I tried building an induction coil

Click For Summary

Discussion Overview

The discussion revolves around the construction and performance of an induction coil, specifically focusing on the input and output voltages, circuit design, and potential issues with components. Participants explore various factors affecting the voltage output, including coil design, component specifications, and circuit connections.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant reports building an induction coil with specific input and output voltages, detailing the number of turns in the primary and secondary coils.
  • Questions are raised about the effects of using a wider core and eliminating gaps between turns on the secondary coil's voltage output.
  • Another participant requests a circuit diagram and clarification on whether AC or DC is used for measuring output voltage.
  • Participants discuss the need for detailed information about the circuit components to provide effective assistance.
  • Concerns are expressed about the potential damage to transistors due to the absence of a flyback diode and the observed voltage drop at the collector pin.
  • Suggestions are made to adjust component values, including the capacitor and resistors, to improve circuit performance and prevent overheating.
  • One participant mentions a popping sound and a significant drop in lithium-ion cell voltage, raising questions about possible damage to the battery.

Areas of Agreement / Disagreement

Participants express differing opinions on the impact of specific design choices on the output voltage and the necessity of certain components, such as the flyback diode. The discussion remains unresolved regarding the optimal design for achieving higher output voltage and the implications of observed circuit behavior.

Contextual Notes

Participants note the importance of accurate schematics and detailed specifications for effective troubleshooting. There are mentions of potential short circuits and component failures, but no consensus on the best approach to rectify the issues presented.

  • #31
David lopez said:
i taped wires to the 18650 lithium ion cells, connecting 4 lithium ion cells in series. the 6 ohm resistor was connected to 4 18650 lithium ion cells in series.
It's still not obvious what you are doing here but it looks as if your short circuit current was Four times the 600mA I suggested, which means a 2.4A drain on your cells to start with. This may mean you have exceeded the 1C discharge rate (depending).

Taking the cells our of the box means that there is none of the protection that you get within the battery .

That suggests your contact may not be good and that you now have a high resistance contact with your wires. Did you try Solder?

Do you seriously have a problem supplying PF with a decent schematic diagram? If you are trying to self-educate then IT is a topic that you could benefit from.
 
Engineering news on Phys.org
  • #32
Drawing.jpeg


is this a proper schematic . i was alternately disconnecting and connecting wires.
 
  • #33
David lopez said:
is this a proper schematic
Much better thanks.
Did you ever look at designs for induction coil circuits? They include a Capacitor to increase the Primary pulse voltage due to resonance. You put the C across the opening contact gap.
 
  • #34
i tried looking for websites that explain how to design a induction coils. could you show me a schematic of an induction coil circuit.
 
  • #35
David lopez said:
i tried looking for websites that explain how to design a induction coils. could you show me a schematic of an induction coil circuit.
Another thing that could help your iT skills would be more practice with search engines. Asking PF is not the best way forward. Search with the terms in your last post and you should get somewhere. PF is not a spoon feeding service and I think this point has been made to you already.
 
  • Like
Likes   Reactions: russ_watters

Similar threads

Replies
7
Views
8K
Replies
2
Views
2K
Replies
64
Views
8K
  • · Replies 11 ·
Replies
11
Views
4K
  • · Replies 56 ·
2
Replies
56
Views
6K
  • · Replies 25 ·
Replies
25
Views
6K
  • · Replies 17 ·
Replies
17
Views
3K
Replies
12
Views
2K
  • · Replies 10 ·
Replies
10
Views
6K
  • · Replies 9 ·
Replies
9
Views
3K