For the network of Fig. 17.33, if C = 1 μF, find the level of R that will result in a 50% conduction period for the load in either direction if the turn-on voltage for the diac in either direction is 12 V and the applied sinusoidal signal has a peak value of 170 V (= 1.414 × 120 V) at 60 Hz.
FIG. 17.33 Application of a triac: phase (power) control.
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