Sometimes small LED is not enough and you like your buttons to be shining like a flash light. That's where LITBO comes handy. It plugs directly to LITSW socket, and now instead of mere 3mA, you can control whooping 500mA of current sink from power line going up to 25V. The pinout of the LITBO connector is the same as in LITSW, so you might use the same wiring with two exceptions. In default configuration LITSW drives LEDs with positive voltage and their cathodes need to be connected to GND. With LITBO plugged, the LEDs, bulbs, or motors should be connected to separate power rail (from 2 to 25V) capable of providing enough current if all outputs are on. The other difference is that there's no current limit this time, so when connecting standard LED directly to LITBO, the poor LED will burn out in smoke. If you connect very low impedance device, the LITBO will burn instead. So you have to provide proper circuitry (usually a resistor) to make sure the current cannot exceed 0.5A.
It is OK to go over 1A for a short time, like inrush current of a bulb being turned on.
This picture shows how LITBO should be inserted in LITSW - only one device shown for 8 buttons/lights. 3 are needed to have 24 high power outputs, but you can of course mix low and high power outputs on one LITSW. The blue screw terminal should be connected by the thickest possible wire to power ground, as it carries big current sink from all 8 outputs.
You should never, ever, at any time, disconnect power ground from LITBO, or unplug LITBO from LITSW while the power is on. This may cause LITBO to burn up in smoke. Every operation regarding LITBO must be performed while entire MIDI set is NOT powered.
Email for details