Tagged Questions

3
votes
1answer
105 views

Safely extract power from USB

I am upgrading the lighting in a model with simple circuit which has 17 LEDs (approximately) plus one or two 555 timers. Presently, everything is powered by 3 AAA batteries. It drains between 150 and ...
0
votes
2answers
902 views

Driving many leds from 9V battery and USB wire

Hello I have 45 10mm Ultra Bright 7000mcd LED's with a Forward Voltage of 3.2 - 3.6 that have a Maximum Current of 20mA Max of 50mA peak for 10% Pulse Width. that came with 50 1/4W 100 ohm Resistor, ...
1
vote
4answers
278 views

Drive LEDs from USB

What do i need to make a USB device that has 4 LEDS that I can control from a PC software that I will build. I just need to make a software with 4 buttons (on/off) each button to control a single ...
1
vote
2answers
1k views

How do I make a 12 LED grid USB powered?

I want to make a grid of 12 LEDS which is powered by a USB cable... I know that the voltage is too high for one LED..the cpu stops the voltage after 2 sec. So what is the setup i need to use to do ...
2
votes
3answers
752 views

I want to remove 3 LED's from a small circuit board. Need a bit of help

I have a 4 port USB hub with 3 INCREDIBLY BRIGHT led lights on the circuit board I would prefer removed. I've googled a bit and found a user of this site actually describe the process very well.. ...
15
votes
10answers
3k views

I'd like to learn how to make my own USB gadgets

I've been writing Linux character device drivers for other people's stuff for some time. I'd like to find a new hobby and the thought of making my own USB gizmos seems really neat. I would be ...