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 ![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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
Thanks!
ps. opamps are TLO72