SMF for DIYStompboxes.com!
Started by frequencycentral, December 25, 2008, 04:12:06 PM
Quote from: slacker on May 09, 2009, 11:01:26 AMI think you need rail to rail opamps for that envelope follower to work. The second stage has the + input referenced to ground and "normal" opamps often only work to within a few volts of the rails.
Quote from: frequencycentral on May 09, 2009, 10:49:37 AMI think I might have found the bug in this design. I just breadboarded the envelope follower for another circuit I'm working on. I used a 4558 for the two opamps that make up the envelope generator - and it didn't work. As soon as I changed to an LM324 for those two opamps it worked. Is that it? I hope so. Strange, I would have thought it would work the same with 4558s.
Quote from: frequencycentral on May 09, 2009, 01:09:47 PMThanks Ian, so what would have to change (and how) in that envelope follower to make it work with a 4558?
Quote from: orangetones on May 14, 2009, 02:23:52 PMMy suggestion would be to go back and read through this entire thread. If I am correct there was much discussion about the functionality of this project.
Quote from: svstee on February 19, 2010, 05:32:22 PMAnything new with version 2? Should I wait for it or build V1?
Quote from: Altitude on February 28, 2010, 05:25:52 PMGreetings all. I've been lurking around here looking for a worthy filter for a expanded 8 bit sampler I am working on and this thing sounds like exactly what I am looking for.. In lieu of the issues with the envelope follower could it just be dropped and the filter run wide open permanently? For my needs, that would be fine. Frequency Central, you mentioned that someone else got this working with a different env design, can you elaborate?
Quote from: Altitude on February 28, 2010, 05:31:45 PMGotcha, thanks.So just tie pin 1 and 16 and it will be "open"?
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