Design flaw, the first stage resistors connected to Vsig of the Sub-Bass, L-Mid, U-Mid, Presence and Brilliance filter have a topology that make that appear in parallel with each other when the resistance is measured between Vsig and ground. As a result this significantly lowers the resistance measured by those resistors as shown in the following diagram.
This means that the spectrum filters are not isolated from each other and will affect each other's signal responses
****************To prevent this problem, I am going to use the fourth op-amp in each IC package as a buffer amplifier for each spectrum filter
The first stage resistors of the Bass and midrange filter connect to Vsig and a capacitor as shown in the following diagram. Therefore the measured resistance was unaffected as shown in the following image
Ghani Lawal
Discussions
Become a Hackaday.io Member
Create an account to leave a comment. Already have an account? Log In.