Amplified Tunnel Diode Radio Receiver

SparkBangBuzz Website-homemade tunnel diodes

A Handy Signal Tracer You Can Make

A Carbon Audio Amplifier With No Tubes or Transistors

Printable Dial Scale and Retro Capacitor Labels for Decaling

Winding a Universal Wound Coil Without a Coil Winding Machine

Basic RF Probe Layout and Schematic for DIYers