This circuit was found in a 1994 publication. It can receive signals from the 3 to 20 MHz band, which are applied to the input of an audio amplifier. L1 has 18 turns of AWG 28 wire in a 10 cm long ferrite rod and taken at the eighth turn. L32 consists of 3 to 4 turns of the same wire next to L1. L2 consists of 10 turns of AWG 28 wire in a 10 cm long ferrite rod and L4 has 4 turns of the same wire next to L2.
| Clique na imagem para ampliar |
