My CMOS clock stopped keeping time. Whats up with that?
The CMOS clock is powered by the same battery that retains information like hard drive type, floppy drives installed, and so on. But it requires more power to run the clock than it takes to simply hold the information. So when the CMOS battery is close to dead, the clock will often stop running. It keeps time just fine while the machine’s on — because it’s not using the battery. And the CMOS data is retained just fine (for now!) because there’s just enough voltage to hold it up. Some motherboards want 6-volt backups for their CMOS, and some are happy with 3-volt batteries. If you put a brand new 3-volt battery in a motherboard which wants 6-volts, it often will act just the same as if the battery were dead. So make sure you replace with the proper type of battery. Home or [Index] What resistor should I use to make an LED work in my circuit? Use Ohms law to calculate the resistance and power needed: r = e / i If you don’t know how to use Ohms law, use our handy LED Calculator. Enter th
