>>> GENERATOR ASSEMBLY VCO DRIVER <<<

  The circuit shown below provides 12 volt power and the DC level (CV) needed to tune the GA5C, GA10C, GA1K, and GA2K through their full frequency range plus providing frequency modulation (Delta F).  The CV terminal of this circuit connects to the tuning terminal (V-T) of the VCO assembly.  Adjustment of R7 sets the center frequency (CF) of the VCO assembly, and the AC amplitude at the DV terminal determines how far the frequency will deviate (Delta F) around the center frequency (CF).

 

Figure 1, VCO Driver PC Board

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Figure 2, VCO Driver Circuit Diagram

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