|High impedance balance output circuit|
All balanced phase dealt with until now have their input impedance is determined by value input resistors, etc., and this can not be raised without lowering the noise performance.
High impedance balance output circuit diagrams above shows one answer to this. Input op-amp itself is quite a lot has infi nite
Impedance in terms of audio, so the input impedance is determined by the need to R1, R2 bias non-inverting input. A property of remarkable and very useful from this circuit is that the addition of Rg resistance increased profits, but maintain the balance of the circuit. This confidentiality guration can not be set to weaken for the advantages of an op-amp with feedback on the series can not decreases below unity.