Passive EQ from Opamp Labs circuit

craigmorris74 · Jan 27, 2008

I was building an Opamp Labs 109eq like in the top schematic below. I could never get the amp section to perform properly, so I'm thinking about just unsing the EQ section in a passive configuration. I hacked up the origian schematic and posted it below. Does this look like it will work? If anyone sees anything blatantly wrong, let me know.
Thanks,
Craig

solder_city · Jan 27, 2008

nope.

craigmorris74 · Jan 27, 2008

nope.

uh, little help then maybe?

okgb · Jan 27, 2008

Somehow i think you'll have to create an opamp circuit , maybe
with opamps and wire in a simular way
It looks a bit like the circuit Scott Dorsey had in Recording mag a while back .
or the was Forssel designed the SST-1 eq [ see it in the block diagram ]

shabtek · Jan 27, 2008

what okgb said you need an opamp w inverting and non inverting inputs, look at forssels eq pointers or api eq schematic

craigmorris74 · Jan 27, 2008

Before reading your replies I put rewired the low end to resemble my schematic , and taking the output from there, it works. Would the problem lie in adding the mid and high sections?

Passive EQ from Opamp Labs circuit

Help Support GroupDIY Audio Forum:

craigmorris74

Well-known member

solder_city

Well-known member

craigmorris74

Well-known member

okgb

Well-known member

shabtek

Well-known member

craigmorris74

Well-known member

Similar threads

Latest posts

Passive EQ from Opamp Labs circuit

Help Support GroupDIY Audio Forum:

craigmorris74

Well-known member

solder_city

Well-known member

craigmorris74

Well-known member

okgb

Well-known member

shabtek

Well-known member

craigmorris74

Well-known member

Similar threads

Latest posts

Join the conversation!

Join today and get all the highlights of this community direct to your inbox. It's FREE!