500Hz signal generator circuit

Published:2011/8/6 8:17:00 Author:nelly | Keyword: signal generator | From:SeekIC

2. Working principle is as shown in the picture. The 500Hz oscillator is composed of VTl, T, VDl, resistor, capacitors and so on. The oscillator frequency is decided by the parallel resonant frequency of C3 and L1-3. Resistor Rl is used to improve the input impedance of the transistor VTl, so the influence to the oscillator also can be reduced. R2, R3 are the DC bias resistors. R4 and R5 are the VTl emitter resistors, and R4 has the current negative feedback function. In order to adapt the change of supply voltage, the voltage of two ends should be regulated. Under normal circumstances, the output level of L4-5 is 0dB±2.6dB／600Ω, and the oscillation frequency is 500Hz.



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