This is a different application
Sorry for the misunderstanding.
I am going by the measurments that another member informed me of.
With no resistance only 2 of the 3 segments light up. At 61 ohms they all work and just to see I stuck another 82 ohms in series and they also all worked with no change in brightness. I think too much voltage saturates the sequencer circuit, but resisters are built in to the led circuit. The 3.5 amps is wrong. I had my meter on a/c. I checked it with the 61 ohms at 13.5v and read 13.125mA dc peak.
Using several different simulation programs
none seem to agree.
One site stated that with a 100ohm relay coil, a 2n2222 transistor,
6Vcc, hfe =100 using the output of a cmos ic
it stated that a 1800-2000 ohm base resistor to achieve saturation.
Tried same figures in **broken link removed**
using both simulations on that site.
Then input same into TINA and a different set of figures.
Am trying to understand how to caculate saturation. I think its when the collector voltage is near the emitter voltage (.7v or less) but the base needs to have a small amount of voltage (.7v) and control of the current to the base to achieve saturation.
formula I found is Rb = .2 X Rl x hfe
again sorry for the misunderstanding.