operating frquency of an unknown smps?

[ambi]

hii all, can anyone tell how to find the operating frequency of an unknown flyback transformer?

 

[ravi1488]

You need to find out its turns ratio, inductance of primary and Secondary and wire gauages...

 

[ravindragudi]

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.

 

[ambi]

hiii thanks for ur response

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

pl help me ot

thanks

 

[ravi1488]

First tell me, do you have that transformer only OR you have a whole circuit of SMPS ?

 

[ambi]

Whole circuit of smps...