Using a $6\mathrm{.}2-$V Zener diode and a $741$ op amp:

$1.$ Design a negative self$-$biased reference that accepts an unregulated voltage VI from

$715,$ and gives a regulated output VO adjustable from $3$ V to $6$ V by means

of a $10$ potentiometer.

a$.$ What are the permissible ranges for VI and IO$?$

b$.$ Simulate

i$.$ The line regulation

ii$.$ The load regulation from $0$ to $10$mA

$2.$ If you have a PNP BJT such as the $2$N$3906$ reconnect the circuit to increase the

maximum output current

a$.$ Simulate

i$.$ The line regulation

ii$.$ The load regulation from $0$ to $10$mA