Hum In This Parametric Mid EQ! New
« on: April 17, 2015, 09:13:38 AM »
Hi All,
I constructed this circuit on a copper strip board according to the  schematic diagram shown. However, there is a constant hum. Someone suggested that the circuit is drawn wrongly & the pin 1 of R11 should not be be connected to signal ground, but to pin 7 ie; o/p of IC1B instead as shown in red lines! I thought I'd ask for some expert opinion before I do this!

Can any one of you guys please help me with your expertise?

« Last Edit: April 17, 2015, 09:29:07 AM by Analogheart »