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digital low pass filter circuit design/realization
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Engineering & Manufacturing > Electrical

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The client has made the following changes to the job.


Job awarded.

Sep 1, 2011

Job Description

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  • Posted: Sun, Aug 14, 2011
  • Time Left: Closed
  • Location: Anywhere
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  • Start: Immediately
  • Budget: $500 - $1,000
  • Fixed Price Job
  • Elance Escrow Protection
  • U.S. freelancers must have W9
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entrepreneur looking for at least a pro audio circuit and potentially a circuit designer to work with longer term if said circuit is successful.

design a pro audio circuit with two low pass filters of differing cut-off frequency ranges (specifically, one filter's cut-off must not be able to pass 1 kHz 10% and the other must not pass 3 kHz 10 %, but both should be able to reach down into the low hundreds of Hz) in parallel. very much like a wah pedal circuit e.g. those discussed at a geofex dot com article describing "The Technology of Wah Pedals" but digital. must be able to take line level (i.e. instrument) input, be able to output the same and be powered via 9V battery or AC adapter without interfering with other audio effects in proper series. must have user-adjustable cut-off frequency (in the case of analog versions that's usually made possible by an adjustable potentiometer.)

most important metric: must be able to roughly match template spectrogram provided here as at...

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Job ID: 25677794
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