R4 works with the 14 kΩ internal Vc bias to make a 5:1 voltage divider, converting 0 to 2 V into 1±0.2 V

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Other Materials from the Main Document

• Article «5 octave linear(ish)-in-pitch power VCO»
• Figure 1. A2 feedback and TDA7052A's antilog V_C gain control create a ~300-mW, 5-octave linear-in-pitch VCO. More or less…
• Figure 2. The signal at the A2+ (red) and A2- (green) inputs
• Figure 3. R4 works with the 14 kΩ internal Vc bias to make a 5:1 voltage divider, converting 0 to 2 V into 1±0.2 V
• Figure 4. V_C's 0 to 2 V antilog gain control span programs A1 pin 4 from 0.8 V to 1.2 V for 1x to 32x gain and F_OSC = 100 HzA1gain = 100 Hz(5.66Vc) = 100 to 3200 Hz