# How does this circuit output 25kHz?

This circuit doesn't use a gate drive, so I am trying to understand how it can output 25kHz. A friend of mine told me that it does so with the use of LC resonance; the capacitor and inductor next to F1 and F2 achieve resonance as per the formula $$f = \frac{1}{2\pi \sqrt{LC}}$$ but I still have my doubts...

• Have you tried to simulate it? – winny Sep 23 '18 at 18:35
• not yet. PSIM isn't working at my college PCs at the moment. – DigiNin Gravy Sep 23 '18 at 18:39
• You can use the built in tool right here on EE.SE if you edit your question and press the schematics symbol. Installing LTspice is also an option. – winny Sep 23 '18 at 19:03