Tag Archives: LED lights

Sound-activated LED lights using NPN transistor

What is wrong with the multi-colored LED light? Is it real? I have started experimenting with transistors. The amplified AC sound signal forked from the speaker (connected to the base) is enough to turn the transistor on.  The supply voltage … Continue reading

Posted in electronics | Tagged , | Leave a comment

Low-cost DIY portable emergency light using LED strips & 9-volt rechargeable batteries

The white LED strips operate at 12 volts. They will light up even at at 9 volts but will be less brighter. The multi-colored LEDs are not really an emergency lighting option but are good enough to help you find … Continue reading

Posted in electronics, how to | Tagged , | Leave a comment