Three waveform signal generator

Published:2011/4/22 1:40:00 Author:Ecco | Keyword: Three waveform, signal generator | From:SeekIC

TCL8038 is a dedicated function generator circuit with a variety of waveform output function (square wave, triangle wave, sine wave). The operating current is about l0mA with positive and negative power. the circuit is shown as the chart. C5 ~ C8 use the capacitors with small temperature coefficient and the capacitance error. Sl can output 1Hz pulse when the block being C8. RP2 uses 51 ~ 100kΩ double connection potentiometer to facilitate the frequency scale. RPl, RP3 are used to fine-tune the output waveform and make the upper and lower peaks along the smooth. Sl is the frequency of coarse block, RP2 is fine-tune frequency potentiometer. When debugging, the frequency scale calibration could be made with the aid of a digital frequency meter. And the waveform is measured by oscilloscope, adjusted by the potentiometer RPl and RP3. RPl makes the duty cycle of square wave modulation be 50% , adjusting RP3 could make the sine wave signal tend to be more smooth. The frequency of the signal generator is decided by the formula 0.3/RAv · (C5 ~ C8) and its frequency range is 1Hz ~ 1MHz.



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