Integrated quadrature discriminator and circuit

The integrated quadrature discriminator diagram is a TV soundtrack integrated circuit, which includes limiting intermediate amplifier (V1, V2; V4, V5; V7, V8 are three-stage differential pair amplifiers, V3, V6 and V9 are three emitters Follower), internal voltage regulator (VD1 ~ VD5, V10) and frequency discrimination circuit three parts.
In the above circuit, adjusting L, C, and C1 can change the loop resonance frequency, as long as it meets

Integrated quadrature discriminator circuit

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