Using optocouplers lighting circuit lights a delay

Circuit shown in Figure 2-48. Circle 2-48 (a) using 4.5V battery powered; Fig. 2-48 (b) AC capacitors drop voltage supply. Figure 2-48 (a) the delay time is determined by R3, R

P and C; Fig. 2-48 (b) the delay time from R4, RP decisions and Island.

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