Test Equipment!

DIY Benchtop Audio Oscillator - This is a great piece of equipment to have on your workbench.

DIY Function Generator - Another useful benchtop tool to have. You can build one if you're crazy like me.

DIY Adjustable Voltage Power Supply - Great to have on your workbench.

EICO 625 Tube Tester - Some details on my classic tube tester.

Tektronix 453 Oscilloscope - A technical picture essay on a classic analog scope.

Two-Tone Audio Oscillator - An oscillator that produces a 1.1 kHz and 2.2 kHz audio tone.