jacky March 8, 2012 1 Comment


Here is a simple variable frequency circuit based on timer NE555. Here NE55 is wired as an astable multivibrator, whose output frequency can be varied by varying a potentiometer. This circuit is a must in the work bench of a electronic hobbyist. Frequencies ranging from several Hz to several KHz can be obtained using this circuit. For very low frequencies (few Hz) replace C with a higher value electrolytic capacitor. The low frequency oscillator schematic is shown below.

Circuit diagram with Parts list.



The values of R and C can be obtained using the following equations.

1/f = 0.69 C ( R1 + 2R2).

% duty cycle = 100(R1+R2)/(R1+ 2R2) .

The good option is to select R1 in K Ohms and R2 in M Ohms.

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