Tim the enchanter

Opamp Labs 109 EQ question
« on: October 18, 2009, 11:23:37 AM »
Hi. Longtime lurker, first time poster.  Looking to build a couple of 109s, but I'm wondering if there may be a few mistakes on the published schematic.
It's at the top of this thread...

http://www.groupdiy.com/index.php?topic=24292.msg288759#msg288759

My question concerns the high & low shelving.  When switched to shelving (caps out of the circuit), it appears that the 50 & 100 Hz settings are using the exact same RL values.  Same thing with the 300 & 400 Hz settings.  Similarly, on the high end (with the inductors switched out), the 7 & 10 KHz settings are using the exact same RC values, as are the 12.5 & 15 KHz settings.

Am I missing something here?

Thanks,
Tim


 

Related Topics

  Subject / Started by Replies Last post
6 Replies
5110 Views
Last post September 22, 2010, 06:34:47 PM
by elektroivo
0 Replies
276 Views
Last post February 03, 2020, 02:23:13 PM
by Stevo
8 Replies
1054 Views
Last post May 05, 2020, 11:49:19 AM
by rackmonkey
45 Replies
2586 Views
Last post January 10, 2021, 06:04:29 PM
by craigmorris74