Facebook
Google
GitHub
Linkedin
Hello!
The amp uses OPA2134 as standard opamp. With some opamps the offset is too high, especially with 10x gain. AD797BR has 1.5v (!) dc offset with volume knob all the way turned up. And with no gain lower.
Is there some resistors i can change, so i can run both 2134 and ad797 stable?
I have tested to add cap over 4.7k R and 47R. Cap in series with 2.2k R and 680R to ground. And cap over V- and V+. Offset is the same.
Schematic i attached is almost same as mine just some minor changes. Bypass caps on input and and power input to opamp are 0.01uf instead. All resistors around the opamp are the same.
Thanks
The amp uses OPA2134 as standard opamp. With some opamps the offset is too high, especially with 10x gain. AD797BR has 1.5v (!) dc offset with volume knob all the way turned up. And with no gain lower.
Is there some resistors i can change, so i can run both 2134 and ad797 stable?
I have tested to add cap over 4.7k R and 47R. Cap in series with 2.2k R and 680R to ground. And cap over V- and V+. Offset is the same.
Schematic i attached is almost same as mine just some minor changes. Bypass caps on input and and power input to opamp are 0.01uf instead. All resistors around the opamp are the same.
Thanks
