Building Faraday Flashlight Help

  • Thread starter Thread starter psionicarrow
  • Start date Start date
  • Tags Tags
    Building Faraday
Click For Summary

Homework Help Overview

The discussion revolves around building a Faraday flashlight, focusing on issues related to charging a capacitor and generating voltage using a magnet and coils. The subject area includes electrical circuits and energy conversion.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to charge a capacitor in a circuit with a DC motor and LED but encounters issues with the capacitor not charging. They question whether the capacitor size is a factor. Another participant requests a schematic to better understand the circuit setup.

Discussion Status

The discussion is ongoing, with participants exploring the original poster's circuit design and seeking clarification through schematic requests. There is no consensus yet on the underlying issues or solutions.

Contextual Notes

The original poster mentions specific component values, such as a 12V DC motor and a 16V 2200µF capacitor, and raises concerns about the capacitor's size affecting functionality. There is also a reference to using a magnet and coils with a wave bridge rectifier, indicating a potential exploration of electromagnetic principles.

psionicarrow
Messages
2
Reaction score
0

Homework Statement


I need to build a faraday flashlight and I have two problems.

Homework Equations


(1) When I use a 12V DC motor connected in parallel to a capacitor (16V 2200uf) and then to an LED assembly, I can't get the capacitor to charge. (2) If I wanted to use a magnet and coils connected to a wave bridge rectifier and then to a capacitor and LED, how would I calculate the amount of Voltage produces by moving the magnet?

The Attempt at a Solution


I've already built a flashlight with the DC motor, it is able to turn on the LED but the capacitor just does not charge. I've put in a switch between the capacitor and LED and all I can get it to do is light up when I'm turning the motor and the switch is on; when the switch is off I turn the motor but when I flip the switch on the LED doesn't light up. Could the problem be that my capacitor is too large?
 
Physics news on Phys.org
Can you post a schematic of your circuit?
 
circuit.jpg
 
I think you can see this http://www.lightflashlights.com/ . It's very well. And I think that it's very useful.
 
Last edited by a moderator:

Similar threads

Making a handcranked flashlight with a supercapcitor
  • · Replies 7 ·
Replies
7
Views
3K
Is it possible to implement this circuit operation?
  • · Replies 4 ·
Replies
4
Views
1K
Powering an LED via Induced Current
  • · Replies 10 ·
Replies
10
Views
4K
Changing capacitance effect on ripple in full rectification circuit
  • · Replies 4 ·
Replies
4
Views
3K
High School Why does my LC circuit not oscillate its energy between Electric & Magnetic fields?
  • · Replies 152 ·
6
Replies
152
Views
8K
12V DC Motor in Light Fixture with Dimmer & 12V DC to 110V AC Inverter
  • · Replies 21 ·
Replies
21
Views
3K
Eddy currents in Faraday's Law Experiment
  • · Replies 3 ·
Replies
3
Views
2K
Why do the headlights on the car become dim when the car is starting?
  • · Replies 4 ·
Replies
4
Views
2K
Can a reed switch use a wheatstone bridge/potential divider?
  • · Replies 1 ·
Replies
1
Views
2K
How to wire an emergency flashlight?
  • · Replies 9 ·
Replies
9
Views
2K