Accurate Sine Wave Generator Circuit PCB

Posted on Feb 5, 2014

Many electronic devices depend upon the shape of the signals. It is very simple to produce square wave signals from sine signal, but doing vice versa is quite difficult. In case of static square wave-to-sine wave converter circuit diagram, in low frequency range, we can generate accurate sine wave, but in high frequency range the shape will not be

Accurate Sine Wave Generator Circuit PCB
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a true sine wave. Here is a solution to that problem as the wave does not tend to have distortion. The circuit shown here uses five ICs. The squarewave signal is fed at pin 1 of IC1 (CD 4024). IC1 is a 7-bit counter, but here only 6 bits are made use of. The first four bits are fed as a signal bus to IC3 (CD4066) quad bilateral switch through IC2 (CD4077B) that contains four exclusive NOR gates. It converts the 4-bit signal bus to up mode` and down mode` hexadecimal signals, simultaneously. The converted signal bus switches on and off the ladder switches inside CD4066. As a result, the net resistance of ladder varies. This varying resistance varies the charging and discharging current of capacitor C1 in thefeedback path of IC5 (LM741). The charging and discharging mode is controlled by IC4 (CD4011). In fact, capacitor C1 works as an integrator. The sinewave producing circuit needs 64- bit squarewave pulse for 360o sine wave. A missing pulse in this 64-bit sequence produces ramp. In this circuit, all ICs except IC5 are CMOS ICs and hence the current consumption is very low. The value of capacitor C1 may be calculated from the relationship: C1 = 0. 27/f0 µF. The value shown in the circuit is for 50Hz output frequency. The shape of the sinewave output may be corrected using presets VR1 and VR2.

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