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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
24db low pass filter calibration question.
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Europanaut



Joined: Apr 04, 2014
Posts: 46
Location: Nanaimo, BC, Canada

PostPosted: Tue Oct 28, 2014 3:18 pm    Post subject: 24db low pass filter calibration question. Reply with quote  Mark this post and the followings unread

The calibration procedure for this filter suggests starting with 100hz at 0 volts. I have two filters, and one only goes down to 120hz, and the other goes to 130hz, despite messing around with the trim pot.

I'm curious to know if this is incorrect for the lowest range of self oscillation. If not, are there resistor values that can be messed with to extend the range down further?

Or does it really matter?


Thanks
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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Tue Oct 28, 2014 8:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

For calibration it doesn't really matter. 100Hz just makes the doubling relationship easier to see.

I don't know the filter well enough to comment on whether that's within the normal range of this particular circuit.
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