Bicycle Safety Light
Here's another design from Red Circuit Designs:
Flashing 13 LED unit, 3V supply
Also suitable for jogger/walkers
UV Sensitive Photodetector
A UV sensitive photodetector can be realized by using a Siemens
BPW34B with a standard transimpedance amplifier. The enclosed
schematic shows two different circuits. The circuit on the left is
a basic design which can b...
This circuit is an AC-powered current source designed for
recharging batteries. It can crank out as much as 1 amp and can be
modified to go even higher by choosing different devices for Q1.
Since this circuit uses AC line voltages...
Rugged LED Brake Lights
OK, here's a simple circuit that was by requested by a reader.
Normally, I don't like to run too many LED's in series because if
one dies, the whole string goes out. Finding the dead one can be
bit problematic as well. So...