Here are some electronics projects I have built in recent years.

This is a simple, but high quality (discrete) preamp. I found the concept for this circuit on this Zetex data sheet, and then using pspice, optimised the component values and arrived at the circuit given here. This uses three cheap and widely available transistors as the basis for the design.

Discrete preamplifier

Still to come:

Headphone Amp

Power Amp

Non oversampling DAC