Logarithmic-sweep-vco

  
This circuit uses the output of the IGL8049 to control the frequency of the IGL3038 waveform generator; the 741 op amp is used to linearize the voltage-frequency response. The input voltage to the 8049 can be, for example, from the horizontal sweep signal of an oscilloscope; the output of the 8038 will then sweep logarithmically across the audio range. By feeding this to the equipment being measured and detecting the output, a standard frequency response can be obtained.
Logarithmic-sweep-vco - schematic

If the output is fed through an IGL8048 before being displayed, a standard bode plot results.




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