# Easily Tuned Sine Wave Oscillators

Posted on Feb 6, 2014

One approach to generating sine waves is to filter a square If a lower distortion oscillator is needed the circuit in Figure wave This leaves only the sine wave fundamental as the 2 can be used Instead of driving the tuned circuit with a output Since a square wave is easily amplitude stabilized by square wave a symmetrically clipped sine wave is used clipping the sine wave output is also amplitude stabilized A.

The clipped sine wave of course has less distortion than a clipping oscillator eliminates the problems encountered with square wave and yields a low distortion output when filtered agc stabilized oscillators such as those using Wein bridges This circuit is not as tolerant of component values as the Additionally since there is no slow agc loop the oscillator one shown in Figure 1 To insure oscillation it is necessary starts quickly and reaches final amplitude within a few cy- that sufficient signal is applied to the zeners for clipping to cles occur Clipping about 20% of the sine wave is usually a good value The level of clipping must be high enough to C1 e C2 Frequency Adjust Amplitude Adjust 1 F0 j 2 q C 1 0R 3 R 1 TL H 8466 1 FIGURE 1 Easily Tuned Sine Wave Oscillator The circuit in Figure 1 will provide both a sine and square insure oscillation over the entire tuning range If the clipping wave output for frequencies from below 20 Hz to above 20 is too small it is possible for the circuit to cease oscillation kHz The frequency of oscillation is easily tuned by varying a due to tuning component aging or temperature changes single resistor This is a considerable advantage over Wein Higher clipping levels increase distortion As with the circuit bridge circuits where two elements must be tuned simulta- in Figure 1 this circuit is self-starting neously to change frequency Also the output amplitude is Table I shows the...

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