Simple High Voltage Flyback inverter [without feedback coil]

Step 3 The secondary coil

Finding the secondary coil isn't so hard. (wire up a test circuit like on the picture)

- Take a 5-25V power supply (safe voltage) or a 9V battery (the polarity doesn't really matter).
- Connect the + from the V-meter to the positive HV output (thick wire at the top).
- Connect the - from the V-meter to the negative side of your power supply.
- Touch every pin on the flyback transformer.
- when you found a signal, equal to the voltage of your supply, that's the 0V pin from your secondary coil!

Comments

[geckomage]

actually i did a different set-up. i hooked the positive end of the volt meter to the hv. out. the low end of the volt meter to the low end of the power supply, and then used the positive end of the power supply to test around and find it. i found this on another page and it was described there to usually lower the voltage. but generally the secondary coil has a huge amount of resistance (hence why you must use a voltage and power to find it) because otherwise you would need a fancy volt meter to find it. but this resistance goes down when voltage is increased, and the frequency is increased. and most driver circuits run these at 15-25khz ish (correct me if im wrong) and since both the voltage and frequency is increased it lowers the resistance of the secondary coil while in operation. :)

[geckomage]

I do not know if anyone had anything similar occur but with this same setup i applied 24 volts to it (as i found on a different instructable) and only got about 12 volts on the HV 0v pin. but none of the other pins showed any voltage. hope this helps someone!

[Electorials]

do you mean with the same setup as in the picture here?
It's weird to get only half the voltage.. Really weird actually!
It would mean that the resistance of the coil would be as large as the internal resistance of your volt-meter, which is several mega ohms.
and that would mean your coil is no coil but an insulator.

Could you explain more in detail what you did there?