The circuit shown in the figure is a triangle wave generating circuit that can adjust the amplitude to an accuracy of about ± 0.01V. If a DC voltage is applied to the V REF and V-REF terminals, the amplitude of the triangular wave is the peak value of V REF and V-REF, respectively.
This circuit combines an integrator and two comparators that determine positive and negative peaks. If the output of the comparator on the positive peak side is positive, D1 locks itself, and the inverted output through the comparator on the negative peak side is negative. If you change R1 to a potentiometer, you can change the frequency and keep the amplitude unchanged. If you want to change the symmetry of the waveform, you can connect a 50kΩ potentiometer to the positive and negative power supplies, and the sliding contact to the inverting end of the LM119. If a sine wave is to be generated, an accurate triangular wave is added to the non-linear circuit for sine wave synthesis. To reduce distortion, fine-tuning the amplitude is required. The oscillation frequency of the circuit is:
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According to the frequency requirements, meet the requirements by selecting R1, C1 and V REF, V-REF. If V REF = 2.5V, V-REF = -2.5V, R1 = 1k, C1 = 0.1μF, then fo = 5kHz can be calculated. The maximum operating frequency of this circuit is 200kHz.
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