Basic Crystal Radio Receiver Circuit Diagram A is a very simple radio receiver which needs no battery or power source and runs on the power received from radio waves by a long outdoor wire antenna. This schematic shows the Basic designed by Elmer G. Osterhoudt in the early ’30s. Capacitor C2 is used to match the antenna system, and C3 is the main tuning capacitor. Here is the details parts and components:

C1: 1000 pF mica or disc ceramic trimmer (Radio Shack 272-123)
C2: 40 to 500 pF trimmer capacitor (Antique Electronic Supply CV-263)
C3: 365 pF variable capacitor (Antique Electronic Supply CV-231)
D1: 1N34 germanium diode (Radio Shack 276-1123)
J1: 1/4-inch, 2-conductor headphone jack (Radio Shack 274-252)
L1: 35 feet of 22-gauge enamel wire. See text. (Radio Shack 278-1345)

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