8 LED "breathing" flasher kit

This simple little kit uses an LM358 IC to make eight blue LEDs "breathe" - they ramp up and down rather than flashing on and off.

There is a trimpot on the board to adjust the breathing rate, from around 1.5 seconds per cycle to around 3 seconds per cycle. You could change this further if required by changing the trimpot and/or it's associated resistor to a different value.

Circuit diagram is included with the kit, and the PCB has the components clearly marked, so it's dead simple to build. Requires a 12V DC supply and draws around 40mA maximum.