How Li'lBoard designs are grouped...

There are 7 groups of designs. (The assignment of a design to a group is sometimes arbitrary in that some of the designs could be members of more than one group—it could be decided to change categories of some of them).

1. The power supply-related boards. Linear and switching regulators, power input and conditioning. All board models in this category start with a 2;
2. The analog boards. 555 timer, op-amps, audio amp, DDS and DACs. Model numbers are 3.xx;
3. The digital boards. Processors mostly but a few others such as an SPI port and a clock/square-wave generator. Go here to compare all the processor boards Model numbers are 4.xx;
4. The “peripheral” boards. This category is where you'll find the switches and lights. Mostly interfaces to the human Model numbers are 5.xx;
5. The “interface” boards. Interfaces with other electronics, so things like a USB peripheral, RS-232, RS-485 and LVDS transceivers. 6.xx model numbers;
6. Interconnection boards. These are all connectors of one sort or another, from a simple 4-way screw terminal to several types of USB connector;
7. The uncommitted boards. More like the traditional breadboarding style here. Model 8.xx numbers.

There are potentially other categories, such as one for rf functions. As well, when I started this I reserved the '1' prefix for things to do with packaging such as pre-drilled base boards. This has not proved to be a priority since it is so easy to drill out any old (or new) piece of perfboard and make your own.