I tried building an induction coil

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SUMMARY

The forum discussion centers on the construction and troubleshooting of an induction coil circuit using a transistor and a 555 timer. The primary coil consists of 213 turns with an input voltage of 12.1 volts, while the secondary coil has 1,266 turns, yielding a maximum output voltage of 16.5 millivolts. Key issues include improper wiring, lack of a flyback diode, and potential damage to transistors due to excessive current. Recommendations include adjusting component values and ensuring proper schematic representation for effective troubleshooting.

PREREQUISITES
  • Understanding of induction coil principles
  • Familiarity with transistor operation and circuit design
  • Knowledge of 555 timer functionality
  • Experience with measuring voltage and current using a digital multimeter
NEXT STEPS
  • Research proper induction coil circuit design, including capacitor use for resonance
  • Learn about flyback diodes and their role in protecting transistors
  • Study the effects of wire gauge on inductance and voltage output
  • Explore troubleshooting techniques for electronic circuits
USEFUL FOR

Electronics enthusiasts, hobbyists building induction coils, and individuals troubleshooting transistor-based circuits will benefit from this discussion.

  • #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.
 
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  • #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.
 
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