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Impedance
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