Hi,
I've near zero knowledge of electronics. My question may be incorrect or very simple. But here it is
I need to reduce 5V 500ma (usb port output) to 3V 30ma.
I've a Bluetooth keyboard and it has some problem that it completely drains new pair of AAA batteries in about 2-3 hours (even if I'm not using the keyboard). In about 2-3 batteries are dead with some leakage from the battery terminals.
Keyboard power requirements: 3V 30mah ( 2 AAA batteries )
I'm trying to power the keyboard using the USB port of my computer. I cut off one end of a spare USB cable and tried to connect with the terminals in the battery compartment. +ve with +ve and -ve with -ve (just to be clear).
After connecting a battery indicator in the keyboard blinks rapidly and keyboard doesn't work.
What is required to reduce the input 5V 500ma to 3V 30ma. I tried using a resistor rated 560 ohm(figured the resistor rating after some googling and understanding color coding). But my multimeter show 5V with / without resistor being attached to +ve line (may be resistor is faulty).
I've a few old non working electronics. I can pull out components from them.
Can anyone suggest what resistor capacity will be required to achieve 3V 30ma ?
I've near zero knowledge of electronics. My question may be incorrect or very simple. But here it is
I need to reduce 5V 500ma (usb port output) to 3V 30ma.
I've a Bluetooth keyboard and it has some problem that it completely drains new pair of AAA batteries in about 2-3 hours (even if I'm not using the keyboard). In about 2-3 batteries are dead with some leakage from the battery terminals.
Keyboard power requirements: 3V 30mah ( 2 AAA batteries )
I'm trying to power the keyboard using the USB port of my computer. I cut off one end of a spare USB cable and tried to connect with the terminals in the battery compartment. +ve with +ve and -ve with -ve (just to be clear).
After connecting a battery indicator in the keyboard blinks rapidly and keyboard doesn't work.
What is required to reduce the input 5V 500ma to 3V 30ma. I tried using a resistor rated 560 ohm(figured the resistor rating after some googling and understanding color coding). But my multimeter show 5V with / without resistor being attached to +ve line (may be resistor is faulty).
I've a few old non working electronics. I can pull out components from them.
Can anyone suggest what resistor capacity will be required to achieve 3V 30ma ?