hatandm Posted October 17, 2006 Report Share Posted October 17, 2006 Does anyone know how to make a voltage controlled filter? I am making a guitar effect called the auto-wah which in theory uses an envelope follower to supply the voltage to a VCF [(Voltage Controlled Filter) bandpass/lowpass/highpass filter]. The filter will change it's cutoff frequency or Q due to the change in voltage from the envelope follower which in turn gets it's voltage from the guitar signal. Every guitar note will give a different sound, seeing as the envelope of every note is different. The only piece I need to finish this thing is how to control the filter with a voltage. Any ideas? Thanks in advance! Quote Link to comment Share on other sites More sharing options...
MP Posted October 18, 2006 Report Share Posted October 18, 2006 Yes. There are several ways to do this. Voltage control has to be built in as part of the circuit. It is rarely an add-on. In the most basic type of this design, you can use the bandpass section of a state variable filter and use a voltage variable resistance instead of a pot. Can you post the circuit that you are currently using? Voltage Controlled filters can be made in a very wide variety of types. The auto-wah is also known as an envelope filter.MP Quote Link to comment Share on other sites More sharing options...
hatandm Posted October 23, 2006 Author Report Share Posted October 23, 2006 I actually already discovered basically what you said above. Thank you for the response though! Quote Link to comment Share on other sites More sharing options...
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