Could anybody point out what this type bandpass filter is called so I could search more information ? ( see Audiox studer 169eq schematics found from here http://www.groupdiy.com/index.php?topic=36522.0 )
All started as I got Tascam m15b console over a year ago. Some of the eq bands tend to oscillate as I turn frequency knob ( scratchy pot, losing contact? ), or sometimes with full boost. It makes really loud squeeck type sound which I would very much like to get rid of.
Now the Studer EQ is only one schematics I found which looks to be similar topology, but it has frequency pot connected different way as Tascam and also has some additional components (such as feedback capacitor . I'd like to understand why my eq oscillates, and is there some way to eliminate that oscillation for good. I know some may think "Tascam is no good, get rid of it!", but then I (and you!) wouldn't learn anything new
Thanks!
ps. opamps are TLO72
All started as I got Tascam m15b console over a year ago. Some of the eq bands tend to oscillate as I turn frequency knob ( scratchy pot, losing contact? ), or sometimes with full boost. It makes really loud squeeck type sound which I would very much like to get rid of.
Now the Studer EQ is only one schematics I found which looks to be similar topology, but it has frequency pot connected different way as Tascam and also has some additional components (such as feedback capacitor . I'd like to understand why my eq oscillates, and is there some way to eliminate that oscillation for good. I know some may think "Tascam is no good, get rid of it!", but then I (and you!) wouldn't learn anything new
Thanks!
ps. opamps are TLO72