xanadu vector
New Member
I built a pushbutton timer circuit to run a LED using a 556 IC. It runs the LED at 20ma for 8 minutes. When the LED is off the circuit draws 2ma. The entire thing runs on a 9v battery. All of the dry cell 9v batteries don't have a mah rating... Is there a way to figure out how long the 9v battery will last at a 2ma drain or what a batteries mah is? I mean without actually finding out by running it down...
And, does anyone know of a schematic I can use that will enable me to accomplish the same thing with less or no standby power?
Thanks!
And, does anyone know of a schematic I can use that will enable me to accomplish the same thing with less or no standby power?
Thanks!