All Questions
0
votes
1answer
11 views
Voltage regulator help
I need help with what is probably a very simple question that I don't know.
When you put 12v at 10 watts and bring it down to 5v with a regulator would the wattage change?
And just say the regulator ...
0
votes
1answer
12 views
Power opamp 'floating' output
So I had to design an amplifier with a 'floating' output. (I don't know if floating is the right word, it's the direct translation from dutch.)
See the picture below ( I drew it whilst sitting in the ...
0
votes
1answer
25 views
What happens when supplying an LED with too low voltage?
What happens when supplying an LED with too low voltage? Will it just emit less light? I'm making an octocopter, and need to cut away as much weight as possible. I need to run the LED without cooling ...
-2
votes
1answer
15 views
Repairing a tablet charger
As such suddenly my tablet charger isn't working properly (i.e) unable to charge the device...
I with the hope of repairing it opened its outer plastic cover...
It was a 5V ,2A charger....
I ...
1
vote
1answer
25 views
Minimum electrical resistivity of contact material for human protection from lightning
The context of the question is camping and sleeping outdoors in the unprotected elements. If you’re sleeping in a tent close to the ground, and lightning directly strikes your tent or the vicinity ...
1
vote
5answers
46 views
How to cheaply switch between two sets of 7-input-wires?
I am trying to make a water level sensor.
I want to use a single circuit for two water tanks. For this I need to be able to switch between two sets of 7-wire-inputs to the circuit (the 7 wires that ...
-2
votes
0answers
25 views
Maximum current of wheelchair motor [on hold]
I have a 24V 10 A 138rpm wheelchair motor of fracmo. What will be the maximum starting current of the motor and which driving circuit i should use?
0
votes
0answers
18 views
How do I match a brushless motor to an ESC?
I have purchased an iPower GBM5208H-180T brushless DC motor.
Configuration: 12N14P
Resistance: 10.2 ohms
I need to run the motor at ~1800 RPM.
Here's iPower's list of ESCs. Most are rated ...
0
votes
0answers
24 views
Problems with simple RLC Series circuit
I've just started learning about RLC circuits, and using a few different resources has confused me greatly. Here is the circuit in question - http://imgur.com/DvzzCxq. There are three seperate ...
0
votes
1answer
41 views
How do you find the equivalent voltage of the current source in this circuit?
The circuit is shown at this schematic.
How do I find the equivalent voltage of the current source by simplifying the circuit?
-5
votes
1answer
33 views
What's the basic difference between ARM, AVR and 8051 microcontroller? [on hold]
I've been trying to do a project using Arduino, I need your help to know the basic differences between these. Thank you
1
vote
1answer
18 views
Line out bias on sound card output
I recently bought an USB sound card to do some measurements/experiments with. What I want to do first is to build a simple amplifier for the headphone output.
Therefore I took the sound card apart ...
-1
votes
0answers
28 views
PCB manufacturing companies references [on hold]
i'm looking for a PCB manufacturing company I'm working with HDI design with 10-12 layers, with uVIA, you have any recomendation of a company (ASIA,US,EU,anyware...) that you have good experience with ...
-1
votes
0answers
36 views
What are dangling nets in schematics?
I have come across couple of references in PCB designing documents where I don't understand what the dangling nets refer to. Help plz?
0
votes
0answers
32 views
Updating TFT Graphics Display each frame [on hold]
I have an LCD with il9230 controller, I'm using the parallel interface 16bits to control the registers and to write pixels.
I'm trying to rotate a triangle that I have drawn, but I need to refresh ...
