Hi
I am trying to regulate a negative voltage from about -21V to about -19V using a darlington transistor as shown in the figure. The darlington pair has a Beta of about 15000, and therefore with a desired Ic = 55mA, I calculate an Ib=3.76uA.
Can anybody advise a procedure for determining sensible values for the resistors in the voltage divider network on the base?
Thanks in advance.
I am trying to regulate a negative voltage from about -21V to about -19V using a darlington transistor as shown in the figure. The darlington pair has a Beta of about 15000, and therefore with a desired Ic = 55mA, I calculate an Ib=3.76uA.
Can anybody advise a procedure for determining sensible values for the resistors in the voltage divider network on the base?
Thanks in advance.