MOTM

For anyone planning on getting into a little electronic tinkering, you
may be interested in a book I just picked up called "Build your Own Test
Equipment" by Carl J. Bergquist.

It's pretty neat. It walks you through building a full-featured yet
inexpensive powered prototyping station. Other projects are bench
supplies, signal generator, transistor tester, digital multimeter,
frequency counter, and more, and the book ends up with a project for a
dual-trace solid-state scope that uses an LED matrix for a 'screen.' (I
thought that last one might make a pretty cool module, but I doubt the
resolution would be high enough to be useful.)

All of the projects have pretty reasonable parts counts, yet appear to
be full-featured devices.