On p24, Fig 3 shows the labels of ZD1 and ZD2 transposed. The circuit diagram of Fig 2 is correct. In the following discussion, the labels of Fig 2 are used. "... Disconnecting ZD1 and R2/RV1/R3fora second, thavoltage atthe junction of C2, D1 and D2 would switch between +0.7V (the forward bias voltage of D2) and -8.4V (9.1 -0.7). Therefore, I would expect C3 to charge to -7.7V (-8.4V minus the 0.7V drop across D1).
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