


Amateur alarm circuit problem

Started by RobH in sci.electronics.basics2 years ago 24 replies

I built an alarm circuit from a book I bought called Make Electronics by Charles...

I built an alarm circuit from a book I bought called Make Electronics by Charles Platt. https://drive.google.com/file/d/1NxvKdZCqykuSjBvPVoWz_MEMhKYMMz9E/view?usp=sharing The said circuit produces a siren type sound on a buzzer so I added an led through a resistor, a 10k pot and a LDR. I then connected the centre pin of the 10k pot to pin 2 on the top IC555 shown on the schematic ...


PCB Motor: 97% Efficiency and 12 kW/ kg Power

Started by Bret Cahill in sci.electronics.basics2 years ago

Also easy to retool the plant for different size...

Also easy to retool the plant for different size motors. https://insideevs.com/news/453557/infinitum-electric-pcb-motor-first-automotive-application/


Power supply trips CU

Started by RobH in sci.electronics.basics2 years ago 15 replies

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...

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. https://uk.rs-online.com/web/p/embedded-switch-mode-power-supplies-smps/8139099/?sra=pstk I connected it up to a 3 pin plug with a 13A fuse. When I plugged it in to an extension socket, which had a 13amp fuse, to check the output voltage, it tripped ...


Through Board Desoldering High Melting Point Solder

Started by Bret Cahill in sci.electronics.basics2 years ago 6 replies

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...

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. Bret Cahill


E field impedance

Started by Tom Del Rosso in sci.electronics.basics2 years ago 10 replies

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...

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 you get farther from the source. Is there a somewhat intuitive way to look at that? On another matter, I've asked before about the disagreement between some books with diagrams of E and M i...


Experiment to show that current leads voltage by 90 degrees in capacitor (Using RC circuit and Oscilloscope)

Started by Anonymous in sci.electronics.basics2 years ago 9 replies

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...

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 experiment in youtube: https://www.youtube.com/watch?v=wjQsyLv0X7A


MCU reset during relay switches ON

Started by Niresh in sci.electronics.basics2 years ago 7 replies

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...

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 100nF near VDD of MCU and 1uF across RESET pin. Regards, NiK


"Technology Is Directional" <=> "Low Hanging Fruit Everywhere"

Started by Bret Cahill in sci.electronics.basics2 years ago 4 replies

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...

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 set of impossible things i= s > > than the set of the possible so you save an infinite amount of time ju= st by being aware of the impossible. You definitely need the basics to imp= rove your


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