RC type scanning signal generator circuit composed of the FET tube

Published:2011/8/14 20:13:00 Author:TaoXi | Keyword: RC type, scanning signal, generator, FET tube | From:SeekIC

The RC type scanning signal generator circuit which is composed of the FET tube is as shown in the figure. This circuit is the Wien bridge RC oscillation circuit, and it is composed of the oscillation amplifier and the positive and negative feedback circuit. The oscillation frequency is decided by the RC value of the positive feedback circuit, now we suppose C=O.001μF to calculate the resistance of resistor R to see whether it meet the requirements. The scanning circuit is composed of the constant current source, the constant current charging capacitor and the scanning discharging circuit, the VT10 constant current source charges the capacitors C3 - C5, when the charging voltage of the capacitor gets to a certain value, it will be compared by the comparator through the A2.



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