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I think it will be better if you share more on what information is available with you - so that others can help you faster.
One option is - if you are able to scope out the voltage @ diode in secondary or the current through the diode - all before the capacitor in secondary, you can measure the switching frequency.
i don'k know the inductance because i don'k hav any measuring inst lik LCR, function generator...
py turns: 170 ts, 0.1mm wire
sy turns: 11 ts, 0.3mm wire
auxiliary turns: 11 ts, 0.1mm wire
transistor s 13001
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