Low frequency signal generator(2Hz，4Hz，60Hz,120Hz)

Published:2011/7/29 2:26:00 Author:Ecco | Keyword: Low frequency, signal generator, 2Hz, 4Hz, 60Hz, 120Hz | From:SeekIC

Low frequency signal generator can be used to measure the sensitivity of amplifier, frequency response, frequency compensation, tone control, it is very useful measuring instruments to repair low-frequency amplifier. It is also used as a digital clock source. Depending on the actual use, the signal generator outputs eight fixed frequencies, selecting switch arbitrarily, the voltage output range can be adjusted in two blocks of 0 ~ 0.1V, 0 ~ 1V. The working principle is shown as the chart. IC CD4060 is a fourteen divider with an oscillator. The crystal SJT produces a 30720Hz weak signal frequency, and it forms a crystal oscillator with Cl and the internal of CD4060 inverter. Rl is used to provide feedback loop, it can only produce oscillation on the fundamental frequency of crystal, the oscillation center frequency is 30720Hz. The tuning capacitor Cl makes the frequency tune at the center frequency. SA is placed at pin 3 of CD4060. 30720Hz is divided by CD4060 nine stage(512 times), the pin 13 outputs high accuracy 60Hz output frequency, the capacitor C3 coupled it to the pin 2 of 741 op-amp for signal amplification, then outputed form pin 6 of 741.



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