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Anyone help me to calculate the frequency of LM324 circuit

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lick_man

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lm324 circuit

This circuit here:
324pwm_c.gif


On pin 1 there is a square wave
on pin 10 there is a sawtooth wave
they are the same frequency. But I can't calculate.
I need a help.
 

lm324n wave generator

thanks IanP
but could you tell me how to have this fomula?
by expression.
Thanks so much
 

lm324

IanP

May I know what is the function of this circuit. I have used LM324 in my circuits before but never came across this circuit configuration.

Thanks you in advance.
 

lm324 pwm circuits

U1A + U1B --> triangle wave generator ..
Output of U1C (comparator) is PWM (pulse width modulated) wave; in this case it is speed controller of a fan ..

Regards,
IanP
 

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