I want to produce a high voltage from a 9 volt dc power source to make ion wind, someone said modeulate the dc current, what does this mean and how can I do it?
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One simple option you could try is to change it to a pulsating DC with a double-pole relay wired to vibrate. That will give a frequency of about 30 breaks per second. Then you can use that to drive an ignition coil. You might be able to use a 12v relay, but I don’t know how well it work with a 9v battery. This should give you at least a 5,000 -10,000 volts. That’s a bit low for high voltage experiments, but probably just enough to generate a corona wind (or "ion wind").
I’ve done corona wind experiments with a 15,000 volt neon transformer. Those just run directly from AC. The corona wind was strong enough to blow out a candle. I probably would have had even better results if I rectified the transformer output with a high voltage diode.
I wouldn’t bother to try, for the first part of this, second, the effort is not going to work anyway because of the DC to DC inverters that you’ll need to use. A 9 volt power source, even if it could supply 1000 amps is not going to do much of anything to produce ions. You need to understand that ionization requires high voltage. 9 volts just is not high voltage for much of anything in ionization. The inverters operate by taking your 9 volts, converting it to a high frequency signal, passing that through a transformer, rectifying it, and most likely using a diode/capacitor voltage multiplier to produce the desired high voltage. Modulating your 9 volts just is not going to get through the inverter.
Once you have sufficient ionization happening, the changes created in the air stream by the ionization of the air will tend to create a naturally occurring movement anyway. How much of a movement is going to depend on the amount of ionization produced. That will depend on how many ionization needles are being employed, the voltage used, and the available current from the high voltage generators. If you are looking for a breeze that can be easily felt, I think you need to forget it, unless you have several hundreds of thousands of dollars to invest, as well as appropriate government approval. The level of ionization needed to create a sustainable, and readily felt ion wind is going to take a lot of energy and that, is going to be quite dangerous. The voltage, and current needed to obtain what you might be after will be large enough to jump from where they are supposed to be, to you, or anyone, or anything else and would tend to do damage, or to kill. I’d advise a lot of caution.
What they were talking about is you would have to change the DC the battery puts out to at least square wave AC to be able to use a transformer to increase the voltage. The device is called a inverter. 12 volt inverters are used in cars/trucks to provide 120 volts AC but not a very good sine wave.
If you are thinking about putting this system on the "Toy" that is on the net that lifts off the table using ion wind I hate to say it but it will NEVER work because of the weight of the power supply, the device just barely lifts itself with a external power supply.