Scanning Oscillating Circuit Composed of TL082

Published:2011/9/4 7:30:00 Author:Joyce | Keyword: Scanning, Oscillating | From:SeekIC

This is a scanning oscillating circuit composed of TL082, which can get voltage proportional to the control voltage Uc. If adding an antilog circuit when scanning logarithms, it can be used as an automatical scanner of sawtooth wave input and voltage-controlled oscillator of low frequency sine output. The circuit is composed of Wien bridge oscillating circuit and variable resistances (photo resistances within optical couplers PC1 ~ PC3) etc. Wien bridge circuit has a resistance capacitance network with frequency selectivity. The gain of A1 is about 3,and that of the loop is 1.Its oscillation frequency f is: f = 1 / (2πR0C0), in which C0 = C1 = C2, R0 = R1 + RG1 = R2 + RG2.



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