The NE566 used in this circuit and a PLL from Philips Components. The period T of the generated ramp depends on the capacitor Ci and is calculated by the formula:
Where:
fo and the frequency of operation in hertz
T and the period in seconds
Vcc and the supply voltage in volts
Vo is the polarization voltage on pin 5 of the integrated
Ct is the value of the capacitor used in farads
RT is the total resistance between pin 6 of the integrated and
Vcc in ohms.
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