Thread: 770 USB Host Mode - Knowledge base
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bhima is offline bhima
2006-01-12 , 19:57
Posts: 79 | Thanked: 1 time | Joined on Nov 2005
#40
Originally Posted by Simon
If I can I might put in a low current LED that switches off when my battery voltage drops too low. Maybe using a zener somehow? Tricky with NiMH since when considered flat they are still giving out about 1.1 volts I think?
I don't remember the exact numbers, but that's about right. The voltage of a battery is constantly lowering as you draw power from it.

When it's "dead" is not really an absolute, precise number. However, if you lower the voltage beyond a certain point, you will damage the battery...

I think your circuit ideas may be reasonable, but I'm not sure what is normally done. I'm planning to use a fancier DC/DC switched mode converter.

Originally Posted by Simon
I did the first year of the EE degree then changed to computer science. Much less maths!
When I started at Carnegie Mellon, the degree they offered was "Math/Computer Science." From what I've seen, CS at Carnegie Mellon actually involves more math than EE. It's a lot more symbolic, with a lot more discrete math and combinatorics. You see less numbers, but more math.