On Mon, Apr 11, 2022 at 08:22 PM, Mic Scharf wrote:
But this is not balanced or am I missing something?
Can we go further with this one?
This is only a quick 'concept' schematic....
As we have discussed in this thread already, the decision to use a single sided audio output does not affect the option of creating a balanced output.?
The 'cold' side ( normally pin 3 , but in this case pin 2 because the summing amp inverts the signal) is taken to ground - via a matching output resistor and electrolytic capacitor - to create an impedance balanced output, which should help maintain a reasonable CMRR.
As to taking it further - that would be down to whether anyone thinks it might be a good ide? ..... As I say, it's only a 'concept' sketch for discussion at present.
One thing that springs to mind. Double sided capsules - particularly 'budget' Chinese ones are notorious for having slightly different output levels from each side.
In this configuration it should be possible to correct that by adjusting the value of R3? - and possibly R6 as well? - to adjust the gain to match the output signal from the two sides of the capsule.
Could help to improve the figure of 8 pattern, for example?
As I say, just a suggestion for discussion at the moment...
