> I want to build a simple circuit with a few LEDs and understand completely how it works and why it was designed that way. Once you get bored by "battery plus

> I want to build a simple circuit with a few LEDs and understand completely how it works and why it was designed that way. Once you get bored by "battery plus LED" circuits, I recommend Nibbler 4 bit CPU [1] and transistor clock [2]. They are sufficiently complex to be impressive and hone your EE skills, yet simple enough to still finish even if you're not really an EE. They also can be understood completely, there are no secrets and all design decisions are explained in the documentation. [1] http://bigmessowires.com/nibbler http://bigmessowires.com/nibbler [2] http://transistorclock.com http://transistorclock.com