HamGeek High Quality Green Crystal Radio Receiver Benny Circuit DIY Passive Medium Wave Radio Receiving

First, adjust each switch knob to:
- Selective regulation: dual circuit
- Band adjustment: medium wave
- Ampere meter range: 100uA
- Various diodes: 2AP9
- Various field tubes: 3DQ
- Diode field transistor: diode
- Output conversion: direct connection
- Input conversion: direct connection
- Benny Circuit: 9
- If there is a medium wave radio in the local area, outdoor antenna and ground wire, you can listen to it by plugging in high impedance headphones.

Package Included:
- 1 x Crystal Radio