FM stereo multiplex generator

  
The design philosophy for this circuit was centered on replacing all of the op-amp circuitry found in the earlier circuits with discrete transistors and LC filters. The previous circuits had many (high quality) op-amps in series, this resulted in audible distortion, especially on `ess` sounds. The discrete transistor amplification stages in this design produce an audio signal with much lower levels of distortion.
FM stereo multiplex generator - schematic

To make alignment of the stereo modulator easy, first build this Stereo Test Tone Generator, or generate equivalent waveforms with standard test equipment. The circuit produces a number of waveform combinations that are necessary for adjusting this circui



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