Hello
I have a problem regarding this circuit , I don't know clearly how it works especially bolded part the quoted part of the book when says this "When the load current is greater than 600mA, the voltage across R4 is more than 0.6V, which turns on Q3. The collector current of Q3 flows through R3 and decreases the base voltage to Q2"
Thank you for your continuous help
SM
I have a problem regarding this circuit , I don't know clearly how it works especially bolded part the quoted part of the book when says this "When the load current is greater than 600mA, the voltage across R4 is more than 0.6V, which turns on Q3. The collector current of Q3 flows through R3 and decreases the base voltage to Q2"
Thank you for your continuous help
SM
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