QWERTY

[pranav]

...

[mfratus2001]

No.
If you can't hear the frequency, it is over 10KHz. But you can make some instruments.
Frequency is in the time domain, so "spark versus time" is what you are measuring. Dragging the wire that draws a spark across metal covered with paper will leave a dotted line of holes on the paper. It may be hard to move fast enough if the frequency is very high.

[pranav]

No.
If you can't hear the frequency, it is over 10KHz. But you can make some instruments.
Frequency is in the time domain, so "spark versus time" is what you are measuring. Dragging the wire that draws a spark across metal covered with paper will leave a dotted line of holes on the paper. It may be hard to move fast enough if the frequency is very high.

No, the paper just simply burns. It is AC continous output.

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[george.b]

Why, yes, it's very simple:

• Stick the flyback output onto your tongue;
• Count how many pretty flashes you see in a second.

Actually, no, don't do that. Why don't you show us the circuit you used? That might give a better ballpark figure than "guessing".

[Zero999]

How are you driving the flyback transformer?

If it's driven from an RC oscillator such as a 555 timer, then the frequency can be easily calculated.

If it's driven using a blocking oscillator, or Mazilli driver then it's more difficult to predict, since it depends on the characteristics of the transformer and the load connected to it.

[Ian.M]

Its not particularly difficult to build a crude frequency meter.   Either use a MCU with an externally clocked counter timer, or build a frequency to voltage converter to use with a multimeter.  Calibrate over the audio range with a tone generator program and a PC soundcard, and for higher frequencies, the easiest option is to spot-check using crystal oscillator modules.

[james_s]

Or buy a frequency counter, even something like this is going to be better than guessing and it's hard to get much cheaper.

http://www.ebay.com/itm/Frequency-Counter-Meter-1Hz-50MHz-for-Crystal-Oscillator-Digital-LED-DIY-Kits-/141640365757?

Even real instruments can be had for relatively little, something like this for example.

http://www.ebay.com/itm/HEWLET-PACKARD-80MHz-FREQUENCY-COUNTER-5381A-serial-1404A00956-/302297579145?

[danadak]

Depending on frequency you could use sound card software, to either
implement a counter or look at spectrum plot.

Make sure you protect sound card input, google "sound card input protection"
to find solutions.


http://techmind.org/audio/


https://www.zeitnitz.eu/scope_en


Regards, Dana.