OA70 / IN34 / IN60 is Germanium Radio, choose only one type. Antenna high from Ground is high is possible, ground is a must to Steel Water pipe, or making one from a piece of copper approximately 1 meter down to the ground, so will be voltage between ground and radio wave pick up by antenna.
I have build this Radio and connected input speaker to line input notebook and running with Open Lab software and can pick up Radio Signal from about 6 km air distance.
====+ Parts List for +====
10 nF 1 Capacitor
VC 500 pF 1 Variable Capacitor
OA70/IN34/IN60 1 D
GND 1 GND
108 Turns,12 Turns L Tap between 108 Turns and 12 Turns
8-2000 Ohm 1 SPKR or Earphone 8 - 2000 Ohms
This is one of Product of Crystal Radio Kit with Mineral Gateway as Diode and without Battery, this crystal radio specification :
- Conduct a radio wave experiment
- Capture AM broadcasting radio waves
- Works without the need of a battery
- Science guide included (68 color pages)
- Another fun, educational product from the company that brings you Snap Circuits
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