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1000_1_TUNING_VOLTAGE_VOLTAGE_CONTROLLED_FILTER

2017-02-13 12:30  
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1000_1_TUNING_VOLTAGE_VOLTAGE_CONTROLLED_FILTER
A standard dual integrator ftlter can be constructed using a few CA3080s. By varying IABC, the reso-nant frequency can be swept over a 1000:1 range. At IC1, three are current-controlled integrators. At IC2, four are voltage followers that serve to buffer the high-impedance outputs of the integrators. A third CA3080 (IC5) is used to control the Q factor of the filter. The resonant frequency of the ftlter is linearly proportional to IABC. Hence, this unit is very useful in producing electronic music. Two outputs are pro-duced: a low-pass and a bandpass response.