a question about transistors

[pese]

Hi Pese
If What I am understanding then. a TIP 120 would require less than 1 Volt  coming into the base to swicth. is that correct?
thanks
Bizzy

The TIP120 , also repacement circuits made with 2 transistors in darlington configuation.
have:
1.  current gain amplification of 10.000 and more
Vce  must be about 1,2 to 2,5Volt
(see datasheet for the related collector-currents.
Vce(sat) about 1Volt and more
(see datascheets.


With an serie resistor to drive the first bas , you can enlarge the driving voltage and
limiting the input currents   
to adapt to driving circuits
Pese

[Bizzy]

With an serie resistor to drive the first bas , you can enlarge the driving voltage and
limiting the input currents   
to adapt to driving circuits
Pese

Hi Pese
Could you post a schematic of a series resistor for the base?
Thanks
Bizzy