What are the minimum and maximum conduction angles of the SCR in Fig. 15-42? In

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What are the minimum and maximum conduction angles of the SCR in Fig. 15-42?

In Fig. 15-41, R is adjusted to 750 ohm. What is the charging time constant for the capacitor? What is the Thevenin resistance facing the gate? The resistor R2 in Fig. 15-42 is set to 4.6 kohm What are the approximate firing and conduction angles for this circuit? How much ac voltage is across C? Using Fig. 15-42, when adjusting R2, what are the minimum and maximum firing angle values? What are the minimum and maximum conduction angles of the SCR in Fig. 15-42? Calculate the supply voltage that triggers the crowbar of Fig. 15-43. If the zener diode of Fig. 15-43 has a tolerance of plusminus 10 percent and the trigger voltage can be as high as 1.5 V, what is the maximum supply voltage where crowbarring takes place? If the zener voltage in Fig. 15-43 is changed from 10 to 12 V, what is the voltage that triggers the SCR? The zener diode of Fig. 15-43 is replaced by a 1N759. What is the supply voltage that triggers the SCR crowbar?

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